Alert archive / Utah / Flash Flood Warnings in 2020

Flash Flood Warning 3, NWS Salt Lake City, UT

June 6, 2020Garfield County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jun 6, 2020, 9:55 AM MDT for Garfield 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
Jun 6, 2020, 9:55 AM MDT (15:55 UTC)
Expired
Jun 6, 2020, 1:00 PM MDT
In force
3 hr
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), 129 km from the middle of the area, began a volume at 15:55 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, 3.9 hours before the alert went out and 279 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-pSkew-T log-p diagram, Flgstf/Belemont, AZ at 12:00Z on 2020-06-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 2020-06-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 163 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2305 m above ground
0-6 km bulk shear
71 kt
0-1 km storm-relative helicity
163 m²/s²
0-3 km storm-relative helicity
202 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

281 
WGUS55 KSLC 061555
FFWSLC
UTC017-061900-
/O.NEW.KSLC.FF.W.0003.200606T1555Z-200606T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
955 AM MDT Sat Jun 6 2020

The National Weather Service in Salt Lake City has issued a

* Flash Flood Warning for...
  South central Garfield County in southern Utah...

* Until 100 PM MDT

* At 954 AM MDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area.  Flash flooding is ongoing or 
  expected to begin shortly.  

  HAZARD...Life threatening flash flooding. Heavy rain producing 
           flash flooding. 

  SOURCE...Radar indicated. 

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

* Some locations that will experience flooding include...
  Escalante. This warning includes Harris Wash and other creeks and 
  dry washes near Escalante. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3769 11122 3765 11119 3761 11135 3774 11174
      3791 11168

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

$$

CRK
2 follow-up statements
885 
WGUS75 KSLC 061722
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
1122 AM MDT Sat Jun 6 2020

UTC017-061900-
/O.CON.KSLC.FF.W.0003.000000T0000Z-200606T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-
1122 AM MDT Sat Jun 6 2020

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 100 PM MDT FOR
SOUTH CENTRAL GARFIELD COUNTY...

At 1121 AM MDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area.  Flash flooding is ongoing or expected
to begin shortly.

HAZARD...Life threatening flash flooding. Heavy rain producing flash 
         flooding. 

SOURCE...Radar indicated. 

IMPACT...Life threatening flash flooding of creeks and streams and 
         dry washes. 

Some locations that will experience flooding include...
Escalante, Harris Wash, Death Hollow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Remain alert for flooding even in locations not receiving rain.
Normally dry washes, streams, and rivers can become raging killer
currents in a matter of minutes, even from distant rainfall.

&&

LAT...LON 3769 11122 3765 11119 3761 11135 3774 11174
      3791 11168

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

$$

CRK
209 
WGUS75 KSLC 061852
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
1252 PM MDT Sat Jun 6 2020

UTC017-061901-
/O.EXP.KSLC.FF.W.0003.000000T0000Z-200606T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-
1252 PM MDT Sat Jun 6 2020

...THE FLASH FLOOD WARNING FOR SOUTH CENTRAL GARFIELD COUNTY WILL
EXPIRE AT 100 PM MDT...

Heavy rain has ended across south central Garfield County. Areas 
stream, creeks and normally dry washes will continue to see elevated 
flows through the afternoon.

