Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 50, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Jul 28, 2021, 6:32 PM MDT for San Juan County, Utah. It was in force for 75 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 28, 2021, 6:32 PM MDT (00:32 UTC)
- Expired
- Jul 28, 2021, 7:47 PM MDT
- In force
- 75 min
- 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), 184 km from the middle of the area, began a volume at 00:34 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, 0.5 hours before the alert went out and 178 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
- 405 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 3067 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
651
WGUS55 KGJT 290032
FFWGJT
UTC037-290230-
/O.NEW.KGJT.FF.W.0050.210729T0032Z-210729T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Grand Junction CO
632 PM MDT Wed Jul 28 2021
The National Weather Service in Grand Junction has issued a
* Flash Flood Warning for...
East Central San Juan County in southeastern Utah...
* Until 830 PM MDT.
* At 632 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. The expected rainfall rate is
0.5 to 1 inch 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...
Blanding.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3780 10946 3777 10934 3770 10939 3765 10937
3760 10941 3761 10951 3774 10950
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.5-1 INCH IN 1 HOUR
$$
MMS1 follow-up statement
524
WGUS75 KGJT 290147
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
747 PM MDT Wed Jul 28 2021
UTC037-290157-
/O.CAN.KGJT.FF.W.0050.000000T0000Z-210729T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Juan UT-
747 PM MDT Wed Jul 28 2021
...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL SAN JUAN
COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3780 10946 3777 10934 3770 10939 3765 10937
3760 10941 3761 10951 3774 10950
$$
MMSThe office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 7:23 PM MDT | Flash Flood Warning | GJT | Grand, San Juan | 3 hr |
| Jul 28, 7:38 PM MDT | Areal Flood Warning | GJT | Grand | 5 min |
| Jul 28, 7:43 PM MDT | Flash Flood Warning | GJT | Grand | 3 hr |
| Jul 29, 5:39 PM MDT | Areal Flood Advisory | GJT | San Juan | 3 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.