ACUS11 KWNS 200030
SWOMCD
SPC MCD 200029
KSZ000-COZ000-200230-

Mesoscale Discussion 2313
NWS Storm Prediction Center Norman OK
0729 PM CDT Sat Sep 19 2026

Areas affected...eastern Colorado into western Kansas

Concerning...Severe Thunderstorm Watch 671...

Valid 200029Z - 200230Z

The severe weather threat for Severe Thunderstorm Watch 671
continues.

SUMMARY...Severe threat continues within WW671.

DISCUSSION...Supercells continue within WW671, producing 1.75-2 inch
hail across eastern Colorado. Several storm interactions have
occurred, with a hybrid supercell/multicell cluster and outflow
boundary moving southeastward. Storms are steadily moving into a
more favorably sheared and moist/unstable air mass. The threat for
large hail will continue in the short term, with potential for hail
up to 2 inches. Observational trends and CAM guidance would suggest
that storms may eventually cluster along outflow with an increase in
damaging wind potential into the evening.

..Thornton.. 09/20/2026

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fjg!8yVbrqsTaUW6iazPQQ6uA46gigXV6DAsiz_AlX3NeeAJK4NeRgvaV6qATxawzHCiMhTw5n2ZSAzq1Wp6iP1-heORo8I$ for graphic product...

ATTN...WFO...GLD...PUB...

LAT...LON 39390205 39290251 39040260 38820262 38740261 38680241
38550200 38310190 38310156 38470138 38650126 38810123
39020125 39300156 39390205

MOST PROBABLE PEAK WIND GUST...65-80 MPH
MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN


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