Tracking Storms with Impacts in the Northwest and Northeast U.S.

A Pacific storm will move across the Northwest U.S. through Thursday with low elevation rainfall, gusty winds, and mountain snows. A storm crossing the Northeast U.S. will continue gusty to high winds, scattered rain showers and limited snow showers into Thursday. Read More >

Automatically generated image showing areas of the significant tornado parameter.


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Significant Tornado (SigTor)

A composite index that includes 0-6 km bulk wind shear, 0-1 km storm-relative helicity, surface based CAPE, surface parcel CIN, and surface parcel LCL height. Values greater than 1 are indicative of increased potential of significant tornadoes.

The contours are the Lifted Condensation Level or LCL. A lower LCL typically increases tornadic risk because it is indicative of air parcel acceleration occurring closer to the surface.

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Tracking Storms with Impacts in the Northwest and Northeast U.S.

Convective Parameters - SigTor