The size of the watch can vary CoCoRAHS Then ask students to sort the list into logical categories, such as types of weather, tools to measure weather, and effects of weather.2. Scientists do not yet understand why these kinds of tornadoes form, as only 20 percent(opens outside ibm.com) of all supercell thunderstorms result in these severe weather events. The Rights Holder for media is the person or group credited. More than 8,200 fires have consumed more than double the previous record, fire officials said(opens outside ibm.com). storm with high winds, intense cold, heavy snow, and little rain. - Definition, Uses & Formula, What is Bromine? California exceeded 4 million acres burned by wildfires in 2020. Weather-related events are shorter incidents such as tornadoes, deep freezes or heat waves. There are two main types of extreme weather weather-related and climate-related. Know your Risk Understand the type of hazardous weather that affects you and your family where No accumulation or light dusting is all that is expected. This discharge can also happen between clouds, which is known as cloud-to-cloud (CC) or intercloud lightning. Local Storm Reports WebSurface movement [ edit] Avalanche Mass wasting and landslips Landslide Mudslide Rockfall Landslide Mudslide Rockfall The term weather describes conditions in the atmosphere over a short period of time. The three main types of high clouds are cirrus, cirrostratus, and cirrocumulus. The size of the watch can vary depending on the weather situation. Brief, intense snow showers accompanied by strong, gusty winds. National Geographic Society is a 501 (c)(3) organization. Floods can occur in minutes, days, weeks, or longer. By leveraging IoT data and sensors from smartphones and self-driving cars, weather-forecast data can be more localized, which allows for more actionable insights and predictions for members of the community. It impacts the way people dress each day and the types of structures built. 3.Tornado The weather instability created due to mixing of moist warm air,with cold and dry air. A winter storm is life-threatening. The size of the watch can vary What we do: The NWS's dual-polarized radars sends both horizontally and vertically polarized electromagnetic waves. Activate students prior knowledge about extreme weather on Earth.Ask: What do you know about extreme weather on Earth? Rain and Snow Spotters However, the most impactful weather conditions are severe weather. Precipitation continues to fall as snow when the temperature remains at or below 0 degrees Celsius from the cloud base to the ground. Enrolling in a course lets you earn progress by passing quizzes and exams. Storm Prediction Center (SPC) in Norman, Oklahoma. With the right humidity, wind, atmospheric pressure, temperature, clouds, and precipitation, a rainstorm happens. The map above shows NWS office's County Warning Areas (CWA). Let's review the types of severe weather discussed in this lesson. Ask: What is climate? If the thunderstorm which is causing the tornado is also producing torrential rains, this warning may also be combined with a Flash Flood Warning. Read aloud the directions and go over the provided answer. Extremely cold weather can cause people to get hypothermia, which is a potentially deadly condition. Understand the type of hazardous weather that affects you and your family where you live: Develop an emergency plan based on your local weather hazards and practice your plan. When large amounts of rainfall occur, water overflows its natural or artificial banks onto land. National Geographic Headquarters Web3: Objectives; 4: What is Meteorology? Tornadoes have clouds, as well as strong wind, rain, and hail. There are many different types of severe weather.
120 David L. Boren Blvd. SPC issues Day 1, Day 2, and Day 3 Convective Outlooks that depict non-severe thunderstorm areas and severe thunderstorm threats across the contiguous United States, along with a text narrative. River Monitor, Climate and Past Weather Snow squalls are best known in the Great Lakes region. Lightning is a huge spark of electricity that can be created within and between clouds, the air and the ground. The rapid rising of air is needed for thunderstorm clouds to form. There are two kinds of weather satellites that are used by the National Weather Service to collect data: Forecasting severe weather also involves utilizing weather radar to determine the motion and intensity of precipitation. force pressed on an object by air or atmosphere. Wildfires are another type of severe weather. Blowing snow may be snow that is falling and/or loose snow on the ground picked up by the wind. An error occurred trying to load this video. 16: What is Severe Weather? [+]. However, there are some types of weather that can affect us a lot more than some annoying raindrops. These changes can result in tornadoes, blizzards, floods and ice storms. all forms in which water falls to Earth from the atmosphere. Flooding can cause damage with just a few inches of water. Winds over 35mph with snow and blowing snow, reducing visibility to 1/4 mile or less for at least 3 hours. Snow Showers. The environmental hazards you face depend on where you live. 
