SPC 1730Z Day 2 Outlook

Day 2 Outlook Image

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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