WW 629 SEVERE TSTM CO NE WY 262150Z - 270500Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 629
NWS Storm Prediction Center Norman OK
350 PM MDT Wed Aug 26 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Eastern Colorado
Nebraska Panhandle
Far Southeast Wyoming
* Effective this Wednesday afternoon and evening from 350 PM
until 1100 PM 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...Scattered severe thunderstorms are forecast to continue
through the evening across the central High Plains. A few
supercells will pose a risk for large hail (1 to 2 inches in
diameter) and isolated severe gusts. The threat for severe gusts
(60 to 75 mph) will probably increase during the evening as storms
congeal into one or two clusters.
The severe thunderstorm watch area is approximately along and 70
statute miles east and west of a line from 40 miles northeast of
Cheyenne WY to 20 miles southeast of Trinidad CO. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU9).
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 628...
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 450. Mean storm motion vector
33020.
...Smith
WW 628 SEVERE TSTM AR OK TX 262010Z - 270300Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 628
NWS Storm Prediction Center Norman OK
310 PM CDT Wed Aug 26 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Arkansas
Eastern and Southeastern Oklahoma
Far Northeast Texas
* Effective this Wednesday afternoon and evening from 310 PM
until 1000 PM CDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph possible
Isolated large hail events to 1.5 inches in diameter possible
SUMMARY...Thunderstorms are ongoing from parts of northern and
central Arkansas into far east-central Oklahoma. Thunderstorm
coverage is expected to increase in these areas this afternoon and
evening, as well as farther south in the Arklatex vicinity. Strong
to severe thunderstorms are possible, with damaging wind gusts as
the primary severe risk. Some isolated large hail is possible as
well.
The severe thunderstorm watch area is approximately along and 75
statute miles east and west of a line from 15 miles northeast of
Flippin AR to 30 miles south of Texarkana AR. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU8).
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.
&&
AVIATION...A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
36020.
...Mosier
WW 0629 Status Updates
STATUS REPORT ON WW 629
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 WSW FCL
TO 25 SSE CYS TO 20 ESE SNY.
..WEINMAN..08/27/26
ATTN...WFO...BOU...PUB...GLD...CYS...
STATUS REPORT FOR WS 629
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
COC001-005-011-013-014-017-023-025-027-031-035-039-041-043-055-
059-061-063-071-073-087-089-101-119-121-123-270240-
CO
. COLORADO COUNTIES INCLUDED ARE
ADAMS ARAPAHOE BENT
BOULDER BROOMFIELD CHEYENNE
COSTILLA CROWLEY CUSTER
DENVER DOUGLAS ELBERT
EL PASO FREMONT HUERFANO
JEFFERSON KIOWA KIT CARSON
LAS ANIMAS LINCOLN MORGAN
OTERO PUEBLO TELLER
WASHINGTON WELD
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 0628 Status Updates
STATUS REPORT ON WW 628
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 SSW DEQ
TO 25 S HOT TO 50 NNW GWO.
..LYONS..08/27/26
ATTN...WFO...LZK...TSA...SHV...
STATUS REPORT FOR WS 628
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ARC011-013-019-025-027-039-057-073-081-091-099-103-139-270340-
AR
. ARKANSAS COUNTIES INCLUDED ARE
BRADLEY CALHOUN CLARK
CLEVELAND COLUMBIA DALLAS
HEMPSTEAD LAFAYETTE LITTLE RIVER
MILLER NEVADA OUACHITA
UNION
TXC037-063-067-159-343-387-449-270340-
TX
. TEXAS COUNTIES INCLUDED ARE
BOWIE CAMP CASS
FRANKLIN MORRIS RED RIVER
TITUS
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
No Mesoscale Discussions are in effect as of Thu Aug 27 02:19:08 UTC 2026.SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0758 PM CDT Wed Aug 26 2026
Valid 270100Z - 271200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR PARTS OF THE
CENTRAL HIGH PLAINS...AND ALSO FROM THE ARKLATEX TO THE ARKLAMISS
REGIONS...
...SUMMARY...
