RSS Mesoscale Discussions from Storm Prediction Center
WW 283 SEVERE TSTM MT ND 070035Z - 070800Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 283
NWS Storm Prediction Center Norman OK
635 PM MDT Sat Jun 6 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Eastern Montana
Western North Dakota
* Effective this Saturday night and Sunday morning from 635 PM
until 200 AM MDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 75
mph possible
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
SUMMARY...A mix of high-based supercells and multicells should pose
a threat for large hail up to 1-2 inches in diameter and
severe/damaging winds around 60-75 mph this evening and through the
early overnight hours as this activity moves northeastward.
The severe thunderstorm watch area is approximately along and 125
statute miles east and west of a line from 25 miles south of Miles
City MT to 70 miles north northeast of Wolf Point MT. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU3).
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 279...WW 281...WW 282...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
21040.
...Gleason
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WW 0283 Status Updates
STATUS REPORT ON WW 283
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 60 WSW MLS
TO 40 S GGW TO 20 N OLF TO 90 NNE OLF.
..WENDT..06/07/26
ATTN...WFO...BYZ...GGW...BIS...
STATUS REPORT FOR WS 283
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC017-019-021-025-033-055-079-083-085-087-091-109-070640-
MT
. MONTANA COUNTIES INCLUDED ARE
CUSTER DANIELS DAWSON
FALLON GARFIELD MCCONE
PRAIRIE RICHLAND ROOSEVELT
ROSEBUD SHERIDAN WIBAUX
NDC007-011-013-023-033-053-061-087-105-070640-
ND
. NORTH DAKOTA COUNTIES INCLUDED ARE
BILLINGS BOWMAN BURKE
DIVIDE GOLDEN VALLEY MCKENZIE
MOUNTRAIL SLOPE WILLIAMS
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.
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No Mesoscale Discussions are in effect as of Sun Jun 7 08:44:08 UTC 2026.
SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1246 AM CDT Sun Jun 07 2026
Valid 071200Z - 081200Z
...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
THE NORTHERN PLAINS...
...SUMMARY...
Severe thunderstorms with large hail, damaging wind gusts and an
isolated tornado threat are expected today across parts of the
northern Plains. An isolated threat for tornadoes and severe wind
gusts will be possible from parts of eastern Oklahoma and
southeastern Kansas eastward across the Ozarks. Strong wind gusts
will also be possible in the mid Mississippi Valley and in the
Mid-Atlantic.
...Northern Plains...
An upper-level trough will move eastward across the northern Rockies
today. Ahead of the trough, mid-level heights will gradually fall
across the northern Plains. At the surface, a trough of low pressure
will deepen in the western Dakotas as a cold front advances eastward
across the northern High Plains. Surface dewpoints near the surface
trough will be in the lower to mid 60s F which will enable moderate
instability to develop around midday. During the afternoon,
thunderstorms are expected to form along the front and further east
near the surface trough as low-level convergence increases. Although
cells will initially be discrete, convection is expected to grow
upscale into a line during the evening.
At 21Z, RAP forecast soundings near the surface trough in western
North Dakota have 0-6 km shear in the 40 to 50 knot range with
700-500 mb lapse rates near 8.5 C/km. This environment will be
favorable for supercells with large hail. The more dominant
supercells may be capable of producing hailstones greater than 2
inches in diameter. Low-level shear may be strong enough for an
isolated tornado threat as well. Supercells will be favored in the
late afternoon when cells will likely be discrete. In the early
evening, a quick transition to linear mode is expected, although
rotating elements will continue to be possible in the line itself.
As the line develops, severe wind gusts will become more likely.
Intense parts of the line could be capable of producing wind gusts
above 75 mph.
...Eastern Oklahoma/Southeast Kansas/Ozarks/Mid Mississippi
Valley...
An upper-level trough will move northeastward across the central
U.S. today, over the top of a moist and unstable airmass. Surface
dewpoints from eastern parts of the southern and central Plains into
the mid Mississippi Valley will be in the upper 60s and lower 70s F.
