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SPC Day 1 Outlook

Updates are issued at 0600 UTC, 1300 UTC, 1630 UTC, 2000 UTC, 0100 UTC - Current UTC time: Feb 28 2020 8:31 pm

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Day 2

Categorical Day 1 Outlook

ACUS01 KWNS 281240
SPC AC 281239

Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
0639 AM CST Fri Feb 28 2020

Valid 281300Z - 291200Z


The risk of severe storms appears negligible today through tonight.

A deep midlevel trough will dominate the CONUS from the MS
Valley/Great Lakes to the Atlantic coast, while an upstream
shortwave trough moves inland over the Pacific Northwest this
evening.  In general, low-level moisture and buoyancy will be quite
limited as a result of a prior frontal passage across the
central/eastern states.  However, an embedded shortwave trough over
SD/NE early this morning will move southeastward to southern
MO/northern AR by this afternoon.  Very cold midlevel temperatures
(near -32 C at 500 mb), in combination with afternoon surface
temperatures in the low 50s and dewpoints in the mid 30s, may prove
sufficient for surface-based CAPE up to 250 J/kg near the MO/AR
border.  Here, convection could become sufficiently deep and cloud
tops sufficiently cold to support mixed phase and charge separation,
and the threat for isolated thunderstorms with small hail and gusty
(sub-severe) outflow winds.  Farther east, shallow convection is
expected this afternoon across the southern Appalachians with a lead
shortwave trough, but even less buoyancy and shallower convective
depths (compared to MO/AR) suggest that lightning is unlikely.

Otherwise, a shortwave trough near 47 N and 135 W will move inland
over WA/northern OR by this evening.  Cooling midlevel temperatures
and steepening lapse rates in the post-frontal environment should be
sufficient for weak buoyancy near the coast, and an associated
threat for isolated lightning flashes after 03z.

..Thompson/Jewell.. 02/28/2020


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