Snowy, Very Cold and Windy from the Northern Plains to Great Lakes; Critical Fire Weather in South Texas

Moderate to heavy lake effect snow is expected downwind of the Great Lakes, with the Chicago metro potentially receiving 6 to 12 inches of snowfall. A frigid airmass will bring very cold temperatures to the Central U.S. and Mississippi Valley today, migrating into the Eastern U.S. on Monday. Dry and windy weather will bring critical fire weather conditions to South Texas today. Read More >

Automatically generated image showing areas of 0-3 km storm relative helicity.


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Helicity (0-3 Km)

This is the 0-3 km (0-10,000 Ft. AGL) storm relative helicity which is a measure of the amount of wind shear available from the ground to roughly 700 MB. Values greater than 250 m**2/s**2 suggest an increased threat of tornadoes, but high values with this index do not necessarily suggest that the environment is supportive of supercell structures (look at 0-6 km shear). Larger values are generally better, but there are no clear "boundaries" between non-tornadic and significant tornadic supercells. Negative values suggest that anti-cylonic (left moving) supercells will dominate.

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Snowy, Very Cold and Windy from the Northern Plains to Great Lakes; Critical Fire Weather in South Texas

Convective Parameters - Helicity 0-3km