Isolated to widely scattered strong to severe thunderstorms remain
possible tonight across parts of the central and southern High
Plains, parts of Arkansas into the lower Mississippi Valley, and
parts of the Midwest and Ohio Valley.
...Central/southern High Plains...
Widely scattered strong to severe storms are ongoing this evening
across parts of the central/southern High Plains. The most favorable
environment resides from eastern CO into western KS, with moderate
buoyancy and effective shear of 30-40 kt within a northwesterly flow
regime. The strongest discrete cells in this area will continue to
pose a threat of hail and localized severe gusts. Some modest
clustering remains possible with time, which could result in at
least an isolated severe-wind threat as convection spreads into
western KS later tonight.
Deep-layer flow/shear is generally weaker across the southern High
Plains, but localized strong to severe gusts will remain possible
within the well-mixed environment through at least dusk.
...AR into the Lower MS Valley...
Widespread deep convection from southeastern OK into
central/southern AR may eventually evolve into a loosely organized,
outflow-driven cluster with time this evening. This could result in
a threat for scattered wind damage spreading into northern LA
through the evening, with an isolated threat possible later tonight
as storms approach the LA/MS Gulf Coasts.
...Midwest/Ohio Valley...
Scattered storms are ongoing from parts of Lower MI into parts of
the Midwest/Ohio Valley. The combination of moderate buoyancy and
marginal deep-layer shear (generally 25-35 kt of effective shear)
has only been supportive of an isolated severe threat thus far. No
substantial improvement in the environment is expected through the
evening, but ongoing storms may continue to pose an isolated severe
threat before convection generally subsides later tonight.
..Dean.. 08/27/2026
SPC Day 3-8 Fire Weather Outlook
Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0453 PM CDT Wed Aug 26 2026
Valid 281200Z - 031200Z
...Synopsis...
An upper ridge currently centered over the Four Corners region will
begin to gradually translate eastward towards the Southeast this
weekend, while a series of shortwave troughs impact the Pacific
Northwest. Strong southwest-westerly flow will continue across the
northwestern CONUS into early next week, with embedded disturbances
within persistent upper troughing and along the northern periphery
of the flattening ridge. Long term guidance suggests these
shortwaves will contribute to the breakdown of the upper ridge,
shunting monsoonal moisture to the south and east. However,
increasing moisture influence from ingested tropical remnants in the
Pacific could support thunderstorm chances out West this weekend,
though confidence remains low. As a result of the upper pattern,
fire weather concerns will likely continue through the forecast
period across the parts of the Northwest, Great Basin and Northern
Rockies. However, low predictability and poor agreement among
ensemble clusters precludes additional probabilities beyond Day
6/Monday.
...Northwest, Northern Great Basin and Northern Rockies...
Drier southwest flow aloft associated with perpetual troughing over
the northwest CONUS will promote continued fire weather concerns
into early next week. 40% Critical probabilities have been
maintained with minor adjustments for Days 3-4/Friday-Saturday, and
introduced across northeastern California, northwestern Nevada, and
southeastern Oregon on Day 6/Monday. West to southwest winds of
15-20 mph and afternoon relative humidity of 15-20 percent will
bring daily elevated fire weather concerns, potentially impacting
nascent wildfires born from thunderstorm activity early in the
forecast period (especially across northwest/north-central Montana
on Day 3/Friday). Despite decreasing high temperatures (as compared
to the previous week) with the much anticipated departure of
large-scale upper ridging, breezy winds and low RH will preserve a
very dry fuelscape.
...Southern California...
Above average daytime temperatures and poor humidity recoveries are
forecast across portions of southern California through the early
weekend. Offshore flow will present overnight/early morning periods
of gusty winds and critically low RH values in Santa
Barbara/Ventura/LA counties amid very dry fuels, raising concerns
for locally elevated fire weather conditions. As such, 40% Critical
probabilities were maintained on Day 3/Friday, but withheld for Day
4/Saturday due to uncertainty in the strength of the offshore
pressure gradient.
..Elizalde-Garcia.. 08/26/2026
...Please see www.spc.noaa.gov/fire for graphic product...
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