Severe Thunderstorm Warning 13, NWS Bismarck, ND

775 
WWUS53 KBIS 160734
SVSBIS

Severe Weather Statement
National Weather Service Bismarck ND
234 AM CDT Mon Jun 16 2025

NDC037-059-085-160815-
/O.CON.KBIS.SV.W.0013.000000T0000Z-250616T0815Z/
Sioux ND-Morton ND-Grant ND-
234 AM CDT Mon Jun 16 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 AM
CDT/215 AM MDT/ FOR SIOUX...SOUTHEASTERN MORTON AND EASTERN GRANT
COUNTIES...

At 234 AM CDT/134 AM MDT/, severe thunderstorms were located along a
line extending from near Flasher to 6 miles northwest of Selfridge to
Walker, moving east at 55 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Flasher, Fort Yates, Selfridge, Solen, Cannon Ball, St. Anthony,
Prairie Knights Resort, Shields, Lark, Raleigh, Breien, Hazelton
Recreation Area, Stumpf State Natural Area, Huff, St. Gertrude, Fort
Rice, Porcupine, Standing Rock, and Standing Rock Nation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4595 10143 4622 10129 4628 10145 4663 10136
      4664 10066 4661 10063 4659 10056 4657 10059
      4652 10054 4650 10058 4644 10060 4637 10055
      4633 10055 4628 10058 4623 10056 4613 10063
      4605 10061 4597 10051 4594 10052
TIME...MOT...LOC 0734Z 263DEG 47KT 4645 10117 4612 10099 4594 10109 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

HOLLAN

136 
WWUS53 KBIS 160752
SVSBIS

Severe Weather Statement
National Weather Service Bismarck ND
252 AM CDT Mon Jun 16 2025

NDC037-059-085-160815-
/O.CON.KBIS.SV.W.0013.000000T0000Z-250616T0815Z/
Sioux ND-Morton ND-Grant ND-
252 AM CDT Mon Jun 16 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 AM
CDT/215 AM MDT/ FOR SIOUX...SOUTHEASTERN MORTON AND NORTHEASTERN
GRANT COUNTIES...

At 251 AM CDT/151 AM MDT/, severe thunderstorms were located along a
line extending from 5 miles northwest of Flasher to 4 miles northwest
of Solen to Prairie Knights Resort, moving northeast at 55 mph.

HAZARD...60 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Flasher, Fort Yates, Selfridge, Solen, Cannon Ball, St. Anthony,
Prairie Knights Resort, Lark, Raleigh, Breien, Hazelton Recreation
Area, Stumpf State Natural Area, Huff, Fort Rice, Standing Rock, and
Standing Rock Nation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4595 10117 4628 10105 4632 10143 4663 10136
      4664 10066 4661 10063 4659 10056 4657 10059
      4652 10054 4650 10058 4644 10060 4637 10055
      4633 10055 4628 10058 4623 10056 4613 10063
      4605 10061 4597 10051 4594 10052
TIME...MOT...LOC 0751Z 219DEG 48KT 4652 10128 4644 10086 4627 10063 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

HOLLAN

924 
WWUS53 KBIS 160815
SVSBIS

Severe Weather Statement
National Weather Service Bismarck ND
315 AM CDT Mon Jun 16 2025

NDC037-059-085-160824-
/O.EXP.KBIS.SV.W.0013.000000T0000Z-250616T0815Z/
Sioux ND-Morton ND-Grant ND-
315 AM CDT Mon Jun 16 2025

...THE SEVERE THUNDERSTORM WARNING FOR SIOUX...SOUTHEASTERN MORTON
AND NORTHEASTERN GRANT COUNTIES WILL EXPIRE AT 315 AM CDT/215 AM
MDT/...

The storms which prompted the warning have weakened below severe
limits. Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 500 AM CDT/400 AM
MDT/ for south central North Dakota.

&&

LAT...LON 4595 10117 4628 10105 4632 10143 4663 10136
      4664 10066 4661 10063 4659 10056 4657 10059
      4652 10054 4650 10058 4644 10060 4637 10055
      4633 10055 4628 10058 4623 10056 4613 10063
      4605 10061 4597 10051 4594 10052
TIME...MOT...LOC 0814Z 273DEG 45KT 4651 10088 4642 10046 4625 10023 

$$

HOLLAN

Area Forecast Discussion
National Weather Service Bismarck ND
102 AM CDT Mon Jun 16 2025

.KEY MESSAGES...

