Alert archive / Wyoming / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 45, NWS Cheyenne, WY

June 7, 2012Laramie County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 7, 2012, 7:03 PM MDT for Laramie County, Wyoming. It was in force for 31 min. 5 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
Jun 7, 2012, 7:03 PM MDT (01:03 UTC)
Expired
Jun 7, 2012, 7:34 PM MDT
In force
31 min
Issued by
NWS Cheyenne, WY
Area
Storm-based polygon
Hail
2.0 in
Wind
60.0 mph

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 37 km from the middle of the area, began a volume at 01:04 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

TimeReportWhereRemark
Jun 7, 7:10 PM MDTHAIL 13 N Burns, WY
Jun 7, 7:15 PM MDTHAIL 1.53 N Burns, WY
Jun 7, 7:28 PM MDTHAIL 1.753 Sw Burns, WY
Jun 7, 7:29 PM MDTHAIL 2Burns, WYMAINLY PING-PONG TO GOLF BALL SIZED HAIL WITH A FEW HEN EGG. BROKE WINDOWS AND TORE UP SIDING.
Jun 7, 7:33 PM MDTHAIL 1.255 Sw Burns, WY

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

The watch it was issued in

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

IssuedProductOfficeLasted
Jun 7, 11:46 AM MDTTornado WatchSPC10 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 1.1 hours before the alert went out and 183 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-pSkew-T log-p diagram, Denver, CO at 00:00Z on 2012-06-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1009 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2012-06-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 28 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1009 J/kg
Mixed-layer CIN
-107 J/kg
Mixed-layer LCL
2384 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
28 m²/s²
0-3 km storm-relative helicity
80 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

074 
WUUS55 KCYS 080103
SVRCYS
WYC021-080145-
/O.NEW.KCYS.SV.W.0045.120608T0103Z-120608T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
703 PM MDT THU JUN 7 2012

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL LARAMIE COUNTY IN SOUTHEAST WYOMING...

* UNTIL 745 PM MDT

* AT 700 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE HAIL UP TO HEN
  EGG SIZE...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
  LOCATED NEAR HILLSDALE...OR 20 MILES EAST OF CHEYENNE...AND MOVING
  SOUTHEAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BURNS.

THIS INCLUDES INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 380 AND
390.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

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

&&

LAT...LON 4134 10435 4128 10419 4105 10434 4123 10457
      4133 10451
TIME...MOT...LOC 0102Z 314DEG 13KT 4124 10443
WIND...HAIL 60MPH 2.00IN

$$

HAMMER
2 follow-up statements
403 
WWUS55 KCYS 080119
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
719 PM MDT THU JUN 7 2012

WYC021-080145-
/O.CON.KCYS.SV.W.0045.000000T0000Z-120608T0145Z/
LARAMIE WY-
719 PM MDT THU JUN 7 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
LARAMIE COUNTY UNTIL 745 PM MDT...

AT 713 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE HAIL UP TO HEN
EGG SIZE...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR BURNS...OR 23 MILES EAST OF CHEYENNE...MOVING SOUTHEAST
AT 20 MPH.

IN ADDITION...AT 715 PM MDT...PING PONG SIZED HAIL WAS REPORTED 3 
MILES NORTH OF BURNS BY A TRAINED WEATHER SPOTTER.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EASTERN LARAMIE COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

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

&&

LAT...LON 4134 10435 4128 10419 4105 10434 4121 10454
TIME...MOT...LOC 0118Z 308DEG 17KT 4119 10434
WIND...HAIL 60MPH 2.00IN

$$

HAMMER
348 
WWUS55 KCYS 080134
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
734 PM MDT THU JUN 7 2012

WYC021-080145-
/O.CAN.KCYS.SV.W.0045.000000T0000Z-120608T0145Z/
LARAMIE WY-
734 PM MDT THU JUN 7 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL LARAMIE COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

LAT...LON 4134 10435 4128 10419 4105 10434 4121 10454
TIME...MOT...LOC 0135Z 308DEG 17KT 4114 10426

$$

HAMMER

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 7, 6:23 PM MDTSevere Thunderstorm WarningCYSLaramie41 min
Jun 7, 6:36 PM MDTSevere Thunderstorm WarningCYSLaramie20 min
Jun 7, 6:39 PM MDTSpecial Weather StatementCYSLaramie51 min
Jun 7, 6:49 PM MDTSevere Thunderstorm WarningCYSLaramie56 min
Jun 7, 7:32 PM MDTSevere Thunderstorm WarningCYSLaramie43 min
Jun 7, 8:06 PM MDTSpecial Weather StatementCYSLaramie39 min
Jun 7, 8:40 PM MDTSevere Thunderstorm WarningCYSLaramie34 min
Jun 7, 9:49 PM MDTSpecial Weather StatementCYSLaramie41 min
Jun 7, 10:36 PM MDTSpecial Weather StatementCYSLaramie39 min
Jun 8, 9:33 AM MDTFire Weather WatchCYS11 hr
Jun 8, 9:33 AM MDTFire Weather WatchCYS41 hr
Jun 8, 11:09 AM MDTRed Flag WarningCYS9 hr

Nearby

Severe Thunderstorm Warnings in Wyoming, 2012Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.