Coastal Storm Impacting the Mid-Atlantic; Heavy to Excessive Rain in the Plains; Tropical Depression Seven in the Atlantic

A coastal storm continues to bring bands of heavy rain, gusty winds, minor coastal flooding, and rip currents over the Mid-Atlantic region today. Heavy rain showers and thunderstorms persist across the Plains today with possible excessive rainfall over western South Dakota. Tropical Depression Seven has formed in the central Atlantic and could become a tropical storm later 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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Coastal Storm Impacting the Mid-Atlantic; Heavy to Excessive Rain in the Plains; Tropical Depression Seven in the Atlantic

Convective Parameters - Helicity 0-3km