Alert archive / Utah / Tornado Warnings in 2011

Tornado Warning 2, NWS Salt Lake City, UT

September 16, 2011Washington County, Utah

NWS Salt Lake City, UT issued this tornado warning at Sep 16, 2011, 8:10 PM MDT for Washington County, Utah. It was in force for 20 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, 8:10 PM MDT (02:10 UTC)
Expired: Sep 16, 2011, 8:30 PM MDT
In force: 20 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon

County Washington County, UT

The radar

The Cedar City radar (KICX), 35 km from the middle of the area, began a volume at 02:12 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, 2.2 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.

714 
WFUS55 KSLC 170210
TORSLC
UTC053-170300-
/O.NEW.KSLC.TO.W.0002.110917T0210Z-110917T0300Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
810 PM MDT FRI SEP 16 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* TORNADO WARNING FOR...
  NORTH CENTRAL WASHINGTON COUNTY IN UTAH...

* UNTIL 900 PM MDT

* AT 804 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 7 MILES
  SOUTHWEST OF KOLOB CANYON...OR ABOUT 24 MILES SOUTHWEST OF CEDAR
  CITY...MOVING NORTHEAST AT 15 MPH.

* THE TORNADO WILL NEAR INSTERSTATE 15 NEAR KOLOB CANYON NORTH OF    
  PINTURA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

DO NOT USE HIGHWAY OVERPASSES FOR SHELTER. OVERPASSES DO NOT PROVIDE
PROTECTION FROM TORNADIC WINDS. VEHICLES STOPPED UNDER BRIDGES BLOCK
TRAFFIC AND PREVENT PEOPLE FROM GETTING OUT OF THE STORM'S PATH AND
TO SHELTER. IF YOU CANNOT DRIVE AWAY FROM THE TORNADO...GET OUT OF
YOUR VEHICLE AND LIE FLAT IN A DITCH AS A LAST RESORT.

DO NOT USE YOUR CAR TO TRY TO OUTRUN A TORNADO. CARS ARE EASILY
TOSSED AROUND BY TORNADO WINDS. IF YOU ARE CAUGHT IN THE PATH OF A
TORNADO...LEAVE THE CAR AND GO TO A STRONG BUILDING. IF NO SAFE
STRUCTURE IS NEARBY...SEEK SHELTER IN A DITCH OR LOW SPOT AND COVER
YOUR HEAD.

&&

LAT...LON 3748 11325 3748 11313 3747 11303 3737 11331
      3740 11334
TIME...MOT...LOC 0208Z 243DEG 12KT 3740 11331

$$

ROGOWSKI

2 follow-up statements

933 
WWUS55 KSLC 170220
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
820 PM MDT FRI SEP 16 2011

UTC053-170300-
/O.CON.KSLC.TO.W.0002.000000T0000Z-110917T0300Z/
WASHINGTON UT-
820 PM MDT FRI SEP 16 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 PM MDT FOR NORTH
CENTRAL WASHINGTON COUNTY...

AT 816 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THNUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS 
STORM WAS LOCATED NEAR INTERSTATE 15 AT KOLOB CANYON...OR ABOUT 21 
MILES SOUTHWEST OF CEDAR CITY...MOVING NORTHEAST AT 25 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT USE HIGHWAY OVERPASSES FOR SHELTER. OVERPASSES DO NOT PROVIDE
PROTECTION FROM TORNADIC WINDS. VEHICLES STOPPED UNDER BRIDGES BLOCK
TRAFFIC AND PREVENT PEOPLE FROM GETTING OUT OF THE STORM'S PATH AND
TO SHELTER. IF YOU CANNOT DRIVE AWAY FROM THE TORNADO...GET OUT OF
YOUR VEHICLE AND LIE FLAT IN A DITCH AS A LAST RESORT.

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

DO NOT USE YOUR CAR TO TRY TO OUTRUN A TORNADO. CARS ARE EASILY
TOSSED AROUND BY TORNADO WINDS. IF YOU ARE CAUGHT IN THE PATH OF A
TORNADO...LEAVE THE CAR AND GO TO A STRONG BUILDING. IF NO SAFE
STRUCTURE IS NEARBY...SEEK SHELTER IN A DITCH OR LOW SPOT AND COVER
YOUR HEAD.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

&&

LAT...LON 3748 11325 3748 11313 3747 11303 3737 11331
      3740 11334
TIME...MOT...LOC 0220Z 243DEG 20KT 3742 11322

$$

ROGOWSKI

167 
WWUS55 KSLC 170230
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
830 PM MDT FRI SEP 16 2011

UTC053-170238-
/O.CAN.KSLC.TO.W.0002.000000T0000Z-110917T0300Z/
WASHINGTON UT-
830 PM MDT FRI SEP 16 2011

...THE TORNADO WARNING FOR NORTH CENTRAL WASHINGTON COUNTY IS
CANCELLED...

THE STORM IS NO LONGER EXHIBITING SIGNS OF STRONG ROTATION. 
THEREFORE THE TORNADO WARNING HAS BEEN CANCELLED. THE SEVERE 
THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM.

LAT...LON 3748 11325 3748 11313 3747 11303 3737 11331
      3740 11334
TIME...MOT...LOC 0228Z 243DEG 20KT 3744 11317

$$

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, 8:02 PM MDT	Severe Thunderstorm Warning	SLC	Washington	43 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

Tornado Warnings in Utah, 2011 Every tornado warning in 2011 Tornadoes 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.