Storm Prediction Center Severe Thunderstorm Watch 674

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The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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   SEL4

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 674
   NWS Storm Prediction Center Norman OK
   900 PM MDT Sun Sep 20 2026

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Eastern Colorado
     Western Kansas

   * Effective this Sunday night and Monday morning from 900 PM
     until 300 AM MDT.

   * Primary threats include...
     Scattered large hail and isolated very large hail events to 2
       inches in diameter possible
     Isolated damaging wind gusts to 60 mph possible

   SUMMARY...Easterly low-level winds and a moist air mass will support
   additional strong to severe thunderstorm development this evening.
   Some of these storms will be capable of large hail and locally
   damaging winds into the overnight.

   The severe thunderstorm watch area is approximately along and 60
   statute miles north and south of a line from 20 miles north
   northwest of Colorado Springs CO to 50 miles south of Goodland KS.
   For a complete depiction of the watch see the associated watch
   outline update (WOUS64 KWNS WOU4).

   PRECAUTIONARY/PREPAREDNESS ACTIONS...

   REMEMBER...A Severe Thunderstorm Watch means conditions are
   favorable for severe thunderstorms in and close to the watch area.
   Persons in these areas should be on the lookout for threatening
   weather conditions and listen for later statements and possible
   warnings. Severe thunderstorms can and occasionally do produce
   tornadoes.

   &&

   OTHER WATCH INFORMATION...CONTINUE...WW 673...

   AVIATION...A few severe thunderstorms with hail surface and aloft to
   2 inches. Extreme turbulence and surface wind gusts to 50 knots. A
   few cumulonimbi with maximum tops to 550. Mean storm motion vector
   30020.

   ...Guyer

Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.

   SAW4 
   WW 674 SEVERE TSTM CO KS 210300Z - 210900Z
   AXIS..60 STATUTE MILES NORTH AND SOUTH OF LINE..
   20NNW COS/COLORADO SPRINGS CO/ - 50S GLD/GOODLAND KS/
   ..AVIATION COORDS.. 50NM N/S /44SSW DEN - 45S GLD/
   HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..50 KNOTS.
   MAX TOPS TO 550. MEAN STORM MOTION VECTOR 30020.

   LAT...LON 39960486 39500170 37770170 38220486

   THIS IS AN APPROXIMATION TO THE WATCH AREA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
   FOR WOU4.

Watch 674 Status Report Message has not been issued yet.

Note:
 Click for Complete Product Text.

Tornadoes

Wind

Hail

Combined Severe Hail/Wind

For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The “Low” category contains probability values ranging from less than 2%
to 20% (EF2-EF5 tornadoes), less than 5% to 20% (all other probabilities),
“Moderate” from 30% to 60%, and “High” from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.