Alert archive / Utah / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 13, NWS Salt Lake City, UT

July 23, 2018Carbon County, Duchesne County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 23, 2018, 4:04 PM MDT for Carbon County, Duchesne County, Utah. It was in force for 41 min. 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 23, 2018, 4:04 PM MDT (22:04 UTC)
Expired: Jul 23, 2018, 4:45 PM MDT
In force: 41 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Carbon County, UT, Duchesne County, UT

The radar

The Grand Junction radar (KGJX), 187 km from the middle of the area, began a volume at 22:06 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 12:00Z, 10.1 hours before the alert went out and 162 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: 9 J/kg
Mixed-layer CIN: -385 J/kg
Mixed-layer LCL: 2110 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -41 m²/s²
0-3 km storm-relative helicity: 13 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

648 
WUUS55 KSLC 232204
SVRSLC
UTC007-013-232245-
/O.NEW.KSLC.SV.W.0013.180723T2204Z-180723T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
404 PM MDT MON JUL 23 2018

The National Weather Service in Salt Lake City has issued a

* Severe Thunderstorm Warning for...
  Northern Carbon County in central Utah...
  Southeastern Duchesne County in northern Utah...

* Until 445 PM MDT

* At 403 PM MDT, a severe thunderstorm was located 24 miles south of
  Myton, or 25 miles southeast of Duchesne, moving east at 15 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* This severe thunderstorm will remain over mainly rural areas of
  northern Carbon and southeastern Duchesne Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3974 11022 3991 11030 4004 10997 3981 10997
TIME...MOT...LOC 2203Z 249DEG 14KT 3985 11017 

HAIL...1.00IN
WIND...60MPH
 
$$

Bonnette

2 follow-up statements

384 
WWUS55 KSLC 232228
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
428 PM MDT MON JUL 23 2018

UTC007-013-232245-
/O.CON.KSLC.SV.W.0013.000000T0000Z-180723T2245Z/
Carbon UT-Duchesne UT-
428 PM MDT MON JUL 23 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM MDT
FOR NORTHERN CARBON AND SOUTHEASTERN DUCHESNE COUNTIES...

At 426 PM MDT, a severe thunderstorm was located 21 miles south of 
Myton, or 26 miles southeast of Duchesne, moving east southeast at 
15 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

This severe thunderstorm will remain over mainly rural areas of
northern Carbon and southeastern Duchesne Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3974 11022 3991 11030 4004 10997 3981 10997
TIME...MOT...LOC 2226Z 249DEG 14KT 3988 11006 

HAIL...1.00IN
WIND...60MPH
 
$$

MS

643 
WWUS55 KSLC 232244
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
444 PM MDT MON JUL 23 2018

UTC007-013-232253-
/O.EXP.KSLC.SV.W.0013.000000T0000Z-180723T2245Z/
Carbon UT-Duchesne UT-
444 PM MDT MON JUL 23 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CARBON AND
SOUTHEASTERN DUCHESNE COUNTIES WILL EXPIRE AT 445 PM MDT...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning will be allowed to expire.

LAT...LON 3974 11022 3991 11030 4004 10997 3981 10997
TIME...MOT...LOC 2243Z 249DEG 14KT 3990 10998 

$$

MS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 3:42 PM MDT	Special Weather Statement	SLC	Wayne	48 min
Jul 23, 4:49 PM MDT	Special Weather Statement	SLC		41 min
Jul 23, 4:57 PM MDT	Severe Thunderstorm Warning	SLC	Garfield	33 min

Nearby

Severe Thunderstorm Warnings in Utah, 2018 Every severe thunderstorm 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.