Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 40, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Jul 26, 2021, 6:10 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, 6:10 PM MDT (00:10 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), 167 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 157 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.
791
WGUS55 KGJT 270010
FFWGJT
UTC037-270315-
/O.NEW.KGJT.FF.W.0040.210727T0010Z-210727T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Grand Junction CO
610 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 610 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.7 and 1 inch of rain
has fallen. The expected rainfall rate is 1 to 1.3 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...
mainly rural areas of East Central San Juan County including State
Road 211 northwest of Monticello.
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.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 3792 10957 3800 10956 3807 10955 3802 10945
3790 10947
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-1.3 INCHES IN 1 HOUR
$$
NL1 follow-up statement
738
WGUS75 KGJT 270310
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
910 PM MDT Mon Jul 26 2021
UTC037-270320-
/O.EXP.KGJT.FF.W.0040.000000T0000Z-210727T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Juan UT-
910 PM MDT Mon Jul 26 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 915 PM MDT THIS EVENING FOR
EAST CENTRAL SAN JUAN COUNTY...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
A Flash Flood Watch remains in effect until 1000 PM MDT for a
portion of southeast Utah.
LAT...LON 3792 10957 3800 10956 3807 10955 3802 10945
3790 10947
$$
15The office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 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.