Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 60, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Jul 27, 2021, 2:46 PM MDT for Garfield County, Kane 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
- Jul 27, 2021, 2:46 PM MDT (20:46 UTC)
- Expired
- Jul 27, 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
Counties Garfield County, UT, Kane County, UT
The radar
The Cedar City radar (KICX), 143 km from the middle of the area, began a volume at 20:48 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, 8.8 hours before the alert went out and 266 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
- 36 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 901 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 84 m²/s²
- 0-3 km storm-relative helicity
- 104 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
324
WGUS55 KSLC 272046
FFWSLC
UTC017-025-272345-
/O.NEW.KSLC.FF.W.0060.210727T2046Z-210727T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
246 PM MDT Tue Jul 27 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
South Central Garfield County in southern Utah...
Northeastern Kane County in southern Utah...
* Until 545 PM MDT.
* At 246 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the upper basin of Twentyfive Mile Wash and
upper basin of Coyote Gulch. Between 1 and 1.5 inches of rain have
fallen near Twentyfive Mile Wash and up to 0.5 inches near
Peekaboo Slot Canyon. Additional heavy rainfall is anticipated
across this 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 creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Twentyfive Mile Wash, Harris Wash, Egypt Slot Canyons, Peekaboo
Slot Canyon, and Spooky Slot Canyon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3755 11133 3756 11136 3764 11137 3767 11127
3767 11121 3766 11119 3761 11117 3759 11113
3758 11113 3747 11118 3747 11121 3749 11126
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SW2 follow-up statements
517
WGUS75 KSLC 272221
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
421 PM MDT Tue Jul 27 2021
UTC017-025-272345-
/O.CON.KSLC.FF.W.0060.000000T0000Z-210727T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-Kane UT-
421 PM MDT Tue Jul 27 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 PM MDT THIS
AFTERNOON FOR SOUTH CENTRAL GARFIELD AND NORTHEASTERN KANE
COUNTIES...
At 421 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain across the upper basin of Twentyfive Mile Wash and upper basin
of Coyote Gulch. Between 1.25 and 1.75 inches of rain have fallen
near Twentyfive Mile Wash and 0.5 to 1.0 inch have fallen near
Peekaboo Slot Canyon. Additional heavy rainfall is anticipated
across this area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Twentyfive Mile Wash, Harris Wash, Egypt Slot Canyons, Peekaboo
Slot Canyon, and Spooky Slot Canyon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3755 11133 3756 11136 3764 11137 3767 11127
3767 11121 3766 11119 3761 11117 3759 11113
3758 11113 3747 11118 3747 11121 3749 11126
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SW844
WGUS75 KSLC 272343
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
543 PM MDT Tue Jul 27 2021
UTC017-025-272353-
/O.EXP.KSLC.FF.W.0060.000000T0000Z-210727T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-Kane UT-
543 PM MDT Tue Jul 27 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 545 PM MDT THIS AFTERNOON FOR
SOUTH CENTRAL GARFIELD AND NORTHEASTERN KANE COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Runoff from earlier heavy rainfall will continue to decrease
through the evening hours. Please continue to heed any road closures.
LAT...LON 3755 11133 3756 11136 3764 11137 3767 11127
3767 11121 3766 11119 3761 11117 3759 11113
3758 11113 3747 11118 3747 11121 3749 11126
$$
SWThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 6:39 PM MDT | Flash Flood Warning | SLC | Kane | 3 hr |
| Jul 26, 7:08 PM MDT | Special Weather Statement | SLC | Salt Lake | 37 min |
| Jul 27, 12:35 PM MDT | Flash Flood Warning | SLC | Wayne | 3 hr |
| Jul 27, 1:23 PM MDT | Flash Flood Warning | SLC | Garfield, Wayne | 3 hr |
| Jul 27, 1:55 PM MDT | Flash Flood Warning | SLC | Garfield | 3 hr |
| Jul 27, 4:40 PM MDT | Special Weather Statement | SLC | Rich | 50 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.