SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1127 PM CST Mon Nov 22 2021 Valid 231200Z - 241200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected on Tuesday. ...Discussion... A high-amplitude/progressive upper flow pattern will continue across the U.S. today, with a trough vacating the eastern U.S. while a second translates steadily across the West. In between, ridging will shift from the Plains to the Appalachians through the period. At the surface, high pressure will largely prevail east of the Mississippi, though a cold front -- associated with the progressing western U.S. upper trough -- will cross the northern/central Plains through the second half of the period. Meanwhile, high pressure will expand across the West in the wake of the advancing front. As a result of prior frontal passage, a dry/continental airmass will reside across the U.S. through the period. Weak return of an incompletely modified Gulf boundary layer is expected across southeastern Texas as low-level flow turns southerly ahead of the approaching western system, but with the airmass to remain convectively stable, thunderstorms are not expected across the U.S. through Wednesday morning. ..Goss.. 11/23/2021 Read more LIVE: spc.noaa.gov
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