Severe Thunderstorms
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Thunderstorms are the most common summer storm in Stearns County, occurring primarily in the months of May through August. Thunderstorms are always accompanied by lightning, and often have strong wind gusts and heavy rain. They can generate hail and tornadoes.
Lightning may pose the greatest threat due to its frequency and damage caused. Since 1959, nearly sixty Minnesotans have died as a result of lightning, and many more have been seriously injured.
Thunderstorms can also be classified as windstorms when they produce wind gusts in excess of 58 miles per hour. Winds up to 130 mph have been reported in the strongest thunderstorms. Downbursts and straight-line winds can cause major structural and tree damage across a large area.
Hail is precipitation in the form of balls or clumps of ice. Hail storms occur when freezing water in storm clouds accumulates in layers around an icy core. Wind and hail can batter crops, structures and transportation systems. In Minnesota, most hail is not large enough to cause significant crop or property damage.
Preparedness
What to do before a severe storm
- Check the weather forecast when planning outdoor activities. Be alert for signs of thunderstorms (thunderhead clouds, dark skies, lightning, increasing wind) when you are outside.
- Designate a safe area in your home to shelter your family, such as the basement or an internal room with no windows. If you live in an apartment building, review safe areas with your building manager. If you live in a mobile home, make sure it is anchored to the ground or foundation, and know the locations of safe shelters.
Response
What to do during a severe storm
- If you are unsure whether you should seek shelter, use the "30-30" rule. When you see lightning, count the time until you hear thunder. If that time is 30 seconds or less, the thunderstorm is within 6 miles of you and is dangerous. Seek shelter immediately. Wait at least 30 minutes after the last clap of thunder before leaving shelter.
- During severe storms, it's best to get inside a designated storm shelter or large building. Do not stay in a mobile home.
- If you are caught outside, get away from open water, anything metallic and natural lightning rods like isolated tall trees.
- If a person has been struck by lightning, call 911. The person will not carry an electric charge; it is safe to administer CPR and first aid.
Recovery
What to do after a severe storm
- If your property has been damaged, contact your insurance agent as soon as possible.
For More Information:
National Weather Service - Lightning Safety
Severe Weather Awareness