856
WWUS20 KWNS 271900
SEL5
SPC WW 271900
MTZ000-WYZ000-280100-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 405
NWS STORM PREDICTION CENTER NORMAN OK
105 PM MDT SAT JUN 27 2026
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHEAST MONTANA
NORTHEAST WYOMING
* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 105 PM UNTIL
700 PM MDT.
* PRIMARY THREATS INCLUDE...
SCATTERED LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL EVENTS
TO 2.5 INCHES IN DIAMETER POSSIBLE
SCATTERED DAMAGING WINDS AND ISOLATED SIGNIFICANT GUSTS TO 80
MPH POSSIBLE
A TORNADO OR TWO POSSIBLE
SUMMARY...STEADY SEVERE STORM DEVELOPMENT INCLUDING SUPERCELLS ARE
EXPECTED RELATIVELY EARLY TODAY, STEADILY INCREASING THROUGH THE
AFTERNOON ACROSS THE REGION, INCLUDING THE POTENTIAL FOR VERY LARGE
HAIL AND SEVERE-CALIBER WIND GUSTS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75
STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES SOUTH SOUTHWEST
OF GILLETTE WY TO 25 MILES NORTH NORTHWEST OF MILES CITY MT. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU5).
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 403...WW 404...
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO
2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A
FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR
22030.
...GUYER
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