Alert archive / Utah / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 13, NWS Salt Lake City, UT

April 21, 2011Carbon County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Apr 21, 2011, 2:16 PM MDT for Carbon County, Utah. It was in force for 29 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: Apr 21, 2011, 2:16 PM MDT (20:16 UTC)
Expired: Apr 21, 2011, 2:45 PM MDT
In force: 29 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon

County Carbon County, UT

The radar

The Grand Junction radar (KGJX), 173 km from the middle of the area, began a volume at 20:16 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, 8.3 hours before the alert went out and 148 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 899 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 104 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.

650 
WUUS55 KSLC 212016
SVRSLC
UTC007-212045-
/O.NEW.KSLC.SV.W.0013.110421T2016Z-110421T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
216 PM MDT THU APR 21 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN CARBON COUNTY IN UTAH

* UNTIL 245 PM MDT

* AT 212 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  EAST CARBON...OR 28 MILES EAST OF PRICE...MOVING NORTHEAST AT 35
  MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  SUNNYSIDE
  RURAL EASTERN CARBON COUNTY

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.

&&

LAT...LON 3969 10999 3966 10997 3954 11003 3946 11018
      3947 11037 3959 11046 3982 11003 3982 10990
      3979 10987
TIME...MOT...LOC 2016Z 236DEG 31KT 3956 11026

$$

CRK

1 follow-up statement

304 
WWUS55 KSLC 212031
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
231 PM MDT THU APR 21 2011

UTC007-212045-
/O.CON.KSLC.SV.W.0013.000000T0000Z-110421T2045Z/
CARBON UT-
231 PM MDT THU APR 21 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM MDT
FOR EASTERN CARBON COUNTY...

AT 226 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED OVER EAST CENTRAL CARBON COUNTY...OR ABOUT 35 MILES EAST OF
PRICE...MOVING NORTHEAST AT 35 MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  RURAL EASTERN CARBON COUNTY

LAT...LON 3976 10991 3969 10999 3966 10997 3954 11003
      3946 11018 3964 11037 3982 11003 3982 10990
      3980 10988
TIME...MOT...LOC 2031Z 236DEG 31KT 3963 11012

$$

CRK

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 10:41 AM MDT	Wind Advisory	SLC		10 hr
Apr 21, 11:03 AM MDT	Special Weather Statement	SLC	Tooele	57 min
Apr 21, 11:12 AM MDT	Severe Thunderstorm Warning	SLC	Box Elder, Tooele	48 min
Apr 21, 11:39 AM MDT	Special Weather Statement	SLC	Rich	51 min
Apr 21, 11:55 AM MDT	Special Weather Statement	SLC	Tooele	50 min
Apr 21, 12:12 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder, Tooele	48 min
Apr 21, 12:25 PM MDT	High Wind Warning	SLC		6 hr
Apr 21, 12:29 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder	46 min
Apr 21, 12:33 PM MDT	Special Weather Statement	SLC	Rich	27 min
Apr 21, 12:37 PM MDT	Severe Thunderstorm Warning	SLC	Juab, Tooele	23 min
Apr 21, 12:43 PM MDT	Severe Thunderstorm Warning	SLC	Davis, Weber	17 min
Apr 21, 12:52 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder, Cache, Davis, Morgan, Tooele, Weber	23 min
Apr 21, 12:55 PM MDT	Severe Thunderstorm Warning	SLC	Juab, Morgan, Salt Lake, Tooele, Utah	35 min
Apr 21, 1:12 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder, Cache, Davis, Morgan, Salt Lake, Tooele and 1 more	48 min
Apr 21, 1:24 PM MDT	Severe Thunderstorm Warning	SLC	Juab, Salt Lake, Tooele, Utah	36 min
Apr 21, 1:45 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder, Cache, Davis, Morgan, Rich, Salt Lake and 3 more	30 min
Apr 21, 1:55 PM MDT	Special Weather Statement	SLC	Utah, Wasatch	50 min
Apr 21, 2:10 PM MDT	Special Weather Statement	SLC	Carbon	50 min
Apr 21, 2:14 PM MDT	Severe Thunderstorm Warning	SLC	Cache, Morgan, Rich, Summit	46 min
Apr 21, 2:41 PM MDT	Severe Thunderstorm Warning	SLC	Rich	35 min
Apr 21, 2:44 PM MDT	Severe Thunderstorm Warning	SLC	Carbon	16 min

Nearby

Severe Thunderstorm Warnings in Utah, 2011 Every 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.