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Important Terms for Spring Severe Weather.
Severe Thunderstorm - A thunderstorm that produces a tornado, winds of at least 58 mph (50 knots), and/or hail at least ¾" in diameter. Structural wind damage may imply the occurrence of a severe thunderstorm. A thunderstorm wind equal to or greater than 40 mph (35 knots) and/or hail of at least ½" is defined as approaching severe.
Flash Flood - A flood which is caused by heavy or excessive rainfall in a short period of time, generally less than 6 hours. Also, at times a dam failure can cause a flash flood, depending on the type of dam and time period during which the break occurs.
Tornado Watch - Tornadoes are possible in your area. Remain alert for approaching storms. Listen to the media for updates.
Severe Thunderstorm Watch - Tells you there is a possibility of severe thunderstorms in your area likely to occur. Watch the sky and stay tuned to know when warnings are issued.
Flash Flood Watch – Flash flooding is possible in and close to the watch area, but the occurrence is neither certain or imminent. Listen to the National Weather Service, radio or television for information.
Tornado Warning - A tornado has been sighted or indicated by weather radar. Take shelter immediately.
Severe Thunderstorm Warning - A severe thunderstorm is occurring or will likely occur soon in your area. Warnings are for imminent danger to life and property to those in the path of the storm. Seek shelter immediately.
Flash Flood Warning - Flash flooding is in progress, imminent, or highly likely. Seek higher ground immediately or evacuate if directed to do so.
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