SPC 1630Z Day 1 Outlook

Day 1 Outlook Image

Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
1016 AM CST Wed Dec 09 2020

Valid 091630Z - 101200Z


Isolated thunderstorms will be possible late tonight into early
Thursday across southern Arizona.

...Southern AZ...
A cutoff upper low west of Baja CA will evolve into an open wave as
it ejects towards the AZ/Sonora border area by early Thursday.
Substantial moistening around 700 mb within the warm conveyor
downstream will contribute to an increase in rain showers tonight,
initially across southeast AZ. Isolated thunderstorms will also be
possible, and more probable across southwest AZ along the periphery
of the elevated moisture return, where mid-level lapse rates will be
steeper closer to the upper low. 12z forecast soundings from the
RAP/NAM suggest limited buoyancy should be present atop an initially
very dry sub-cloud layer, which would support overnight convection
with minimal rainfall.

..Bunting.. 12/09/2020

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