SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1054 AM CST Tue Jan 12 2021 Valid 131200Z - 141200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected over the U.S. mainland on Wednesday. ...Synopsis... A progressive upper pattern will be in place across the CONUS on Wednesday. A series of upper shortwave troughs, one over the southern U.S., the other over the Great Lakes, will merge as they pivot eastward toward/just offshore the Atlantic seaboard. Offshore, continental trajectories and a weak south/southeastward-advancing cold front will keep any appreciable moisture well offshore, with dry and stable conditions expected across most of the CONUS. A few showers or an isolated lightning flash is possible near the Florida Straits vicinity, but should not impact southwest FL or the Keys. Another more intense shortwave trough will quickly develop south and east from the northern Rockies Wednesday morning into the Plains late in the period. This will bring a strong cold front across the Rockies and through much of the Plains by Thursday morning. While intense winds are expected with this system across parts of Montana into the northern High Plains, a lack of boundary layer moisture will result in little instability, mitigating the chance of thunderstorms. ..Leitman.. 01/12/2021
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