Alert archive / Wyoming / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 21, NWS Riverton, WY

June 2, 2008Johnson County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jun 2, 2008, 2:48 PM MDT for Johnson County, Wyoming. It was in force for 42 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: Jun 2, 2008, 2:48 PM MDT (20:48 UTC)
Expired: Jun 2, 2008, 3:30 PM MDT
In force: 42 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon

County Johnson County, WY

The radar

The Riverton/Lander radar (KRIW), 233 km from the middle of the area, began a volume at 20:49 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jun 2, 2:36 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 8.8 hours before the alert went out and 227 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: 45 J/kg
Mixed-layer CIN: -225 J/kg
Mixed-layer LCL: 1673 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 158 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 
WUUS55 KRIW 022048
SVRRIW
WYC019-022130-
/O.NEW.KRIW.SV.W.0021.080602T2048Z-080602T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RIVERTON WY
248 PM MDT MON JUN 2 2008

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL JOHNSON COUNTY IN NORTH CENTRAL WYOMING...

* UNTIL 330 PM MDT

* AT 245 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  I90 EXIT 82...OR ABOUT 28 MILES SOUTHEAST OF BUFFALO...AND MOVING
  NORTHEAST AT 26 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  I90 EXIT 88 AND POWDER RIVER REST AREA BY 300 PM...
  I90 EXIT 91 BY 305 PM...
  I90 MILE MARKER 95 BY 310 PM...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR
DAMAGING WINDS...LARGE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING.
TAKE COVER IN A STURDY STRUCTURE UNTIL THE STORM PASSES.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM MDT
MONDAY EVENING FOR NORTH CENTRAL WYOMING.

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

LAT...LON 4436 10599 4418 10600 4416 10597 4414 10597
      4403 10623 4417 10638 4439 10602
TIME...MOT...LOC 2048Z 234DEG 22KT 4415 10620

$$

LIPSON

2 follow-up statements

000 
WWUS55 KRIW 022110
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
309 PM MDT MON JUN 2 2008

WYC019-022130-
/O.CON.KRIW.SV.W.0021.000000T0000Z-080602T2130Z/
JOHNSON WY-
309 PM MDT MON JUN 2 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM MDT
FOR EAST CENTRAL JOHNSON COUNTY...

AT 306 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR I90 EXIT 91...OR ABOUT 32 MILES WEST OF GILLETTE...
MOVING EAST AT 16 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  I90 MILE MARKER 95 BY 325 PM MDT...

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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM MDT 
MONDAY EVENING FOR NORTH CENTRAL WYOMING.

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

LAT...LON 4418 10600 4416 10597 4412 10597 4410 10608
      4405 10618 4406 10619 4421 10626 4428 10600
TIME...MOT...LOC 2109Z 253DEG 14KT 4415 10610

$$

LIPSON

000 
WWUS55 KRIW 022129
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
329 PM MDT MON JUN 2 2008

WYC019-022139-
/O.EXP.KRIW.SV.W.0021.000000T0000Z-080602T2130Z/
JOHNSON WY-
329 PM MDT MON JUN 2 2008

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL JOHNSON COUNTY
EXPIRES AT 330 PM MDT...

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM MDT
MONDAY EVENING FOR NORTH CENTRAL WYOMING.

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

LAT...LON 4418 10600 4416 10597 4412 10597 4410 10608
      4405 10618 4406 10619 4421 10626 4428 10600
TIME...MOT...LOC 2129Z 253DEG 14KT 4417 10600

$$

LIPSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 1, 6:01 PM MDT	Special Weather Statement	RIW	Teton	59 min
Jun 1, 6:06 PM MDT	Special Weather Statement	RIW	Washakie	54 min
Jun 1, 7:11 PM MDT	Special Weather Statement	RIW	Johnson	64 min
Jun 1, 8:55 PM MDT	Special Weather Statement	RIW	Teton	65 min
Jun 1, 9:45 PM MDT	Special Weather Statement	RIW	Teton	60 min
Jun 1, 11:30 PM MDT	Special Weather Statement	RIW	Johnson	60 min
Jun 2, 12:42 AM MDT	Special Weather Statement	RIW	Johnson	63 min
Jun 2, 2:17 PM MDT	Special Weather Statement	RIW	Natrona	58 min
Jun 2, 2:22 PM MDT	Special Weather Statement	RIW	Big Horn	53 min
Jun 2, 2:22 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	38 min
Jun 2, 2:34 PM MDT	Special Weather Statement	RIW	Johnson	41 min
Jun 2, 3:00 PM MDT	Special Weather Statement	RIW	Big Horn	60 min
Jun 2, 4:07 PM MDT	Special Weather Statement	RIW	Big Horn	53 min
Jun 2, 5:29 PM MDT	Special Weather Statement	RIW		61 min
Jun 2, 5:32 PM MDT	Special Weather Statement	RIW	Teton	58 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2008 Every severe thunderstorm warning 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.