Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
0718 AM CDT Mon Apr 20 2026

Valid 201300Z - 211200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe storms are not expected today.

...Synopsis...
Water-vapor imagery this morning shows a weak upper trough centered
over AZ and Sonora moving east undercutting a ridge over the
Rockies.  This upper feature will move into the southern High Plains
by late tonight.  Farther west, a mid- to upper-level low will move
slowly east from the eastern Pacific toward the CA/OR coast.  

Scattered showers and weak elevated storms will be possible across a
large portion of TX today.  Farther west, isolated to scattered
thunderstorms are possible in association with the weak upper trough
over parts of the Desert Southwest.  Primarily diurnal storm
activity over the southern FL Peninsula is expected, as well as
isolated late day thunderstorms over portions of the Cascades.

Elsewhere, surface high pressure will lead to tranquil conditions
across much of the CONUS precluding storm development.

..Smith/Thompson.. 04/20/2026

Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
1052 AM CDT Mon Apr 20 2026

Valid 201630Z - 211200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe storms are not expected today.

...Synopsis...
An upper impulse will continue to pose a risk of scattered
thunderstorms over parts of NM and south/west TX through the
afternoon, with activity spreading into north-central TX late
tonight.  

Other thunderstorms are possible this afternoon and evening over
south FL in a moist and marginally unstable air mass, along the
coast of southern New England, and over portions of OR/WA.  In all
areas, weak instability will preclude the risk of organized severe
storms.

..Hart/Flournoy.. 04/20/2026