Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 93, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 14, 2021, 4:47 PM MDT for Kane County, Washington 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 14, 2021, 4:47 PM MDT (22:47 UTC)
- Expired
- Aug 14, 2021, 7:22 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Kane County, UT, Washington County, UT
The radar
The Cedar City radar (KICX), 42 km from the middle of the area, began a volume at 22:47 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
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 10.8 hours before the alert went out and 244 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
- 112 J/kg
- Mixed-layer CIN
- -173 J/kg
- Mixed-layer LCL
- 1662 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 116 m²/s²
- 0-3 km storm-relative helicity
- 206 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
725
WGUS55 KSLC 142247
FFWSLC
UTC025-053-150145-
/O.NEW.KSLC.FF.W.0093.210814T2247Z-210815T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
447 PM MDT Sat Aug 14 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
Western Kane County in southern Utah...
Eastern Washington County in southwestern Utah...
* Until 745 PM MDT.
* At 447 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain near Spry Canyon, Keyhole Canyon, Pine Creek and Lower
Clear Creek. Between 0.25 and 0.5 inches of rain have 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...
Zion National Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3723 11290 3722 11290 3720 11295 3720 11296
3722 11298 3723 11295 3723 11294 3723 11292
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
AW2 follow-up statements
137
WGUS75 KSLC 150009
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
609 PM MDT Sat Aug 14 2021
UTC025-053-150145-
/O.CON.KSLC.FF.W.0093.000000T0000Z-210815T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-Washington UT-
609 PM MDT Sat Aug 14 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM MDT THIS
EVENING FOR WESTERN KANE AND EASTERN WASHINGTON COUNTIES...
At 609 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain in Spry Canyon, Keyhole Canyon, Pine Creek and Lower Clear
Creek. Between 0.25 and 0.5 inches of rain have fallen. Flash
flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Zion National Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3723 11290 3722 11290 3720 11295 3720 11296
3722 11298 3723 11295 3723 11294 3723 11292
FLASH FLOOD...RADAR INDICATED
$$
AW427
WGUS75 KSLC 150122
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
722 PM MDT Sat Aug 14 2021
UTC025-053-150132-
/O.CAN.KSLC.FF.W.0093.000000T0000Z-210815T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-Washington UT-
722 PM MDT Sat Aug 14 2021
...FLASH FLOOD WARNING IS CANCELLED FOR WESTERN KANE AND EASTERN
WASHINGTON COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3723 11290 3722 11290 3720 11295 3720 11296
3722 11298 3723 11295 3723 11294 3723 11292
$$
AWThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 1:17 PM MDT | Flash Flood Warning | SLC | Emery | 3 hr |
| Aug 14, 3:19 PM MDT | Special Weather Statement | SLC | Iron | 41 min |
| Aug 14, 3:35 PM MDT | Special Weather Statement | SLC | 40 min | |
| Aug 14, 5:14 PM MDT | Special Weather Statement | SLC | Washington | 46 min |
| Aug 14, 5:25 PM MDT | Severe Thunderstorm Warning | SLC | Washington | 36 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.