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Home Return to list Severe Thunderstorm Warning 0271 Issued by the Bismarck Forecast Office
Action: New Issued At: 2026-08-11 21:15:30
854
WUUS53 KBIS 120215
SVRBIS
NDC037-059-120300-
/O.NEW.KBIS.SV.W.0271.260812T0215Z-260812T0300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Bismarck ND
915 PM CDT Tue Aug 11 2026
The National Weather Service in Bismarck has issued a
* Severe Thunderstorm Warning for...
Northwestern Grant County in south central North Dakota...
Northwestern Morton County in south central North Dakota...
* Until 1000 PM CDT /900 PM MDT/.
* At 915 PM CDT /815 PM MDT/, a severe thunderstorm was located near
Heart Butte Dam, or 43 miles south of Beulah, moving east at 20
mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect
wind damage to roofs, siding, and trees.
* Locations impacted include...
Carson and Heart Butte Dam.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Seek shelter inside a well-built structure and stay away from
windows. This storm is capable of producing damaging winds and large
hail.
&&
LAT...LON 4676 10210 4684 10154 4637 10153 4647 10205
4663 10205 4663 10210
TIME...MOT...LOC 0214Z 266DEG 18KT 4664 10185
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Adam
Action: Continued Issued At: 2026-08-11 21:24:30
948
WWUS53 KBIS 120224
SVSBIS
Severe Weather Statement
National Weather Service Bismarck ND
924 PM CDT Tue Aug 11 2026
NDC037-059-120300-
/O.CON.KBIS.SV.W.0271.000000T0000Z-260812T0300Z/
Grant ND-Morton ND-
924 PM CDT Tue Aug 11 2026 /824 PM MDT Tue Aug 11 2026/
...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 10 PM CDT /9
PM MDT/ FOR NORTHWESTERN GRANT AND NORTHWESTERN MORTON COUNTIES...
At 924 PM CDT /824 PM MDT/, a severe thunderstorm was located 6 miles
north of Heart Butte Dam, or 40 miles south of Beulah, moving east at
25 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Carson and Heart Butte Dam.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Anyone outdoors should move to shelter inside a well-built structure
and stay away from windows. This storm is capable of producing
dangerous hail and damaging winds.
&&
LAT...LON 4672 10206 4677 10206 4684 10154 4641 10153
4651 10205 4663 10205
TIME...MOT...LOC 0215Z 262DEG 22KT 4668 10189
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Adam
Action: Continued Issued At: 2026-08-11 21:40:01
322
WWUS53 KBIS 120239
SVSBIS
Severe Weather Statement
National Weather Service Bismarck ND
939 PM CDT Tue Aug 11 2026
NDC037-059-120300-
/O.CON.KBIS.SV.W.0271.000000T0000Z-260812T0300Z/
Grant ND-Morton ND-
939 PM CDT Tue Aug 11 2026 /839 PM MDT Tue Aug 11 2026/
...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 10 PM CDT /9
PM MDT/ FOR NORTH CENTRAL GRANT AND WESTERN MORTON COUNTIES...
At 939 PM CDT /839 PM MDT/, a severe thunderstorm was located 9 miles
northeast of Heart Butte Dam, or 38 miles west of Mandan, moving east
at 25 mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Heart Butte Dam.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Seek shelter inside a well-built structure and stay away from
windows. This storm is capable of producing damaging winds and large
hail.
&&
LAT...LON 4672 10186 4680 10187 4684 10154 4649 10153
4658 10185
TIME...MOT...LOC 0224Z 262DEG 22KT 4669 10181
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Adam
Action: Expired Issued At: 2026-08-11 22:08:32
064
WWUS53 KBIS 120308
SVSBIS
Severe Weather Statement
National Weather Service Bismarck ND
1008 PM CDT Tue Aug 11 2026
NDC037-059-120318-
/O.EXP.KBIS.SV.W.0271.000000T0000Z-260812T0300Z/
Grant ND-Morton ND-
1008 PM CDT Tue Aug 11 2026 /908 PM MDT Tue Aug 11 2026/
...SEVERE THUNDERSTORM WARNING HAS EXPIRED FOR NORTH CENTRAL GRANT
AND WESTERN MORTON COUNTIES...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire. A Severe
Thunderstorm Warning still remains in effect for eastern Morton
County.
&&
LAT...LON 4672 10186 4680 10187 4684 10154 4649 10153
4658 10185
TIME...MOT...LOC 0239Z 262DEG 22KT 4670 10167
$$
Adam
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