Alert archive / Colorado / Flash Flood Warnings in 2021
Flash Flood Warning 31, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Jul 25, 2021, 3:25 PM MDT for Gunnison County, Pitkin County, Colorado. It was in force for 3 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
- Jul 25, 2021, 3:25 PM MDT (21:25 UTC)
- Expired
- Jul 25, 2021, 6:30 PM MDT
- In force
- 3 hr
- Issued by
- NWS Grand Junction, CO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Gunnison County, CO, Pitkin County, CO
The radar
The Grand Junction radar (KGJX), 84 km from the middle of the area, began a volume at 21:24 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, 9.4 hours before the alert went out and 109 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2095 m above ground
- 0-6 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 70 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
251
WGUS55 KGJT 252125
FFWGJT
COC051-097-260030-
/O.NEW.KGJT.FF.W.0031.210725T2125Z-210726T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Grand Junction CO
325 PM MDT Sun Jul 25 2021
The National Weather Service in Grand Junction has issued a
* Flash Flood Warning for...
Northwestern Gunnison County in west central Colorado...
West Central Pitkin County in west central Colorado...
* Until 630 PM MDT.
* At 325 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. The expected rainfall rate is 1
to 2 inches in 1 hour. Flash flooding is ongoing or expected to
begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Highway 133 in between Redstone and McClure Pass as well as county
road 3 to Marble.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3922 10725 3920 10720 3916 10722 3912 10724
3909 10720 3905 10721 3907 10728 3913 10731
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$
KJS2 follow-up statements
034
WGUS75 KGJT 252208
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
408 PM MDT Sun Jul 25 2021
COC051-097-260030-
/O.CON.KGJT.FF.W.0031.000000T0000Z-210726T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gunnison CO-Pitkin CO-
408 PM MDT Sun Jul 25 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM MDT THIS
EVENING FOR NORTHWESTERN GUNNISON AND SOUTHWESTERN PITKIN COUNTIES...
At 408 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. The expected rainfall rate is 1 to 2
inches in 1 hour. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
McClure Pass and county road 3 to Marble.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3915 10730 3915 10726 3912 10724 3909 10720
3905 10721 3907 10728 3913 10731
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$
KJS238
WGUS75 KGJT 260031 RRA
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
631 PM MDT Sun Jul 25 2021
COC051-097-260041-
/O.EXP.KGJT.FF.W.0031.000000T0000Z-210726T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gunnison CO-Pitkin CO-
631 PM MDT Sun Jul 25 2021
...FLASH FLOOD WARNING HAS EXPIRED FOR NORTHWESTERN GUNNISON AND
SOUTHWESTERN PITKIN COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3915 10730 3915 10726 3912 10724 3909 10720
3905 10721 3907 10728 3913 10731
$$
NLThe office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 1:02 PM MDT | Flash Flood Watch | GJT | Eagle, Garfield, Moffat, Pitkin, Rio Blanco, Routt | 7 hr |
| Jul 25, 1:38 PM MDT | Areal Flood Advisory | GJT | Dolores, San Miguel | 112 min |
| Jul 25, 3:53 PM MDT | Areal Flood Advisory | GJT | Rio Blanco | 2 hr |
| Jul 25, 4:06 PM MDT | Flash Flood Warning | GJT | Eagle | 3 hr |
| Jul 25, 4:45 PM MDT | Areal Flood Advisory | GJT | Montezuma | 3 hr |
| Jul 25, 4:53 PM MDT | Special Weather Statement | GJT | Rio Blanco | 22 min |
| Jul 25, 4:54 PM MDT | Flash Flood Warning | GJT | Montrose | 3 hr |
| Jul 25, 5:20 PM MDT | Special Weather Statement | GJT | Rio Blanco | 40 min |
| Jul 25, 5:46 PM MDT | Areal Flood Advisory | GJT | Rio Blanco | 3 hr |
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.