Alert archive / Utah / Flash Flood Warnings in 2022

Flash Flood Warning 55, NWS Grand Junction, CO

August 20, 2022Grand County, San Juan County, Utah

NWS Grand Junction, CO issued this flash flood warning at Aug 20, 2022, 7:10 PM MDT for Grand County, San Juan County, Utah. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 20, 2022, 7:10 PM MDT (01:10 UTC)
Expired
Aug 20, 2022, 11:15 PM MDT
In force
4 hr
Issued by
NWS Grand Junction, CO
Area
Storm-based polygon
Flood severity
None

Counties Grand County, UT, San Juan County, UT

The radar

The Grand Junction radar (KGJX), 153 km from the middle of the area, began a volume at 01:13 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, 1.2 hours before the alert went out and 138 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.

Skew-T log-pSkew-T log-p diagram, Grand Junction, CO at 00:00Z on 2022-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 229 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Grand Junction, CO at 00:00Z on 2022-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
229 J/kg
Mixed-layer CIN
-91 J/kg
Mixed-layer LCL
1828 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
42 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Grand Junction, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 20, 6:17 PM MDTSpecial Weather StatementGJT43 min
Aug 20, 9:14 PM MDTFlash Flood WarningGJTMesa95 min
Aug 20, 11:48 PM MDTSpecial Weather StatementGJTGarfield27 min
Aug 21, 2:34 AM MDTFlash Flood WatchGJTEagle, Garfield, Moffat, Pitkin, Rio Blanco, Routt11 hr
Aug 21, 12:43 PM MDTFlash Flood Warning Considerable damage threatGJTGarfield, Mesa3 hr
Aug 21, 1:42 PM MDTFlash Flood Warning Considerable damage threatGJTEagle, Garfield99 min
Aug 21, 1:53 PM MDTAreal Flood AdvisoryGJTMesa3 hr
Aug 21, 2:55 PM MDTAreal Flood AdvisoryGJTMesa110 min
Aug 21, 3:04 PM MDTAreal Flood AdvisoryGJTMesa3 hr
Aug 21, 3:21 PM MDTFlash Flood WatchGJTEagle, Garfield, Moffat, Pitkin, Rio Blanco, Routt2 hr
Aug 21, 5:07 PM MDTSpecial Weather StatementGJTRoutt38 min
Aug 20, 6:32 PM MDTAreal Flood AdvisoryGJTSan Juan18 min
Aug 20, 6:50 PM MDTFlash Flood WarningGJTSan Juan100 min
Aug 20, 7:05 PM MDTSpecial Weather StatementGJTGrand25 min
Aug 20, 7:10 PM MDTSpecial Weather StatementGJTGrand35 min
Aug 20, 7:21 PM MDTAreal Flood AdvisoryGJTGrand3 hr
Aug 20, 9:49 PM MDTFlash Flood Warning Considerable damage threatGJTGrand3 hr

Nearby

Flash Flood Warnings in Utah, 2022Every flash flood warning in 2022

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.