SPC 0700Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1252 AM CST Wed Jan 27 2021 Valid 281200Z - 291200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe weather is not expected across the U.S. Thursday. ...Discussion... Upper troughing/cyclonic flow will persist over the northeastern U.S. Thursday, as one shorter-wavelength feature shifts eastward into the western Atlantic, to be replaced by an upper low progressing southeastward out of eastern Canada into the Northeast. Meanwhile in the West, a sharp trough just off the West Coast will gradually advance inland through the period. In between, anticyclonic flow will prevail across a large portion of the central CONUS. At the surface, high pressure will prevail east of the Rockies, though a rather pronounced lee trough over the high Plains is expected. Meanwhile, a rather ill-defined cold front will move across California toward the Great Basin and Desert Southwest. With much of the country under the influence of a continental polar airmass, little convective potential is evident. One exception will be across portions of the West Coast states, as the upper trough shifts inland. In addition to low-topped showers, cold air/steep lapse rates aloft accompanying the trough could support a few/sporadic lightning flashes -- particularly near the central California coast late in the period. However, coverage at this time appears likely to remain too sparse to warrant introduction of a 10% thunder area. ..Goss.. 01/27/2021
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