SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1022 AM CST Mon Dec 21 2020 Valid 211630Z - 221200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected through tonight. ...Synopsis/Discussion... Deep convective potential is expected to essentially be nil over the CONUS through tonight. A semi-amplified but progressive large-scale pattern will prevail, highlighted by a prevalent upper trough over the Great Lakes/Northeast States, while another shortwave trough/associated front moves inland over the Pacific Northwest. A cold frontal passage has ended the early day thunderstorm potential across southern Florida. A stray lightning flash cannot be conclusively ruled out near coastal Washington later this afternoon/early evening. However, even with steepening mid-level lapse rates, thermodynamic profiles are likely to remain very marginal for lightning generation, with associated thunderstorm probabilities remaining below 10 percent. ..Guyer.. 12/21/2020
There’s more click here.