- Potential for severe storms this evening through tonight,
  with greatest chances over southwest and portions of south
  central North Dakota.

- Active pattern with periodic shower and thunderstorm chances
  during the workweek into next weekend. A few severe storms are
  possible, more notably later in the week.

- Overall temperatures remain around average for this time of
  year.

&&

.UPDATE...
Issued at 1241 AM CDT Mon Jun 16 2025

Severe thunderstorms continue to push across from eastern
Montana into western North Dakota. The main threat remains
strong winds up to 70 mph and large hail up to ping-pong size.
The CAMs show storms persisting through the night moving into
the central North Dakota by the early morning hours. The threat
will decrease to 60 mph and quarter size hail as it treks
further eastward. There remains around 1000-1500 j/kg of MUCAPE
and 40-60 kts of effective shear. Storms will continue to
organize and become more linear has the hail threat will
decrease and the wind threat will remain. The southwest has the
greatest chances for strong winds around 70 mph as the system
comes more linear.

UPDATE
Issued at 1030 PM CDT Sun Jun 15 2025

The previously warned storm moving along the International
Border, having produced hail up to the size of half-dollars and
gusts up to 60 MPH, has diminished into a cluster of sub-severe
storms. Further upstream the main line of thunderstorms has
moved in the eastern Montana, and is expected to cross into
western North Dakota over the next few hours. With MUCAPE
values broadly from 1000 to 3000 J/KG and 0 to 6 KM bulk shear
values up to around 50 to 55 knots continuing to be an analyzed
over the forecast area this evening, thus our expectation is
for these storms to persist. The evolution of these storms can
be broken into two broad segments. The northern segment,
representing the leading edge of the NE-SW orientated line of
storms, is anticipated to be picked up by an incoming cold front
moving in out of the southern Canadian Prairies early
overnight. The southern segment, associated with the low
pressure center, is expected to to continue to move eastward
across the southern half of the forecast area overnight.

Regarding forecast updates, visibility in portions of the
southern James River Valley has started to drop as low stratus
and fog begins to develop. Have started the patchy fog over
this area a little earlier than anticipated in accordance with
the latest model and satellite trends.

UPDATE
Issued at 715 PM CDT Sun Jun 15 2025

Thunderstorms have begun to develop just over far northeastern
Montana and southern Saskatchewan at the time of this early
evening update. One of these storms in particular, found just
over the border in southern Saskatchewan, have developed quite
rapidly over the past hour, with MESH values approaching
1.5-1.75 inches. That being said, with CAPE values more moderate
around 1000 J/KG compared to the strong 0-6KM BULK Shear values
approaching 40-45 knots, MESH may be overestimated. The area
these storms are developing are relatively uncapped, though CIN
increases relatively quickly the further into northwestern
North Dakota that you move. That being said, this storm will
need to be monitored as it moves into northwestern North Dakota
over the next hour or so. For updates, have opted to start
patchy fog a few hours earlier that previously forecast.

