SPC 1630Z Day 1 Outlook

Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
1029 AM CST Wed Jan 20 2021

Valid 201630Z - 211200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Isolated non-severe thunderstorms are possible across the Lower
Colorado Valley and southern Arizona through tonight.

...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.

..Guyer.. 01/20/2021

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