Storm Prediction Center Severe Thunderstorm Watch 673

Note: 
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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   SEL3

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 673
   NWS Storm Prediction Center Norman OK
   345 PM MDT Sun Sep 20 2026

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Eastern Colorado
     Far Western Kansas

   * Effective this Sunday afternoon and evening from 345 PM until
     900 PM MDT.

   * Primary threats include...
     Isolated very large hail events to 2 inches in diameter possible
     Isolated damaging wind gusts to 70 mph possible
     A tornado or two possible

   SUMMARY...Storms may remain relatively isolated, but a supercell or
   two could pose a risk for large hail and severe-caliber wind gusts
   through early/mid-evening across the region.

   The severe thunderstorm watch area is approximately along and 60
   statute miles east and west of a line from 25 miles east northeast
   of Burlington CO to 30 miles southeast of Lamar CO. For a complete
   depiction of the watch see the associated watch outline update
   (WOUS64 KWNS WOU3).

   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.

   &&

   AVIATION...A few severe thunderstorms with hail surface and aloft to
   2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
   few cumulonimbi with maximum tops to 550. Mean storm motion vector
   30020.

   ...Guyer

   SEL3

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 673
   NWS Storm Prediction Center Norman OK
   345 PM MDT Sun Sep 20 2026

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Eastern Colorado
     Far Western Kansas

   * Effective this Sunday afternoon and evening from 345 PM until
     900 PM MDT.

   * Primary threats include...
     Isolated very large hail events to 2 inches in diameter possible
     Isolated damaging wind gusts to 70 mph possible
     A tornado or two possible

   SUMMARY...Storms may remain relatively isolated, but a supercell or
   two could pose a risk for large hail and severe-caliber wind gusts
   through early/mid-evening across the region.

   The severe thunderstorm watch area is approximately along and 60
   statute miles east and west of a line from 25 miles east northeast
   of Burlington CO to 30 miles southeast of Lamar CO. For a complete
   depiction of the watch see the associated watch outline update
   (WOUS64 KWNS WOU3).

   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.

   &&

   AVIATION...A few severe thunderstorms with hail surface and aloft to
   2 inches. Extreme turbulence and surface wind gusts to 60 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.

   SAW3 
   WW 673 SEVERE TSTM CO KS 202145Z - 210300Z
   AXIS..60 STATUTE MILES EAST AND WEST OF LINE..
   25ENE ITR/BURLINGTON CO/ - 30SE LAA/LAMAR CO/
   ..AVIATION COORDS.. 50NM E/W /7W GLD - 32SE LAA/
   HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
   MAX TOPS TO 550. MEAN STORM MOTION VECTOR 30020.

   LAT...LON 39370072 37750119 37750339 39370297

   THIS IS AN APPROXIMATION TO THE WATCH AREA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
   FOR WOU3.

Watch 673 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.