Alert archive / Wyoming / Tornado Warnings in 2008

Tornado Warning 2, NWS Riverton, WY

May 7, 2008Natrona County, Wyoming

NWS Riverton, WY issued this tornado warning at May 7, 2008, 3:08 PM MDT for Natrona County, Wyoming. It was in force for 37 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: May 7, 2008, 3:08 PM MDT (21:08 UTC)
Expired: May 7, 2008, 3:45 PM MDT
In force: 37 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon

County Natrona County, WY

The radar

The Riverton/Lander radar (KRIW), 187 km from the middle of the area, began a volume at 21:11 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

Time	Report	Where	Remark
May 7, 3:12 PM MDT	TORNADO	Casper, WY	CAR WAS LIFTED AND SURROUNDED BY DEBRIS ON WYOMING BOULEVARD BETWEEN CASPER MOUNTAIN ROAD AND MCKINLEY.
May 7, 3:48 PM MDT	HAIL 0.75	10 W Glenrock, WY	I-25 MM 175
May 7, 3:48 PM MDT	HAIL 0.75	10 W Glenrock, WY
May 7, 3:48 PM MDT	HAIL 0.75	11 W Glenrock, WY	I-25 MM 175

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

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 9.1 hours before the alert went out and 181 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: 1847 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 171 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.

000 
WFUS55 KRIW 072108
TORRIW
WYC025-072145-
/O.NEW.KRIW.TO.W.0002.080507T2108Z-080507T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE RIVERTON WY
308 PM MDT WED MAY 7 2008

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL NATRONA COUNTY IN CENTRAL WYOMING...
  THIS INCLUDES THE CITIES OF...EVANSVILLE...CASPER...

* UNTIL 345 PM MDT

* AT 307 PM MDT...COUNTY EMERGENCY MANAGEMENT REPORTED A TORNADO NEAR
  CASPER...MOVING EAST AT 18 MPH.

* THE TORNADO WILL BE NEAR...
  EVANSVILLE BY 315 PM MDT...
  I25 EXIT 182 BY 320 PM MDT...
  EDNESS K WILKINS STATE PARK BY 330 PM MDT...

MOVE INTO A BASEMENT OR INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY
BUILDING. ABANDON MOBILE HOMES AND VEHICLES.

THIS IS A DANGEROUS STORM ACT QUICKLY. IF YOU ARE IN THE PATH OF
THIS TORNADO MOVE TO THE LOWEST FLOOR OF A STURDY BUILDING.

DO NOT USE YOUR CAR TO ATTEMPT TO OUTRUN A TORNADO. MOTORISTS SHOULD
LOOK FOR SHELTER IN A SUBSTANTIAL BUILDING. AS A LAST RESORT...TAKE
COVER IN A DITCH OR LOW SPOT. OVERPASSES ARE NOT SAFE.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4269 10634 4285 10646 4304 10607 4302 10604
      4280 10605 4279 10607
TIME...MOT...LOC 2108Z 253DEG 16KT 4281 10629

$$

MCDONALD

4 follow-up statements

000 
WWUS55 KRIW 072114
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
313 PM MDT WED MAY 7 2008

WYC025-072145-
/O.CON.KRIW.TO.W.0002.000000T0000Z-080507T2145Z/
NATRONA WY-
313 PM MDT WED MAY 7 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 345 PM MDT FOR EAST
CENTRAL NATRONA COUNTY...

AT 311 PM MDT...COUNTY EMERGENCY MANAGEMENT REPORTED A VERY LARGE 
FUNNEL CLOUD. THIS POTENTIAL TORNADO WAS LOCATED JUST SOUTH  
EASTRIDGE MALL...OR ON THE SOUTHEAST SIDE OF CASPER NEAR THE 
MCMURRAY BUSINESS PARK...MOVING EAST AT 20 MPH.

THE POTENTIAL TORNADO WILL BE NEAR...
  I25 EXIT 182 BY 320 PM MDT...
  EDNESS K WILKINS STATE PARK BY 325 PM MDT...

GOLFBALL SIZE HAIL HAS BEEN REPORTED ALL AROUND CASPER AS WELL.

MOVE INTO A BASEMENT OR INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY
BUILDING. ABANDON MOBILE HOMES AND VEHICLES.

THIS IS A DANGEROUS STORM ACT QUICKLY. IF YOU ARE IN THE PATH OF
THIS TORNADO MOVE TO THE LOWEST FLOOR OF A STURDY BUILDING.

DO NOT USE YOUR CAR TO ATTEMPT TO OUTRUN A TORNADO. MOTORISTS SHOULD
LOOK FOR SHELTER IN A SUBSTANTIAL BUILDING. AS A LAST RESORT...TAKE
COVER IN A DITCH OR LOW SPOT. OVERPASSES ARE NOT SAFE.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4279 10607 4273 10624 4289 10637 4304 10607
      4302 10604 4280 10605
TIME...MOT...LOC 2113Z 256DEG 17KT 4282 10626

$$

MCDONALD

000 
WWUS55 KRIW 072125
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
323 PM MDT WED MAY 7 2008

WYC025-072145-
/O.CON.KRIW.TO.W.0002.000000T0000Z-080507T2145Z/
NATRONA WY-
323 PM MDT WED MAY 7 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 345 PM MDT FOR EAST
CENTRAL NATRONA COUNTY...

