Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 137, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Oct 5, 2021, 4:43 PM MDT for Kane County, Utah. It was in force for 4 hr. 1 report 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
- Oct 5, 2021, 4:43 PM MDT (22:43 UTC)
- Expired
- Oct 5, 2021, 8:45 PM MDT
- In force
- 4 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Kane County, UT
The radar
The Cedar City radar (KICX), 98 km from the middle of the area, began a volume at 22:44 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 |
|---|---|---|---|
| Oct 5, 6:30 PM MDT | FLASH FLOOD | 19 W Big Water, UT | FLASH FLOOD WAVE OF 1000 CFS WAS OBSERVED ON THE PARIA AT KANAB USGS GAGE BY 6PM LOCAL TIME, WITH MULTIPLE SMALLER FLOOD WAVES FOLLOWING. A SINGLE LARGE FLOOD WAVE OF 3K CFS WAS OBSERVED FAR DOWNSTREAM AT LEES FERRY BY 1130PM WITH BUCKSKIN GULCH LIKELY FLASHIN |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 10.7 hours before the alert went out and 205 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 986 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 121 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
860
WGUS55 KSLC 052243
FFWSLC
UTC025-060245-
/O.NEW.KSLC.FF.W.0137.211005T2243Z-211006T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
443 PM MDT Tue Oct 5 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
Southern Kane County in southern Utah...
* Until 845 PM MDT.
* At 443 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across Wire Pass and Upper Buckskin Gulch areas.
Between 0.25 and 0.5 inches of rain have fallen. Additional
rainfall is expected over the next few hours. 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
and slot canyons.
* Some locations that will experience flash flooding include...
House Rock Road, Wire Pass, and Buckskin Gulch
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 3712 11206 3709 11180 3700 11181 3700 11211
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
GM2 follow-up statements
997
WGUS75 KSLC 060046
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
646 PM MDT Tue Oct 5 2021
UTC025-060245-
/O.CON.KSLC.FF.W.0137.000000T0000Z-211006T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-
646 PM MDT Tue Oct 5 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM MDT THIS
EVENING FOR SOUTHERN KANE COUNTY...
At 646 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of normally dry washes
and slot canyons.
Some locations that will experience flash flooding include...
House Rock Road, Wire Pass, and Buckskin Gulch
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Remain alert for flooding even in locations not receiving rain. Dry
washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
&&
LAT...LON 3712 11206 3709 11180 3700 11181 3700 11211
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CRK216 WGUS75 KSLC 060241 FFSSLC Flash Flood Statement National Weather Service Salt Lake City UT 841 PM MDT Tue Oct 5 2021 UTC025-060251- /O.EXP.KSLC.FF.W.0137.000000T0000Z-211006T0245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Kane UT- 841 PM MDT Tue Oct 5 2021 ...FLASH FLOOD WARNING WILL EXPIRE AT 845 PM MDT THIS EVENING FOR SOUTHERN KANE COUNTY... The heavy rain has ended. Slot canyons and normally dry washes will continue to see elevated flows through the overnight hours. LAT...LON 3712 11206 3709 11180 3700 11181 3700 11211 $$ CRK
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 5, 3:07 PM MDT | Special Weather Statement | SLC | Washington | 38 min |
| Oct 5, 3:40 PM MDT | Special Weather Statement | SLC | Washington | 50 min |
| Oct 5, 4:01 PM MDT | Flash Flood Warning | SLC | Kane, Washington | 4 hr |
| Oct 5, 4:03 PM MDT | Special Weather Statement | SLC | Kane | 42 min |
| Oct 5, 5:42 PM MDT | Special Weather Statement | SLC | Kane | 48 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.