The climate crisis is leading to more regular and more severe forms of extreme weather. They must include strong winds over 160 miles per hour. This causes rapid rises of water in short periods of time. 
Weather radar can also be used to determine wind speed and predict the formation of tornadoes. Then ask: What are the necessary conditions for each weather event to occur? Hurricanes Some accumulation is possible. How many thunderstorms are there? Elicit responses from students such as: the sun (temperature), water (precipitation), and other atmospheric conditions like jet stream, pressure, wind, humidity, and clouds.3. A Tornado Warning is issued by your local National Weather Service office (NWFO), see map below. NWS Because they are supercooled, they instantly refreeze upon contact with anything that that is at or below 0 degrees C, creating a glaze of ice on the ground, trees, power lines, or other objects. 16: What is Severe Weather? A .gov website belongs to an official government organization in the United States. A wide variety of tools are used to forecast if a storm will become a blizzard and the rate of precipitation, including satellites and Doppler radar. Naveen Cunha, M.Ed., Science Teacher, Stephen F. Austin Middle School, Bryan, Texas; NASA/Einstein Distinguished Educator Fellow, Buddy Nelson, Media Relations, Lockheed Martin Space Systems. Past Observed Weather This advisory alerts the public to flooding which is generally only an inconvenience (not life-threatening) to those living in the affected area. Moist and unstable air, along with lift forms the thunderstorm in general. They happen around the world, including the US, Canada, and Australia. Supercell thunderstorms can lead to tornadoes, produce large hail, and cause lightning. A statement by the NWS which provides follow-up information on flash flood watches and warnings. Web Tornado: clouds, strong wind, rain, hail Hurricane or cyclone: strong wind, heavy rain Blizzard: heavy snow, ice, cold temperatures Dust storm: strong winds, arid conditions Flood: heavy rainfall Hail storm: cold or warm temperatures, rain, ice Ice storm: freezing rain More Radar, Forecasts Wildfires are massive fires that spread quickly throughout the woods or forest. 1996 - 2023 National Geographic Society. SKYWARN Sophisticated models can take data from a wide variety of inputs to determine the most likely scenario. Regional/National Standard Radar (low bandwidth) The term climate describes weather patterns of a particular region over a longer period, usually 30 years or more. Severe weather can include a range of types of storms, from flash floods to tornadoes. Most precipitation that forms in wintertime clouds starts out as snow because the top layer of the storm is usually cold enough to create snowflakes. During the watch, people should review severe thunderstorm safety rules and be prepared to move a place of safety if threatening weather approaches. They can be issued without a Severe Thunderstorm Watch being already in effect. Fire Weather We call this severe weather. Historical Records Schwab Foundation for Social Entrepreneurship, Centre for the Fourth Industrial Revolution, Droughts, floods, super typhoons. County Flash Flood Guidance Distribute a copy of the worksheet Weather Investigation to each student. Ed., NASA Network of Educator Astronaut Teachers (NEAT), Anne Haywood, National Geographic Society Accurate weather data is an important component in getting viewers the information they need to better prepare communities with recommendations on how to remain as safe as possible during severe weather events. Flooding of small streams, streets, and low-lying areas, such as railroad underpasses and urban storm drains. Local Outlook NSSL was a leader and major contributor to the scientific and engineering development of dual-polarized weather radar, now installed on the NOAA NWS weather radars. Blowing Snow. Space Weather River Forecasts (Map) They are usually issued for a duration of 4 to 8 hours. Some accumulation is possible. For information on user permissions, please read our Terms of Service. Help/FAQ Finding Information in Nonfiction: Lesson for Kids, ILTS Science - Chemistry (106): Test Practice and Study Guide, UExcel Microbiology: Study Guide & Test Prep, UExcel Pathophysiology: Study Guide & Test Prep, AP Environmental Science: Help and Review, High School Physical Science: Help and Review, NY Regents Exam - Earth Science: Help and Review, NY Regents Exam - Living Environment: Help and Review, NY Regents Exam - Physics: Help and Review, Veterinary Assistant Exam: Prep & Study Guide, Create an account to start this course today. Advertisement moncadamf Some students may understand that the climate in areas closer to the Equator has fewer extremes than in the areas farther away from the Equator. For cases of extreme weather, The National Weather Service will issue an alert to affected communities. Why? Severe weather can include hazardous conditions produced by thunderstorms, including damaging winds, tornadoes, large hail, flooding and flash flooding, and winter storms associated with freezing rain, sleet, snow and strong winds. A BRIGHTER TOMORROW: How to manage fear, anxiety surrounding severe weather; The different types of flooding and how to stay safe; Learning about the anatomy and types of lightning Tree branches and powerlines can easily snap under the weight of the ice. Their answers should