123 
WUUS53 KBIS 120155
SVRBIS
NDC001-037-085-120245-
/O.NEW.KBIS.SV.W.0270.260812T0155Z-260812T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Bismarck ND
855 PM CDT Tue Aug 11 2026

The National Weather Service in Bismarck has issued a

* Severe Thunderstorm Warning for...
  South Central Grant County in south central North Dakota...
  Southwestern Sioux County in south central North Dakota...
  Eastern Adams County in southwestern North Dakota...

* Until 845 PM MDT.

* At 755 PM MDT, a severe thunderstorm was located 13 miles northeast
  of North Lemmon, or 34 miles east of Hettinger, moving southeast at
  15 mph.

  HAZARD...Tennis 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...
  Standing Rock.

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 4602 10206 4612 10187 4594 10145 4594 10199
TIME...MOT...LOC 0155Z 318DEG 15KT 4604 10193

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Adam

227 
WWUS53 KBIS 120231
SVSBIS

Severe Weather Statement
National Weather Service Bismarck ND
931 PM CDT Tue Aug 11 2026

NDC001-037-085-120241-
/O.CAN.KBIS.SV.W.0270.000000T0000Z-260812T0245Z/
Adams ND-Grant ND-Sioux ND-
831 PM MDT Tue Aug 11 2026

...SEVERE THUNDERSTORM WARNING IS CANCELLED FOR SOUTH CENTRAL GRANT,
SOUTHWESTERN SIOUX AND EASTERN ADAMS COUNTIES...

The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled. A Severe Thunderstorm
Warning still remains in effect for eastern Sioux County.

A Severe Thunderstorm Watch remains in effect until 1200 AM MDT for
portions of south central and southwest North Dakota.

&&

LAT...LON 4602 10206 4612 10187 4594 10145 4594 10199
TIME...MOT...LOC 0155Z 318DEG 15KT 4604 10193

$$

Adam