Alert archive / Utah / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 21, NWS Salt Lake City, UT

May 22, 2011Tooele County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at May 22, 2011, 5:20 PM MDT for Tooele County, Utah. It was in force for 55 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
May 22, 2011, 5:20 PM MDT (23:20 UTC)
Expired
May 22, 2011, 6:15 PM MDT
In force
55 min
Issued by
NWS Salt Lake City, UT
Area
Storm-based polygon

County Tooele County, UT

The radar

The Salt Lake City radar (KMTX), 109 km from the middle of the area, began a volume at 23:23 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, 11.3 hours before the alert went out and 76 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, Salt Lake City I, UT at 12:00Z on 2011-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 21 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salt Lake City I, UT at 12:00Z on 2011-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 square meters per square second.193958Sfc1 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
21 J/kg
Mixed-layer CIN
-81 J/kg
Mixed-layer LCL
1159 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
75 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.

336 
WUUS55 KSLC 222320
SVRSLC
UTC045-230015-
/O.NEW.KSLC.SV.W.0021.110522T2320Z-110523T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
520 PM MDT SUN MAY 22 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN TOOELE COUNTY IN UTAH

* UNTIL 615 PM MDT

* AT 518 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED NEAR
  DUGWAY...MOVING NORTHEAST AT 25 MPH. ADDITIONAL THUNDERSTORMS ARE  
  DEVELOPING JUST TO THE SOUTH OF THE MAIN STORM AND CAN BE EXPECTED 
  TO CONTINUE TO INTENSIFY.

* LOCATIONS IN THE WARNING INCLUDE...
  RUSH VALLEY AND STOCKTON
  FAUST
  GRANTSVILLE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

DAMAGING WINDS UP TO 70 MPH WERE REPORTED WEST OF DUGWAY WITH THIS 
STORM. THIS IS A DANGEROUS STORM...SEEK SAFE SHELTER AND STAY AWAY 
FROM WINDOWS!

&&

LAT...LON 4036 11310 4067 11241 4033 11217 4026 11219
      4023 11217 4008 11216 3995 11279
TIME...MOT...LOC 2319Z 245DEG 20KT 4026 11274

$$

CRK
1 follow-up statement
407 
WWUS55 KSLC 222346
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
546 PM MDT SUN MAY 22 2011

UTC045-230015-
/O.CON.KSLC.SV.W.0021.000000T0000Z-110523T0015Z/
TOOELE UT-
546 PM MDT SUN MAY 22 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM MDT
FOR EAST CENTRAL TOOELE COUNTY...

AT 542 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS
LOCATED NEAR RUSH VALLEY...OR ABOUT 15 MILES SOUTH OF TOOELE...MOVING
NORTHEAST AT 30 MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  STOCKTON
  GRANTSVILLE
  RUSH VALLEY

LAT...LON 4067 11241 4033 11217 4030 11219 4023 11217
      4008 11216 4000 11260 4042 11296
TIME...MOT...LOC 2346Z 244DEG 27KT 4035 11237

$$

CRK

The office that day

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

IssuedProductOfficeCountiesLasted
May 21, 8:35 PM MDTAreal Flood AdvisorySLCWeber3 hr
May 21, 8:42 PM MDTAreal Flood AdvisorySLCWeber3 hr
May 22, 4:16 AM MDTFlood WatchSLC4 days
May 22, 12:05 PM MDTAreal Flood WarningSLCWeber18 days
May 22, 3:27 PM MDTSevere Thunderstorm WarningSLCMillard48 min
May 22, 3:43 PM MDTSevere Thunderstorm WarningSLCJuab, Tooele47 min
May 22, 4:12 PM MDTSevere Thunderstorm WarningSLCMillard48 min
May 22, 4:28 PM MDTSpecial Weather StatementSLCJuab, Tooele47 min
May 22, 4:44 PM MDTSevere Thunderstorm WarningSLCTooele61 min
May 22, 4:50 PM MDTSevere Thunderstorm WarningSLCMillard55 min

Nearby

Severe Thunderstorm Warnings in Utah, 2011Every severe thunderstorm warning in 2011

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.