Alert archive / Utah / Flash Flood Warnings in 2023

Flash Flood Warning 21, NWS Salt Lake City, UT

July 31, 2023Kane County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 31, 2023, 7:33 PM MDT for 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 31, 2023, 7:33 PM MDT (01:33 UTC)
Expired: Jul 31, 2023, 10:30 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), 99 km from the middle of the area, began a volume at 01:33 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

Las Vegas, NV (KVEF), launched 00:00Z, 1.6 hours before the alert went out and 326 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 92 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 3195 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

370 
WGUS55 KSLC 010133
FFWSLC
UTC025-010430-
/O.NEW.KSLC.FF.W.0021.230801T0133Z-230801T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
733 PM MDT Mon Jul 31 2023

The National Weather Service in Salt Lake City has issued a

* Flash Flood Warning for...
  Southwestern Kane County in southern Utah...

* Until 1030 PM MDT.

* At 733 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 0.25 and 0.5 inches of 
  rain have fallen across the Buckskin Gulch drainage, and 
  additional rainfall amounts of 0.25 to 0.5 inches are possible. 
  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, streams,
           and normally dry washes.

* Some locations that will experience flash flooding include...
  Buckskin Gulch in southwestern Kane County

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 3708 11205 3700 11205 3700 11187 3702 11187
      3704 11192 3703 11198 3704 11200 3708 11201

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

MPS

2 follow-up statements

201 
WGUS75 KSLC 010314
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
914 PM MDT Mon Jul 31 2023

UTC025-010430-
/O.CON.KSLC.FF.W.0021.000000T0000Z-230801T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-
914 PM MDT Mon Jul 31 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM MDT THIS 
EVENING FOR SOUTHWESTERN KANE COUNTY...

At 914 PM MDT, Doppler radar indicated earlier thunderstorms 
produced heavy rain across Buckskin Gulch. 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, streams, and
         normally dry washes.

Some locations that will experience flash flooding include...
  Buckskin Gulch in southwestern Kane County

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 3708 11205 3700 11205 3700 11187 3702 11187
      3704 11192 3703 11198 3704 11200 3708 11201

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

MT

555 
WGUS75 KSLC 010425
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
1025 PM MDT Mon Jul 31 2023

UTC025-010435-
/O.EXP.KSLC.FF.W.0021.000000T0000Z-230801T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-
1025 PM MDT Mon Jul 31 2023

...FLASH FLOOD WARNING WILL EXPIRE AT 1030 PM MDT THIS EVENING FOR 
SOUTHWESTERN KANE COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3708 11205 3700 11205 3700 11187 3702 11187
      3704 11192 3703 11198 3704 11200 3708 11201

$$

MT

The office that day

Everything else NWS Salt Lake City, UT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 31, 6:50 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield	3 hr
Jul 31, 10:30 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane, Washington	3 hr
Jul 31, 10:38 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron, Washington	3 hr
Jul 31, 10:50 PM MDT	Areal Flood Advisory	SLC	Washington	3 hr
Jul 31, 11:19 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron	3 hr
Aug 1, 3:11 PM MDT	Special Weather Statement	SLC	Morgan	49 min
Aug 1, 3:40 PM MDT	Special Weather Statement	SLC	Morgan	50 min
Aug 1, 3:53 PM MDT	Special Weather Statement	SLC	Wasatch	52 min
Aug 1, 4:09 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Salt Lake	3 hr
Aug 1, 4:16 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Duchesne	3 hr
Aug 1, 5:07 PM MDT	Special Weather Statement	SLC	Davis	38 min
Aug 1, 5:21 PM MDT	Special Weather Statement	SLC	Kane	39 min

Nearby

Flash Flood Warnings in Utah, 2023 Every flash flood warning in 2023

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.