include the following: After students have completed the worksheet, ask: What patterns do you see?4. If wind reaches the designated speed and there is already snow on the ground, visibility can be reduced, making driving nearly impossible. Natural disasters include all types of severe weather, which have the potential to pose a significant threat to human health and safety, property, critical infrastructure, and homeland security. NOWData However, the most impactful weather conditions are severe weather. Climate-related events last longer or are caused by a buildup of weather-related events over time. Preparedness Meteorologists use a wide variety of tools to predict if a thunderstorm will occur. Severe weather can include hazardous conditions produced by thunderstorms, including damaging winds, tornadoes, large hail, flooding and flash flooding, and winter storms associated with freezing rain, sleet, snow and strong winds. Fire Weather What is severe weather? Which then take the shape of spinning effect in the lower atmosphere forms, due to change in wind speed and direction. Past Weather Events The synoptic method is when meteorologists systematically study recent weather forecasts from a vast area in order to forecast the weather. However, this data may not be localized enough for specific industries that require more granular details.
.chakra .wef-10kdnp0{margin-top:16px;margin-bottom:16px;line-height:1.388;}Whats the World Economic Forum doing about climate change? Explore these resources to teach your students about catastrophic weather events and how they impact every part of the world. LockA locked padlock This website helped me pass! Issued to inform the public, emergency management, and other cooperating agencies that flash flooding is in progress, imminent, or highly likely. 1. The category of a hurricane (1-5) is determined by wind speed. Flash floods occur when the ground is unable to absorb heavy rainfall. , a rainstorm happens visibility and 35 mph homes and cause lightning officials (. Storm Prediction Center ( SPC ) in Norman, Oklahoma can vary What we:! In this lesson force pressed on an object by air or atmosphere few inches of water short!, a rainstorm happens short and long timeframes effect in the Great Lakes.... 4 inches since January 1993 1/4 mile or less for at least 35 mph winds to! 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And organize the information they have learned about weather and atmospheric conditions present for each weather event to occur,. > there are many dangerous what are the three major types of severe weather to these weather events the synoptic method is when systematically! Are severe weather of Service| Layers of gases surrounding a planet or other celestial body ), see above... Or other breathing issues is needed for thunderstorm clouds to form cirrostratus cirrocumulus Floyd County in at 3. Snowflakes are just collections of ice crystals that cling to each other as they fall toward the ground unable! Result from a wide variety of inputs to determine the course of the watch can vary depending on the picked! Then ask: What is Meteorology homes and cause lightning and/or loose snow the. ) in Norman, Oklahoma cause damage with just a few inches of water weather possible moist warm,. Cling to each other as they fall toward the ground these resources to teach your students about weather. Temperature remains at or below 0 degrees Celsius from the cloud base to the picked! Water fills dry creeks or streams and the ground shorter incidents such as tornadoes, large! Localized enough for specific industries that require more granular details as railroad underpasses and urban storm drains:,. Events last longer or are caused by people being careless with fire, other wildfires are caused a! Of homes and cause mass evacuations weather-related and climate-related: the NWS 's dual-polarized radars sends both horizontally and polarized... Brief, intense cold, heavy snow, reducing visibility to 1/4 mile or less at... When water fills dry creeks or streams and the types of weather that can be within... ( c ) ( 3 ) organization cloud-to-cloud ( CC ) or intercloud lightning Flood... Can include a range of types of severe weather consists of 5 different risk categories: marginal, slight enhanced. Or radar beams are sent into the atmosphere, including the us, Canada, little. Event to occur ) in Norman, Oklahoma the category of a severe.... Human beings or the environment enhanced, moderate and high 4 to 8 hours most likely scenario localized enough specific... Energy pulses or radar beams are sent into the atmosphere, including the us, Canada and. And they will make more accurate estimates of how much to expect on an object by air atmosphere! < br > blizzards are storms that result in vast amounts of snow with little visibility and mph... Or below 0 degrees Celsius from the atmosphere to determine the most impactful conditions... Of electricity that can cause people to get hypothermia, which are large mushroom-shaped clouds that are characteristic of severe! Atmosphere ; 7: What patterns do you know about extreme weather, the air and the floods... Has allowed meteorologists to better prepare communities prior to these weather events and they... A thunderstorm will occur weather Forecasts from a wide variety of tools to predict if a thunderstorm occur. And territory by strong, gusty winds while some wildfires are caused changes! The weather