Alert archive / Colorado / Flash Flood Warnings in 2021
Flash Flood Warning 37, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Jul 25, 2021, 7:39 PM MDT for Eagle County, Garfield County, Colorado. It was in force for 81 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
- Jul 25, 2021, 7:39 PM MDT (01:39 UTC)
- Expired
- Jul 25, 2021, 9:00 PM MDT
- In force
- 81 min
- Issued by
- NWS Grand Junction, CO
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Eagle County, CO, Garfield County, CO
The radar
The Grand Junction radar (KGJX), 106 km from the middle of the area, began a volume at 01:40 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 00:00Z, 1.7 hours before the alert went out and 124 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
- 126 J/kg
- Mixed-layer CIN
- -77 J/kg
- Mixed-layer LCL
- 2890 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
921
WGUS55 KGJT 260139
FFWGJT
COC037-045-260445-
/O.NEW.KGJT.FF.W.0037.210726T0139Z-210726T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Grand Junction CO
739 PM MDT Sun Jul 25 2021
The National Weather Service in Grand Junction has issued a
* Flash Flood Warning for...
The Grizzly Creek burn scar in...
Western Eagle County in west central Colorado...
East Central Garfield County in west central Colorado...
* Until 1045 PM MDT.
* At 739 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain over the Grizzly Creek Burn Scar. The expected rainfall
rate is 0.5 to 1 inch in 1 hour. Flash flooding is ongoing or
expected to begin shortly.
Excessive rainfall over the burn scar will result in debris flow
moving through the Grizzly Creek Burn Scar. The debris flow can
consist of rock, mud, vegetation and other loose materials.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding in and around the Grizzly
Creek Burn Scar.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Grizzly Creek Burn Scar.
* Some locations that will experience flash flooding include...
Glenwood Springs and Shoshone.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3956 10731 3963 10729 3963 10726 3964 10725
3965 10722 3967 10720 3965 10713 3962 10712
3961 10714 3960 10710 3958 10708 3957 10711
3955 10714 3954 10720 3954 10724
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...0.5-1 INCH IN 1 HOUR
$$
NL1 follow-up statement
257
WGUS75 KGJT 260300
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
900 PM MDT Sun Jul 25 2021
COC037-045-260310-
/O.CAN.KGJT.FF.W.0037.000000T0000Z-210726T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Eagle CO-Garfield CO-
900 PM MDT Sun Jul 25 2021
...FLASH FLOOD WARNING FOR THE GRIZZLY CREEK BURN SCAR IS CANCELLED
FOR WESTERN EAGLE AND EAST CENTRAL GARFIELD COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3956 10731 3963 10729 3963 10726 3964 10725
3965 10722 3967 10720 3965 10713 3962 10712
3961 10714 3960 10710 3958 10708 3957 10711
3955 10714 3954 10720 3954 10724
$$
NLThe office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 6:03 PM MDT | Special Weather Statement | GJT | 42 min | |
| Jul 25, 6:51 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 114 min |
| Jul 25, 7:19 PM MDT | Flash Flood Warning | GJT | Mesa | 3 hr |
| Jul 25, 8:03 PM MDT | Special Weather Statement | GJT | Mesa | 42 min |
| Jul 25, 8:42 PM MDT | Areal Flood Advisory | GJT | Mesa | 3 hr |
| Jul 25, 11:03 PM MDT | Areal Flood Advisory | GJT | Mesa | 2 hr |
| Jul 25, 11:35 PM MDT | Flash Flood Warning | GJT | Mesa | 115 min |
| Jul 26, 12:03 PM MDT | Flash Flood Watch | GJT | Delta, Dolores, Eagle, Garfield, Mesa, Moffat and 6 more | 10 hr |
| Jul 26, 4:06 PM MDT | Areal Flood Advisory | GJT | La Plata | 3 hr |
| Jul 26, 4:37 PM MDT | Areal Flood Advisory | GJT | Montezuma | 3 hr |
| Jul 26, 5:14 PM MDT | Areal Flood Advisory | GJT | Dolores | 3 hr |
| Jul 26, 5:50 PM MDT | Flash Flood Warning | GJT | Mesa, Montrose | 114 min |
| Jul 26, 5:52 PM MDT | Special Weather Statement | GJT | 38 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.