388
ACUS48 KWNS 200824
SWOD48
SPC AC 200823

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0323 AM CDT Sun Sep 20 2026

Valid 231200Z - 281200Z

...DISCUSSION...
Upper ridging will persist over the central U.S. through the
forecast period, with a meandering upper trough evolving into a
cut-off upper low off of the Mid-Atlantic Coast and an upper trough
amplifying over the Interior West late this week into next weekend.
Through the week, a relatively dry low-level airmass will settle
east of the MS River and west of the Rockies, limiting the severe
threat over the western and eastern third of the U.S. Some modest
moisture return is likely across the Plains given lee troughing.
However, upper support will be weak, which should limit the severe
threat across the central U.S. as well. As such, no organized severe
threats seem apparent for the CONUS Days 4-8 (Wednesday-Sunday).

..Squitieri.. 09/20/2026