SPC 0830Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0124 AM CST Tue Dec 15 2020 Valid 171200Z - 181200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... The risk for thunderstorm activity appears negligible across the U.S., Thursday through Thursday night. ...Discussion... A couple of branches of westerlies emanating from the mid-latitude Pacific will maintain a considerable influence across southern Canada and the U.S. during this period. These will remain generally zonal, with a number of embedded, progressive short wave perturbations. In the wake of a significant surface cyclone migrating east of the northern Atlantic Seaboard, a trailing cold front is forecast to advance through the remainder of the southeastern Gulf of Mexico and Florida Peninsula. And boundary layer conditions over much of the northern Gulf of Mexico will remain relatively cool and dry. Short wave troughs progressing east of the Canadian Rockies, and across the U.S. Rockies, likely will contribute to surface cyclogenesis across the Canadian Prairies, with deepening surface troughing as far south as the southern Great Plains. While this will be accompanied by a strengthening southerly low-level jet from the Texas South Plains into Minnesota by late Thursday night, there appears negligible potential for appreciable low-level moistening or destabilization. ..Kerr.. 12/15/2020
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