Flash Flood Warning 39, NWS Grand Junction, CO

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Hazardous Weather Outlook
National Weather Service Grand Junction CO
319 AM MDT Mon Sep 22 2025

COZ001>014-017>023-UTZ022>025-027>029-231200-
Lower Yampa River Basin-Central Yampa River Basin-
Roan and Tavaputs Plateaus-Elkhead and Park Mountains-
Upper Yampa River Basin-Grand Valley-Debeque to Silt Corridor-
Central Colorado River Basin-Grand and Battlement Mesas-
Gore and Elk Mountains/Central Mountain Valleys-
Central Gunnison and Uncompahgre River Basin-
West Elk and Sawatch Mountains-Flat Tops-Upper Gunnison River Valley-
Uncompahgre Plateau and Dallas Divide-Northwest San Juan Mountains-
Southwest San Juan Mountains-Paradox Valley/Lower Dolores River-
Four Corners/Upper Dolores River-Animas River Basin-
San Juan River Basin-Southeast Utah-Eastern Uinta Mountains-
Eastern Uinta Basin-Tavaputs Plateau-Arches/Grand Flat-
La Sal and Abajo Mountains-Canyonlands/Natural Bridges-
319 AM MDT Mon Sep 22 2025

This Hazardous Weather Outlook is for northwest Colorado, southwest
Colorado, west central Colorado, east central Utah, northeast Utah
and southeast Utah.

.DAY ONE...Today and tonight.

Showers and a few thunderstorms this morning will become more
widespread this afternoon and evening as a cold front and upper level
trough start moving through the area. Gusty winds, small hail, and
some heavy rain will be possible under the stronger storms and
showers that form. This convection will weaken but will continue into
the overnight hours.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Some lingering showers and a few storms will be possible along the
Continental Divide Tuesday before dry air moves in for the rest of
the week. The next chance for precipitation looks to be as we head
into the weekend.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

Preliminary Local Storm Report
National Weather Service Grand Junction CO
143 PM MDT Mon Sep 22 2025

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

0128 PM     Rain             18 ESE Manila           40.88N 109.42W
09/22/2025  M0.56 Inch       Daggett            UT   Mesonet

            Mesonet station CCRU1 Cart Creek.

&&

Preliminary Local Storm Report
National Weather Service Grand Junction CO
200 PM MDT Mon Sep 22 2025

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

0126 PM     Tstm Wnd Gst     3 NW Aspen              39.23N 106.87W
09/22/2025  M46 MPH          Pitkin             CO   ASOS

&&

Preliminary Local Storm Report
National Weather Service Grand Junction CO
247 PM MDT Mon Sep 22 2025

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

0239 PM     Tstm Wnd Gst     2 E Rifle               39.53N 107.73W
09/22/2025  M45 MPH          Garfield           CO   ASOS

            ASOS station KRIL Garfield County Rgnl AP.

&&

Special Weather Statement
National Weather Service Grand Junction CO
252 PM MDT Mon Sep 22 2025

COZ001-UTZ023-024-222115-
Lower Yampa River Basin CO-Eastern Uinta Basin UT-
Eastern Uinta Mountains UT-
252 PM MDT Mon Sep 22 2025

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN MOFFAT COUNTY
THROUGH 315 PM MDT...

At 251 PM MDT, Doppler radar was tracking a strong thunderstorm near
Dinosaur, or 29 miles east of Vernal, moving east at 15 mph.

HAZARD...Wind gusts up to 40 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...
Dinosaur, Artesia, and Blue Mountain.

This includes the following highways...
 U.S. Highway 40 in Colorado between mile markers 1 and 18.
 U.S. Highway 40 in Utah between mile markers 172 and 174.
 Colorado 64 between mile markers 1 and 3.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4020 10909 4039 10911 4046 10876 4020 10872
TIME...MOT...LOC 2051Z 263DEG 13KT 4031 10901

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

DB