Alert archive / Utah / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 49, NWS Salt Lake City, UT

June 30, 2015Box Elder County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jun 30, 2015, 5:29 PM MDT for Box Elder County, Utah. It was in force for 61 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: Jun 30, 2015, 5:29 PM MDT (23:29 UTC)
Expired: Jun 30, 2015, 6:30 PM MDT
In force: 61 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), 111 km from the middle of the area, began a volume at 23:29 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, 11.5 hours before the alert went out and 91 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: 4 J/kg
Mixed-layer CIN: -363 J/kg
Mixed-layer LCL: 2457 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 99 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.

653 
WUUS55 KSLC 302329
SVRSLC
UTC003-010030-
/O.NEW.KSLC.SV.W.0049.150630T2329Z-150701T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
529 PM MDT TUE JUN 30 2015

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

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

* UNTIL 630 PM MDT

* AT 529 PM MDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
  OF 60 MPH. THIS STORM WAS LOCATED 26 MILES SOUTHWEST OF PARK 
  VALLEY...OR 33 MILES NORTHEAST OF MONTELLO...AND MOVING EAST 
  SOUTHEAST AT 20 MPH.

* THIS SEVERE THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
  WEST CENTRAL BOX ELDER COUNTY.

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 4157 11390 4175 11386 4170 11333 4141 11351
TIME...MOT...LOC 2329Z 281DEG 17KT 4165 11379 

$$

ROGOWSKI

1 follow-up statement

281 
WWUS55 KSLC 302352
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
552 PM MDT TUE JUN 30 2015

UTC003-010030-
/O.CON.KSLC.SV.W.0049.000000T0000Z-150701T0030Z/
BOX ELDER UT-
552 PM MDT TUE JUN 30 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM MDT
FOR WEST CENTRAL BOX ELDER COUNTY...

AT 551 PM MDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60
MPH. THIS STORM WAS LOCATED 21 MILES SOUTHWEST OF PARK VALLEY...OR 37
MILES NORTHEAST OF MONTELLO...MOVING EAST SOUTHEAST AT 20 MPH.

THIS STORM IS APPROACHING STATE ROUTE 30 BETWEEN LUCIN AND PARK 
VALLEY.

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 4157 11390 4175 11386 4170 11333 4141 11351
TIME...MOT...LOC 2351Z 281DEG 17KT 4163 11365 

$$

ROGOWSKI

Nearby

Severe Thunderstorm Warnings in Utah, 2015 Every severe thunderstorm warning in 2015

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.