Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 87, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 2, 2021, 2:56 PM MDT for 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
- Aug 2, 2021, 2:56 PM MDT (20:56 UTC)
- Expired
- Aug 2, 2021, 6:00 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Garfield County, UT, Wayne County, UT
The radar
The Cedar City radar (KICX), 160 km from the middle of the area, began a volume at 20:59 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 12:00Z, 8.9 hours before the alert went out and 257 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
- 22 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 1085 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 55 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
611
WGUS55 KSLC 022056
FFWSLC
UTC017-055-030000-
/O.NEW.KSLC.FF.W.0087.210802T2056Z-210803T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
256 PM MDT Mon Aug 2 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
Northeastern Garfield County in southern Utah...
South Central Wayne County in southern Utah...
* Until 600 PM MDT.
* At 256 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.25 and 0.5 inches of
rain have fallen. Additional rainfall amounts of 0.25 to 0.5
inches are possible in 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 slot canyons along
with small streams and normally dry washes.
* Some locations that will experience flash flooding include...
Burro Wash, Cottonwood Wash, and Sheets Gulch within Capitol Reef
National Park, along with the Notom Road.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3815 11129 3818 11130 3818 11120 3818 11111
3820 11109 3818 11105 3807 11106 3808 11124
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MPS2 follow-up statements
001
WGUS75 KSLC 022218
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
418 PM MDT Mon Aug 2 2021
UTC017-055-030000-
/O.CON.KSLC.FF.W.0087.000000T0000Z-210803T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-Wayne UT-
418 PM MDT Mon Aug 2 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING
FOR NORTHEASTERN GARFIELD AND SOUTH CENTRAL WAYNE COUNTIES...
At 418 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 0.5 and 1 inch of rain has
fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Burro Wash, Cottonwood Wash, and Sheets Gulch within Capitol Reef
National Park, along with the Notom Road.
This includes the following streams and drainages...
Sandy Creek, Pleasant Creek, Chokecherry Creek, Sulphur Creek and
Oak Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3815 11129 3818 11130 3818 11120 3818 11111
3820 11109 3818 11105 3807 11106 3808 11124
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MPS551
WGUS75 KSLC 022351
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
551 PM MDT Mon Aug 2 2021
UTC017-055-030001-
/O.EXP.KSLC.FF.W.0087.000000T0000Z-210803T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-Wayne UT-
551 PM MDT Mon Aug 2 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 6 PM MDT THIS EVENING FOR
NORTHEASTERN GARFIELD AND SOUTH CENTRAL WAYNE COUNTIES...
The heavy rain has ended and flooding is no longer expected to pose
an immediate threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 900 PM MDT for portions
of Utah and southwest Wyoming.
LAT...LON 3815 11129 3818 11130 3818 11120 3818 11111
3820 11109 3818 11105 3807 11106 3808 11124
$$
MPSThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 6:01 PM MDT | Flash Flood Warning | SLC | Emery, Garfield, Wayne | 3 hr |
| Aug 1, 6:09 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder, Tooele | 51 min |
| Aug 1, 6:17 PM MDT | Special Weather Statement | SLC | Box Elder | 43 min |
| Aug 1, 6:27 PM MDT | Areal Flood Advisory | SLC | Tooele | 3 hr |
| Aug 1, 6:36 PM MDT | Special Weather Statement | SLC | Salt Lake | 39 min |
| Aug 1, 6:47 PM MDT | Severe Thunderstorm Warning | SLC | Davis, Salt Lake, Tooele | 43 min |
| Aug 1, 7:00 PM MDT | Areal Flood Advisory | SLC | Salt Lake | 3 hr |
| Aug 1, 7:07 PM MDT | Areal Flood Advisory | SLC | Garfield, Iron | 113 min |
| Aug 1, 7:25 PM MDT | Severe Thunderstorm Warning | SLC | Davis, Salt Lake | 35 min |
| Aug 1, 7:41 PM MDT | Areal Flood Advisory | SLC | Salt Lake | 3 hr |
| Aug 1, 7:58 PM MDT | Flash Flood Warning | SLC | Davis | 3 hr |
| Aug 1, 8:25 PM MDT | Areal Flood Advisory | SLC | Davis | 3 hr |
| Aug 1, 8:51 PM MDT | Areal Flood Advisory | SLC | Utah | 114 min |
| Aug 1, 9:06 PM MDT | Areal Flood Advisory | SLC | Davis, Weber | 3 hr |
| Aug 2, 2:04 AM MDT | Flash Flood Watch | SLC | Beaver, Box Elder, Cache, Carbon, Davis, Duchesne and 19 more | 18 hr |
| Aug 2, 1:16 PM MDT | Flash Flood Warning | SLC | Carbon | 3 hr |
| Aug 2, 1:27 PM MDT | Flash Flood Warning | SLC | Emery | 3 hr |
| Aug 2, 2:30 PM MDT | Flash Flood Warning | SLC | Wayne | 4 hr |
| Aug 2, 3:24 PM MDT | Severe Thunderstorm Warning | SLC | Garfield | 66 min |
| Aug 2, 3:32 PM MDT | Special Weather Statement | SLC | Emery | 43 min |
| Aug 2, 3:52 PM MDT | Flash Flood Warning | SLC | Garfield | 4 hr |
| Aug 2, 4:00 PM MDT | Special Weather Statement | SLC | Juab | 45 min |
| Aug 2, 4:14 PM MDT | Flash Flood Warning | SLC | Garfield, San Juan | 3 hr |
| Aug 2, 4:25 PM MDT | Special Weather Statement | SLC | 50 min | |
| Aug 2, 4:55 PM MDT | Special Weather Statement | SLC | 50 min | |
| Aug 2, 5:22 PM MDT | Special Weather Statement | SLC | Box Elder | 38 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.