Alert archive / Utah / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 21, NWS Salt Lake City, UT

August 8, 2014Box Elder County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 8, 2014, 4:53 PM MDT for Box Elder County, Utah. It was in force for 67 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
Aug 8, 2014, 4:53 PM MDT (22:53 UTC)
Expired
Aug 8, 2014, 6:00 PM MDT
In force
67 min
Issued by
NWS Salt Lake City, UT
Area
Storm-based polygon

County Box Elder County, UT

The radar

The Salt Lake City radar (KMTX), 82 km from the middle of the area, began a volume at 22:54 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

Elko, NV (KLKN), launched 12:00Z, 10.9 hours before the alert went out and 109 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, Elko, NV at 12:00Z on 2014-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 35 joules per kilogram.LCLLFCEL10008507005003002001001 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, Elko, NV at 12:00Z on 2014-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 square meters per square second.1939Sfc1 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
35 J/kg
Mixed-layer CIN
-228 J/kg
Mixed-layer LCL
1839 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

768 
WUUS55 KSLC 082253
SVRSLC
UTC003-090000-
/O.NEW.KSLC.SV.W.0021.140808T2253Z-140809T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
453 PM MDT FRI AUG 8 2014

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL BOX ELDER COUNTY IN UTAH...

* UNTIL 600 PM MDT

* AT 452 PM MDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 
  CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH AND DIME 
  SIZED HAIL. THIS STORM WAS LOCATED 12 MILES SOUTH OF PARK 
  VALLEY...OR 39 MILES SOUTHWEST OF SNOWVILLE...AND MOVING EAST AT 
  20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  LOCOMOTIVE SPRINGS.

ADDITIONAL STRONG THUNDERSTORMS ARE DEVELOPING WEST OF THE MAIN 
STORM AND WILL ALSO BE CAPABLE OF PRODUCING WIND GUSTS IN EXCESS OF 
60 MPH AND DIME SIZED HAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

&&

LAT...LON 4144 11359 4163 11369 4190 11294 4159 11280
TIME...MOT...LOC 2252Z 256DEG 17KT 4164 11333 

$$

CRK
2 follow-up statements
799 
WWUS55 KSLC 082326
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
526 PM MDT FRI AUG 8 2014

UTC003-090000-
/O.CON.KSLC.SV.W.0021.000000T0000Z-140809T0000Z/
BOX ELDER UT-
526 PM MDT FRI AUG 8 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM MDT
FOR CENTRAL BOX ELDER COUNTY...

AT 525 PM MDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED 15 MILES SOUTH OF PARK VALLEY...OR 35 MILES SOUTHWEST OF
SNOWVILLE...MOVING EAST AT 10 MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY
THE DAMAGING WINDS.

LOCATIONS IMPACTED INCLUDE...
LOCOMOTIVE SPRINGS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH
AND/OR LARGE HAIL AT LEAST ONE INCH IN DIAMETER. FOR YOUR
PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS.

&&

LAT...LON 4146 11349 4164 11354 4184 11292 4159 11280
TIME...MOT...LOC 2325Z 274DEG 10KT 4161 11322 

$$
444 
WWUS55 KSLC 082356
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
556 PM MDT FRI AUG 8 2014

UTC003-090006-
/O.EXP.KSLC.SV.W.0021.000000T0000Z-140809T0000Z/
BOX ELDER UT-
556 PM MDT FRI AUG 8 2014

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BOX ELDER COUNTY WILL
EXPIRE AT 600 PM MDT...
        
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 4146 11349 4164 11354 4184 11292 4159 11280
TIME...MOT...LOC 2354Z 256DEG 17KT 4161 11322 

$$

CRK

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 8, 4:11 PM MDTSevere Thunderstorm WarningSLCBox Elder49 min
Aug 8, 5:57 PM MDTSevere Thunderstorm WarningSLCBox Elder48 min

Nearby

Severe Thunderstorm Warnings in Utah, 2014Every severe thunderstorm warning in 2014

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.