Alert archive / Utah / Flash Flood Warnings in 2021

Flash Flood Warning 65, NWS Salt Lake City, UT

July 29, 2021Garfield County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 29, 2021, 6:03 PM MDT for Garfield County, Utah. It was in force for 117 min. 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 29, 2021, 6:03 PM MDT (00:03 UTC)
Expired: Jul 29, 2021, 8:00 PM MDT
In force: 117 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Garfield County, UT

The radar

The Cedar City radar (KICX), 103 km from the middle of the area, began a volume at 00:02 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 29, 6:03 PM MDT	FLASH FLOOD	5 W Escalante, UT	SEVERAL REPORTS OF FLASH FLOODING IN AND AROUND ESCALANTE, INCLUDING BIRCH CREEK. STORM SPOTTERS REPORTED LOGS AND TREES FLOATING IN THE ESCALANTE RIVER JUST NORTH OF ESCALANTE. TIME OF EVENT COINCIDENT WITH TIME OF FIRST REPORT.

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, 0.1 hours before the alert went out and 290 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: 222 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 1896 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

876 
WGUS55 KSLC 300003
FFWSLC
UTC017-300200-
/O.NEW.KSLC.FF.W.0065.210730T0003Z-210730T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
603 PM MDT Thu Jul 29 2021

The National Weather Service in Salt Lake City has issued a

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

* Until 800 PM MDT.

* At 603 PM MDT, Trained weather spotters reported flash flooding 
  along the Escalante River in Escalante. Doppler radar estimates 
  between 2 and 3 inches of rain have fallen. Flash flooding is 
  already occurring.

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

  SOURCE...Trained spotters reported.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Birch Creek, North Creek, and the Escalante River in the town of 
  Escalante.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3796 11177 3785 11169 3778 11166 3779 11159
      3777 11158 3769 11175 3782 11193 3791 11186

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

MT

2 follow-up statements

885 
WGUS75 KSLC 300136
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
736 PM MDT Thu Jul 29 2021

UTC017-300200-
/O.CON.KSLC.FF.W.0065.000000T0000Z-210730T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-
736 PM MDT Thu Jul 29 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING 
FOR CENTRAL GARFIELD COUNTY...

At 736 PM MDT, Trained weather spotters reported flash flooding 
along the Escalante River and Escalante Creek in Escalante. Doppler 
radar estimates that between 2 and 3 inches of rain have fallen in 
this area.

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

SOURCE...Trained spotters reported.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Escalante Creek, Escalante River near Escalante, Birch Creek, 
  North Creek

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3796 11177 3785 11169 3778 11166 3779 11159
      3777 11158 3769 11175 3782 11193 3791 11186

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

MT

262 
WGUS75 KSLC 300157
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
757 PM MDT Thu Jul 29 2021

UTC017-300207-
/O.EXP.KSLC.FF.W.0065.000000T0000Z-210730T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-
757 PM MDT Thu Jul 29 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR 
CENTRAL GARFIELD COUNTY...

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

A Flash Flood Watch remains in effect until 300 AM MDT Friday for a 
portion of southern Utah.

LAT...LON 3796 11177 3785 11169 3778 11166 3779 11159
      3777 11158 3769 11175 3782 11193 3791 11186

$$

MT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 6:03 PM MDT	Special Weather Statement	SLC	Kane	27 min
Jul 29, 6:24 PM MDT	Special Weather Statement	SLC	Kane	36 min
Jul 29, 7:06 PM MDT	Special Weather Statement	SLC	Washington	24 min
Jul 29, 7:16 PM MDT	Special Weather Statement	SLC	Wayne	29 min
Jul 29, 7:23 PM MDT	Special Weather Statement	SLC	Wayne	37 min
Jul 29, 7:40 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane	3 hr
Jul 29, 7:41 PM MDT	Severe Thunderstorm Warning	SLC	Garfield, Wayne	34 min
Jul 29, 7:46 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane	3 hr
Jul 29, 7:52 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield, Wayne	113 min
Jul 29, 8:11 PM MDT	Special Weather Statement	SLC	Iron	19 min
Jul 29, 8:51 PM MDT	Special Weather Statement	SLC	Iron	39 min
Jul 29, 9:01 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Washington	3 hr
Jul 29, 9:42 PM MDT	Special Weather Statement	SLC	Carbon	63 min
Jul 30, 3:38 AM MDT	Flash Flood Watch	SLC	Beaver, Garfield, Iron, Kane, Piute, Washington and 1 more	19 hr
Jul 30, 2:17 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Washington	3 hr
Jul 30, 2:18 PM MDT	Special Weather Statement	SLC	Sevier	42 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.