Alert archive / Utah / Flash Flood Warnings in 2018

Flash Flood Warning 5, NWS Salt Lake City, UT

July 11, 2018Emery County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 11, 2018, 2:22 PM MDT for Emery 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 11, 2018, 2:22 PM MDT (20:22 UTC)
Expired: Jul 11, 2018, 5:15 PM MDT
In force: 3 hr
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Flood severity: None

County Emery County, UT

The radar

The Salt Lake City radar (KMTX), 238 km from the middle of the area, began a volume at 20:22 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 8.4 hours before the alert went out and 169 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: 44 J/kg
Mixed-layer CIN: -316 J/kg
Mixed-layer LCL: 2382 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 20 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.

755 
WGUS55 KSLC 112022
FFWSLC
UTC015-112315-
/O.NEW.KSLC.FF.W.0005.180711T2022Z-180711T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
222 PM MDT WED JUL 11 2018

The National Weather Service in Salt Lake City has issued a

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

* Until 515 PM MDT

* At 218 PM MDT, Doppler radar indicated heavy rain over the Trail 
  Mountain Burn Scar in Huntington Canyon just north of the to. wn 
  of Huntington. This area has had a recent wildfire and is prone to 
  flash flooding and debris flows. 
  

* Radar estimates indicate heavy rain has been falling for the past 
  15 minutes.  It is anticipated that local water supply springs are 
  in danger.

* Some locations that will experience flooding include...
  Huntington.

LAT...LON 3942 11107 3936 11097 3933 11095 3931 11100
      3939 11121 3948 11121 3946 11115

$$

McInerney

2 follow-up statements

924 
WGUS75 KSLC 112207
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
407 PM MDT WED JUL 11 2018

UTC015-112315-
/O.CON.KSLC.FF.W.0005.000000T0000Z-180711T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emery UT-
407 PM MDT WED JUL 11 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM MDT FOR
WEST CENTRAL EMERY COUNTY...

At 400 PM MDT, While heavy rainfall has moved out of the Trail 
Mountain Burn Scar, it is inferred that mud and debris has coursed 
through the scar.  However, the threat of further debris flows 
remain as thunderstorm activity remains in the area.

If you are traveling through Huntington Canyon, please be vigilant 
to the threat of debris flows through the evening hours.
 

LAT...LON 3942 11107 3936 11097 3933 11095 3931 11100
      3939 11121 3948 11121 3946 11115

$$

McInerney

520 
WGUS75 KSLC 112309
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
509 PM MDT WED JUL 11 2018

UTC015-112318-
/O.EXP.KSLC.FF.W.0005.000000T0000Z-180711T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emery UT-
509 PM MDT WED JUL 11 2018

...THE FLASH FLOOD WARNING FOR WEST CENTRAL EMERY COUNTY WILL EXPIRE
AT 515 PM MDT...

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

LAT...LON 3942 11107 3936 11097 3933 11095 3931 11100
      3939 11121 3948 11121 3946 11115

$$

MS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 9:08 PM MDT	Special Weather Statement	SLC	Davis	52 min
Jul 11, 1:57 PM MDT	Special Weather Statement	SLC	Utah	33 min
Jul 11, 2:32 PM MDT	Special Weather Statement	SLC	Salt Lake	28 min
Jul 11, 4:12 PM MDT	Special Weather Statement	SLC	Wasatch	33 min
Jul 11, 4:46 PM MDT	Flash Flood Warning	SLC	Iron	3 hr

Nearby

Flash Flood Warnings in Utah, 2018 Every flash flood warning in 2018

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.