Alert archive / Wyoming / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 72, NWS Cheyenne, WY

July 4, 2012Albany County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 4, 2012, 8:52 PM MDT for Albany County, Wyoming. It was in force for 20 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 4, 2012, 8:52 PM MDT (02:52 UTC)
Expired: Jul 4, 2012, 9:12 PM MDT
In force: 20 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Albany County, WY

The radar

The Cheyenne radar (KCYS), 101 km from the middle of the area, began a volume at 02:55 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 00:00Z, 2.9 hours before the alert went out and 269 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: 263 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 3908 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 51 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.

127 
WUUS55 KCYS 050252
SVRCYS
WYC001-050330-
/O.NEW.KCYS.SV.W.0072.120705T0252Z-120705T0330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
852 PM MDT WED JUL 4 2012

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL ALBANY COUNTY IN SOUTHEAST WYOMING...

* UNTIL 930 PM MDT

* AT 850 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL AND   
  WINDS UP TO 50 MPH.  THIS STORM WAS LOCATED 6 MILES NORTH OF       
  LAKE HATTIE RESERVOIR...OR 18 MILES WEST OF LARAMIE...AND MOVING   
  NORTH AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF CENTRAL ALBANY COUNTY.

THIS INCLUDES INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 285 AND
298.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4158 10605 4158 10575 4131 10583 4131 10601
TIME...MOT...LOC 0252Z 182DEG 14KT 4134 10592
WIND...HAIL <50MPH 1.00IN

$$

MAZUR

1 follow-up statement

267 
WWUS55 KCYS 050312
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
912 PM MDT WED JUL 4 2012

WYC001-050322-
/O.CAN.KCYS.SV.W.0072.000000T0000Z-120705T0330Z/
ALBANY WY-
912 PM MDT WED JUL 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL ALBANY 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 GUSTY WINDS UP TO 50 MPH AND HEAVY RAIN ARE STILL POSSIBLE 
WITH THIS THUNDERSTORM.

LAT...LON 4158 10605 4158 10575 4131 10583 4131 10601
TIME...MOT...LOC 0312Z 182DEG 14KT 4142 10592

$$

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, 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, 3:11 PM MDT	Severe Thunderstorm Warning	CYS	Converse	39 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.