National Weather Service United States Department of Commerce

Severe Weather and Excessive Rain in the Ohio and Tennessee Valley; Dangerous Heat in the South

Widespread strong to severe thunderstorms may produce large hail, damaging wind gusts, a few tornadoes, and flash flooding across parts of the lower Missouri Valley into the Ohio and Tennessee Valleys. Dangerous and potentially record-breaking heat continues across parts of Texas, the western Gulf Coast, southern Florida, and Puerto Rico. Read More >

Automatically generated image showing areas of storm relative helicity.

 

Thumbnail of an automatically generated image showing areas of storm relative helicity. Thumbnail of an automatically generated image showing areas of storm relative helicity. Thumbnail of an automatically generated image showing areas of storm relative helicity.
Hour - 1 Hour - 2 Hour -3

4 Panel Display | Animated Loop

Helicity (0-1 Km) 

This is the 0-1 km (approximately 0-3,000 Ft. AGL) storm relative helicity which is a measure of the amount of low level wind shear available for tornadogenesis. This is not a good indicator of supercell potential which is related more strongly to 0-6 KM vertical shear. Values greater than 100 m**2/s**2, do suggest an increased threat of tornadoes provided a supercell is present.  Larger values are generally better, but there are no clear "boundaries" between non-tornadic and significant tornadic supercells.

The arrows indicate the approximate right supercell storm motion using the Bunkers technique.

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