Alert archive / Utah / Flash Flood Warnings in 2021

Flash Flood Warning 56, NWS Salt Lake City, UT

July 26, 2021Kane County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 26, 2021, 6:39 PM MDT for Kane County, Utah. It was in force for 3 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: Jul 26, 2021, 6:39 PM MDT (00:39 UTC)
Expired: Jul 26, 2021, 9:45 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 00:43 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
Jul 26, 8:00 PM MDT	FLASH FLOOD	20 W Big Water, UT	OFFICIALS WITH GRAND STAIRCASE ESCALANTE NATIONAL MONUMENT AT THE KANAB OFFICE REPORT THAT SIGNIFICANT DAMAGE WAS SUSTAINED ON HOUSE ROCK ROAD NEAR WIRE PASS DUE TO FLASH FLOODING. TIME IS ESTIMATED.

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 00:00Z, 0.7 hours before the alert went out and 202 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: 401 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1252 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

066 
WGUS55 KSLC 270039
FFWSLC
UTC025-270345-
/O.NEW.KSLC.FF.W.0056.210727T0039Z-210727T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
639 PM MDT Mon Jul 26 2021

The National Weather Service in Salt Lake City has issued a

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

* Until 945 PM MDT.

* At 639 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across Hole in the Rock Road, Wire Pass, and upper 
  portions of Buckskin Gulch. Between 0.50 and 0.75 inches of rain 
  have fallen over these specific areas. Additional heavy rain will 
  fall over the next 15-30 minutes. Flash flooding is ongoing or 
  expected to begin shortly, with the flooding initially over Hole 
  in the Rock and Wire Pass areas, then traveling downstream through 
  Buckskin Gulch and into the Paria Narrows at the Arizona border 
  through this evening.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of normally dry
           washes, slot canyons, and gulches.

* Some locations that will experience flash flooding include...
  Hole in the 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.

&&

LAT...LON 3700 11207 3712 11206 3712 11196 3710 11187
      3700 11182 3700 11201 3700 11203

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

$$

GM

2 follow-up statements

060 
WGUS75 KSLC 270106
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
706 PM MDT Mon Jul 26 2021

UTC025-270345-
/O.CON.KSLC.FF.W.0056.000000T0000Z-210727T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-
706 PM MDT Mon Jul 26 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 PM MDT THIS 
EVENING FOR SOUTHERN KANE COUNTY...

At 706 PM MDT, Doppler radar indicated the thunderstorms that 
produced heavy rain across the House Rock Road, Wire Pass, and upper 
Buckskin Gulch areas over the last hour have largely shifted to the 
east, but .50 to 1 inch of rain fell across these specific areas. 
Flash flooding is ongoing or expected to begin shortly, with the 
flooding initially over House Rock Road and Wire Pass areas, then 
traveling downstream through the Buckskin Gulch and into the Paria 
Narrows at the Arizona border through this evening.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar.

IMPACT...Life threatening flash flooding of normally dry washes,
         slot canyons, and gulches.

Some locations that will experience flash flooding include...
  House Rock Road, Wire Pass, Buckskin Gulch, and the lower Paria 
  Narrows.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3700 11207 3712 11206 3712 11196 3710 11187
      3700 11182 3700 11201 3700 11203

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

$$

GM

760 
WGUS75 KSLC 270341
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
941 PM MDT Mon Jul 26 2021

UTC025-270351-
/O.EXP.KSLC.FF.W.0056.000000T0000Z-210727T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-
941 PM MDT Mon Jul 26 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 945 PM MDT THIS EVENING FOR 
SOUTHERN KANE COUNTY...

Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

LAT...LON 3700 11207 3712 11206 3712 11196 3710 11187
      3700 11182 3700 11201 3700 11203

$$

MT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 7:08 PM MDT	Special Weather Statement	SLC	Salt Lake	37 min
Jul 27, 12:35 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Wayne	3 hr
Jul 27, 1:23 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield, Wayne	3 hr
Jul 27, 1:55 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield	3 hr
Jul 27, 2:46 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield, Kane	3 hr
Jul 27, 4:40 PM MDT	Special Weather Statement	SLC	Rich	50 min

Nearby

Flash Flood Warnings in Utah, 2021 Every 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.