Alert archive / Utah / Flash Flood Warnings in 2021

Flash Flood Warning 37, NWS Salt Lake City, UT

July 23, 2021Kane County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 23, 2021, 2:34 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 23, 2021, 2:34 PM MDT (20:34 UTC)
Expired: Jul 23, 2021, 5:45 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), 104 km from the middle of the area, began a volume at 20:33 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 8.6 hours before the alert went out and 203 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: 503 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 915 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

522 
WGUS55 KSLC 232034
FFWSLC
UTC025-232345-
/O.NEW.KSLC.FF.W.0037.210723T2034Z-210723T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
234 PM MDT Fri Jul 23 2021

The National Weather Service in Salt Lake City has issued a

* Flash Flood Warning for...
  South Central Kane County in southern Utah...

* Until 545 PM MDT.

* At 234 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the lower Paria Canyon area, Paria Toadstools 
  and Rimrock area, and just now entering mid to lower portions of 
  Buckskin Gulch. Between 0.25 and 1 inch of rain has 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...
  Lower Paria River Canyon, Paria Toadstools and Rimrock area 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3700 11193 3700 11198 3716 11195 3716 11180
      3700 11182

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

$$

GM

1 follow-up statement

047 
WGUS75 KSLC 232343
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
543 PM MDT Fri Jul 23 2021

UTC025-232353-
/O.EXP.KSLC.FF.W.0037.000000T0000Z-210723T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-
543 PM MDT Fri Jul 23 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 545 PM MDT THIS AFTERNOON FOR 
SOUTH CENTRAL KANE COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. This said, additional thunderstorm activity remains possible 
through this evening, so monitor the latest forecasts and keep an 
eye on the sky for any approaching storms.

A Flash Flood Watch remains in effect until 1000 PM MDT for portions 
of southern Utah and southwest Utah.

LAT...LON 3700 11193 3700 11198 3716 11195 3716 11180
      3700 11182

$$

GM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 6:01 PM MDT	Special Weather Statement	SLC	Tooele	44 min
Jul 22, 6:47 PM MDT	Special Weather Statement	SLC	Utah	43 min
Jul 22, 6:53 PM MDT	Areal Flood Advisory	SLC	Salt Lake	112 min
Jul 22, 7:03 PM MDT	Special Weather Statement	SLC	Davis	42 min
Jul 22, 7:07 PM MDT	Severe Thunderstorm Warning	SLC	Salt Lake, Utah	23 min
Jul 22, 7:21 PM MDT	Severe Thunderstorm Warning	SLC	Davis, Morgan, Salt Lake, Summit	24 min
Jul 22, 7:23 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Utah	82 min
Jul 22, 7:30 PM MDT	Special Weather Statement	SLC	Salt Lake	30 min
Jul 22, 7:37 PM MDT	Areal Flood Advisory	SLC	Utah	105 min
Jul 22, 7:44 PM MDT	Special Weather Statement	SLC	Salt Lake	46 min
Jul 22, 7:52 PM MDT	Areal Flood Advisory	SLC	Salt Lake	86 min
Jul 22, 8:01 PM MDT	Special Weather Statement	SLC	Morgan	29 min
Jul 22, 8:11 PM MDT	Special Weather Statement	SLC	Davis	49 min
Jul 22, 8:29 PM MDT	Severe Thunderstorm Warning	SLC	Davis, Salt Lake, Tooele	31 min
Jul 22, 8:56 PM MDT	Special Weather Statement	SLC	Morgan, Salt Lake, Weber	49 min
Jul 23, 3:20 AM MDT	Flash Flood Watch	SLC	Beaver, Garfield, Iron, Kane, Piute, Washington and 1 more	21 hr
Jul 23, 3:14 PM MDT	Special Weather Statement	SLC	Iron	46 min
Jul 23, 3:27 PM MDT	Special Weather Statement	SLC	Box Elder	33 min
Jul 23, 4:04 PM MDT	Special Weather Statement	SLC	Cache	26 min
Jul 23, 4:35 PM MDT	Special Weather Statement	SLC	Cache	25 min
Jul 23, 5:03 PM MDT	Special Weather Statement	SLC	Cache	27 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.