450 
ACUS01 KWNS 201610
SWODY1
SPC AC 201609

Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
1109 AM CDT Sat Jun 20 2026

Valid 201630Z - 211200Z

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
THE CENTRAL PLAINS THIS AFTERNOON AND TONIGHT....

...SUMMARY...
Severe thunderstorms are likely across parts of the central Plains
mainly this afternoon and evening. Large to very large hail, severe
winds (some 75+ mph), and a few tornadoes are possible.

...Central Plains...
Water vapor imagery shows a shortwave trough over ID/UT tracking
eastward toward the central High Plains.  Southerly/southeasterly
low-level winds ahead of this feature over parts of eastern
CO/western NE/KS will help to maintain a moist and moderately
unstable air mass across the region, especially as low clouds
continue to burn off and afternoon heating commences.  Scattered
thunderstorm development is expected by mid-afternoon over central
WY down into central CO in favored terrain/convergence areas.  This
activity will spread eastward into a progressively more
moist/unstable air mass and intensify into supercells.  A corridor
of favorable vertical shear will develop later today from northeast
CO into southwest NE/northwest KS for isolated tornadoes. 
Otherwise, very large hail and damaging winds will be the main
concerns.  Activity is likely to organize upscale during the evening
and spread across KS with a damaging wind risk persisting much of
the night.

...Southeast...
A very moist and moderately unstable air mass is present again today
over much of the southeast US.  Most CAM solutions suggest scattered
afternoon thunderstorms across this area, including along the FL
east coast.  Dewpoints in the 70s and PWAT values around 2 inches,
coupled with strong daytime heating and steep low-level lapse rates
suggest a risk of locally gusty/damaging wind gusts in the most
intense cores.

..Hart/Moore.. 06/20/2026

$$