Storm Prediction Center Severe Thunderstorm Watch 179

Note: 
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for Watch Status Reports.

   SEL9

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 179
   NWS Storm Prediction Center Norman OK
   435 PM MDT Sun Apr 27 2025

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Southeast Montana
     Southwest North Dakota
     Western South Dakota

   * Effective this Sunday afternoon from 435 PM until Midnight MDT.

   * Primary threats include...
     Scattered large hail and 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...Severe storm development is expected across the region
   through the remainder of the afternoon into early/mid-evening, with
   large hail expected to the most probable risk, with damaging winds
   and possibly some/brief tornado risk as well.

   The severe thunderstorm watch area is approximately along and 80
   statute miles east and west of a line from 45 miles west northwest
   of Baker MT to 35 miles east southeast of Rapid City SD. For a
   complete depiction of the watch see the associated watch outline
   update (WOUS64 KWNS WOU9).

   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 178...

   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 500. Mean storm motion vector
   24025.

   ...Guyer

   SEL9

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 179
   NWS Storm Prediction Center Norman OK
   435 PM MDT Sun Apr 27 2025

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Southeast Montana
     Southwest North Dakota
     Western South Dakota

   * Effective this Sunday afternoon from 435 PM until Midnight MDT.

   * Primary threats include...
     Scattered large hail and 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...Severe storm development is expected across the region
   through the remainder of the afternoon into early/mid-evening, with
   large hail expected to the most probable risk, with damaging winds
   and possibly some/brief tornado risk as well.

   The severe thunderstorm watch area is approximately along and 80
   statute miles east and west of a line from 45 miles west northwest
   of Baker MT to 35 miles east southeast of Rapid City SD. For a
   complete depiction of the watch see the associated watch outline
   update (WOUS64 KWNS WOU9).

   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 178...

   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 500. Mean storm motion vector
   24025.

   ...Guyer

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

   SAW9 
   WW 179 SEVERE TSTM MT ND SD 272235Z - 280600Z
   AXIS..80 STATUTE MILES EAST AND WEST OF LINE..
   45WNW BHK/BAKER MT/ - 35ESE RAP/RAPID CITY SD/
   ..AVIATION COORDS.. 70NM E/W /37ENE MLS - 27ESE RAP/
   HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
   MAX TOPS TO 500. MEAN STORM MOTION VECTOR 24025.

   LAT...LON 46590344 43840080 43840401 46590681

   THIS IS AN APPROXIMATION TO THE WATCH AREA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
   FOR WOU9.

Watch 179 Status Report Messages:

STATUS REPORT #1 ON WW 179

VALID 272335Z - 280040Z

THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.

..SPC..04/27/25

ATTN...WFO...BYZ...BIS...UNR...

&&

STATUS REPORT FOR WS 179 

SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS 

MTC011-017-025-075-087-280040-

MT 
.    MONTANA COUNTIES INCLUDED ARE

CARTER		     CUSTER		 FALLON 	     
POWDER RIVER	     ROSEBUD		 
$$


NDC001-011-087-280040-

ND 
.    NORTH DAKOTA COUNTIES INCLUDED ARE

ADAMS		     BOWMAN		 SLOPE		     
$$


SDC019-033-047-055-063-081-093-103-105-137-280040-

SD 
.    SOUTH DAKOTA COUNTIES INCLUDED ARE

BUTTE		     CUSTER		 FALL RIVER	     
HAAKON		     HARDING		 LAWRENCE	     
MEADE		     PENNINGTON 	 PERKINS	     
ZIEBACH 	     
$$


THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY.  PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$

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.