Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 132, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Sep 11, 2021, 6:19 PM MDT for Emery County, Garfield County, Wayne 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 11, 2021, 6:19 PM MDT (00:19 UTC)
- Expired
- Sep 11, 2021, 9:30 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Emery County, UT, Garfield County, UT, Wayne County, UT
The radar
The Cedar City radar (KICX), 159 km from the middle of the area, began a volume at 00:20 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, 0.3 hours before the alert went out and 259 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
- 207 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 3403 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -61 m²/s²
- 0-3 km storm-relative helicity
- 22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted.
092
WGUS55 KSLC 120019
FFWSLC
UTC015-017-055-120330-
/O.NEW.KSLC.FF.W.0132.210912T0019Z-210912T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
619 PM MDT Sat Sep 11 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
Emery County in central Utah...
Northeastern Garfield County in southern Utah...
Western Wayne County in southern Utah...
* Until 930 PM MDT.
* At 619 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. 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 normally dry
washes, roads and low water crossings.
* Some locations that will experience flash flooding include...
Capitol Reef National Park and Fruita.
This includes the following highways...
Utah Route 12 between mile markers 115 and 117...and
between mile markers 120 and 122.
Utah Route 24 between mile markers 70 and 92.
This warning includes Spring Canyon, Sulphur Creek, Grand Wash and
Capitol Gorge. This also includes the Scenic Drive in Capitol Reef
National Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Remain alert for flooding even in locations not receiving rain. Dry
washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
&&
LAT...LON 3817 11133 3841 11147 3850 11126 3823 11103
3812 11119
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CRK2 follow-up statements
616
WGUS75 KSLC 120229
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
829 PM MDT Sat Sep 11 2021
UTC015-120239-
/O.CAN.KSLC.FF.W.0132.000000T0000Z-210912T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emery UT-
829 PM MDT Sat Sep 11 2021
...FLASH FLOOD WARNING IS CANCELLED FOR EMERY COUNTY...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
LAT...LON 3817 11133 3841 11147 3850 11126 3823 11103
3812 11119
$$
UTC017-055-120330-
/O.CON.KSLC.FF.W.0132.000000T0000Z-210912T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-Wayne UT-
829 PM MDT Sat Sep 11 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM MDT THIS
EVENING FOR NORTHEASTERN GARFIELD AND WESTERN WAYNE COUNTIES...
At 829 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. 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 normally dry
washes, roads and low water crossings.
Some locations that will experience flash flooding include...
Capitol Reef National Park and Fruita.
This warning includes Spring Canyon, Sulphur Creek, Grand Wash and
Capitol Gorge. This also includes the Scenic Drive in Capitol Reef
National Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Remain alert for flooding even in locations not receiving rain. Dry
washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
&&
LAT...LON 3817 11133 3841 11147 3850 11126 3823 11103
3812 11119
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CRK417
WGUS75 KSLC 120321
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
921 PM MDT Sat Sep 11 2021
UTC017-055-120331-
/O.EXP.KSLC.FF.W.0132.000000T0000Z-210912T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-Wayne UT-
921 PM MDT Sat Sep 11 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 930 PM MDT THIS EVENING FOR
NORTHEASTERN GARFIELD AND WESTERN WAYNE COUNTIES...
Occasional showers and thunderstorms with brief heavy rainfall will
be possible into the late evening, however the threat of flash
flooding has ended.
LAT...LON 3817 11133 3841 11147 3850 11126 3823 11103
3812 11119
$$
CRKThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 6:30 PM MDT | Special Weather Statement | SLC | Juab | 45 min |
| Sep 11, 7:16 PM MDT | Special Weather Statement | SLC | Juab | 44 min |
| Sep 11, 7:24 PM MDT | Special Weather Statement | SLC | 51 min | |
| Sep 11, 8:15 PM MDT | Flash Flood Warning | SLC | Garfield, Wayne | 3 hr |
| Sep 11, 8:22 PM MDT | Special Weather Statement | SLC | Sanpete | 38 min |
| Sep 11, 9:06 PM MDT | Special Weather Statement | SLC | Sanpete | 39 min |
| Sep 12, 3:29 PM MDT | Special Weather Statement | SLC | Box Elder | 46 min |
| Sep 12, 3:37 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 23 min |
| Sep 12, 3:54 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 51 min |
| Sep 12, 4:13 PM MDT | Special Weather Statement | SLC | Box Elder | 47 min |
| Sep 12, 4:31 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 44 min |
| Sep 12, 4:42 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 24 min |
| Sep 12, 5:08 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 20 min |
| Sep 12, 5:14 PM MDT | Special Weather Statement | SLC | 46 min | |
| Sep 12, 5:54 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 51 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.