Alert archive / Colorado / Flash Flood Warnings in 2021
Flash Flood Warning 48, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Jul 28, 2021, 3:47 PM MDT for Rio Blanco 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
- Jul 28, 2021, 3:47 PM MDT (21:47 UTC)
- Expired
- Jul 28, 2021, 6:07 PM MDT
- In force
- 2 hr
- Issued by
- NWS Grand Junction, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Rio Blanco County, CO
The radar
The Grand Junction radar (KGJX), 116 km from the middle of the area, began a volume at 21:49 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, 9.8 hours before the alert went out and 115 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
- 68 J/kg
- Mixed-layer CIN
- -138 J/kg
- Mixed-layer LCL
- 1671 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -38 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
529
WGUS55 KGJT 282147 RRA
FFWGJT
COC103-290100-
/O.NEW.KGJT.FF.W.0048.210728T2147Z-210729T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Grand Junction CO
347 PM MDT Wed Jul 28 2021
The National Weather Service in Grand Junction has issued a
* Flash Flood Warning for...
North Central Rio Blanco County in northwestern Colorado...
* Until 700 PM MDT.
* At 347 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. Additional rainfall amounts of 1 to 2 inches 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...
Meeker.
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.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 4020 10803 4019 10791 4017 10784 4008 10789
4003 10789 4002 10791 4001 10796 4002 10803
4002 10807 4003 10806 4004 10802 4005 10800
4006 10799 4008 10800 4011 10805 4014 10806
4017 10805
FLASH FLOOD...RADAR INDICATED
$$
MAC1 follow-up statement
519
WGUS75 KGJT 290007
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
607 PM MDT Wed Jul 28 2021
COC103-290017-
/O.CAN.KGJT.FF.W.0048.000000T0000Z-210729T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Rio Blanco CO-
607 PM MDT Wed Jul 28 2021
...FLASH FLOOD WARNING IS CANCELLED FOR NORTH CENTRAL RIO BLANCO
COUNTY...
The threat for heavy rain has ended. Flooding is no longer expected
to pose a threat. Please continue to heed remaining road closures.
LAT...LON 4020 10803 4019 10791 4017 10784 4008 10789
4003 10789 4002 10791 4001 10796 4002 10803
4002 10807 4003 10806 4004 10802 4005 10800
4006 10799 4008 10800 4011 10805 4014 10806
4017 10805
$$
MMSThe office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 6:16 PM MDT | Special Weather Statement | GJT | La Plata | 29 min |
| Jul 27, 7:28 PM MDT | Areal Flood Advisory | GJT | La Plata | 3 hr |
| Jul 27, 8:58 PM MDT | Special Weather Statement | GJT | Montezuma | 47 min |
| Jul 28, 1:54 PM MDT | Areal Flood Advisory | GJT | Dolores, Montezuma | 3 hr |
| Jul 28, 2:08 PM MDT | Flash Flood Watch | GJT | Eagle, Garfield, Moffat, Pitkin, Rio Blanco, Routt | 8 hr |
| Jul 28, 2:14 PM MDT | Flash Flood Warning | GJT | San Miguel | 3 hr |
| Jul 28, 2:28 PM MDT | Flash Flood Watch | GJT | Archuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 12 more | 34 hr |
| Jul 28, 2:28 PM MDT | Flash Flood Watch | GJT | Archuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 12 more | 58 hr |
| Jul 28, 2:35 PM MDT | Areal Flood Advisory | GJT | Rio Blanco | 3 hr |
| Jul 28, 3:08 PM MDT | Areal Flood Advisory | GJT | Rio Blanco | 3 hr |
| Jul 28, 3:14 PM MDT | Special Weather Statement | GJT | Rio Blanco | 46 min |
| Jul 28, 3:19 PM MDT | Flash Flood Warning | GJT | San Miguel | 3 hr |
| Jul 28, 3:40 PM MDT | Special Weather Statement | GJT | Ouray | 50 min |
| Jul 28, 3:56 PM MDT | Special Weather Statement | GJT | Archuleta | 49 min |
| Jul 28, 4:04 PM MDT | Special Weather Statement | GJT | La Plata | 26 min |
| Jul 28, 4:08 PM MDT | Special Weather Statement | GJT | Montrose | 22 min |
| Jul 28, 4:28 PM MDT | Special Weather Statement | GJT | Garfield | 32 min |
| Jul 28, 4:47 PM MDT | Areal Flood Advisory | GJT | Mesa | 3 hr |
| Jul 28, 5:07 PM MDT | Special Weather Statement | GJT | 23 min | |
| Jul 28, 5:22 PM MDT | Flash Flood Warning | GJT | Mesa, Montrose | 77 min |
| Jul 28, 5:25 PM MDT | Severe Thunderstorm Warning | GJT | Mesa, Montrose | 35 min |
| Jul 28, 5:31 PM MDT | Severe Thunderstorm Warning | GJT | Mesa | 29 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.