&&

.DISCUSSION...
Issued at 133 PM CDT Sun Jun 15 2025

Currently, a weak pressure pattern was situated over western and
central North Dakota. A cluster of showers and thunderstorms
have exited the James River Valley. A complex of thunderstorms
over northeast Montana this morning, has dissipated as it moved
into western ND with some remaining residual mid and high level
clouds. Outflow from this complex looks to have laid a boundary
from around Beulah/Hazen southwest through Dickinson and the
westward through Miles City. Currently western and central ND
remains quite moist with dewpoints generally in the 60s across
the forecast area. Although areas forecast soundings indicate
instability aloft, a stout cap and shortwave ridging is keeping
convection from developing. A strong shortwave is currently
pushing through Idaho and into western Montana and isolated
convection in the higher terrain of central Montana is expected
to increase over the next few hours. Thunderstorms may initially
be discrete this afternoon before more clustering and
eventually upscale growth may occur with more of a wind threat
as convection eventually moves into the Dakotas. In western and
central ND, discrete supercell storms with a threat of large
hail looks to be small, but certainly non-zero. A supercell
could be possible along the edge of the strong capping over
northwest ND, where little CIN remains. Also in the far west,
where strong heating helps to erode the CIN. CAMS have hinted at
the convection in the northwest today. The 12Z HREF does show
some longer UH tracks over northwest ND this afternoon, and a
couple UH tracks from west central into southwest ND early this
evening, before a peppering of short UH tracks that race across
the forecast area from west to east from mid-evening through
the overnight hours. This peppering is indicative of more of an
upscale growth event. However if you look closely through the
peppering, there are some hints at longer UH tracks, thus within
a linear system that looks quite possible tonight, there may be
times when supercellular characteristics emerge. Thus although
wind is likely the main threat with a linear complex if it moves
through the area, hail will also remain a threat, especially
over the west. A tornado spinup along a bowing linear segment is
also possible, but overall the tornado threat is greatest
earlier on, while convection is mostly in Montana, or if we can
get a supercell to develop late afternoon/early evening. Later
tonight, whether it's the aforementioned outflow boundary, or
an instability axis to the south along the ND/SD border, or
something else, with abundant low level moisture, steep lapse
rates, abundant bulk shear at or above 45 knots and the
approaching strong shortwave, it seems like it's not a question
of if, but moreso a question of when and where. Right now the
SPC enhanced thunderstorm risk area that extends from central
Montana into southwest ND looks to be the area of greatest
concern with convection later on. The enhances areas does extend
down to the Black Hills area of SD, so a convective complex
moving into ND is not a given, but CAMS have been pretty
consistent in bringing a complex into the western Dakotas later
this evening. The next question is how will things evolve
through the night. Some CAMS weaken convection as it pushes into
central ND while others sustain it, as it tracks across the
forecast area. With such a strong shortwave and abundant bulk
shear, think the potential for strong to severe convection to
survive as it moves across the forecast area is certainly a
possibility.

Convection may then be lingering over central and into eastern
ND as we move into Monday morning. Convection should eventually
push off to the east however Monday morning. We could also see
convection develop again Monday afternoon as the moist and
unstable airmass remains over the forecast area.

As we make our way through the week, we continue to see daily
chances for showers and thunderstorms. Although we may see a
lull in the severe activity Tuesday and Wednesday, the CSU ML
page shows the severe potential increasing again as we head into
Thursday and Friday. Temperatures through the period look to
remain near normal.

&&

.AVIATION /06Z TAFS THROUGH 06Z TUESDAY/...
Issued at 1241 AM CDT Mon Jun 16 2025

Thunderstorms and showers are forecast to move west to east
tonight into tomorrow. Thunderstorms could have gusty erratic
winds and hail. Amendments will be made for storms that develop
or move near the terminals. Low clouds will continue across the
eastern half of the state this morning clearing out later after
thunderstorms pass. Winds will veer out of the northwest as
showers and thunderstorms pass as well. Visibility reductions
are possible from heavy rain and low clouds.

&&

.BIS WATCHES/WARNINGS/ADVISORIES...
None.

&&

UPDATE...Adam/Johnson
DISCUSSION...TWH
AVIATION...Johnson

Hazardous Weather Outlook
National Weather Service Bismarck ND
1239 AM CDT Mon Jun 16 2025

NDZ004-005-013-025-170545-
Bottineau-Rolette-Pierce-Foster-
1239 AM CDT Mon Jun 16 2025

This Hazardous Weather Outlook is for portions of north central
North Dakota and southeast North Dakota.

.DAY ONE...Tonight

A few strong thunderstorms with gusty winds and small hail are
possible tonight.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

A few strong to severe storms are possible Monday into Monday
evening. Hail to the size of quarters and 60 mph wind gusts will
be the main threats.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed Monday.

NDZ003-011-012-021>023-035>037-047-048-050-051-170545-
Renville-Ward-McHenry-McLean-Sheridan-Wells-Burleigh-Kidder-
Stutsman-Logan-La Moure-McIntosh-Dickey-
1239 AM CDT Mon Jun 16 2025

This Hazardous Weather Outlook is for portions of north central
North Dakota, south central North Dakota, and southeast North
Dakota.

.DAY ONE...Tonight

Thunderstorms are expected tonight. A few storms may become
severe. Hail to the size of quarters and 60 mph wind guts will be
the main threats.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

Thunderstorms are possible Monday into Monday evening. A few
storms may become severe. Hail to the size of quarters and 60 mph
wind gusts will be the main threats.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and evening, and
again on Monday.

