Alert archive / Colorado / Flash Flood Warnings in 2021
Flash Flood Warning 70, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Jul 31, 2021, 7:00 PM MDT for Garfield County, Mesa County, Colorado. It was in force for 2 hr. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 31, 2021, 7:00 PM MDT (01:00 UTC)
- Expired
- Jul 31, 2021, 9:00 PM MDT
- In force
- 2 hr
- Issued by
- NWS Grand Junction, CO
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Garfield County, CO, Mesa County, CO
The radar
The Grand Junction radar (KGJX), 45 km from the middle of the area, began a volume at 01:04 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 31, 7:06 PM MDT | FLASH FLOOD | 7 Ne Fruita, CO | FLASH FLOOD IN HUNTER CANYON 21 ROAD. ESTIMATED 8 FEET OF WATER MOVING DOWN WASH. |
| Jul 31, 7:10 PM MDT | FLASH FLOOD | 10 Nne Loma, CO | 10 FT WALL OF WATER OUTSIDE OF WASH. EVACUATIONS IN ORDER FOR HOMES ALONG 16 ROAD. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Grand Junction, CO (KGJT), launched 00:00Z, 1.0 hours before the alert went out and 22 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
- 59 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 2545 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
196
WGUS55 KGJT 010100
FFWGJT
COC045-077-010300-
/O.NEW.KGJT.FF.W.0070.210801T0100Z-210801T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Grand Junction CO
700 PM MDT Sat Jul 31 2021
The National Weather Service in Grand Junction has issued a
* Flash Flood Warning for...
Southwestern Garfield County in west central Colorado...
Northwestern Mesa County in west central Colorado...
* Until 900 PM MDT.
* At 700 PM MDT, Emergency management reported flash flooding and a
wall of water exceeding washes along 21 Road and 16 Road. Flash
flooding is already occurring.
HAZARD...Life threatening flash flooding.
SOURCE...Emergency management reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, and roadways.
* Some locations that will experience flash flooding include...
mainly rural areas of Southwestern Garfield and Northwestern Mesa
Counties along 21 Road and 16 Road Washes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Seek
higher ground.
Be aware of your surroundings and do not drive on flooded roads.
Heed all evacuations.
&&
LAT...LON 3939 10868 3939 10865 3937 10866 3936 10866
3929 10858 3929 10853 3926 10852 3920 10857
3918 10862 3920 10864 3920 10865 3920 10866
3921 10866 3921 10867 3923 10867 3926 10872
3927 10875 3929 10877 3933 10875 3936 10873
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
ERW2 follow-up statements
337
WGUS75 KGJT 010213
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
813 PM MDT Sat Jul 31 2021
COC045-077-010300-
/O.CON.KGJT.FF.W.0070.000000T0000Z-210801T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield CO-Mesa CO-
813 PM MDT Sat Jul 31 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING
FOR SOUTHWESTERN GARFIELD AND NORTHWESTERN MESA COUNTIES...
At 813 PM MDT, Emergency management reported flash flooding and a
wall of water exceeding washes along 21 Road and 16 Road. Flash
flooding continues.
HAZARD...Life threatening flash flooding.
SOURCE...Emergency management reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, and roadways.
Some locations that will experience flash flooding include...
mainly rural areas of Southwestern Garfield and Northwestern Mesa
Counties along 21 Road and 16 Road Washes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for flooding even in locations not receiving rain.
Arroyos, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
Turn around, don't drown when encountering flooded roads. Seek
higher ground.
Be aware of your surroundings and do not drive on flooded roads.
Heed all evacuations.
&&
LAT...LON 3939 10868 3939 10865 3937 10866 3936 10866
3929 10858 3929 10853 3926 10852 3920 10857
3918 10862 3920 10864 3920 10865 3920 10866
3921 10866 3921 10867 3923 10867 3926 10872
3927 10875 3929 10877 3933 10875 3936 10873
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
BWM102
WGUS75 KGJT 010305
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
905 PM MDT Sat Jul 31 2021
COC045-077-010315-
/O.EXP.KGJT.FF.W.0070.000000T0000Z-210801T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield CO-Mesa CO-
905 PM MDT Sat Jul 31 2021
...FLASH FLOOD WARNING HAS EXPIRED FOR SOUTHWESTERN GARFIELD AND
NORTHWESTERN MESA COUNTIES...
Flood waters are lowering, though washes and creeks from 16 Road to
Kimball Creek will still have higher than normal flow for several
more hours. Flooding is no longer expected to pose a threat. Please
continue to heed remaining road closures and stay away from washes
with fast flowing water.
LAT...LON 3939 10868 3939 10865 3937 10866 3936 10866
3929 10858 3929 10853 3926 10852 3920 10857
3918 10862 3920 10864 3920 10865 3920 10866
3921 10866 3921 10867 3923 10867 3926 10872
3927 10875 3929 10877 3933 10875 3936 10873
$$
BWMThe office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 6:11 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 109 min |
| Aug 1, 3:05 AM MDT | Flash Flood Watch | GJT | Archuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 12 more | 18 hr |
| Aug 1, 11:34 AM MDT | Special Weather Statement | GJT | Mesa | 26 min |
| Aug 1, 1:25 PM MDT | Flash Flood Watch | GJT | Archuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 12 more | 35 hr |
| Aug 1, 2:49 PM MDT | Areal Flood Advisory | GJT | Garfield, Mesa | 3 hr |
| Aug 1, 3:20 PM MDT | Special Weather Statement | GJT | Garfield | 40 min |
| Aug 1, 4:34 PM MDT | Areal Flood Advisory | GJT | Delta, Mesa | 116 min |
Nearby
Flash Flood Warnings in Colorado, 2021Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.