This will contribute to the development of moderate instability by
afternoon. Random areas of maximized low-level convergence are
expected this afternoon which will lead to the formation of
scattered thunderstorms. Deep-layer shear of 25 to 30 knots should
be sufficient for isolated supercells. Storm-relative helicity could
reach 200 m2/s2 in a few areas, which would support an isolated
tornado threat. Strong wind gusts will also be possible with this
threat extending eastward into the mid Mississippi Valley. The
wind-damage threat will be greatest in the mid to late afternoon as
low-level lapse rates become steep.
...Mid-Atlantic...
An upper-level trough and an associated cold front will move across
the Mid-Atlantic today. Ahead of the front, surface dewpoints in the
mid 60s F will contribute to moderate instability by afternoon.
Thunderstorms will develop near and to the south of the front during
the mid to late afternoon. RAP forecast soundings ahead of the front
suggest that 0-3 km lapse rates will peak near 8 C/km, which should
support a potential for isolated severe wind gusts.
..Broyles/Supinie.. 06/07/2026
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SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1258 AM CDT Sun Jun 07 2026
Valid 081200Z - 091200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER SOUTHEAST
WYOMING...NORTHEAST COLORADO...AND THE SOUTHERN NEBRASKA
PANHANDLE...
...SUMMARY...
Isolated to widely scattered severe storms capable of large to very
large hail and perhaps a brief tornado or two are possible Monday
afternoon and evening in northeast Colorado, southeast Wyoming, and
the southern Nebraska Panhandle. Additional, more isolated
occurrences of large hail and damaging winds will be possible from
the Canadian border into the Oklahoma and Texas Panhandles. Sporadic
damaging winds may occur from the Ozark Plateau into the Mid-south.
...Synopsis...
A mid-level jet streak and associated channeled vorticity maximum
initially from the northern Rockies into northern High Plains will
lift northeast into Manitoba, ahead of an amplifying short-wave
trough moving through the Pacific Northwest into northern Rockies.
Elsewhere, loosely organized troughing initially along the MS Valley
will shift northeast into the Great Lakes and OH Valley.
At the surface, a front initially stretching from the central
Dakotas to low pressure over western KS is expected to weaken
through the day in response to falling pressures across the northern
Rockies. A weak cyclone is expected to persist over southwest KS or
northwest OK, with a dryline extending southwest into western TX.
...Great Plains...
With the early-day passage of the lead short-wave trough through the
northern High Plains, mid-level heights may rebound slightly during
the afternoon, with negligible forcing for ascent indicated in model
guidance. As such, the most probable location for isolated to widely
scattered severe-storm development appears to be along favored
terrain from north of the Palmer Divide to along the Cheyenne Ridge.
There, moist upslope flow will become established by afternoon,
beneath a plume of steep lapse rates, yielding MLCAPE of 1000-1500
J/kg. Vertical shear is expected to strengthen through the day with
effective bulk shear increasing to around 50 kt by late afternoon
into early evening. As such, the potential will exist for supercells
capable of large to very large hail and perhaps a brief tornado or
two. The severe-threat may move into the adjacent High Plains Monday
evening before the storms weaken.
Across the lower elevations of the Plains there is considerably more
model spread in the timing and location of storms through the
forecast period, likely as a result of the weak forcing. The
residual surface front from eastern SD through central NE into
western KS, and south along the dryline into the OK/TX Panhandles
will be viable locations for diurnally enhanced storms amidst a
moderate to strongly unstable air mass. As such, isolated
occurrences for large hail and severe wind gusts will be possible.
Stronger deep-layer shear is forecast from northern KS into the
northern Plains, which may support a longer-lived, more organized
storm threat. However, given the model variability mentioned above,
no additional level 2/Slight Risk areas will be highlighted with
this forecast.
Finally, it appears a separate, elevated thunderstorm regime could
materialize early Tuesday morning from parts of eastern MT through
northern ND, where some large hail threat could develop.
...Ozark Plateau into the Mid-South...
A number of models indicate the potential for a complex of
thunderstorms to be ongoing Monday morning across portions of the
Ozark Plateau, aided by low-level warm advection along a modest
low-level jet. That activity is expected to continue east/southeast
through the day, with some potential for cold pool organization and
related damaging wind potential as the system encounters a moist and
moderately unstable air mass.
..Mead.. 06/07/2026
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SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0222 AM CDT Sun Jun 07 2026
Valid 091200Z - 101200Z
...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS OVER CENTRAL
NORTH DAKOTA AND NORTH-CENTRAL SOUTH DAKOTA...
