Alert archive / Colorado / Flash Flood Warnings in 2021
Flash Flood Warning 78, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Aug 3, 2021, 3:27 PM MDT for Eagle County, Garfield County, Pitkin 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 3, 2021, 3:27 PM MDT (21:27 UTC)
- Expired
- Aug 3, 2021, 5:30 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, Pitkin County, CO
The radar
The Grand Junction radar (KGJX), 107 km from the middle of the area, began a volume at 21:30 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, 9.5 hours before the alert went out and 128 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
- 5 J/kg
- Mixed-layer CIN
- -176 J/kg
- Mixed-layer LCL
- 1792 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
279
WGUS55 KGJT 032127
FFWGJT
COC037-045-097-032330-
/O.NEW.KGJT.FF.W.0078.210803T2127Z-210803T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Grand Junction CO
327 PM MDT Tue Aug 3 2021
The National Weather Service in Grand Junction has issued a
* Flash Flood Warning for...
The Lake Christine Fire Burn Area in...
Southwestern Eagle County in west central Colorado...
Eastern Garfield County in west central Colorado...
Northwestern Pitkin County in west central Colorado...
* Until 530 PM MDT.
* At 327 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain over the Lake Christine Fire Burn Area. 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 burn scar into El Jebel as well as across
Fryingpan Road north of Basalt. Runoff and debris flows will also
impact Cattle Creek. 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 Lake
Christine Fire Burn Area.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Lake Christine Fire Burn Area.
* Some locations that will experience flash flooding include...
Basalt, Emma and El Jebel.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a life threatening situation. Heavy rainfall will cause
extensive and severe flash flooding of creeks...streams...and
ditches in the Lake Christine 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 3941 10711 3948 10713 3948 10711 3949 10705
3947 10698 3944 10697 3937 10701 3936 10701
3936 10705 3937 10707 3937 10708 3940 10711
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...0.5-1 INCH IN 1 HOUR
$$
151 follow-up statement
961
WGUS75 KGJT 032326
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
526 PM MDT Tue Aug 3 2021
COC037-045-097-032336-
/O.EXP.KGJT.FF.W.0078.000000T0000Z-210803T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Eagle CO-Garfield CO-Pitkin CO-
526 PM MDT Tue Aug 3 2021
...FLASH FLOOD WARNING FOR THE LAKE CHRISTINE FIRE BURN AREA WILL
EXPIRE AT 530 PM MDT THIS AFTERNOON FOR SOUTHWESTERN EAGLE, EASTERN
GARFIELD AND NORTHWESTERN PITKIN COUNTIES...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
A Flash Flood Watch remains in effect until 1200 AM MDT Wednesday.
LAT...LON 3941 10711 3948 10713 3948 10711 3949 10705
3947 10698 3944 10697 3937 10701 3936 10701
3936 10705 3937 10707 3937 10708 3940 10711
$$
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, 8:27 PM MDT | Flash Flood Warning | GJT | Eagle, Garfield | 2 hr |
| 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, 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.