609
ACUS48 KWNS 290828
SWOD48
SPC AC 290826

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0326 AM CDT Fri May 29 2026

Valid 011200Z - 061200Z

...DISCUSSION...
...Monday/Day 4 to Wednesday/Day 6...
At mid-levels, a ridge is forecast to move from the north-central
U.S. on Monday into the Great Lakes by Wednesday, as a shortwave
trough moves slowly eastward from the northern Rockies into the
northern Plains. In the vicinity of the ridge on Monday, an axis of
moderate to strong instability is forecast to develop. In spite of
limited forcing, isolated severe storms may form on Monday afternoon
over parts of the north-central U.S., mainly in areas where
low-level convergence becomes maximized. On Tuesday, isolated severe
storms will be possible ahead of the approaching trough along a
north-to-south corridor of instability in the Dakotas and Nebraska.
Storms will again be possible ahead of the trough in the upper
Mississippi and mid Missouri Valleys on Wednesday. The primary
threats would be isolated severe gusts and hail.

...Thursday/Day 7 and Friday/Day 8...
The mid-level trough is forecast to move into the Great Lakes on
Thursday and into the Northeast on Friday, as another trough moves
into the central U.S. Ahead of this second trough, isolated severe
storms will be possible on Thursday and Friday in parts of the
central and northern Plains. A few of the stronger storms could be
associated with severe wind gusts and hail.

..Broyles.. 05/29/2026