Thunderstorms are a familiar occurrence in Alabama. Birmingham averages 57 thunderstorm days a year. Mobile averages 79 thunderstorm days. Many people find storms to be interesting, and even thrilling, but they are dangerous events that deserve respect.
By definition, thunderstorms contain lightning: the underrated killer. Thunderstorms also produce damaging winds, hail, flooding and tornadoes. For a storm to be considered “severe,” it must contain at least one of the following criteria:
• Wind gusts of 58 mph or greater.
• Hail of 1 inch in diameter or greater.
• A tornado (which upgrades to a tornado warning).
Although lightning can be deadly, the National Weather Service doesn’t use it to define a severe thunderstorm. If it did, every thunderstorm would be severe, by definition. Although excessive rainfall may lead to deadly flash flooding, heavy rain is not considered severe. Flood threats are handled through a separate set of watches and warnings from the National Weather Service.
One event that can cause damage and injuries during severe thunderstorms is straight-line winds. Damaging winds occur much more frequently than tornadoes and can cause just as much damage with speeds that can exceed 100 mph. Trees and power lines can be knocked down, mobile homes overturned, and well-built homes and buildings damaged.
Another thing that can cause damage and injuries during severe thunderstorms is hail. Hail is most common in the spring in Alabama, when atmospheric conditions make it most likely the ice can reach the ground. Hail can cause severe damage to automobiles and buildings by damaging roofs and windows. Hail injuries are rare but do happen. Hail can cause death, as happened on March 28, 2000, when a man in Fort Worth, Texas, was struck by a baseball-sized hailstone. There have been five recorded hail fatalities in U.S. history. So while it is not a frequent killer, it can be deadly. To be safe, don’t get caught outside in a thunderstorm.
Tornadoes are another event that can happen during severe thunderstorms. We’ll cover tornadoes in our severe weather awareness story on Wednesday.
The primary safety rule for dealing with thunderstorms is to be in a well-built structure, away from windows. This will protect you from hail and non-tornadic winds. If you are caught outside, find shelter immediately.
On Tuesday, we take a look at flooding and flash flooding.
Look for posts on different severe weather issues each day through Saturday. Read a general post on Severe Weather Awareness Week, including information about safety, daily topics and Alabama’s severe weather sales tax holiday. For more weather news and information from James Spann, Scott Martin and other members of the James Spann team, visit AlabamaWx.
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February 23, 2021 at 05:10AM
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Severe Weather Awareness Week 2021: Severe thunderstorms - Alabama NewsCenter
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