SPC 2000Z Day 1 Outlook
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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