AT 320 PM MDT...COUNTY EMERGENCY MANAGEMENT REPORTED A LARGE FUNNEL 
CLOUD ON THE SOUTHEAST SIDE OF CASPER. THE POTENTIAL TORNADO WAS 
LOCATED NEAR I25 EXIT 182...OR JUST EAST OF EVANSVILLE...MOVING EAST 
AT 23 MPH.

THE TORNADO WILL BE NEAR...
  EDNESS A WILKINS STATE PARK AT 335 PM MDT

GOLFBALL SIZE HAIL HAS BEEN REPORTED ALL AROUND CASPER AS WELL.

MOVE INTO A BASEMENT OR INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY
BUILDING. ABANDON MOBILE HOMES AND VEHICLES.

THIS IS A DANGEROUS STORM ACT QUICKLY. IF YOU ARE IN THE PATH OF
THIS TORNADO MOVE TO THE LOWEST FLOOR OF A STURDY BUILDING.

DO NOT USE YOUR CAR TO ATTEMPT TO OUTRUN A TORNADO. MOTORISTS SHOULD
LOOK FOR SHELTER IN A SUBSTANTIAL BUILDING. AS A LAST RESORT...TAKE
COVER IN A DITCH OR LOW SPOT. OVERPASSES ARE NOT SAFE.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4279 10607 4277 10623 4291 10631 4304 10607
      4302 10604 4280 10605
TIME...MOT...LOC 2123Z 259DEG 20KT 4284 10618

$$

MCDONALD

000 
WWUS55 KRIW 072136
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
335 PM MDT WED MAY 7 2008

WYC025-072145-
/O.CON.KRIW.TO.W.0002.000000T0000Z-080507T2145Z/
NATRONA WY-
335 PM MDT WED MAY 7 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 345 PM MDT FOR EAST
CENTRAL NATRONA COUNTY...

AT 333 PM MDT...COUNTY EMERGENCY MANAGEMENT AND THE LOCAL PUBLIC 
REPORTED A VERY LARGE FUNNEL CLOUD. THE POTENTIAL TORNADO WAS 
LOCATED OVER EXTREME EAST CENTRAL NATRONA COUNTY...OR ABOUT 8 MILES 
EAST OF EVANSVILLE...MOVING EAST AT 25 MPH.  NICKEL SIZE HAIL WAS 
REPORTED AT I 25 AND HAT SIX ROAD.

MOVE INTO A BASEMENT OR INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY
BUILDING. ABANDON MOBILE HOMES AND VEHICLES.

THIS IS A DANGEROUS STORM ACT QUICKLY. IF YOU ARE IN THE PATH OF
THIS TORNADO MOVE TO THE LOWEST FLOOR OF A STURDY BUILDING.

DO NOT USE YOUR CAR TO ATTEMPT TO OUTRUN A TORNADO. MOTORISTS SHOULD
LOOK FOR SHELTER IN A SUBSTANTIAL BUILDING. AS A LAST RESORT...TAKE
COVER IN A DITCH OR LOW SPOT. OVERPASSES ARE NOT SAFE.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4279 10607 4279 10616 4293 10620 4299 10608
      4298 10605 4280 10605
TIME...MOT...LOC 2135Z 258DEG 26KT 4286 10608

$$

MCDONALD

000 
WWUS55 KRIW 072142
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
341 PM MDT WED MAY 7 2008

WYC025-072151-
/O.EXP.KRIW.TO.W.0002.000000T0000Z-080507T2145Z/
NATRONA WY-
341 PM MDT WED MAY 7 2008

...THE TORNADO WARNING FOR EAST CENTRAL NATRONA COUNTY EXPIRES AT 345
PM MDT...

THE STORM HAS EXITED THE WARNED AREA. THEREFORE...THE WARNING WILL BE
ALLOWED TO EXPIRE.

OVER THE NEXT FEW MINUTES...BRIEF HEAVY RAIN AND NICKEL SIZE HAIL 
ARE STILL POSSIBLE ALONG THE NATRONA CONVERSE COUNTY LINE.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4279 10607 4279 10616 4293 10620 4299 10608
      4298 10605 4280 10605
TIME...MOT...LOC 2141Z 258DEG 26KT 4287 10602

$$

MCDONALD

The office that day

Everything else NWS Riverton, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 7, 12:52 PM MDT	Special Weather Statement	RIW	Natrona	53 min
May 7, 1:46 PM MDT	Special Weather Statement	RIW	Natrona	44 min
May 7, 2:11 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	49 min
May 7, 2:23 PM MDT	Special Weather Statement	RIW	Natrona	67 min
May 7, 2:44 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	46 min
May 7, 2:54 PM MDT	Special Weather Statement	RIW		36 min
May 7, 3:54 PM MDT	Special Weather Statement	RIW	Natrona	51 min

Nearby

Tornado Warnings in Wyoming, 2008 Every tornado warning in 2008 Tornadoes in 2008

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.