SPC 1200Z Day 1 Outlook

Day 1 Outlook Image

Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
1236 AM CDT Tue Oct 20 2020

Valid 201200Z - 211200Z


Severe storms are not expected across the continental United States
Tuesday and Tuesday night.

A belt of stronger and broadly cyclonic mid-level flow will remain
across the northern CONUS on Tuesday as a pronounced shortwave
trough within the flow moves across the northern Plains/upper
Midwest. A surface cold front will move east across portions of the
northeast states and Ohio Valley while the western extension of the
front lifts northward as a warm front across the southern Plains.
Widely scattered to scattered thunderstorms will develop near the
front Tuesday, aided by frontal convergence in the presence of
weak/isolated pockets of moderate surface-based buoyancy. The
stronger deep-layer shear will remain north of the more substantial
instability, and as a result severe storms are not expected.

Scattered thunderstorms will be possible Tuesday across FL and
coastal sections of the southeast states in the vicinity of a
mid-level disturbance and weakening coastal front. Weak vertical
wind shear will limit intensity, however gusty winds will be
possible with the stronger storms.

..Bunting/Lyons.. 10/20/2020

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