Alert archive / Utah / Flash Flood Warnings in 2021

Flash Flood Warning 44, NWS Salt Lake City, UT

July 24, 2021Garfield County, Kane County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 24, 2021, 8:08 PM MDT for Garfield County, 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 24, 2021, 8:08 PM MDT (02:08 UTC)
Expired: Jul 24, 2021, 10:56 PM MDT
In force: 3 hr
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Garfield County, UT, Kane County, UT

The radar

The Cedar City radar (KICX), 183 km from the middle of the area, began a volume at 02:09 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

Grand Junction, CO (KGJT), launched 00:00Z, 2.1 hours before the alert went out and 256 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: 50 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 2806 m above ground
0-6 km bulk shear: 2 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

968 
WGUS55 KSLC 250208
FFWSLC
UTC017-025-250515-
/O.NEW.KSLC.FF.W.0044.210725T0208Z-210725T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
808 PM MDT Sat Jul 24 2021

The National Weather Service in Salt Lake City has issued a

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

* Until 1115 PM MDT.

* At 808 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 0.5 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...
  mainly rural areas of South Central Garfield and Northeastern Kane 
  Counties

This includes the following streams and drainages...
  the Bullfrog Creek drainage through the confluence with Lake Powell

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3757 11079 3763 11081 3769 11085 3771 11086
      3773 11086 3775 11088 3780 11087 3782 11087
      3783 11082 3784 11074 3782 11068 3775 11070
      3772 11077 3770 11080 3767 11079 3758 11076
      3754 11074 3751 11072 3749 11075

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

$$

SW

2 follow-up statements

037 
WGUS75 KSLC 250345
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
945 PM MDT Sat Jul 24 2021

UTC017-025-250515-
/O.CON.KSLC.FF.W.0044.000000T0000Z-210725T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-Kane UT-
945 PM MDT Sat Jul 24 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM MDT THIS 
EVENING FOR SOUTH CENTRAL GARFIELD AND NORTHEASTERN KANE COUNTIES...

At 945 PM MDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 0.5 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...
  mainly rural areas of South Central Garfield and Northeastern Kane 
  Counties

This includes the following streams and drainages...
  Pennell Creek, Copper Creek, Muley Creek, Colorado River, Bullfrog 
  Creek, Hansen Creek and Shitamaring Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3757 11079 3763 11081 3769 11085 3771 11086
      3773 11086 3775 11088 3780 11087 3782 11087
      3783 11082 3784 11074 3782 11068 3775 11070
      3772 11077 3770 11080 3767 11079 3758 11076
      3754 11074 3751 11072 3749 11075

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

$$

WFO SLC

171 
WGUS75 KSLC 250456
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
1056 PM MDT Sat Jul 24 2021

UTC017-025-250506-
/O.CAN.KSLC.FF.W.0044.000000T0000Z-210725T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-Kane UT-
1056 PM MDT Sat Jul 24 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTH CENTRAL GARFIELD AND 
NORTHEASTERN KANE COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat tonight.

LAT...LON 3757 11079 3763 11081 3769 11085 3771 11086
      3773 11086 3775 11088 3780 11087 3782 11087
      3783 11082 3784 11074 3782 11068 3775 11070
      3772 11077 3770 11080 3767 11079 3758 11076
      3754 11074 3751 11072 3749 11075

$$

WFO SLC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 7:17 PM MDT	Special Weather Statement	SLC	Garfield	28 min
Jul 25, 2:25 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron	3 hr
Jul 25, 2:49 PM MDT	Special Weather Statement	SLC	Piute	26 min
Jul 25, 2:53 PM MDT	Special Weather Statement	SLC	Beaver	37 min
Jul 25, 3:11 PM MDT	Special Weather Statement	SLC	Piute	34 min
Jul 25, 3:18 PM MDT	Special Weather Statement	SLC	Sevier	27 min
Jul 25, 3:33 PM MDT	Special Weather Statement	SLC	Iron	27 min
Jul 25, 3:49 PM MDT	Severe Thunderstorm Warning	SLC	Iron	26 min
Jul 25, 4:11 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron	3 hr
Jul 25, 4:21 PM MDT	Special Weather Statement	SLC	Washington	24 min
Jul 25, 4:29 PM MDT	Areal Flood Advisory	SLC	Iron	3 hr
Jul 25, 4:41 PM MDT	Special Weather Statement	SLC	Washington	19 min
Jul 25, 4:41 PM MDT	Special Weather Statement	SLC	Iron	49 min
Jul 25, 4:52 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Iron, Kane, Washington	4 hr
Jul 25, 5:16 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Washington	3 hr
Jul 25, 5:26 PM MDT	Severe Thunderstorm Warning	SLC	Washington	19 min
Jul 25, 5:42 PM MDT	Severe Thunderstorm Warning	SLC	Washington	33 min
Jul 25, 5:44 PM MDT	Special Weather Statement	SLC	Washington	31 min
Jul 25, 5:52 PM MDT	Special Weather Statement	SLC	Washington	23 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.