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Extreme heat is a period of high heat and humidity with temperatures above 90 degrees for at least two to three days.
An overflow of water onto normally dry land. Flooding is a longer-term event than flash flooding: it may last days or weeks.
A rain-bearing cloud that also produces lightning.
A violently rotating column of air touching the ground, usually attached to the base of a thunderstorm.
A winter weather event is a winter weather phenomenon (such as snow, sleet, ice, wind chill) that impacts public safety, transportation, and/or commerce.