Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
0240 PM CDT Sun Oct 18 2026

Valid 182000Z - 191200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe thunderstorms are not forecast through tonight.

...20z Updates...

No changes are necessary for the Day 1 update. See previous
discussion below.

..Leitman.. 10/18/2026

.PREV DISCUSSION... /ISSUED 1114 AM CDT Sun Oct 18 2026/

...Synopsis...
Tranquil conditions will exist across much of the contiguous United
States through tonight.  Extensive surface high pressure influencing
much of the central and eastern U.S. will favor offshore flow into
the northern Gulf of America and feature a seasonably dry/stable
airmass.  A few weak thunderstorms are possible over south FL and
the Keys to the north of a surface front undergoing frontolysis
across the southern Gulf and FL Straits.  Farther west, an upper
trough migrating northeast across the Four Corners will be
associated with isolated showers/thunderstorms across parts of the
Southwest.