SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0140 PM CST Wed Jan 20 2021 Valid 202000Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated non-severe thunderstorms are possible across the Lower Colorado Valley and southern Arizona through tonight. ...20z Update... The ongoing forecast remains on track, and no changes are necessary with this update. For forecast details, please see the previous discussion below. ..Leitman.. 01/20/2021 .PREV DISCUSSION... /ISSUED 1029 AM CST Wed Jan 20 2021/ ...Southern Arizona/far southeast California... A closed upper low west of the Baja Peninsula will become somewhat more progressive as it evolves into an open wave through early Thursday morning while approaching the northern Gulf of California. Preceding it, a plume of sufficient low to mid-level moisture across the peninsula and gulf will support periods of showers and embedded thunderstorms mostly across the northwest portions of Mexico and adjacent waters. Some of this activity will spread across the international border, mainly later this afternoon through tonight across southern Arizona. Severe thunderstorms are unlikely owing to meager buoyancy and weak low-level winds.
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