National Weather Service United States Department of Commerce

Snow & Ice Across the Rockies & Plains; Zeta Forecast to Head Toward the Gulf Coast

Snow and ice will continue over the central and southern Rockies and eastward into the High Plains through Tuesday along with record cold temperatures. Farther west, critical to extreme fire weather conditions are expected in the Desert Southwest, Great Basin, and California. Elsewhere, Zeta is forecast to be at or near hurricane strength as it approaches the northern Gulf Coast on Wednesday. Read More >

Automatically generated image showing areas of convective available potential energy.

 

Thumbnail of an automatically generated image showing areas of convective available potential energy. Thumbnail of an automatically generated image showing areas of convective available potential energy. Thumbnail of an automatically generated image showing areas of convective available potential energy.
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CAPE 

This is a surface based Convective Available Potential Energy (CAPE) measurement only.  In the cool season, elevated instability may be much higher than surface based cape.

On average, CAPE of 1000 J/Kg is usually sufficient for strong to severe storms. CAPE of 3,000 to 4,000 J/Kg or higher is usually a signal of a very volatile atmosphere that could produce severe storms if other environmental parameters are in place.

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