SPC storm scale ensemble 00z run helicity > 25 m2/s2 valid 21z
Notes:
Forecasts of updraft helicity from the ensemble run at 00z and valid at 21z are shown on this slide. The probability of updrafts containing greater than 25 m2/s2 of helicity is shown on the left. Highest probabilities are shown over southwest New York. Individual forecasts are shown on the right. Several rotating cells are indicated, with the greatest concentration over the western half of New York.
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Slide 16