WW 427 SEVERE TSTM MN NE SD 010505Z - 011100Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 427
NWS Storm Prediction Center Norman OK
1205 AM CDT Wed Jul 1 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southwest Minnesota
Extreme northeast Nebraska
Southeast South Dakota
* Effective this Wednesday morning from 1205 AM until 600 AM CDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 75
mph possible
Isolated large hail events to 1 inch in diameter possible
SUMMARY...A storm cluster with a history of severe gusts in Nebraska
will continue northeastward into southeast South Dakota and
southwest Minnesota through the early morning hours. Thunderstorm
gusts of 60-75 mph will be the main threat, though isolated large
hail near 1 inch in diameter will also be possible.
The severe thunderstorm watch area is approximately along and 65
statute miles east and west of a line from 15 miles north of
Brookings SD to 85 miles southwest of Mitchell SD. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU7).
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 426...
AVIATION...A few severe thunderstorms with hail surface and aloft to
1 inch. Extreme turbulence and surface wind gusts to 65 knots. A few
cumulonimbi with maximum tops to 550. Mean storm motion vector
24035.
...Thompson
WW 426 SEVERE TSTM CO NE 010110Z - 010700Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 426
NWS Storm Prediction Center Norman OK
810 PM CDT Tue Jun 30 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Extreme northeast Colorado
Southwest into north central Nebraska
* Effective this Tuesday night and Wednesday morning from 810 PM
until 200 AM CDT.
* Primary threats include...
Scattered damaging winds likely with isolated significant gusts
to 80 mph possible
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
SUMMARY...Thunderstorms are beginning to intensify in extreme
northeast Colorado. The initial, more discrete storms could be
supercells with 1-2 inch diameter hail. Upscale growth into a
cluster is likely through early tonight with an increasing threat
for 60-80 mph outflow winds across Nebraska, as well as at least
isolated large hail.
The severe thunderstorm watch area is approximately along and 60
statute miles east and west of a line from 20 miles west of Imperial
NE to 30 miles northeast of Ainsworth NE. For a complete depiction
of the watch see the associated watch outline update (WOUS64 KWNS
WOU6).
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 424...WW 425...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 70 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
24030.
...Thompson
WW 0427 Status Updates
STATUS FOR WATCH 0427 HAS NOT BEEN ISSUED YET
WW 0426 Status Updates
STATUS REPORT ON WW 426
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 W IML TO
40 NNW IML TO 50 ENE SNY.
..KERR..07/01/26
ATTN...WFO...BOU...LBF...
STATUS REPORT FOR WS 426
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NEC005-009-015-017-029-031-041-063-071-075-085-089-091-101-103-
111-113-115-117-135-149-171-183-010540-
NE
. NEBRASKA COUNTIES INCLUDED ARE
ARTHUR BLAINE BOYD
BROWN CHASE CHERRY
CUSTER FRONTIER GARFIELD
GRANT HAYES HOLT
HOOKER KEITH KEYA PAHA
LINCOLN LOGAN LOUP
MCPHERSON PERKINS ROCK
THOMAS WHEELER
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.
WW 0425 Status Updates
STATUS REPORT ON WW 425
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 ESE CVS
TO 40 NW CDS TO 20 SSE HLC TO 15 SSW MCK.
REMAINING VALID PORTION OF WW MAY BE ALLOWED TO EXPIRE AT 01/03Z.
..KERR..07/01/26
ATTN...WFO...PUB...GLD...DDC...AMA...LUB...
STATUS REPORT FOR WS 425
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
KSC039-051-065-135-137-179-195-010300-
KS
. KANSAS COUNTIES INCLUDED ARE
DECATUR ELLIS GRAHAM
NESS NORTON SHERIDAN
TREGO
TXC011-017-045-069-079-129-153-189-219-279-303-369-437-010300-
TX
. TEXAS COUNTIES INCLUDED ARE
ARMSTRONG BAILEY BRISCOE
CASTRO COCHRAN DONLEY
FLOYD HALE HOCKLEY
LAMB LUBBOCK PARMER
SWISHER
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
No Mesoscale Discussions are in effect as of Wed Jul 1 06:11:08 UTC 2026.SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0100 AM CDT Wed Jul 01 2026
Valid 011200Z - 021200Z
...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS
OF THE MIDWEST INTO THE UPPER GREAT LAKES...
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF
THE CENTRAL HIGH PLAINS AND THE NORTHEAST...
...SUMMARY...
Scattered severe thunderstorms are forecast across the Upper
Midwest/Great Lakes today and tonight. Damaging wind gusts (some to
80 mph) are the main concern, in addition to isolated large to very
large hail and a few tornadoes. Additional severe storms are
possible across parts of the the central High Plains and Northeast.