LAT...LON 3769 11122 3765 11119 3761 11135 3774 11174
      3791 11168

$$

CRK

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 5, 6:06 PM MDTSevere Thunderstorm WarningSLCDavis, Salt Lake, Tooele, Utah54 min
Jun 5, 6:33 PM MDTSevere Thunderstorm WarningSLCDavis, Salt Lake, Weber42 min
Jun 5, 6:56 PM MDTSevere Thunderstorm WarningSLCBox Elder, Davis, Tooele, Weber19 min
Jun 5, 7:28 PM MDTSpecial Weather StatementSLCCache, Rich62 min
Jun 5, 7:36 PM MDTSevere Thunderstorm WarningSLCBox Elder58 min
Jun 5, 8:21 PM MDTSpecial Weather StatementSLCTooele54 min
Jun 5, 9:16 PM MDTSpecial Weather StatementSLCTooele89 min
Jun 6, 7:14 AM MDTSpecial Weather StatementSLCDavis, Salt Lake46 min
Jun 6, 8:11 AM MDTSpecial Weather StatementSLC49 min
Jun 6, 8:25 AM MDTSpecial Weather StatementSLCPiute35 min
Jun 6, 8:56 AM MDTSpecial Weather StatementSLCWayne49 min
Jun 6, 9:01 AM MDTSpecial Weather StatementSLCPiute44 min
Jun 6, 9:07 AM MDTSpecial Weather StatementSLCSan Juan23 min
Jun 6, 9:22 AM MDTSpecial Weather StatementSLCGarfield53 min
Jun 6, 9:30 AM MDTSpecial Weather StatementSLCEmery45 min
Jun 6, 9:41 AM MDTSpecial Weather StatementSLCGarfield34 min
Jun 6, 9:51 AM MDTSevere Thunderstorm WarningSLCGarfield, Wayne39 min
Jun 6, 10:02 AM MDTSpecial Weather StatementSLCSevier43 min
Jun 6, 10:15 AM MDTSpecial Weather StatementSLCSevier45 min
Jun 6, 10:28 AM MDTSpecial Weather StatementSLCWayne47 min
Jun 6, 10:33 AM MDTAreal Flood AdvisorySLCGarfield87 min
Jun 6, 11:07 AM MDTSpecial Weather StatementSLCWayne38 min
Jun 6, 11:12 AM MDTFlash Flood Warning Considerable damage threatSLCGarfield, Wayne3 hr
Jun 6, 11:26 AM MDTSpecial Weather StatementSLCDuchesne49 min
Jun 6, 11:48 AM MDTFlash Flood Warning Considerable damage threatSLCEmery, Garfield, Wayne3 hr
Jun 6, 11:58 AM MDTSpecial Weather StatementSLCEmery47 min
Jun 6, 12:31 PM MDTWind AdvisorySLC8 hr
Jun 6, 12:47 PM MDTAreal Flood AdvisorySLCEmery3 hr
Jun 6, 12:59 PM MDTSpecial Weather StatementSLCGrand16 min
Jun 6, 1:04 PM MDTSpecial Weather StatementSLC41 min
Jun 6, 1:23 PM MDTSpecial Weather StatementSLCDavis, Salt Lake, Weber52 min
Jun 6, 1:24 PM MDTSpecial Weather StatementSLCCache51 min
Jun 6, 1:37 PM MDTSpecial Weather StatementSLCCache38 min
Jun 6, 1:49 PM MDTSpecial Weather StatementSLCBox Elder41 min
Jun 6, 2:17 PM MDTSpecial Weather StatementSLCCache73 min
Jun 6, 2:23 PM MDTSpecial Weather StatementSLCBox Elder52 min
Jun 6, 2:28 PM MDTSevere Thunderstorm WarningSLCBox Elder47 min
Jun 6, 3:13 PM MDTSpecial Weather StatementSLCBox Elder17 min
Jun 6, 3:29 PM MDTSpecial Weather StatementSLCJuab, Tooele, Utah61 min
Jun 6, 3:31 PM MDTSevere Thunderstorm WarningSLCBox Elder29 min
Jun 6, 3:51 PM MDTSevere Thunderstorm WarningSLCBox Elder24 min
Jun 6, 4:18 PM MDTSpecial Weather StatementSLCDavis, Salt Lake, Tooele, Utah, Wasatch42 min
Jun 6, 4:56 PM MDTSpecial Weather StatementSLCDavis, Morgan, Salt Lake, Summit, Weber49 min
Jun 6, 5:37 PM MDTSpecial Weather StatementSLCDavis, Morgan, Summit, Weber38 min

Nearby

Flash Flood Warnings in Utah, 2020Every flash flood warning in 2020

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.