Alert archive / Colorado / Flash Flood Warnings in 2021
Flash Flood Warning 69, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Jul 31, 2021, 6:11 PM MDT for Garfield County, Mesa County, Colorado. It was in force for 109 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 31, 2021, 6:11 PM MDT (00:11 UTC)
- Expired
- Jul 31, 2021, 8:00 PM MDT
- In force
- 109 min
- 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), 48 km from the middle of the area, began a volume at 00:10 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, 0.2 hours before the alert went out and 31 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.
003
WGUS55 KGJT 010011
FFWGJT
COC045-077-010200-
/O.NEW.KGJT.FF.W.0069.210801T0011Z-210801T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Grand Junction CO
611 PM MDT Sat Jul 31 2021
The National Weather Service in Grand Junction has issued a
* Flash Flood Warning for...
The Pine Gulch Fire Burn Area in...
Southwestern Garfield County in west central Colorado...
North Central Mesa County in west central Colorado...
* Until 800 PM MDT.
* At 611 PM MDT, Emergency management reported flash flooding over
roadways and along ditches along the western portions of the Pine
Gulch Fire Burn Area. Flash flooding is ongoing.
Recent excessive rainfall over the burn scar will continue to
produce debris flow moving through the Pine Gulch Burn area. 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 Pine Gulch
Fire Burn Area.
SOURCE...Emergency management reported.
IMPACT...Life threatening flash flooding of areas in and around
the Pine Gulch Fire Burn Area.
* Some locations that will experience flash flooding include...
County Road 205 within Coal Creek Drainage, of Southwestern
Garfield and North Central Mesa Counties
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a life threatening situation. Heavy rainfall caused
extensive and severe flash flooding of creeks...streams...and
ditches on the west side of the Pine Gulch Fire Burn Area. Severe
debris flows have been observed 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 3936 10866 3937 10866 3939 10865 3940 10870
3944 10876 3943 10878 3946 10879 3951 10875
3953 10861 3951 10838 3949 10832 3942 10827
3939 10837 3937 10840 3937 10841 3936 10842
3932 10851 3929 10853 3929 10858
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
ERW1 follow-up statement
282
WGUS75 KGJT 010152
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
752 PM MDT Sat Jul 31 2021
COC045-077-010202-
/O.EXP.KGJT.FF.W.0069.000000T0000Z-210801T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield CO-Mesa CO-
752 PM MDT Sat Jul 31 2021
...FLASH FLOOD WARNING FOR THE PINE GULCH FIRE BURN AREA WILL EXPIRE
AT 8 PM MDT THIS EVENING FOR SOUTHWESTERN GARFIELD AND NORTH CENTRAL
MESA COUNTIES...
The heavy rain has ended. However, flooded washes may persist.
Please heed all road closures and evacuations.
LAT...LON 3936 10866 3937 10866 3939 10865 3940 10870
3944 10876 3943 10878 3946 10879 3951 10875
3953 10861 3951 10838 3949 10832 3942 10827
3939 10837 3937 10840 3937 10841 3936 10842
3932 10851 3929 10853 3929 10858
$$
ERWThe office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 7:00 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 2 hr |
| 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.