667
ACUS02 KWNS 180555
SWODY2
SPC AC 180553

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1253 AM CDT Mon Aug 18 2025

Valid 191200Z - 201200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
A severe threat is not expected across the continental U.S. on
Tuesday or Tuesday night.

...DISCUSSION...
A mid-level ridge will build northward across the central Rockies
and northern High Plains on Tuesday, as a subtle shortwave trough
moves through the Great Lakes region. At the surface, a cold front
will advance southward into the Ohio and mid Mississippi Valleys,
extending westward into the southern Plains. As surface temperatures
warm during the day, low-level convergence near the front will be
favorable for isolated to scattered thunderstorm development.
Limited large-scale ascent and weak deep-layer shear will be
unfavorable for severe storms. Further northwest into the
north-central states, moderate instability will be possible by
Tuesday afternoon, mainly in the Dakotas. However, a severe threat
is not expected due to limited large-scale ascent, minimal low-level
convergence, and weak deep-layer shear. Elsewhere across the
continental U.S., a severe threat is not expected Tuesday and
Tuesday night.

..Broyles.. 08/18/2025

$$