NDZ001-002-009-010-017>020-031>034-040>046-170545-
Divide-Burke-Williams-Mountrail-McKenzie-Dunn-Mercer-Oliver-
Golden Valley-Billings-Stark-Morton-Slope-Hettinger-Grant-Bowman-
Adams-Sioux-Emmons-
1239 AM CDT Mon Jun 16 2025 /1139 PM MDT Sun Jun 15 2025/

This Hazardous Weather Outlook is for portions of northwest North
Dakota, south central North Dakota, and southwest North Dakota.

.DAY ONE...Tonight

Thunderstorms are expected tonight. A few storms may become
severe. Hail to the size of ping-pong and 70 mph wind gust will
be the main threats.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

Thunderstorms are possible Monday into Monday evening. A few
storms may become severe. Hail to the size of quarters and 60 mph
wind gusts will be the main threats.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and evening, and
again on Monday.

Preliminary Local Storm Report
National Weather Service Bismarck ND
1243 AM CDT Mon Jun 16 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1232 AM     Tstm Wnd Gst     4 W Bowman              46.18N 103.48W
06/16/2025  M57 MPH          Bowman             ND   Mesonet

            4W Bowman NDAWN. 10 meter peak wind gust.

&&

Preliminary Local Storm Report
National Weather Service Bismarck ND
114 AM CDT Mon Jun 16 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0104 AM     Tstm Wnd Gst     11 NNE Scranton         46.28N 103.03W
06/16/2025  M59 MPH          Slope              ND   Mesonet

            3W Cedar Lake NDAWN. 10 meter peak wind.

&&

Special Weather Statement
National Weather Service Bismarck ND
114 AM CDT Mon Jun 16 2025

NDZ001>003-009>011-017-018-160645-
McKenzie ND-Mountrail ND-Divide ND-Williams ND-Ward ND-Renville ND-
Burke ND-Dunn ND-
114 AM CDT Mon Jun 16 2025

...STRONG THUNDERSTORMS WILL IMPACT NORTHWESTERN WARD...WEST CENTRAL
RENVILLE...NORTHWESTERN DUNN...SOUTHERN BURKE...EASTERN MCKENZIE...
EASTERN WILLIAMS...MOUNTRAIL AND SOUTHEASTERN DIVIDE COUNTIES THROUGH
145 AM CDT...

At 114 AM CDT, Doppler radar was tracking a cluster of strong
thunderstorms along a line extending from 6 miles east of Bowbells to
7 miles north of Four Bears Village to near Theodore Roosevelt
National Park North Unit. Movement was southeast at 20 mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Watford City, Stanley, New Town, Tioga, Kenmare, Ray, Bowbells,
Powers Lake, Arnegard, Epping, Ross, Battleview, Palermo, Lostwood,
Van Hook Park, Four Bears Village, Belden, 4 Bears Lodge, Blaisdell,
and Theodore Roosevelt National Park North Unit.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
southwestern and northwestern North Dakota.

&&

LAT...LON 4879 10178 4799 10227 4742 10316 4764 10352
      4847 10337 4883 10273
TIME...MOT...LOC 0614Z 298DEG 19KT 4879 10211 4810 10260 4760 10332

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

ADAM

Preliminary Local Storm Report
National Weather Service Bismarck ND
128 AM CDT Mon Jun 16 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0115 AM     Tstm Wnd Gst     1 WNW Hettinger         46.00N 102.65W
06/16/2025  M94 MPH          Adams              ND   Mesonet

            NW Hettinger NDAWN. 10 meter peak wind gust.

&&

Preliminary Local Storm Report
National Weather Service Bismarck ND
207 AM CDT Mon Jun 16 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0159 AM     Tstm Wnd Gst     15 SSW Leith            46.16N 101.77W
06/16/2025  M60 MPH          Grant              ND   Mesonet

            2E Pretty Rock NDAWN. 10 meter peak wind
            gust.

&&

Preliminary Local Storm Report
National Weather Service Bismarck ND
217 AM CDT Mon Jun 16 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0200 AM     Tstm Wnd Gst     15 SSW Leith            46.16N 101.77W
06/16/2025  M64 MPH          Grant              ND   Public

            2 E Pretty Rock NDAWN. 10 meter peak wind
            gust.

&&