609
ACUS48 KWNS 170750
SWOD48
SPC AC 170748

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0248 AM CDT Mon Aug 17 2026

Valid 201200Z - 251200Z

...DISCUSSION...
An amplified upper pattern will persist during the Day 4-8/Thu-Mon
period. An upper trough will remain over the eastern U.S. while
strong upper ridging spreads from the western U.S. toward the Plains
late in the period. This pattern will result in moderate
northwestern flow aloft across portions of the Plains into the
Midwest. Beneath northwesterly flow aloft and on the eastern
periphery of upper ridging, a seasonally moist airmass will be in
place from the Mid/Lower MO Valley into the Upper/Middle MS Valley.
Some severe potential could develop over these areas through the
period. However, capping may limit this potential, and with no
notable features fostering focused large-scale ascent, uncertainty
is too high to include 15 percent severe probabilities at this time.

..Leitman.. 08/17/2026