Alert archive / Colorado / Special Weather Statements in 2021
Special Weather Statement, NWS Grand Junction, CO
NWS Grand Junction, CO issued this special weather statement at Aug 2, 2021, 4:57 PM MDT. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 2, 2021, 4:57 PM MDT (22:57 UTC)
- Expired
- Aug 2, 2021, 5:45 PM MDT
- In force
- 48 min
- Issued by
- NWS Grand Junction, CO
The radar
The Grand Junction radar (KGJX), 169 km from the middle of the area, began a volume at 22:58 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Grand Junction, CO (KGJT), launched 12:00Z, 11.0 hours before the alert went out and 151 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 22 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 1085 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 55 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Junction, CO wrote its last area forecast discussion before this special weather statement went out at Aug 2, 4:00 PM MDT, 57 minutes earlier.
Area forecast discussion, Aug 2, 4:00 PM MDT, 57 minutes before
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</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
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Please try again in a few minutes.
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</html>Hazardous weather outlook, Aug 2, 4:34 AM MDT, 12 hours 23 minutes before
Hazardous Weather Outlook National Weather Service Grand Junction CO 434 AM MDT Mon Aug 2 2021 COZ001>014-017>023-UTZ022>025-027>029-031200- 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- 434 AM MDT Mon Aug 2 2021 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight Widespread showers and thunderstorms are expected today with the best potential of heavy rain and flash flooding over the higher terrain of western Colorado and recent burn scars as deep monsoonal moisture remains in place. Storms will continue into the overnight hours. Expect heavy rain, frequent lightning, gusty outflow winds to 40 mph and hail with stronger storms. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Scattered showers and thunderstorms can be expected each day. Moderate to heavy rain, gusty winds and lightning will be the primary threats with storms. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected today or tonight, however spotters are encouraged to relay rainfall amounts or any observed flooding to the National Weather Service in Grand Junction.
In the hours before
Local storm report, Aug 2, 11:54 AM MDT, 5 hours 3 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
1154 AM MDT MON AUG 2 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1053 AM HEAVY RAIN 3 SSE WOODY CREEK 39.23N 106.87W
08/02/2021 M0.91 INCH PITKIN CO ASOS
ASOS STATION KASE ASPEN-PITKIN CNTY AIRPORT.
0700 AM HEAVY RAIN 3 NW LAZEAR 38.82N 107.81W
08/02/2021 M0.67 INCH DELTA CO CO-OP OBSERVER
CO-OP OBSERVER STATION HCHC2 HOTCHKISS 5WNW.
0730 AM HEAVY RAIN 1 NNE CRESTED BUTTE 38.88N 106.98W
08/02/2021 M0.61 INCH GUNNISON CO CO-OP OBSERVER
CO-OP OBSERVER STATION CBUC2 0.7 NE CRESTED
BUTTE.
0600 AM HEAVY RAIN 3 N SKYWAY 39.09N 108.12W
08/02/2021 M0.58 INCH MESA CO CO-OP OBSERVER
CO-OP OBSERVER STATION MSXC2 MESA 6S.
0700 AM HEAVY RAIN 4 NNW MOUNT CRESTED BUT 38.97N 106.98W
08/02/2021 M0.50 INCH GUNNISON CO CO-OP OBSERVER
CO-OP OBSERVER STATION GTHC2 4.2 N MOUNT
CRESTED BUTTE.
0700 AM HEAVY RAIN 3 NW LAZEAR 38.81N 107.81W
08/02/2021 M0.86 INCH DELTA CO COCORAHS
COCORAHS STATION CO-DL-49 LAZEAR 3NW.
0700 AM HEAVY RAIN 4 W RIDGWAY 38.17N 107.83W
08/02/2021 M0.75 INCH OURAY CO COCORAHS
COCORAHS STATION CO-OR-21 RIDGWAY 4.1 W.
0630 AM HEAVY RAIN 4 E CHROMO 37.04N 106.76W
08/02/2021 M0.70 INCH ARCHULETA CO COCORAHS
COCORAHS STATION CO-AU-47 CHROMO 3.9 E.
