The Risk for a Brief Spin-up Tornado Continues for the Next 60-120 Minutes

| December 14, 2020 @ 1:30 am

The risk for a brief QLCS tornado might persist for another hour or two in a narrow corridor across east-central AL.

A low-topped narrow squall line of showers produced a TDS around 0700Z in southern Jefferson County. This portion of the squall line appears to be co-located with the surface cyclone that is expected to continue east into northern GA through daybreak. A confined plume of 63-64 F surface dew points just ahead of the cyclone appears to be sufficient to yield scant surface-based buoyancy with MLCAPE of 100-200 J/kg per 06Z RAP soundings. In the presence of extreme low-level SRH (0-1 km above 500 m2/s2), the risk for another brief tornado is not entirely negligible where surface winds can remain southerly in a narrow corridor ahead of the cyclone. Surface winds that are more south-southwesterly across the warm sector will minimize the risk farther south.

Category: Alabama's Weather, ALL POSTS, Severe Weather

About the Author ()

Scott Martin is an operational meteorologist, professional graphic artist, musician, husband, and father. Not only is Scott a member of the National Weather Association, but he is also the Central Alabama Chapter of the NWA president. Scott is also the co-founder of Racecast Weather, which provides forecasts for many racing series across the USA. He also supplies forecasts for the BassMaster Elite Series events including the BassMaster Classic.

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