Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 129, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Sep 2, 2021, 5:33 PM MDT for Garfield 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
- Sep 2, 2021, 5:33 PM MDT (23:33 UTC)
- Expired
- Sep 2, 2021, 8:45 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Garfield County, UT
The radar
The Cedar City radar (KICX), 127 km from the middle of the area, began a volume at 23:35 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
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 11.6 hours before the alert went out and 274 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
- 14 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 833 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 14 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
471
WGUS55 KSLC 022333
FFWSLC
UTC017-030245-
/O.NEW.KSLC.FF.W.0129.210902T2333Z-210903T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
533 PM MDT Thu Sep 2 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
South Central Garfield County in southern Utah...
* Until 845 PM MDT.
* At 533 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain along Harris Wash. Radar estimates up to one inch of
rain has already fallen. Flash flooding is ongoing or expected to
begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Harris Wash to its terminus at the Escalante River.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3768 11124 3763 11120 3760 11147 3760 11154
3768 11160 3775 11161 3775 11146
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MT1 follow-up statement
262
WGUS75 KSLC 030101
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
701 PM MDT Thu Sep 2 2021
UTC017-030245-
/O.CON.KSLC.FF.W.0129.000000T0000Z-210903T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-
701 PM MDT Thu Sep 2 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM MDT THIS
EVENING FOR SOUTH CENTRAL GARFIELD COUNTY...
At 701 PM MDT, Doppler radar indicated earlier thunderstorms
produced heavy rain over Harris Wash. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Harris Wash to its terminus at the Escalante River.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3768 11124 3763 11120 3760 11147 3760 11154
3768 11160 3775 11161 3775 11146
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MTThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 9:26 PM MDT | Areal Flood Warning | SLC | Wayne | 10 hr |
| Sep 1, 9:51 PM MDT | Areal Flood Warning | SLC | Garfield, San Juan, Wayne | 7 hr |
| Sep 2, 4:53 AM MDT | Areal Flood Warning | SLC | Garfield, Wayne | 3 hr |
| Sep 2, 4:35 PM MDT | Special Weather Statement | SLC | Duchesne | 25 min |
| Sep 2, 4:38 PM MDT | Special Weather Statement | SLC | Garfield | 37 min |
| Sep 2, 4:40 PM MDT | Special Weather Statement | SLC | Tooele | 35 min |
| Sep 2, 5:52 PM MDT | Special Weather Statement | SLC | Salt Lake | 23 min |
| Sep 2, 5:58 PM MDT | Special Weather Statement | SLC | Davis | 32 min |
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.