Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 41, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Jul 26, 2021, 6:11 PM MDT for San Juan County, Utah. 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 26, 2021, 6:11 PM MDT (00:11 UTC)
- Expired
- Jul 26, 2021, 9:15 PM MDT
- In force
- 3 hr
- Issued by
- NWS Grand Junction, CO
- Area
- Storm-based polygon
- Flood severity
- None
County San Juan County, UT
The radar
The Grand Junction radar (KGJX), 172 km from the middle of the area, began a volume at 00:11 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 164 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
- 143 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 3158 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 70 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
294
WGUS55 KGJT 270011
FFWGJT
UTC037-270315-
/O.NEW.KGJT.FF.W.0041.210727T0011Z-210727T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Grand Junction CO
611 PM MDT Mon Jul 26 2021
The National Weather Service in Grand Junction has issued a
* Flash Flood Warning for...
East Central San Juan County in southeastern Utah...
* Until 915 PM MDT.
* At 611 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across 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...
Highway 191 south of Monticello and Montezuma Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3803 10973 3813 10946 3794 10936 3782 10935
3771 10936 3762 10942 3782 10963
FLASH FLOOD...RADAR INDICATED
$$
MMS2 follow-up statements
513
WGUS75 KGJT 270015
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
615 PM MDT Mon Jul 26 2021
UTC037-270315-
/O.CON.KGJT.FF.W.0041.000000T0000Z-210727T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Juan UT-
615 PM MDT Mon Jul 26 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM MDT THIS
EVENING FOR EAST CENTRAL SAN JUAN COUNTY...
At 615 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
mainly rural areas of East Central San Juan County, Highway 191
south of Monticello and Montezuma Creek
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3789 10950 3782 10935 3771 10936 3762 10942
3783 10962
FLASH FLOOD...RADAR INDICATED
$$
MMS203
WGUS75 KGJT 270310 RRA
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
910 PM MDT Mon Jul 26 2021
UTC037-270320-
/O.EXP.KGJT.FF.W.0041.000000T0000Z-210727T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Juan UT-
910 PM MDT Mon Jul 26 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 915 PM MDT THIS EVENING FOR
EAST CENTRAL SAN JUAN 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 1000 PM MDT for a
portion of southeast Utah.
LAT...LON 3789 10950 3782 10935 3771 10936 3762 10942
3783 10962
$$
NLThe office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 6:10 PM MDT | Flash Flood Warning | GJT | San Juan | 3 hr |
| Jul 26, 6:21 PM MDT | Flash Flood Warning | GJT | San Juan | 3 hr |
| Jul 26, 7:07 PM MDT | Areal Flood Advisory | GJT | Grand | 3 hr |
| Jul 26, 7:44 PM MDT | Flash Flood Warning | GJT | Grand | 3 hr |
| Jul 26, 7:55 PM MDT | Special Weather Statement | GJT | San Juan | 50 min |
| Jul 26, 9:32 PM MDT | Areal Flood Advisory | GJT | San Juan | 118 min |
| Jul 27, 12:47 PM MDT | Areal Flood Advisory | GJT | San Juan | 3 hr |
| Jul 27, 1:27 PM MDT | Areal Flood Advisory | GJT | Grand | 24 min |
| Jul 27, 1:51 PM MDT | Flash Flood Warning | GJT | Grand | 88 min |
| Jul 27, 2:29 PM MDT | Areal Flood Advisory | GJT | San Juan | 2 hr |
Nearby
Flash Flood Warnings in Utah, 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.