The thunderstorm forecast is issued daily from March 1 to September 30.

Wednesday, July 28th:

Isolated-severe thunderstorms are expected in numerous areas of the U.S. today. Due to an area of low pressure in these regions of the country, the storms will be in an area with enough instability to create supercells, and potentially an isolated Tornado. Large hail, isolated heavy downpours, and damaging wind gusts are likely with these thunderstorms.​

Non-severe thunderstorms are also expected today throughout parts of the country. Small hail, wind gusts up to 55 mph, and isolated flooding may occur with these storms.

To learn more about the terms used in the thunderstorm outlook, visit our glossary.


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In the United States, there are two types of severe thunderstorm alerts. Severe thunderstorm watches and severe thunderstorm warnings.

A watch is issued when: 50% confidence of meeting Warning criteria (generally within 36-48+ hours).

A warning is issued when: thunderstorms with wind gusts ≥ 58 mph (50 kts) and/or hail ≥ 1-inch in diameter and/or a tornado are imminent or occurring.