Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 44, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Jul 27, 2021, 1:51 PM MDT for Grand County, Utah. It was in force for 88 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
- Jul 27, 2021, 1:51 PM MDT (19:51 UTC)
- Expired
- Jul 27, 2021, 3:19 PM MDT
- In force
- 88 min
- Issued by
- NWS Grand Junction, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Grand County, UT
The radar
The Grand Junction radar (KGJX), 145 km from the middle of the area, began a volume at 19:51 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, 7.9 hours before the alert went out and 126 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
- 28 J/kg
- Mixed-layer CIN
- -304 J/kg
- Mixed-layer LCL
- 1735 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- -8 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
305
WGUS55 KGJT 271951
FFWGJT
UTC019-272245-
/O.NEW.KGJT.FF.W.0044.210727T1951Z-210727T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Grand Junction CO
151 PM MDT Tue Jul 27 2021
The National Weather Service in Grand Junction has issued a
* Flash Flood Warning for...
South Central Grand County in east central Utah...
* Until 445 PM MDT.
* At 151 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 313 on route to Canyonlands National Park and Dead Horse
Point State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3866 10976 3856 10971 3852 10982 3862 10988
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$
KJS1 follow-up statement
258 WGUS75 KGJT 272119 FFSGJT Flash Flood Statement National Weather Service Grand Junction CO 319 PM MDT Tue Jul 27 2021 UTC019-272129- /O.CAN.KGJT.FF.W.0044.000000T0000Z-210727T2245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Grand UT- 319 PM MDT Tue Jul 27 2021 ...FLASH FLOOD WARNING IS CANCELLED FOR SOUTH CENTRAL GRAND COUNTY... The heavy rain has ended. Flooding is no longer expected to pose a threat. LAT...LON 3866 10976 3856 10971 3852 10982 3862 10988 $$ KJS
The 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, 6:11 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, 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.