0800 AM HEAVY RAIN 4 NNE POWDERHORN 38.34N 107.09W
08/02/2021 M0.70 INCH GUNNISON CO COCORAHS
COCORAHS STATION CO-GN-58 POWDERHORN 4.4NNE.
0700 AM HEAVY RAIN 3 NW LAZEAR 38.81N 107.80W
08/02/2021 M0.67 INCH DELTA CO COCORAHS
COCORAHS STATION CO-DL-16 HOTCHKISS 4.7W.
0700 AM HEAVY RAIN MONTICELLO 37.87N 109.34W
08/02/2021 M0.64 INCH SAN JUAN UT COCORAHS
COCORAHS STATION UT-SJ-5 MONTICELLO 0.3 W.
0700 AM HEAVY RAIN 3 N CEDAREDGE 38.95N 107.94W
08/02/2021 M0.64 INCH DELTA CO COCORAHS
COCORAHS STATION CO-DL-63 CEDAREDGE 3.5 N.
0700 AM HEAVY RAIN 1 WNW CHROMO 37.04N 106.84W
08/02/2021 M0.54 INCH ARCHULETA CO COCORAHS
COCORAHS STATION CO-AU-36 CHROMO 0.9 WNW.
0817 AM HEAVY RAIN 8 SE PARLIN 38.42N 106.62W
08/02/2021 M0.52 INCH GUNNISON CO COCORAHS
COCORAHS STATION CO-GN-49 DOYLEVILLE 2.1W.
0645 AM HEAVY RAIN PARACHUTE 39.45N 108.06W
08/02/2021 M0.50 INCH GARFIELD CO COCORAHS
COCORAHS STATION CO-GF-93 PARACHUTE 0.4 NNW.
0700 AM HEAVY RAIN 4 NNW MOUNT CRESTED BUT 38.96N 106.99W
08/02/2021 M0.50 INCH GUNNISON CO COCORAHS
COCORAHS STATION CO-GN-18 CRESTED BUTTE
6.2N.
&&Special weather statement, Aug 2, 2:16 PM MDT, 2 hours 41 minutes before
Special Weather Statement National Weather Service Grand Junction CO 216 PM MDT Mon Aug 2 2021 COZ019>021-UTZ028-022045- Southwest San Juan Mountains CO- Paradox Valley/Lower Dolores River CO- Four Corners/Upper Dolores River CO-La Sal and Abajo Mountains UT- 216 PM MDT Mon Aug 2 2021 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN DOLORES AND WEST CENTRAL SAN MIGUEL COUNTIES UNTIL 245 PM MDT... At 215 PM MDT, Doppler radar was tracking a strong thunderstorm 8 miles north of Dove Creek, moving east at 20 mph. Half inch hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Egnar. This includes Colorado 141 between mile markers 3 and 12. PRECAUTIONARY/PREPAREDNESS ACTIONS... Heavy rainfall is also occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3786 10906 3795 10902 3795 10877 3774 10880 TIME...MOT...LOC 2015Z 288DEG 18KT 3788 10896 Miller
Special weather statement, Aug 2, 2:49 PM MDT, 2 hours 8 minutes before
Special Weather Statement
National Weather Service Grand Junction CO
249 PM MDT Mon Aug 2 2021
COZ001-022115-
Lower Yampa River Basin CO-
249 PM MDT Mon Aug 2 2021
...SPECIAL WEATHER STATEMENT...
At 248 PM MDT, Doppler radar was tracking a strong thunderstorm 13
miles southwest of Rangely moving northeast at 15 mph.
Pea size hail and winds in excess of 30 mph will be possible with
this storm.
Locations impacted include...
Rangely.
This includes the following highways...
Colorado 64 between mile markers 14 and 16.
