Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 86, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 2, 2021, 2:30 PM MDT for Wayne County, Utah. It was in force for 4 hr. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 2, 2021, 2:30 PM MDT (20:30 UTC)
- Expired
- Aug 2, 2021, 6:30 PM MDT
- In force
- 4 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Wayne County, UT
The radar
The Cedar City radar (KICX), 162 km from the middle of the area, began a volume at 20:30 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 2, 4:36 PM MDT | FLASH FLOOD | 2 Sw Capitol Reef Np, UT | CAPITOL REEF OFFICIALS REPORT FLASH FLOODING IN GRAND WASH. |
| Aug 2, 5:18 PM MDT | FLASH FLOOD | 3 W Capitol Reef Np, UT | PARK SERVICE REPORTS THE FREMONT RIVER IS FLASHING AND SULPHUR CREEK IS RUNNING HIGH. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Grand Junction, CO (KGJT), launched 12:00Z, 8.5 hours before the alert went out and 255 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.
114
WGUS55 KSLC 022030
FFWSLC
UTC055-022330-
/O.NEW.KSLC.FF.W.0086.210802T2030Z-210802T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
230 PM MDT Mon Aug 2 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
Southwestern Wayne County in southern Utah...
* Until 530 PM MDT.
* At 230 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, small
streams and normally dry washes.
* Some locations that will experience flash flooding include...
Capitol Reef National Park, Torrey, Teasdale and Fruita.
This includes the following streams and drainages...
Sulphur Creek, Grand Wash, Capitol Gorge, Pleasant Creek, and the
Fremont River.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3833 11131 3833 11124 3831 11111 3832 11105
3828 11103 3824 11110 3820 11109 3818 11111
3818 11130 3825 11148 3832 11150 3833 11139
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MPS3 follow-up statements
340
WGUS75 KSLC 022204
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
404 PM MDT Mon Aug 2 2021
UTC055-022330-
/O.CON.KSLC.FF.W.0086.000000T0000Z-210802T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Wayne UT-
404 PM MDT Mon Aug 2 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM MDT THIS
AFTERNOON FOR SOUTHWESTERN WAYNE COUNTY...
At 404 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 0.5 and 1 inch of rain has
fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of slot canyons, small
streams, and normally dry washes.
Some locations that will experience flash flooding include...
Capitol Reef National Park, Torrey, Teasdale and Fruita.
This includes the following streams and drainages...
Sulphur Creek, Grand Wash, Capitol Gorge, Pleasant Creek, and the
Fremont River.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3833 11131 3833 11124 3831 11111 3832 11105
3828 11103 3824 11110 3820 11109 3818 11111
3818 11130 3825 11148 3832 11150 3833 11139
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MPS607
WGUS55 KSLC 022326
FFWSLC
UTC055-030030-
/O.EXT.KSLC.FF.W.0086.000000T0000Z-210803T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
526 PM MDT Mon Aug 2 2021
The National Weather Service in Salt Lake City has extended the
* Flash Flood Warning for...
Southwestern Wayne County in southern Utah...
* Until 630 PM MDT.
* At 526 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 small streams and
normally dry washes.
* Some locations that will experience flash flooding include...
Grand Wash and the Fremont River within Capitol Reef National Park.
This includes the following highways...
Utah Route 12 between mile markers 115 and 122.
Utah Route 24 between mile markers 65 and 95.
Capitol Reef National Park Rangers reported normally dry washes are
still flowing and the Fremont River remains very high. Thus the
Flash Flood Warning is being extended.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3833 11131 3833 11124 3831 11111 3832 11105
3828 11103 3824 11110 3820 11109 3818 11111
3818 11130 3825 11148 3832 11150 3833 11139
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MPS493
WGUS75 KSLC 030025
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
625 PM MDT Mon Aug 2 2021
UTC055-030035-
/O.EXP.KSLC.FF.W.0086.000000T0000Z-210803T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Wayne UT-
625 PM MDT Mon Aug 2 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 630 PM MDT THIS EVENING FOR
SOUTHWESTERN WAYNE COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose an
imminent threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 900 PM MDT for portions
of Utah and southwest Wyoming.
LAT...LON 3833 11131 3833 11124 3831 11111 3832 11105
3828 11103 3824 11110 3820 11109 3818 11111
3818 11130 3825 11148 3832 11150 3833 11139
$$
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, 2:56 PM MDT | Flash Flood Warning | SLC | Garfield, Wayne | 3 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.