Alert archive / Wyoming / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 73, NWS Cheyenne, WY

July 5, 2012Converse County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 5, 2012, 3:11 PM MDT for Converse County, Wyoming. It was in force for 39 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: Jul 5, 2012, 3:11 PM MDT (21:11 UTC)
Expired: Jul 5, 2012, 3:50 PM MDT
In force: 39 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Converse County, WY

The radar

The Riverton/Lander radar (KRIW), 213 km from the middle of the area, began a volume at 21:13 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

Riverton, WY (KRIW), launched 12:00Z, 9.2 hours before the alert went out and 207 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: 34 J/kg
Mixed-layer CIN: -190 J/kg
Mixed-layer LCL: 2588 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 102 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.

401 
WUUS55 KCYS 052111
SVRCYS
WYC009-052200-
/O.NEW.KCYS.SV.W.0073.120705T2111Z-120705T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
311 PM MDT THU JUL 5 2012

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL CONVERSE COUNTY IN EAST CENTRAL WYOMING...

* UNTIL 400 PM MDT

* AT 308 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  ROLLING HILLS ESTATES...OR 18 MILES EAST OF EVANSVILLE...AND MOVING
  NORTH AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF WESTERN CONVERSE COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 4316 10570 4287 10577 4287 10603 4317 10608
TIME...MOT...LOC 2111Z 180DEG 14KT 4293 10591
WIND...HAIL 60MPH 1.00IN

$$

MAZUR

2 follow-up statements

838 
WWUS55 KCYS 052132
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
332 PM MDT THU JUL 5 2012

WYC009-052200-
/O.CON.KCYS.SV.W.0073.000000T0000Z-120705T2200Z/
CONVERSE WY-
332 PM MDT THU JUL 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WEST CENTRAL
CONVERSE COUNTY UNTIL 400 PM MDT...

AT 328 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES
NORTH OF ROLLING HILLS ESTATES...OR 21 MILES NORTHEAST OF
EVANSVILLE...MOVING NORTH AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF WESTERN CONVERSE COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS IF YOU ARE IN
THE PATH OF THIS STORM. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 4317 10607 4316 10570 4287 10577 4287 10603
      4290 10603
TIME...MOT...LOC 2132Z 197DEG 13KT 4300 10587
WIND...HAIL 60MPH 1.00IN

$$

MAZUR

696 
WWUS55 KCYS 052150
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
350 PM MDT THU JUL 5 2012

WYC009-052200-
/O.CAN.KCYS.SV.W.0073.000000T0000Z-120705T2200Z/
CONVERSE WY-
350 PM MDT THU JUL 5 2012

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL CONVERSE COUNTY
IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
 HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4317 10607 4316 10570 4287 10577 4287 10603
      4290 10603
TIME...MOT...LOC 2150Z 197DEG 13KT 4306 10584

$$

MAZUR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 8:43 PM MDT	Special Weather Statement	CYS	Albany	32 min
Jul 4, 8:52 PM MDT	Severe Thunderstorm Warning	CYS	Albany	20 min
Jul 4, 9:23 PM MDT	Special Weather Statement	CYS	Albany	37 min
Jul 5, 2:44 PM MDT	Special Weather Statement	CYS	Albany	31 min
Jul 5, 2:50 PM MDT	Special Weather Statement	CYS		25 min
Jul 5, 3:01 PM MDT	Special Weather Statement	CYS	Converse	29 min
Jul 5, 3:02 PM MDT	Special Weather Statement	CYS	Converse	28 min
Jul 5, 3:21 PM MDT	Special Weather Statement	CYS		24 min
Jul 5, 3:48 PM MDT	Special Weather Statement	CYS	Platte	42 min
Jul 5, 3:55 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Converse	50 min
Jul 5, 4:01 PM MDT	Special Weather Statement	CYS	Converse	44 min
Jul 5, 4:39 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Platte	51 min
Jul 5, 4:47 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Converse, Platte	43 min
Jul 5, 5:02 PM MDT	Flash Flood Warning	CYS	Albany	5 hr
Jul 5, 5:26 PM MDT	Special Weather Statement	CYS	Platte	49 min
Jul 5, 5:44 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara, Platte	46 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2012 Every severe thunderstorm warning in 2012

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.