Alert archive / Colorado / Flash Flood Warnings in 2021
Flash Flood Warning 73, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Aug 2, 2021, 8:27 PM MDT for Eagle County, Garfield County, Colorado. It was in force for 2 hr. 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, 8:27 PM MDT (02:27 UTC)
- Expired
- Aug 2, 2021, 10:30 PM MDT
- In force
- 2 hr
- 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), 107 km from the middle of the area, began a volume at 02:29 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, 2.5 hours before the alert went out and 125 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
- 146 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 2375 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -23 m²/s²
- 0-3 km storm-relative helicity
- -1 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
360
WGUS55 KGJT 030227
FFWGJT
COC037-045-030430-
/O.NEW.KGJT.FF.W.0073.210803T0227Z-210803T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Grand Junction CO
827 PM MDT Mon Aug 2 2021
The National Weather Service in Grand Junction has issued a
* Flash Flood Warning for...
The Grizzly Creek Fire Burn Area in...
Western Eagle County in west central Colorado...
East Central Garfield County in west central Colorado...
* Until 1030 PM MDT.
* At 827 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain over the eastern part of the Grizzly Creek Fire Burn
Area in the Deadhorse Creek and French Creek basins Between 0.3
and 0.6 inches of rain have fallen. 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 Dead Horse and French Creek drainages. The debris
flow can consist of rock, mud, vegetation and other loose materials.
HAZARD...Thunderstorms producing flash flooding in and around
the Grizzly Creek Fire Burn Area.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Grizzly Creek Fire Burn Area.
* Some locations that will experience flash flooding include...
Deadhorse and French Creek Basins
This includes the following highways...
Interstate 70 in Colorado between mile markers 125 and 129.
This includes the following streams and drainages...
Deadhorse and French Creeks
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Heavy rainfall will cause extensive and severe flash flooding of
creeks...streams...and ditches in the Grizzly Creek Fire Burn Area.
Severe debris flows can also be anticipated across roads. Roads and
driveways may be washed away in places. If you encounter flood
waters...climb to safety.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3965 10722 3967 10720 3965 10713 3962 10712
3961 10714 3960 10711 3958 10708 3957 10711
3955 10714 3954 10720 3954 10724 3956 10731
3963 10729 3963 10726 3964 10725
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...0.5-1 INCH IN 1 HOUR
$$
152 follow-up statements
869
WGUS75 KGJT 030333
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
933 PM MDT Mon Aug 2 2021
COC037-045-030430-
/O.CON.KGJT.FF.W.0073.000000T0000Z-210803T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Eagle CO-Garfield CO-
933 PM MDT Mon Aug 2 2021
...FLASH FLOOD WARNING FOR THE GRIZZLY CREEK FIRE BURN AREA REMAINS
IN EFFECT UNTIL 1030 PM MDT THIS EVENING FOR WESTERN EAGLE AND EAST
CENTRAL GARFIELD COUNTIES...
At 933 PM MDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain over the Grizzly Creek Fire Burn
Area. Between 0.4 and 1 inch of rain has fallen. Flash flooding is
ongoing or expected to begin shortly.
Excessive rainfall over the burn scar will result in debris flow
moving through the Glenwood Canyon near Dead Horse and French Creek
drainages. The debris flow can consist of rock, mud, vegetation and
other loose materials.
HAZARD...Thunderstorms producing flash flooding in and around the
Grizzly Creek Fire Burn Area.
SOURCE...Radar and automated gauges.
IMPACT...Flash flooding of areas in and around the Grizzly Creek
Fire Burn Area.
Some locations that will experience flash flooding include...
Deadhorse and French Creek drainages.
This includes the following highways...
Interstate 70 in Colorado between mile markers 118 and 129.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Heavy rainfall will cause extensive and severe flash flooding of
creeks...streams...and ditches in the Grizzly Creek Fire Burn Area.
Severe debris flows can also be anticipated across roads. Roads and
driveways may be washed away in places. If you encounter flood
waters...climb to safety.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3965 10722 3967 10720 3965 10713 3962 10712
3961 10714 3960 10711 3958 10708 3957 10711
3955 10714 3954 10720 3954 10724 3956 10731
3963 10729 3963 10726 3964 10725
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
15202
WGUS75 KGJT 030428
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
1028 PM MDT Mon Aug 2 2021
COC037-045-030438-
/O.EXP.KGJT.FF.W.0073.000000T0000Z-210803T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Eagle CO-Garfield CO-
1028 PM MDT Mon Aug 2 2021
...FLASH FLOOD WARNING FOR THE GRIZZLY CREEK FIRE BURN AREA WILL
EXPIRE AT 1030 PM MDT THIS EVENING 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.
A Flash Flood Watch remains in effect until 1200 AM MDT for portions
of southwest Colorado and west central Colorado.
LAT...LON 3965 10722 3967 10720 3965 10713 3962 10712
3961 10714 3960 10711 3958 10708 3957 10711
3955 10714 3954 10720 3954 10724 3956 10731
3963 10729 3963 10726 3964 10725
$$
15The office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 6:41 PM MDT | Special Weather Statement | GJT | 49 min | |
| Aug 2, 7:44 PM MDT | Areal Flood Advisory | GJT | Garfield, Mesa | 2 hr |
| Aug 2, 8:21 PM MDT | Areal Flood Advisory | GJT | Mesa | 114 min |
| Aug 2, 8:43 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 2 hr |
| Aug 3, 9:32 AM MDT | Areal Flood Advisory | GJT | Eagle | 3 hr |
| Aug 3, 12:16 PM MDT | Flash Flood Warning | GJT | San Miguel | 88 min |
| Aug 3, 2:54 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield | 111 min |
| Aug 3, 3:21 PM MDT | Flash Flood Warning | GJT | San Miguel | 104 min |
| Aug 3, 3:27 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield, Pitkin | 2 hr |
| Aug 3, 4:04 PM MDT | Special Weather Statement | GJT | San Miguel | 41 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.