...Midwest and Upper Great Lakes ...
Within a belt of strong midlevel southwesterly flow extending from
the central/northern Plains into the Upper Midwest/Great Lakes, a
convectively augmented midlevel impulse should be the focus for
ongoing/morning strong-severe storms over parts of southern MN and
vicinity. This activity will mainly pose a risk for damaging gusts
and possibly large hail. These storms should continue
developing/spreading east-northeastward into the Upper Midwest along
a stationary boundary, where diurnal heating of a moist air mass and
steep lapse rates will lead to strong surface-based buoyancy. This,
combined with around 40 kt of effective shear, will favor a mix of
supercells and organized clusters. Scattered damaging wind gusts,
large to very large hail, and a few tornadoes will all be possible.
Thereafter, high-resolution guidance is in general agreement,
depicting a second round of upstream thunderstorm development during
the afternoon/evening in the vicinity of southern MN -- likely in
response to a strengthening low-level jet and related isentropic
lift. Similarly, these storms should spread east-northeastward
through a strongly unstable air mass and 40-50 kt of effective shear
(with increasing clockwise-curved hodographs). Swaths of damaging
winds (some gusts near 80 mph possible), large to very large hail,
and a few tornadoes will be possible.
...Central High Plains...
High-based thunderstorm development is expected along a
north/south-oriented lee trough/dryline during the afternoon and
evening. Despite modest deep-layer shear (around 25-30 kt), steep
low/mid-level lapse rates will contribute to a strongly unstable air
mass. A mix of loosely organized clusters and possibly some
supercell structures will be capable of producing severe wind gusts
and large hail.
...Northeast...
Enhanced west-northwesterly midlevel flow will persist across the
Northeast, where a warm/moist air mass will contribute to around
3000 J/kg MLCAPE. While nebulous mesoscale forcing for ascent casts
uncertainty on overall convective coverage and evolution, the strong
buoyancy and a veering wind profile (albeit modest deep-layer shear)
will favor east-southeastward-spreading convection capable of
damaging wind gusts and isolated hail during the afternoon and again
during the evening/nighttime hours.
...Southeast...
Along the southern periphery of a midlevel anticyclone centered over
the central Appalachians, a belt of 20-30-kt east-southeasterly flow
in the 700-500-mb layer will overspread a hot/moist air mass with
4500 J/kg MLCAPE during the afternoon. Despite limited deep-layer
shear, the extreme buoyancy and well-mixed boundary layer will be
favorable for wet microbursts with the stronger convective clusters
that evolve.
...Northern Rockies/High Plains...
Isolated to widely scattered thunderstorms are expected ahead of a
slow-moving midlevel trough moving across the Northwest. Preceding
the trough, around 40 kt of midlevel southwesterly flow and a weakly
unstable air mass will support a couple loosely organized clusters
capable of producing severe wind gusts during the afternoon and
evening.
..Weinman/Chalmers.. 07/01/2026
SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
0101 AM CDT Wed Jul 01 2026
Valid 021200Z - 031200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM THE NORTHERN
PLAINS INTO THE UPPER MIDWEST...
...SUMMARY...
Strong to severe storms will be possible from the northern Plains
into the Midwest and Great Lakes regions on Thursday. Isolated
strong to severe storms may also occur in the Tennessee
Valley/Southeast as well as parts of the Northeast.
...Northern Plains into Mid-Missouri Valley...
Broad cyclonic flow aloft across the Rockies will promote a lee
trough and a modest surface low in the vicinity of the Black Hills.
A surface boundary will arc from eastern Montana into northern South
Dakota and southern Minnesota. Moisture advection into the High
Plains will couple with higher terrain of MT/WY/SD as well as the
surface boundary to initiate convection during the afternoon.
Supercells will be likely initially with an attendant risk of large
to very-large hail, severe winds, and a tornado or two. Mid-level
lapse rates of 8-9 C/km will promote rapid intensification and
strong downdrafts. Couple this with modest effective shear of 40-45
kt and upscale growth will be likely with time. An MCS is possible
and would likely track along the surface boundary. Wind gusts of 75+
mph would be possible with this activity.
While most guidance does not show development along the surface
boundary towards the mid-Missouri Valley, there will be weak warm
advection ongoing through the day that will increase by late
afternoon. Should storms develop here, they would likely be more
isolated/cellular. A similar threat for large/very-large hail and
severe gusts would exist along with a locally greater tornado
threat. This would especially be the case if storms can remain
discrete into the evening when low-level shear increases. Depending
on whether this activity develops/evolves, this will have an impact
on the spatial extent of a greater threat for severe winds into the
evening and beyond. Given that uncertainty, the Slight Risk will be
maintained with potential increases in wind probabilities in
subsequent outlooks as confidence increases.
