SPC 0830Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0231 AM CST Tue Jan 19 2021 Valid 211200Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe weather is not expected across the U.S. on Thursday. ...Discussion... Fast westerly/west-northwesterly flow aloft is expected to continue across the U.S. on Thursday. An upper low initially centered over the northern Gulf of California vicinity is forecast to steadily weaken/deamplify as it shifts eastward toward the southern Plains. Meanwhile, an area of troughing off the coast of western Canada is progged to dig south-southeastward with time, affecting the Pacific Northwest through the second half of the period. At the surface, a weakening clipper-type system will move across the Northeast and adjacent eastern Canada with time, as high pressure builds into the north-central U.S. in its wake. Very weak low pressure is expected to move across the Southwest and into the southern Plains, ahead of the dampening upper system. Showers -- and possibly a few lightning flashes -- will spread across the Southwest during the day, in tandem with the upper trough and associated/weak surface system. A few flashes may also occur later over east Texas and the Arklatex. Here, however, coverage of any lightning appears as though it should remain below the 10% threshold required for inclusion of a thunder area. ..Goss.. 01/19/2021
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