SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1112 AM CST Wed Jan 20 2021 Valid 211200Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe weather is not expected across the U.S. on Thursday. ...Synopsis... The upper low over the lower Colorado River Valley/northwest Mexico will weaken and become an open wave as it progresses east/northeast across New Mexico, and moves into the southern Plains overnight. Cooling temperatures aloft near the compact low/shortwave trough will result in steep midlevel lapse rates and enough instability to support isolated lightning flashes near the Colorado Valley and into southern AZ. Further east, a southern and northern stream jet over the TN Valley/southern states and the Midwest will merge as a broad trough envelopes the eastern half of the country. Modest cooling aloft as the upper southwestern upper trough approaches during the evening and nighttime hours will allow for modest instability across portions of north TX into the lower MS Valley. A few lightning flashes could accompany showers during the later half of the forecast period. ..Leitman.. 01/20/2021
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