Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 90, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 12, 2021, 4:25 PM MDT for Kane County, Utah. It was in force for 3 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 12, 2021, 4:25 PM MDT (22:25 UTC)
- Expired
- Aug 12, 2021, 7:30 PM MDT
- In force
- 3 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), 66 km from the middle of the area, began a volume at 22:27 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 12, 5:15 PM MDT | FLASH FLOOD | 2 Wsw Kanab, UT | PHOTOS OF WATER AND MUD OVER A ROADWAY IN KANAB AS WELL AS FLOODED BACKYARDS |
| Aug 12, 5:15 PM MDT | FLASH FLOOD | Kanab, UT | PHOTOS OF WATER AND MUD OVER A ROADWAY IN KANAB AS WELL AS FLOODED BACKYARDS |
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, 10.4 hours before the alert went out and 214 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
- 40 J/kg
- Mixed-layer CIN
- -119 J/kg
- Mixed-layer LCL
- 1538 m above ground
- 0-6 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- 53 m²/s²
- 0-3 km storm-relative helicity
- 62 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
165
WGUS55 KSLC 122225
FFWSLC
UTC025-130130-
/O.NEW.KSLC.FF.W.0090.210812T2225Z-210813T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
425 PM MDT Thu Aug 12 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
Southwestern Kane County in southern Utah...
* Until 730 PM MDT.
* At 425 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 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
and normally dry washes.
* Some locations that will experience flash flooding include...
Kanab.
Additional locations include Johnson Wash and Kanab Creek.
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.
&&
LAT...LON 3700 11260 3727 11258 3730 11224 3700 11234
3700 11253 3700 11254 3700 11255
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
AD2 follow-up statements
741
WGUS75 KSLC 130001
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
601 PM MDT Thu Aug 12 2021
UTC025-130130-
/O.CON.KSLC.FF.W.0090.000000T0000Z-210813T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-
601 PM MDT Thu Aug 12 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM MDT THIS
EVENING FOR SOUTHWESTERN KANE COUNTY...
At 601 PM MDT, Flash Flooding has been reported near Kanab. Doppler
radar indicates between 1 and 2 inches of rain have fallen. Flash
flooding is already occurring.
HAZARD...Life threatening flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Kanab, Johnson Wash and Kanab Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Remain alert for flooding even in locations not receiving rain. Dry
washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
&&
LAT...LON 3700 11260 3727 11258 3730 11224 3700 11234
3700 11253 3700 11254 3700 11255
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
AD596
WGUS75 KSLC 130126
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
726 PM MDT Thu Aug 12 2021
UTC025-130136-
/O.EXP.KSLC.FF.W.0090.000000T0000Z-210813T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-
726 PM MDT Thu Aug 12 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 730 PM MDT THIS EVENING FOR
SOUTHWESTERN KANE COUNTY...
Heavy rainfall has ended across the area.
LAT...LON 3700 11260 3727 11258 3730 11224 3700 11234
3700 11253 3700 11254 3700 11255
$$
ADNearby
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.