Alert archive / Utah / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 85, NWS Salt Lake City, UT

September 16, 2011Washington County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 16, 2011, 8:02 PM MDT for Washington County, Utah. It was in force for 43 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: Sep 16, 2011, 8:02 PM MDT (02:02 UTC)
Expired: Sep 16, 2011, 8:45 PM MDT
In force: 43 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon

County Washington County, UT

The radar

The Cedar City radar (KICX), 36 km from the middle of the area, began a volume at 02:04 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

Las Vegas, NV (KVEF), launched 00:00Z, 2.0 hours before the alert went out and 238 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: 3726 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 50 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.

233 
WUUS55 KSLC 170202
SVRSLC
UTC053-170245-
/O.NEW.KSLC.SV.W.0085.110917T0202Z-110917T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
802 PM MDT FRI SEP 16 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL WASHINGTON COUNTY IN UTAH

* UNTIL 845 PM MDT

* AT 759 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
  PINTURA...OR 23 MILES SOUTHWEST OF CEDAR CITY...MOVING NORTHEAST AT
  15 MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  INTERSTATE 15
  KOLOB CANYON

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 3752 11326 3748 11324 3748 11306 3744 11306
      3731 11330 3738 11340
TIME...MOT...LOC 0202Z 233DEG 13KT 3740 11329

$$

ROGOWSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 16, 7:42 PM MDT	Severe Thunderstorm Warning	SLC	Washington	48 min
Sep 16, 8:10 PM MDT	Tornado Warning	SLC	Washington	20 min
Sep 16, 9:27 PM MDT	Severe Thunderstorm Warning	SLC	Iron, Washington	38 min
Sep 17, 9:01 AM MDT	Areal Flood Advisory	SLC	Emery, Sevier, Wayne	4 hr
Sep 17, 5:25 PM MDT	Flash Flood Warning	SLC	Garfield, Wayne	3 hr

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.