Colorado 139 between mile markers 61 and 70.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Heavy rainfall is also occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3985 10887 3987 10900 3991 10904 4012 10888
4001 10865
TIME...MOT...LOC 2048Z 214DEG 11KT 3994 10894
ERWLocal storm report, Aug 2, 3:43 PM MDT, 1 hour 14 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
343 PM MDT MON AUG 2 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0300 PM HEAVY RAIN 2 SSW VERNAL 40.43N 109.55W
08/02/2021 M0.52 INCH UINTAH UT PUBLIC
&&Special weather statement, Aug 2, 3:55 PM MDT, 1 hour 2 minutes before
Special Weather Statement National Weather Service Grand Junction CO 355 PM MDT Mon Aug 2 2021 COZ019-022230- Southwest San Juan Mountains CO- 355 PM MDT Mon Aug 2 2021 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL DOLORES COUNTY UNTIL 430 PM MDT... At 354 PM MDT, Doppler radar was tracking a strong thunderstorm 14 miles northeast of Dolores, moving east at 15 mph. Half inch hail and winds in excess of 40 mph will be possible with this storm. This storm will remain over mainly rural areas of central Dolores County. This includes Colorado 145 near mile marker 24. PRECAUTIONARY/PREPAREDNESS ACTIONS... Heavy rainfall is also occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3759 10841 3769 10845 3777 10828 3759 10818 TIME...MOT...LOC 2154Z 249DEG 13KT 3766 10838 Miller
Special weather statement, Aug 2, 4:57 PM MDT, 0 minutes before
Special Weather Statement
National Weather Service Grand Junction CO
457 PM MDT Mon Aug 2 2021
UTZ029-022345-
Canyonlands/Natural Bridges UT-
457 PM MDT Mon Aug 2 2021
...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN SAN JUAN COUNTY UNTIL
545 PM MDT...
At 456 PM MDT, Doppler radar was tracking a strong thunderstorm near
Canyonlands National Park, moving east at 20 mph.
Nickel size hail and winds in excess of 40 mph will be possible with
this storm.
Locations impacted include...
Canyonlands National Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Heavy rainfall is also occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3841 11000 3842 11001 3850 10979 3830 10964
3833 10996 3835 10994 3836 10995 3834 10996
3835 10998 3839 10997 3839 10999 3836 11001
3838 11001 3839 11003
TIME...MOT...LOC 2256Z 252DEG 16KT 3838 10999
MillerThe office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 8:37 PM MDT | Areal Flood Advisory | GJT | Garfield, Mesa | 3 hr |
| Aug 2, 1:17 PM MDT | Areal Flood Advisory | GJT | Mesa, Montrose | 118 min |
| Aug 2, 2:16 PM MDT | Special Weather Statement | GJT | Dolores | 29 min |
| Aug 2, 2:30 PM MDT | Flash Flood Watch | GJT | Archuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 12 more | 29 hr |
| Aug 2, 2:49 PM MDT | Special Weather Statement | GJT | Rio Blanco | 26 min |
| Aug 2, 3:55 PM MDT | Special Weather Statement | GJT | Dolores | 35 min |
| Aug 1, 6:35 PM MDT | Areal Flood Advisory | GJT | Uintah | 115 min |
| Aug 1, 6:41 PM MDT | Special Weather Statement | GJT | Uintah | 34 min |
| Aug 1, 7:03 PM MDT | Areal Flood Advisory | GJT | Grand | 3 hr |
| Aug 1, 8:56 PM MDT | Flash Flood Warning | GJT | Grand, San Juan | 109 min |
| Aug 1, 11:10 PM MDT | Flash Flood Warning | GJT | Grand, San Juan | 3 hr |
| Aug 2, 1:29 PM MDT | Areal Flood Advisory | GJT | San Juan | 2 hr |
| Aug 2, 4:37 PM MDT | Areal Flood Advisory | GJT | Uintah | 2 hr |
| Aug 2, 5:12 PM MDT | Special Weather Statement | GJT | San Juan | 48 min |
Nearby
Special Weather Statements in Colorado, 2021Every special weather statement in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.