Alert archive / Colorado / Flash Flood Warnings in 2021
Flash Flood Warning 77, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Aug 3, 2021, 3:21 PM MDT for San Miguel County, Colorado. It was in force for 104 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
- Aug 3, 2021, 3:21 PM MDT (21:21 UTC)
- Expired
- Aug 3, 2021, 5:05 PM MDT
- In force
- 104 min
- Issued by
- NWS Grand Junction, CO
- Area
- Storm-based polygon
- Flood severity
- None
County San Miguel County, CO
The radar
The Grand Junction radar (KGJX), 121 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 134 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.
591
WGUS55 KGJT 032121
FFWGJT
COC113-032315-
/O.NEW.KGJT.FF.W.0077.210803T2121Z-210803T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Grand Junction CO
321 PM MDT Tue Aug 3 2021
The National Weather Service in Grand Junction has issued a
* Flash Flood Warning for...
East Central San Miguel County in southwestern Colorado...
* Until 515 PM MDT.
* At 321 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1 inch of rain
has fallen. Additional rainfall amounts of 0.5 to 1 inch are
possible in the warned area. 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...
Sawpit, Fall Creek and Placerville.
This includes the following highways...
Colorado 62 near mile marker 1.
Colorado 145 between mile markers 76 and 87.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3803 10811 3805 10811 3805 10809 3800 10797
3798 10793 3795 10793 3793 10795 3792 10797
3792 10800 3794 10801 3796 10804 3798 10807
3801 10808 3802 10810
FLASH FLOOD...RADAR INDICATED
$$
ERW1 follow-up statement
219
WGUS75 KGJT 032305
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
505 PM MDT Tue Aug 3 2021
COC113-032315-
/O.CAN.KGJT.FF.W.0077.000000T0000Z-210803T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Miguel CO-
505 PM MDT Tue Aug 3 2021
...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL SAN MIGUEL
COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 1200 AM MDT Wednesday
for portions of northwest Colorado, southwest Colorado and west
central Colorado.
LAT...LON 3803 10811 3805 10811 3805 10809 3800 10797
3798 10793 3795 10793 3793 10795 3792 10797
3792 10800 3794 10801 3796 10804 3798 10807
3801 10808 3802 10810
$$
ERWThe 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, 3:27 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.