Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 134, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Sep 18, 2021, 2:43 PM MDT for Emery 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 18, 2021, 2:43 PM MDT (20:43 UTC)
- Expired
- Sep 18, 2021, 5:45 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Emery County, UT
The radar
The Salt Lake City radar (KMTX), 236 km from the middle of the area, began a volume at 20:47 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
Salt Lake City I, UT (KSLC), launched 12:00Z, 8.7 hours before the alert went out and 167 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2721 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 144 m²/s²
- 0-3 km storm-relative helicity
- 178 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
415
WGUS55 KSLC 182043
FFWSLC
UTC015-182345-
/O.NEW.KSLC.FF.W.0134.210918T2043Z-210918T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
243 PM MDT Sat Sep 18 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
The Trail Mountain Burn Scar in...
West Central Emery County in central Utah...
* Until 545 PM MDT.
* At 243 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain over the Trail Mountain Burn Scar. Flash flooding is
ongoing or expected to begin shortly.
Excessive rainfall over the burn scar will result in debris flow
moving through Huntington Canyon. The debris flow can consist of
rock, mud, vegetation and other loose materials.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding in and around the Trail
Mountain Burn Scar.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Trail Mountain Burn Scar.
* Some locations that will experience flash flooding include...
Huntington.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A debris flow is expected to impact Huntington Creek, spring water
supply infrastructure, and potentially the Crandall Canyon Monument.
Additionally the water intakes for the Huntington Power Plant just
upstream from Huntington, and the Huntington Cleveland Irrigation
Company may be impacted.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3947 11112 3939 11105 3935 11097 3932 11097
3937 11120 3948 11123
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CRK1 follow-up statement
414
WGUS75 KSLC 182206
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
406 PM MDT Sat Sep 18 2021
UTC015-182345-
/O.CON.KSLC.FF.W.0134.000000T0000Z-210918T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emery UT-
406 PM MDT Sat Sep 18 2021
...FLASH FLOOD WARNING FOR THE TRAIL MOUNTAIN BURN SCAR REMAINS IN
EFFECT UNTIL 545 PM MDT THIS AFTERNOON FOR WEST CENTRAL EMERY
COUNTY...
At 406 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain over the Trail Mountain Burn Scar. Flash flooding is ongoing or
expected to begin shortly.
Excessive rainfall over the burn scar will result in debris flow
moving through Huntington Canyon. The debris flow can consist of
rock, mud, vegetation and other loose materials.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding in and around the Trail Mountain Burn
Scar.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Trail Mountain Burn Scar.
Some locations that will experience flash flooding include...
Huntington.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A debris flow is expected to impact Huntington Creek, spring water
supply infrastructure, and potentially the Crandall Canyon Monument.
Additionally the water intakes for the Huntington Power Plant just
upstream from Huntington, and the Huntington Cleveland Irrigation
Company may be impacted.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3947 11112 3939 11105 3935 11097 3932 11097
3937 11120 3948 11123
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CRKThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 18, 11:25 AM MDT | Special Weather Statement | SLC | Iron | 50 min |
| Sep 18, 1:07 PM MDT | Special Weather Statement | SLC | Sanpete | 38 min |
| Sep 18, 1:51 PM MDT | Special Weather Statement | SLC | Utah, Wasatch | 39 min |
| Sep 18, 3:12 PM MDT | High Wind Watch | SLC | Utah | 12 hr |
| Sep 18, 3:15 PM MDT | Special Weather Statement | SLC | Duchesne | 45 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.