Alert archive / Wyoming / Tornado Warnings in 2011

Tornado Warning 13, NWS Rapid City, SD

July 2, 2011Crook County, Weston County, Wyoming

NWS Rapid City, SD issued this tornado warning at Jul 2, 2011, 3:59 PM MDT for Crook County, Weston County, Wyoming. It was in force for 46 min. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Jul 2, 2011, 3:59 PM MDT (21:59 UTC)
Expired
Jul 2, 2011, 4:45 PM MDT
In force
46 min
Issued by
NWS Rapid City, SD
Area
Storm-based polygon

Counties Crook County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 138 km from the middle of the area, began a volume at 22:00 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.

What was reported inside it

TimeReportWhereRemark
Jul 2, 4:15 PM MDTHAIL 1.75Upton, WYLARGE HAIL DAMAGED HOMES AND VEHICLES.
Jul 2, 4:17 PM MDTHAIL 1.75Se Upton, WY
Jul 2, 4:25 PM MDTFUNNEL CLOUD5 Nnw Osage, WYDIRECTLY OVERHEAD
Jul 2, 4:35 PM MDTFUNNEL CLOUD5 Nnw Osage, WYSPOTTER IN OSAGE OBSERVED FUNNEL 5 NNW OSAGE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 2, 2:13 PM MDTTornado WatchSPC8 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 10.0 hours before the alert went out and 134 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, Rapid City, SD at 12:00Z on 2011-07-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 829 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 12:00Z on 2011-07-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 square meters per square second.1939Sfc1 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
829 J/kg
Mixed-layer CIN
-69 J/kg
Mixed-layer LCL
993 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
41 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

229 
WFUS53 KUNR 022159
TORUNR
WYC011-045-022245-
/O.NEW.KUNR.TO.W.0013.110702T2159Z-110702T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE RAPID CITY SD
359 PM MDT SAT JUL 2 2011

THE NATIONAL WEATHER SERVICE IN RAPID CITY HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTH CENTRAL CROOK COUNTY IN NORTHEASTERN WYOMING...
  NORTH CENTRAL WESTON COUNTY IN NORTHEASTERN WYOMING...

* UNTIL 445 PM MDT

* AT 356 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 7 MILES SOUTHWEST OF UPTON...OR 28 MILES
  NORTHWEST OF DOWNTOWN NEWCASTLE...AND MOVING NORTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  UPTON AND INYAN KARA MOUNTAIN.

THIS INCLUDES INTERSTATE 90 BETWEEN WYOMING MILE MARKERS 175 AND
181...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4439 10451 4418 10420 4392 10469 4404 10486
TIME...MOT...LOC 2159Z 224DEG 18KT 4404 10470

$$

CALDERON
3 follow-up statements
376 
WWUS53 KUNR 022215
SVSUNR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RAPID CITY SD
415 PM MDT SAT JUL 2 2011

WYC011-045-022245-
/O.CON.KUNR.TO.W.0013.000000T0000Z-110702T2245Z/
WESTON WY-CROOK WY-
415 PM MDT SAT JUL 2 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL CROOK AND
NORTH CENTRAL WESTON COUNTIES UNTIL 445 PM MDT...

AT 412 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS 
STORM WAS LOCATED NEAR UPTON...OR 25 MILES NORTHWEST OF DOWNTOWN 
NEWCASTLE...MOVING NORTHEAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  UPTON...INYAN KARA MOUNTAIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4398 10459 4409 10474 4436 10447 4418 10420
TIME...MOT...LOC 2216Z 225DEG 27KT 4407 10459

$$

CALDERON
412 
WWUS53 KUNR 022232
SVSUNR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RAPID CITY SD
432 PM MDT SAT JUL 2 2011

WYC011-045-022245-
/O.CON.KUNR.TO.W.0013.000000T0000Z-110702T2245Z/
WESTON WY-CROOK WY-
432 PM MDT SAT JUL 2 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL CROOK AND
NORTH CENTRAL WESTON COUNTIES UNTIL 445 PM MDT...

AT 429 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR UPTON...OR 23 MILES NORTHWEST OF DOWNTOWN
NEWCASTLE...MOVING NORTHEAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  INYAN KARA MOUNTAIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4407 10462 4426 10439 4416 10424 4400 10456
TIME...MOT...LOC 2233Z 242DEG 13KT 4407 10454

$$

CALDERON
214 
WWUS53 KUNR 022243
SVSUNR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RAPID CITY SD
443 PM MDT SAT JUL 2 2011

WYC011-045-022251-
/O.EXP.KUNR.TO.W.0013.000000T0000Z-110702T2245Z/
WESTON WY-CROOK WY-
443 PM MDT SAT JUL 2 2011

...THE TORNADO WARNING FOR SOUTH CENTRAL CROOK AND NORTH CENTRAL
WESTON COUNTIES WILL EXPIRE AT 445 PM MDT/545 PM CDT/...

THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS
EXPIRED. HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT
FOR THE AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 1000 PM MDT.

REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CROOK 
AND WESTON COUNTIES UNTIL 530 PM MDT.

LAT...LON 4407 10462 4426 10439 4416 10424 4400 10456
TIME...MOT...LOC 2241Z 242DEG 13KT 4408 10450

$$

CALDERON

The office that day

Everything else NWS Rapid City, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 2, 2:26 PM MDTSevere Thunderstorm WarningUNRCampbell, Crook64 min
Jul 2, 2:37 PM MDTSevere Thunderstorm WarningUNRCampbell, Weston53 min
Jul 2, 2:51 PM MDTSevere Thunderstorm WarningUNRCrook39 min
Jul 2, 2:57 PM MDTFlash Flood WarningUNRCampbell, Crook4 hr
Jul 2, 3:23 PM MDTSevere Thunderstorm WarningUNRCrook, Weston67 min
Jul 2, 3:27 PM MDTSevere Thunderstorm WarningUNRCrook63 min
Jul 2, 4:27 PM MDTSevere Thunderstorm WarningUNRCrook, Weston63 min
Jul 2, 4:30 PM MDTFlash Flood WarningUNRCrook, Weston6 hr
Jul 2, 4:50 PM MDTTornado WarningUNRCrook, Weston23 min
Jul 2, 4:53 PM MDTTornado WarningUNRWeston52 min
Jul 2, 5:01 PM MDTSevere Thunderstorm WarningUNRWeston59 min
Jul 2, 5:35 PM MDTSevere Thunderstorm WarningUNRWeston40 min
Jul 2, 5:52 PM MDTTornado WarningUNRWeston21 min

Nearby

Tornado Warnings in Wyoming, 2011Every tornado warning in 2011Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.