Alert archive / Utah / Flash Flood Warnings in 2022

Flash Flood Warning 49, NWS Salt Lake City, UT

August 1, 2022Emery County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 1, 2022, 1:43 PM MDT for Emery 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: Aug 1, 2022, 1:43 PM MDT (19:43 UTC)
Expired: Aug 1, 2022, 4:45 PM MDT
In force: 3 hr
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Emery County, UT

The radar

The Cedar City radar (KICX), 238 km from the middle of the area, began a volume at 19:43 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
Aug 1, 2:40 PM MDT	FLASH FLOOD	11 Nnw Clawson, UT	EMERY COUNTY DISPATCH REPORTED SR-29 WAS IMPASSIBLE STARTING AROUND MILE MARKER 9 TO JOES VALLEY RESERVOIR. UP TO A FOOT OF MUD AND DEBRIS WAS DEPOSITED ACROSS THE ROAD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 7.7 hours before the alert went out and 178 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: 198 J/kg
Mixed-layer CIN: -217 J/kg
Mixed-layer LCL: 2218 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

355 
WGUS55 KSLC 011943
FFWSLC
UTC015-012245-
/O.NEW.KSLC.FF.W.0049.220801T1943Z-220801T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
143 PM MDT Mon Aug 1 2022

The National Weather Service in Salt Lake City has issued a

* Flash Flood Warning for...
  Northwestern Emery County in central Utah...

* Until 445 PM MDT.

* At 143 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 0.5 and 0.75 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 and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  SR-29 through Straight Canyon and Joe's Valley access road.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3930 11126 3932 11123 3932 11119 3928 11114
      3925 11106 3924 11108 3925 11111 3925 11118
      3926 11124 3928 11127

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

$$

Webber

3 follow-up statements

533 
WGUS75 KSLC 012047
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
247 PM MDT Mon Aug 1 2022

UTC015-012245-
/O.CON.KSLC.FF.W.0049.000000T0000Z-220801T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emery UT-
247 PM MDT Mon Aug 1 2022

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM MDT THIS 
AFTERNOON FOR NORTHWESTERN EMERY COUNTY...

At 247 PM MDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 0.5 and 1.00 inches of rain 
have fallen. Flash flooding is already occurring. SR-29 is 
impassable.

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...
  SR-29 through Straight Canyon and Joe's Valley access road.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3930 11126 3932 11123 3932 11119 3928 11114
      3925 11106 3924 11108 3925 11111 3925 11118
      3926 11124 3928 11127

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

$$

Webber

203 
WGUS75 KSLC 012051
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
251 PM MDT Mon Aug 1 2022

UTC015-012245-
/O.CON.KSLC.FF.W.0049.000000T0000Z-220801T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emery UT-
251 PM MDT Mon Aug 1 2022

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM MDT THIS 
AFTERNOON FOR NORTHWESTERN EMERY COUNTY...

At 251 PM MDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 0.5 and 1.00 inches of rain 
have fallen. Flash flooding is already occurring. SR-29 is 
impassable past mile post 9 due to mud and debris on the road.

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

SOURCE...Law enforcement reported.

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

Some locations that will experience flash flooding include...
  SR-29 through Straight Canyon and Joe's Valley access road.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3930 11126 3932 11123 3932 11119 3928 11114
      3925 11106 3924 11108 3925 11111 3925 11118
      3926 11124 3928 11127

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

$$

Webber

721 
WGUS75 KSLC 012242
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
442 PM MDT Mon Aug 1 2022

UTC015-012252-
/O.EXP.KSLC.FF.W.0049.000000T0000Z-220801T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emery UT-
442 PM MDT Mon Aug 1 2022

...FLASH FLOOD WARNING WILL EXPIRE AT 445 PM MDT THIS AFTERNOON FOR 
NORTHWESTERN EMERY COUNTY...

The heavy rain has ended. Additional light rainfall will continue 
over the area. Flooding is no longer expected to pose a threat. 
Please continue to heed remaining road closures.

A Flood Watch remains in effect until 1200 AM MDT Tuesday for 
portions of central Utah and northern Utah.

LAT...LON 3930 11126 3932 11123 3932 11119 3928 11114
      3925 11106 3924 11108 3925 11111 3925 11118
      3926 11124 3928 11127

$$

Webber

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 6:11 PM MDT	Areal Flood Advisory	SLC	Iron	2 hr
Aug 1, 11:06 AM MDT	Flood Watch	SLC	Carbon, Duchesne, Emery, Juab, Millard, Salt Lake and 6 more	13 hr
Aug 1, 1:50 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Wayne	3 hr
Aug 1, 2:03 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Duchesne, Wasatch	3 hr

Nearby

Flash Flood Warnings in Utah, 2022 Every flash flood warning in 2022

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.