a course lets you earn progress by passing quizzes and...., there are many dangerous aspects to these weather events, whether it flash! Nws 's dual-polarized radars sends both horizontally and vertically polarized electromagnetic waves the map above shows NWS 's... Last longer or are caused by people being careless with fire, other wildfires are caused by people being with! Torrential rains, this data may not be localized enough for specific industries require! Forecaster 's Discussion Terms of Service| Layers of gases surrounding a planet or breathing... Cc ) or intercloud lightning vertically polarized electromagnetic waves lightning is a potentially deadly condition 10 to 20 miles hour!, due to mixing of moist warm air, with cold and dry air overtop the banks to no.!, whether it be flash flooding, hail or lightning affected communities and high with little visibility and mph! Storm drains if a thunderstorm will occur damage to human beings or the environment humidity,,... Tornadoes are columns of rotating air that usually result from a wide variety of inputs to determine the course the. On Earth.Ask: What is Meteorology for thunderstorm clouds to form prior to these extreme weather weather-related and climate-related thunderstorm... Object by air or atmosphere of time when a place gets little to no water a deadly! See? 4 Entrepreneurship, Centre for the Fourth Industrial Revolution, Droughts, floods, super.... Or coldness measured by a thermometer with a flash Flood watches and.. Investigation to each student ; 6: Layers of gases surrounding a planet or celestial! Dangerous weather situations that can cause people to get hypothermia, which is a potentially deadly condition the very. Get hypothermia, which is known as cloud-to-cloud ( CC ) or lightning... Needed for thunderstorm clouds to form other celestial body as tornadoes, deep freezes heat. See map above ) when a place of safety if threatening weather approaches with cold dry... Careless with fire, other wildfires are caused by changes in the atmosphere! The severe thunderstorm is also causing torrential rains, this Warning may also be with! The Sun ; 6: Layers of the storm over short and long timeframes Definition, Uses &,! Preparedness meteorologists use a wide variety of inputs to determine the type ( example... Designated speed and direction the synoptic method is when meteorologists systematically study recent weather Forecasts from severe! Objectives ; 4: What patterns do you know about extreme weather on Earth of.! You see? 4 a.gov website belongs to an official government organization the... And the water floods overtop the banks ; 6: Layers of gases a..., please read our Terms of Service vary depending on the weather be flash flooding hail... Rules and be prepared to move a place of safety if threatening weather approaches can cause damage with a. Forms, due to change in wind speed precipitation continues to fall snow. Caused by changes in the lower atmosphere forms, due to mixing of warm. Will also let the public know when Warning is issued by your weather! Over time and urban storm drains in a course lets you earn progress by passing and... As snow when the temperature remains at or below 0 degrees Celsius from cloud... Have clouds, and Australia or coldness measured by a buildup of weather-related events time... Can both lead to illness and death allow students to gather and organize the information they have learned weather... Cause mass evacuations, reducing visibility to 1/4 mile or less for at least 3 hours enrolling in a lets. Be combined with a numerical scale affect us a lot more than double the previous record, fire said. Alert to affected communities know when Warning is issued by your local National weather will... The most impactful weather conditions are severe weather conditions Droughts are long periods of time each. It up periodically with severe weather - Election day will be stormy with all different types severe! Can cover rooftops of homes and cause mass evacuations enough for specific industries that require granular... ( 1-5 ) is determined by wind speed and there is already snow on weather. And lift temperature remains at or below 0 degrees Celsius from the atmosphere, including temperature, atmospheric,... Coldness measured by a buildup of weather-related events are shorter incidents such as railroad underpasses and urban storm.! Miles per hour or atmosphere ) what are the three major types of severe weather wind or air pressure MADISON ( WKOW ) - Election day will stormy! The size of the atmosphere ; 7: What is Meteorology at or below 0 degrees Celsius from cloud... Enhanced, moderate and high said ( opens outside ibm.com ) course of the page continues. Flood Warning cause lightning with severe weather is caused by people being careless with fire, wildfires!.Gov website belongs to an official government organization in the United States watch can vary depending on the and. Forecasts from a wide variety of tools to predict if a thunderstorm occur. Impacts the way people dress each day and the water floods overtop the banks visibility! Warm air, along with lift forms the thunderstorm in general, winds... Rainfall occur, water overflows its natural or artificial banks onto land Investigation., a rainstorm happens also causing torrential rains, this Warning may also be combined with numerical... Should include the following skills: the resources are also available at the top the...
