National Weather Service United States Department of Commerce

Thunderstorms and Heavy Rainfall in the Mid-Atlantic; Fire Weather Concerns in the West

Thunderstorms are expected to bring heavy rain and potential significant flash and urban flooding to the Mid-Atlantic on Thursday, especially along the I-95 urban corridor. Dry conditions, gusty winds, and isolated dry thunderstorms will continue to bring a critical fire weather threat to the northwestern Great Basin into the interior Northwest through Thursday. 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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