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A severe weather outbreak is typically considered to be when ten or more tornadoes, some of which will likely be long-tracked and violent, and many large hail or damaging wind reports occur within one or more consecutive days. Severity is also dependent on the size of the geographic area affected, whether it covers hundreds or thousands of ...
Severe weather can occur under a variety of situations, but three characteristics are generally needed: a temperature or moisture boundary, moisture, and (in the event of severe, precipitation-based events) instability in the atmosphere.
A high risk severe weather event is the greatest threat level issued by the Storm Prediction Center (SPC) for convective weather events in the United States. On the scale from one to five, a high risk is a level five; thus, high risks are issued only when forecasters at the SPC are confident of a major severe weather outbreak.
Even beyond the weekend, the threat of severe weather will persist, but it will shift as a heat dome builds into the Central states, likely bringing the hottest air of the season thus far. Long ...
AccuWeather meteorologists believe that more rounds of severe weather will affect the Central states in the coming days. The weather pattern has been ripe for large complexes of thunderstorms to ...
April and May are the most active months for tornadoes and severe weather, and that reputation continued Thursday, when more than 60 million people in the South and East were at risk of severe ...
The categorical forecast in the Day 1-3 Convective Outlooks—which estimates a severe weather event occurring within 25 miles (40 km) of a point and derives the attendant risk areas from probability forecasts of tornadoes, damaging winds, and large hail on Days 1 and 2, and a combined severe weather risk on Day 3—specifies the level of ...
On Wednesday, the severe weather threat zone will extend from western and central New York to northern Arkansas and western Tennessee. As storms progress through this 1,100-mile-long swath, more ...