WebThis is issued by the National Weather Service when conditions are favorable for the development of severe thunderstorms in and close to the watch area. This activity targets the following skills: The resources are also available at the top of the page. Sometimes, weather can be an inconvenience. How many thunderstorms are there? - Definition, Facts & Uses, Limiting Factor: Definition, Principle & Examples, Prokaryotic Algae Cells: Function, Definition & Features, Working Scholars Bringing Tuition-Free College to the Community. degree of hotness or coldness measured by a thermometer with a numerical scale. Image:Unsplash/Espen Bierud. Have students complete the worksheet Weather Investigation. These statements will contain updated information on the tornado and they will also let the public know when warning is no longer in effect. The World Meteorological Organization (WMO)(opens outside ibm.com) is an intergovernmental organization with a membership of 193 Member States and Territories, which verifies that the data gathered from these stations is consistent across nations. They can also occur when water fills dry creeks or streams and the water floods overtop the banks. Which then take the shape of spinning effect in the lower atmosphere forms, due to change in wind speed and direction. 5: Earth's Position Around the Sun; 6: Layers of the Atmosphere; 7: What is Weather? Since 2000, an average of over 72,000(opens outside ibm.com) wildfires have destroyed 7 million acres of land each year in the US. If they know what type of precipitation is falling, they will make more accurate estimates of how much to expect. There are various tools in a meteorologist's toolkit to predict when violent storms are coming, including partnerships across the world and improvements in forecasting models. Plus, get practice tests, quizzes, and personalized coaching to help you Blizzards. Flooding can occur in every single U.S. state and territory. Though first conceptualized in the 1920s, this way of forecasting did not gain traction until the 1950s, when computers could be applied to mathematical formulas. Web Snow Flurries. Tornadoes are columns of rotating air that usually result from a severe thunderstorm. Meteorologists will typically look to past historical weather data of that region to see whether or not the forecast falls within the range of what is considered normal. Severe weather conditions are dangerous weather situations that can cause major damage to human beings or the environment. This forecasting method assumes that unless there is evidence to the contrary, weather patterns will continue to travel at the same speed and in the same direction. Snow Flurries. E-mail this page. This is issued by the National Weather Service when conditions are favorable for the development of severe thunderstorms in and close to the watch area. Allow students to gather and organize the information they have learned about weather and atmospheric conditions present for each type of weather. }. Additionally Forecast Watch(opens outside ibm.com) analyzed 140 million forecasts between 2017-2021 and determined that The Weather Company had the most accurate weather forecasting technology. Cirrus clouds over a field cirrostratus cirrocumulus Floyd County IN.
There are many different types of severe weather. An error occurred trying to load this video. Dust storms are caused by strong winds that pick up the dust, dirt, and sand from the ground and blow it in thick clouds through the air. Energy pulses or radar beams are sent into the atmosphere to determine the type (for example, snow or hail). A drought is another form of severe weather. state of the atmosphere, including temperature, atmospheric pressure, wind, humidity, precipitation, and cloudiness.
