Heavy Snow Across the Northern Plains and Great Lakes; Strong Winds for the East

Travel conditions will be challenging across the northern Plains, Great Lakes and east coast through Thanksgiving holiday weekend. Heavy snow, blizzard conditions, for the upper Midwest and Great Lakes region through Thanksgiving to be followed by another strong storm for the Plains, Great Lakes and Northeast this weekend. Strong winds are expected with these systems adding to travel difficulties Read More >

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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Heavy Snow Across the Northern Plains and Great Lakes; Strong Winds for the East

Convective Parameters - Helicity