Alert archive / Wyoming / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 21, NWS Riverton, WY

June 12, 2013Johnson County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jun 12, 2013, 5:42 PM MDT for Johnson County, Wyoming. It was in force for 48 min. 1 report 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: Jun 12, 2013, 5:42 PM MDT (23:42 UTC)
Expired: Jun 12, 2013, 6:30 PM MDT
In force: 48 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 50.0 mph

County Johnson County, WY

The radar

The Riverton/Lander radar (KRIW), 226 km from the middle of the area, began a volume at 23:41 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
Jun 12, 5:44 PM MDT	HAIL 1.25	5 Nw U.S. Hwy 16 Mile M, WY

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, 11.7 hours before the alert went out and 221 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: 2227 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 95 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.

063 
WUUS55 KRIW 122342
SVRRIW
WYC019-130030-
/O.NEW.KRIW.SV.W.0021.130612T2342Z-130613T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RIVERTON WY
542 PM MDT WED JUN 12 2013

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A

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

* UNTIL 630 PM MDT

* AT 537 PM MDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR I90 EXIT
  53...AND MOVING NORTHEAST AT 30 MPH.

  HAZARD...QUARTER SIZE HAIL.

  SOURCE...RADAR INDICATED.

  IMPACT...DAMAGE TO VEHICLES IS EXPECTED.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  I90 MILE MARKER 60 AROUND 550 PM MDT.

OTHER LOCATIONS IN THE WARNING INCLUDE U.S. HWY 16.

THIS INCLUDES INTERSTATE 90 IN WYOMING BETWEEN MILE MARKERS 50 AND
62.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS!

&&

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

LAT...LON 4441 10602 4427 10691 4438 10696 4456 10653
      4457 10635 4457 10620
TIME...MOT...LOC 2342Z 241DEG 26KT 4439 10676

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...<50MPH

$$

LIPSON

1 follow-up statement

478 
WWUS55 KRIW 130008
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
608 PM MDT WED JUN 12 2013

WYC019-130030-
/O.CON.KRIW.SV.W.0021.000000T0000Z-130613T0030Z/
JOHNSON WY-
608 PM MDT WED JUN 12 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
JOHNSON COUNTY UNTIL 630 PM MDT...

AT 607 PM MDT...A SEVERE THUNDERSTORM WAS LOCATED 13 MILES NORTHEAST
OF I90 MILE MARKER 60...AND MOVING EAST AT 40 MPH.

HAZARD...HALF DOLLAR SIZE HAIL.

SOURCE...RADAR INDICATED.

IMPACT...DAMAGE TO VEHICLES IS EXPECTED.

THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF
NORTHEASTERN JOHNSON COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

LARGE HAIL AND CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING 
WITH THIS STORM. MOVE INDOORS IMMEDIATELY. LIGHTNING KILLS. 
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE 
STRUCK BY LIGHTNING.

TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS!

&&

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

LAT...LON 4441 10602 4433 10651 4433 10655 4448 10660
      4456 10653 4457 10635 4457 10620
TIME...MOT...LOC 0008Z 257DEG 35KT 4444 10641

TORNADO...POSSIBLE
HAIL...1.25IN
WIND...<50MPH

$$

LIPSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 8:02 AM MDT	Special Weather Statement	RIW		43 min
Jun 12, 11:28 AM MDT	Special Weather Statement	RIW		32 min
Jun 12, 3:21 PM MDT	Severe Thunderstorm Warning	RIW	Teton	39 min
Jun 12, 3:57 PM MDT	Special Weather Statement	RIW	Teton	48 min
Jun 12, 4:41 PM MDT	Special Weather Statement	RIW	Big Horn	49 min
Jun 12, 4:45 PM MDT	Special Weather Statement	RIW		45 min
Jun 12, 5:01 PM MDT	Special Weather Statement	RIW		44 min
Jun 12, 5:05 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn	55 min
Jun 12, 5:36 PM MDT	Special Weather Statement	RIW	Johnson	54 min
Jun 12, 5:37 PM MDT	Special Weather Statement	RIW		23 min
Jun 12, 5:49 PM MDT	Special Weather Statement	RIW	Teton	41 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2013 Every severe thunderstorm warning in 2013

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.