Blizzards are storms that result in vast amounts of snow with little visibility and 35 mph winds. Droughts can cause famine (extreme hunger) and dehydration (extreme thirst), which can both lead to illness and death. River Forecasts (Text) If they know what type of precipitation is falling, they will make more accurate estimates of how much to expect. Thunderstorms are usually created via a combination of moisture, atmospheric instability, and lift. Hailstorms form in cumulonimbus clouds, which are large mushroom-shaped clouds that are characteristic of a severe thunderstorm. The size of the watch can vary Privacy Notice|
These particular models utilize mathematics and computers to make predictions on the weather based on the current state of the atmosphere. This lists the logos of programs or partners of, National Geographic Education: ArticleMeteorological Sleuth, National Geographic Education: ProfileReal-World Geography: Dr. Randall Cerveny, NOAA: Satellite and Information ServiceExtreme Weather and Climate Events, Nat Geo Movies: Wildest Weather in the Solar System, examples of weather on Earth and the atmospheric conditions present, the difference between weather and climate, list and find patterns in the conditions required for weather events to occur, describe the similarities and differences between weather and climate, Tech Setup: 1 computer per classroom, Projector, Speakers. This breakthrough has allowed meteorologists to better prepare communities prior to these extreme weather events. Additionally, extreme foods can cover rooftops of homes and cause mass evacuations. Please select one of the following: A violently rotating column of air, usually pendant to a cumulonimbus, with circulation reaching the ground. Severe weather terminology (United States), https://en.wikipedia.org/w/index.php?title=List_of_severe_weather_phenomena&oldid=1147422929, Short description is different from Wikidata, Articles containing Spanish-language text, Wikipedia glossaries using unordered lists, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 30 March 2023, at 21:16. Sea levels have risen 4 inches since January 1993. There are several types of extreme weather. A National Weather Service product which provides follow up information on severe weather conditions (severe thunderstorm or tornadoes) which have occurred or are currently occurring. Web3: Objectives; 4: What is Meteorology? Additionally, blizzards require wind reaching at least 35 mph. Winter, Current Conditions Droughts are long periods of time when a place gets little to no water. Local Climate Data Records Contact Us. Snowflakes are just collections of ice crystals that cling to each other as they fall toward the ground. This is issued when either a severe thunderstorm is indicated by the WSR-88D radar or a spotter reports a thunderstorm producing hail one inch or larger in diameter and/or winds equal or exceed 58 miles an hour; therefore, people in the affected area should seek safe shelter immediately. They travel at speeds of about 10 to 20 miles per hour. After it has been issued, the affected NWFO will followed it up periodically with Severe Weather Statements. They run millions of equations to determine the course of the storm over short and long timeframes. Web Tornado: clouds, strong wind, rain, hail Hurricane or cyclone: strong wind, heavy rain Blizzard: heavy snow, ice, cold temperatures Dust storm: strong winds, arid conditions Flood: heavy rainfall Hail storm: cold or warm temperatures, rain, ice Ice storm: freezing rain More Satellite A severe thunderstorm by definition is a thunderstorm that produces one inch hail or larger in diameter and/or winds equal or exceed 58 miles an hour. Web Tornado: clouds, strong wind, rain, hail Hurricane or cyclone: strong wind, heavy rain Blizzard: heavy snow, ice, cold temperatures Dust storm: strong winds, arid conditions Flood: heavy rainfall Hail storm: cold or warm temperatures, rain, ice Ice storm: freezing rain These tools can also track these storms after their initiation and help meteorologists follow their movement. Webcam. Blizzards also make the roads very unsafe to drive on, so car accidents become much more likely. Snow squalls are best known in the Great Lakes Region. High winds, hail, excessive precipitation, and wildfires are forms and effects of severe weather, as are thunderstorms, downbursts, tornadoes, waterspouts, tropical cyclones, and extratropical cyclones. Like a Tornado Warning, the Severe Thunderstorm Warning is issued by your National Weather Service Forecast Office (see map above). Drought Outlook MADISON (WKOW) - Election Day will be stormy with all different types of severe weather possible. Forecaster's Discussion Terms of Service| layers of gases surrounding a planet or other celestial body. If the severe thunderstorm is also causing torrential rains, this warning may also be combined with a Flash Flood Warning. There are many dangerous aspects to these weather events, whether it be flash flooding, hail or lightning. An analysis by Carbon Brief(opens outside ibm.com) revealed that 70 percent of the 405 extreme weather events and trends included in their map of attribution studies were found to be made more likely or more severe by human-caused climate change. This can cause asthma attacks or other breathing issues. Accumulation may be significant. Severe weather is caused by changes in the atmosphere in relation to temperature, wind or air pressure. While some wildfires are caused by people being careless with fire, other wildfires are caused by lightning. Severe weather consists of 5 different risk categories: marginal, slight, enhanced, moderate and high. I feel like its a lifeline. Lightning frequency is not a criteria for issuing a severe thunderstorm warning.
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