National Weather Service United States Department of Commerce

Flood Threat For Several Locations Today

The active monsoon season will continue the rest of the week and the flood threat today stretches from the Arizona to portions of the Intermountain West. Meanwhile, a humid and moist air mass ahead of a cold front may result in heavy rain and flooding from the Mid-Atlantic to the eastern Ohio and Tennessee Valleys. Finally, slow moving storms may produce flooding for the central Gulf Coast states. Read More >

Automatically generated image showing areas of surface-1km vertical shear.

 

Thumbnail of an automatically generated image showing areas of surface-1km vertical shear. Thumbnail of an automatically generated image showing areas of surface-1km vertical shear. Thumbnail of an automatically generated image showing areas of surface-1km vertical shear.
Hour - 1 Hour - 2 Hour -3

4 Panel Display | Animated Loop

Shear (0-1km) 

Surface-1-km Vertical Shear is the difference between the surface wind and the wind at 1-km above ground level. These data are plotted as vectors with shear magnitudes contoured. 0-1-km shear magnitudes greater than 15-20 knots tend to favor supercell tornadoes.

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