SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1006 AM CST Sat Feb 20 2021 Valid 201630Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible across a portion of the Great Basin this afternoon. ...Great Basin this afternoon... No changes to previous outlook. A midlevel shortwave trough and an associated baroclinic zone will move over NV/UT this afternoon, and reach the Four Corners tonight. Steep low-midlevel lapse rates will allow weak surface-based buoyancy to develop this afternoon, and some low-topped convection is expected in the zone of ascent along the baroclinic zone. Relatively cool profiles will tend to limit buoyancy and suggest that most of the precipitation will fall as snow. It appears that the somewhat greater threat for isolated lightning flashes will be this afternoon when the low levels are warmest. ..Thompson.. 02/20/2021
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