SPC 2000Z Day 1 Outlook

Day 1 Outlook Image

Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
0127 PM CST Sun Jan 17 2021

Valid 172000Z - 181200Z

...NO THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Thunderstorms are not expected across the contiguous U.S. through
tonight.

...Discussion...

The previous forecast remains on track. Rain and snow showers will
persist across the OH Valley and central Appalachians this afternoon
and evening, but the depth of the convective layer and degree of
instability are too marginal for thunderstorms.

..Dial.. 01/17/2021

.PREV DISCUSSION... /ISSUED 1030 AM CST Sun Jan 17 2021/

...Synopsis/Discussion...
The potential for lightning-producing convection will be essentially
nil across the CONUS this afternoon and tonight. Associated with an
advancing shortwave trough, a couple of lightning flashes cannot be
conclusively ruled out this afternoon amid steep lapse rates across
the middle Ohio Valley and Cumberland Plateau, however this
potential should remain very low given the very shallow nature of
the convection.

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