The combination of intense heat, humidityand a frontal boundary will once again drive the development of some powerful thunderstorms into tonight.
Some of the same ingredients came together to form Friday night's deadly 'Super Derecho,' and storms over the weekend as well.
Fortunately, a derecho is a relatively rare event. However, complexes of thunderstorms, a few steps lower in intensity than a derecho, are more common. Although less intense, they can cause damage and threaten lives.
While anywhere from the northern Rockies to the Southeast, on the northern and eastern edge of the so-called 'ring of fire', could experience a brief, gusty thunderstorm, severe weather appears most probable in the Upper Midwest and in part of the Deep South.
These two areas will be close to potent atmospheric disturbances that could help turn more ordinary summertime thunderstorms into complexes of intense wind and rain.
South
Cloud cover, slightly lower humidity and/or prior storms have reduced the risk of violent thunderstorms over Carolinas and mid-Atlantic this evening. However, a stray, gusty thunderstorm cannot be ruled-out tonight.
Many of these areas are not only dealing with cleanup and power restoration efforts fromFriday night's derecho, but with additional rounds of storms which rolled through on Saturday and Sunday.
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