...Midwest...
Convection is expected to be ongoing in parts of the region. At
least an isolated threat for damaging winds and large hail would
exist with this activity. There remain some potential for
intensification to occur as storms move east during the day. The
Slight Risk remains in place into far western Lower Michigan to
account for this potential. Later in the afternoon, redevelopment is
possible along the outflow from earlier activity. The most robust
model signals are in Iowa and parts of Wisconsin. Large hail would
be possible especially in Iowa where mid-level lapse rates would be
steeper. Otherwise damaging winds would be the main threat. A
tornado or two could occur, but low-level shear will be rather weak.
...Northeast...
Strong buoyancy and modest shear will again be in place across the
region. At least isolated storms are possible during the afternoon.
Damaging winds should be the main threat with this activity.
Isolated large hail may occur with the strongest storms, but modest
mid-level lapse rates will limit this threat. Some guidance does
show more organized activity moving into the region from
Ontario/Quebec, but this may not occur until late afternoon.
Confidence in that scenario occurring is too low for an increase in
wind probabilities.
...Tennessee Valley/Southeast...
Strong heating of a very moist airmass will promote scattered to
numerous storms during the afternoon. Congealing outflows will help
to organize activity even with very weak shear. Given mid-level
lapse rates of 7-7.5 C/km, at least marginally severe storms will be
possible. Damaging winds are the expected hazard.
..Wendt.. 07/01/2026
SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0107 AM CDT Wed Jul 01 2026
Valid 011200Z - 021200Z
...CRITICAL FIRE WEATHER AREA FOR WESTERN/SOUTHERN
COLORADO...NORTHWEST NEW MEXICO...NORTHEAST ARIZONA...AND EASTERN
UTAH...
...Synopsis...
Upper-level troughing will continue over the West with weaker
shortwave troughs rotating through. Mid-level southwest flow of
25-40 knots is expected across the Four Corners region with a very
dry airmass remaining in place.
...Greater Four Corners Region...
Sustained southwest winds of 12-20 mph with gusts of 20-35 mph amid
minimum RH of 3-15% will develop from late morning into the evening
across the greater Four Corners region. Steep low-level lapse rates
and deep boundary layer mixing will allow for gusty winds to descend
to the surface, while cross mountain flow will also allow for
stronger downslope winds on lee slopes across the region. Continued
poor overnight RH recovery will aid in longer burn periods with 7 to
15 hours of elevated/critical fire weather conditions. The Critical
area may have more locally critical conditions rather than critical
conditions based strictly on SPC's criteria. However, given the
expected duration of the elevated/locally critical conditions,
several consecutive days of dry/windy conditions, very to record dry
fuels, and recent significant fire activity, the Critical area was
expanded.
...Western Great Basin...
Locally elevated conditions are expected across southern Nevada
extending to the eastern slopes of the southern Sierra and possibly
into central and northeast Nevada. Additionally, high-based showers
and thunderstorms are possible across portions of northeast Nevada
and northwest Utah. There is uncertainty regarding thunderstorms
developing over receptive fuels, but a storm or two developing over
areas with ERCs exceeding the 80th percentile cannot be ruled out.
..Nauslar.. 07/01/2026
...Please see www.spc.noaa.gov/fire for graphic product...
SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0109 AM CDT Wed Jul 01 2026
Valid 021200Z - 031200Z
...CRITICAL FIRE WEATHER AREA FOR EASTERN UTAH...WESTERN/SOUTHERN
COLORADO...AND NORTH-CENTRAL NEW MEXICO...
...Synopsis...
Upper-level troughing will continue over the West, with southwest
mid-level flow of 20-35 knots continuing over the greater Four
Corners region. While upper-level troughing will continue, heights
will rise slightly over much of the Intermountain West. Weak lee
troughing will also continue on the High Plains.
...Greater Four Corners Region...
Another day of dry/windy conditions will develop across the greater
Four Corners region. South-southwest sustained winds of 12-20 mph
with gusts of 20-35 mph amid minimum RH of 3-15% is expected as
elevated/locally critical conditions begin by late morning and
continue into the evening. Poor RH recovery and the 6-14 hours of
elevated to critical fire weather conditions will lead to extended
burn periods again as the very to record dry fuels continue to cure.
Isolated high-based showers and thunderstorms are likely across
portions of northeast Nevada and northwest Utah. However,
uncertainty remains on if thunderstorms will develop far enough
south over more receptive fuels, thus precluding introducing an
IsoDryT area for now.
..Nauslar.. 07/01/2026
...Please see www.spc.noaa.gov/fire for graphic product...
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