...SUMMARY...
Scattered to numerous severe thunderstorms are expected to develop
across portions of the northern Plains into Upper Mississippi Valley
Tuesday afternoon into night. All severe-weather hazards are
possible. Isolated to widely scattered severe storms may also occur
across the central Plains, with a risk for large hail and damaging
winds.
...Synopsis...
A short-wave trough and attending mid/upper-level jet streaks over
the northern Rockies Tuesday morning will overspread the northern
Plains by afternoon. Farther upstream, a significant short-wave
trough will assume an increasing negative tilt while translating
into the northern High Plains early Tuesday morning. At the surface,
a cyclone linked with the lead short-wave trough will deepen while
developing from southeast MT into western ND by afternoon.
Meanwhile, an associated Pacific front will push east into the
western Dakotas, with more of a dryline structure evident from
southwest NE into the OK and TX Panhandles.
...Northern and Central Plains into Upper Mississippi Valley...
An active severe-weather period is anticipated Tuesday afternoon
into night, especially across the northern Plains, where all
severe-weather hazards are possible.
While the pre-frontal air mass over the western Dakotas is not
expected to be overly moist with dewpoints in the 50s to low 60s,
strong daytime heating and steep mid-level lapse rates will
contribute to moderate to strong instability by mid to late
afternoon. Some potential for early-day storms will exist in
northern ND, within a zone of persistent warm advection. Additional,
more intense thunderstorm activity is expected by mid afternoon from
the southern fringe of the early-day convection south along the
front as forcing for ascent increases with the approach of the
short-wave trough.
Vertically veering wind profiles with 40-50+ kt of deep-layer shear
will favor supercells capable of large to very large hail initially.
Some tornado threat could materialize during the evening hours as
LCL heights lower and the low-level shear increases. With time,
storms may grow upscale into clusters, with an increasing risk for
damaging winds spreading east through the Red River Valley.
Farther south, a number of models develop isolated to widely
scattered storms during the afternoon along the dryline in western
KS amidst a marginally sheared, but moderate to strongly unstable
environment. There is some signal that an MCS could evolve from that
activity across the mid to lower MO Valley Tuesday evening. Only 5%
total-severe probabilities will be added in those areas, due to
uncertainty in that scenario.
..Mead.. 06/07/2026
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Day 4-8 Outlook
Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0341 AM CDT Sun Jun 07 2026
Valid 101200Z - 151200Z
...DISCUSSION...
...Day4/Wednesday...
A concentrated area of potentially significant severe weather is
expected Wednesday afternoon and evening, centered across portions
of Minnesota, Wisconsin, and Iowa.
A number of the deterministic models have trended slightly faster
with the progression of a lead short-wave trough and associated jet
streak through the northern Plains into upper MS Valley. At the
surface, low pressure initially over eastern SD is forecast to
develop northeast along a cold front moving from the eastern Dakotas
into MN. The trailing extension of the boundary is expected to move
more slowly into the mid MO Valley before stalling in response to a
deepening cyclone over the central High Plains.
Steep lapse rates and a very moist boundary layer will contribute to
moderate to strong instability across the warm sector, with initial
storms potentially developing by early afternoon from the Red River
Valley into central MN. Subsequent storms are likely to develop
across southern MN into IA and northern MO by mid to late afternoon.
The models indicate 40+ kt deep-layer shear across the warm sector,
supportive of supercells and bowing structures, capable of all
severe-weather hazards. The severe-weather threat is expected to
spread east through the upper Midwest during the evening hours.
...Day 5/Thursday...
Both the ensemble mean and deterministic models indicate the
development of a prominent mid-level low over Manitoba or northwest
Ontario, with a potent short-wave trough moving through the base of
that feature from the upper MS Valley through the upper Great Lakes.
A belt of unseasonably strong mid-level winds will attend the
short-wave trough from the central Plains into upper Great Lakes. At
the surface, ensemble member clustering and the deterministic models
indicate the primary low pressure over Ontario, with some signal for
a secondary cyclone/frontal wave developing from the mid MO Valley
into upper Midwest during the day. The associated surface front is
forecast to advance through the upper Midwest into upper Great
Lakes, with the trailing extension of the boundary moving into the
mid MS Valley and southern Plains.
