Alert archive / Wyoming / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 7, NWS Cheyenne, WY

May 5, 2012Goshen County, Laramie County, Wyoming; Banner County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at May 5, 2012, 3:49 PM MDT for Goshen County, Laramie County, Wyoming; Banner County, Nebraska. It was in force for 41 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: May 5, 2012, 3:49 PM MDT (21:49 UTC)
Expired: May 5, 2012, 4:30 PM MDT
In force: 41 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.75 in
Wind: 50.0 mph

Counties Banner County, NE, Goshen County, WY, Laramie County, WY

The radar

The Cheyenne radar (KCYS), 77 km from the middle of the area, began a volume at 21:53 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

Denver, CO (KDNR), launched 12:00Z, 9.8 hours before the alert went out and 204 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: 2826 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: -33 m²/s²
0-3 km storm-relative helicity: 33 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.

066 
WUUS55 KCYS 052149
SVRCYS
NEC007-WYC015-021-052230-
/O.NEW.KCYS.SV.W.0007.120505T2149Z-120505T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
349 PM MDT SAT MAY 5 2012

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN BANNER COUNTY IN THE PANHANDLE OF NEBRASKA...
  SOUTHEASTERN GOSHEN COUNTY IN SOUTHEAST WYOMING...
  NORTHEASTERN LARAMIE COUNTY IN SOUTHEAST WYOMING...

* UNTIL 430 PM MDT

* AT 348 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL.  THIS
  STORM WAS LOCATED 7 MILES EAST OF MERIDEN REST AREA...OR 34 MILES
  NORTHWEST OF KIMBALL...AND MOVING NORTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LA GRANGE AROUND 410 PM MDT.

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.

INTENSE SQUALL LINES CAN OCCASIONALLY PRODUCE BRIEF TORNADOES IN
ADDITION TO WIDESPREAD SIGNIFICANT WIND DAMAGE. ALTHOUGH NOT
IMMEDIATELY LIKELY...FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON
THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. THIS STORM HAS THE
POTENTIAL TO CAUSE SERIOUS INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

&&

LAT...LON 4145 10426 4153 10431 4173 10410 4172 10405
      4170 10405 4170 10397 4166 10384 4152 10388
      4142 10417
TIME...MOT...LOC 2149Z 218DEG 18KT 4151 10419
WIND...HAIL <50MPH 1.75IN

$$

LIEBL

1 follow-up statement

124 
WWUS55 KCYS 052206
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
406 PM MDT SAT MAY 5 2012

NEC007-WYC015-021-052230-
/O.CON.KCYS.SV.W.0007.000000T0000Z-120505T2230Z/
BANNER NE-GOSHEN WY-LARAMIE WY-
406 PM MDT SAT MAY 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
LARAMIE...SOUTHEASTERN GOSHEN AND NORTHWESTERN BANNER COUNTIES UNTIL
430 PM MDT...

AT 402 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL.  THIS
STORM WAS LOCATED 6 MILES NORTH OF ALBIN...OR 28 MILES NORTHWEST OF
KIMBALL...MOVING NORTHEAST AT 30 MPH.

THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF
NORTHEASTERN LARAMIE...NORTHWESTERN BANNER AND SOUTHEASTERN GOSHEN
COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

THIS IS A SUPERCELL THUNDERSTORM. DUE TO THE ROTATING NATURE OF
SUPERCELLS...THEY ARE CAPABLE OF PRODUCING ALL TYPES OF SEVERE
WEATHER...INCLUDING EXTREMELY LARGE HAIL...DESTRUCTIVE STRAIGHT LINE
WINDS AND POSSIBLY TORNADOES. BE PREPARED TO ACT QUICKLY SHOULD A
TORNADO OCCUR OR A TORNADO WARNING BE ISSUED.

&&

LAT...LON 4145 10426 4153 10431 4173 10410 4172 10405
      4170 10405 4170 10397 4166 10384 4152 10388
      4142 10417
TIME...MOT...LOC 2206Z 238DEG 25KT 4151 10403
WIND...HAIL <50MPH 1.75IN

$$

LIEBL

The office that day

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

Issued	Product	Office	Counties	Lasted
May 5, 1:34 PM MDT	Special Weather Statement	CYS	Converse	26 min
May 5, 1:56 PM MDT	Special Weather Statement	CYS	Converse	49 min
May 5, 2:10 PM MDT	Special Weather Statement	CYS	Laramie	50 min
May 5, 2:54 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	39 min
May 5, 3:23 PM MDT	Special Weather Statement	CYS	Niobrara	37 min
May 5, 3:58 PM MDT	Special Weather Statement	CYS	Goshen	62 min
May 5, 4:49 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	41 min
May 5, 5:13 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	47 min
May 5, 5:49 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	41 min
May 5, 2:48 PM MDT	Special Weather Statement	CYS	Banner	42 min
May 5, 4:21 PM MDT	Severe Thunderstorm Warning	CYS	Kimball	39 min
May 5, 4:27 PM MDT	Severe Thunderstorm Warning	CYS	Banner	33 min
May 5, 5:02 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball	43 min
May 5, 5:23 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Kimball	55 min
May 5, 5:37 PM MDT	Tornado Warning	CYS	Kimball	38 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2012 Severe Thunderstorm Warnings in Nebraska, 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.