Severe Storm Outlook Narrative (AC)
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ACUS48 KWNS 250752
SWOD48
SPC AC 250750

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0250 AM CDT Mon Sep 25 2017

Valid 281200Z - 031200Z

...DISCUSSION...
A shortwave trough will migrate southward across portions of the
Great Lakes through D4/Thursday and D5/Friday, while a weakening
cutoff low dissipates across the Intermountain West.  At the
surface, an expansive ridge will spread a cooler, drier airmass of
continental origin across much of the central and eastern CONUS,
with deeper boundary layer moisture confined to Gulf Coast regions
south of a stationary front in that area.  This overall pattern will
result in a minimal severe threat through at least D7/Sunday.

After D7, an active/amplified mid-level pattern across the northern
tier of the U.S. may interact with returning boundary layer moisture
on the western periphery of an anticyclone as it shifts toward the
East Coast.  This pattern may eventually result in a returning
severe risk to the center of the country beyond the extended
forecast period although confidence is low.

..Cook.. 09/25/2017



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