The presence of moderate to strong instability across the
pre-frontal warm sector suggests the potential for severe storms
from the upper Midwest into southern Plains. Within that broader
envelope, a potentially more concentrated area of severe weather may
materialize from parts of the upper Midwest into mid MS Valley
during the afternoon and evening hours. There, the most favorable
overlap of the forcing for ascent, sufficient vertical shear, and
ample instability are expected to reside.
...Day 6/Friday...
The ensembles and majority of deterministic models indicate the
Day5/Thursday upper Great lakes short-wave trough will lift
northeast into Ontario and Quebec. At the surface, the models
suggest that a weakening cold front will advance into the Northeast
and through the OH Valley. Some severe-weather threat could develop
along the front by afternoon; however, the models suggest that the
boundary will become increasingly displaced from the strongest
mid-level winds and associated vertical shear. Isolated severe
storms also appear possible in the vicinity of a deepening lee
cyclone over the central High Plains.
...Days 7-8/Saturday and Sunday...
The ensemble mean solutions indicate some potential for mid-level
troughing to develop from the northern Rockies into northern Plains
next weekend, which is supported by a number of the deterministic
models. At the surface, there are indications that a frontal system
may stretch from the upper Midwest or Great Lakes into central High
Plains, where some severe-weather threat could develop.
Read more
SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0121 AM CDT Sun Jun 07 2026
Valid 071200Z - 081200Z
...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE SOUTHWEST...GREAT
BASIN...CENTRAL ROCKIES...
...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF SOUTHERN IDAHO...
...Synopsis...
A longwave mid-level trough will remain situated over the
northwestern CONUS through the day on Sunday, with a shortwave
trough moving across the northern Rockies. The attendant surface low
and cold front will result in breezy conditions across portions of
the Great Basin, southwestern CONUS, and northern Rockies with low
RH values and critically dry fuels.
...Southwest, Great Basin, and Central Rockies...
Ahead of the cold front, strong vertical mixing and a tight pressure
gradient will result in gusty winds to 25-35 mph along with 5-15%
RH. Poor overnight RH recovery across much of the area is expected
to contribute to critically dry fuels across the region. For these
reasons, a Critical area has been maintained in this outlook.
Additionally, the cold front may provide enough lift and mid-level
moisture for thunderstorm development across portions of Utah to
central Wyoming. Given low precipitable water values and relatively
fast storm motions, some Isolated Dry Thunder may occur in this
region.
...Snake River Plain...
Beneath the departing mid-level jet max, a relatively localized area
of Critical conditions is expected in the Snake River Plain in Idaho
colocated. Here, strong vertical mixing will result in winds of
25-35 mph along with 10-15% RH. Dry fuels in this region mean that a
Critical area is warranted.
..Supinie.. 06/07/2026
...Please see www.spc.noaa.gov/fire for graphic product...
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SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0122 AM CDT Sun Jun 07 2026
Valid 081200Z - 091200Z
...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE SOUTHWEST...GREAT
BASIN...CENTRAL ROCKIES...
...Synopsis...
A longwave trough will remain over the northwestern CONUS through
the day on Monday, and a shortwave trough will dig across the
northern Rockies and Great Basin. This will result in breezy
conditions across portions of the Great Basin and the Southwestern
CONUS with low RH in place and dry fuels.
...Southwest, Great Basin, and central Rockies...
Strong vertical mixing during the afternoon with modest flow aloft
is expected to result in winds of 20-30 mph along with RH near 5-15%
for several hours across this region. Continued poor RH recovery
overnight will contribute to dry fuels. Therefore, a Critical area
is introduced across the area. Surrounding this is an Elevated area,
where winds are generally expected to be near 15-20 mph with 5-15%
RH and receptive fuels.
...Central High Plains...
Upslope flow may provide the lift for convective development Monday
afternoon in the presence of a relatively dry boundary layer.
Precipitable water and storm motions may be a bit marginal, but it
appears a mix of wet and dry thunderstorm activity may occur, which
warrants an Isolated Dry Thunder area.
..Supinie.. 06/07/2026
...Please see www.spc.noaa.gov/fire for graphic product...
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