Alert archive / Wyoming / Special Weather Statements in 2012

Special Weather Statement, NWS Cheyenne, WY

July 27, 2012Platte County, Wyoming

NWS Cheyenne, WY issued this special weather statement at Jul 27, 2012, 3:44 PM MDT for Platte County, Wyoming. It was in force for 46 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 27, 2012, 3:44 PM MDT (21:44 UTC)
Expired: Jul 27, 2012, 4:30 PM MDT
In force: 46 min
Issued by: NWS Cheyenne, WY

County Platte County, WY

The radar

The Cheyenne radar (KCYS), 79 km from the middle of the area, began a volume at 21:44 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

Rapid City, SD (KUNR), launched 12:00Z, 9.7 hours before the alert went out and 299 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: 1749 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 214 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.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Cheyenne, WY wrote its last area forecast discussion before this special weather statement went out at Jul 27, 11:42 AM MDT, 4 hours 2 minutes earlier.

Area forecast discussion, Jul 27, 11:42 AM MDT, 4 hours 2 minutes before

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Hazardous weather outlook, Jul 27, 11:30 AM MDT, 4 hours 14 minutes before

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In the hours before

Special weather statement, Jul 27, 2:14 PM MDT, 1 hour 30 minutes before

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Special weather statement, Jul 27, 2:22 PM MDT, 1 hour 22 minutes before

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Special weather statement, Jul 27, 2:52 PM MDT, 52 minutes before

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Special weather statement, Jul 27, 3:12 PM MDT, 32 minutes before

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Special weather statement, Jul 27, 3:26 PM MDT, 18 minutes before

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Special weather statement, Jul 27, 3:44 PM MDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
344 PM MDT FRI JUL 27 2012

WYZ106-107-116>118-272230-
CENTRAL LARAMIE COUNTY WY-CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE
COUNTY WY-EAST PLATTE COUNTY WY-SOUTH LARAMIE RANGE WY-SOUTH LARAMIE
RANGE FOOTHILLS WY-
344 PM MDT FRI JUL 27 2012

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN PLATTE...NORTHWESTERN
LARAMIE AND EASTERN ALBANY COUNTIES UNTIL 430 PM MDT...

AT 340 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 5 MILES SOUTH OF
BORDEAUX TO IRON MOUNTAIN...AND MOVING EAST AT 15 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THESE STORMS...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.

LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...
  CHUGWATER...

THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 53 AND
78.

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

&&

LAT...LON 4200 10468 4156 10492 4163 10539 4206 10512
TIME...MOT...LOC 2144Z 269DEG 12KT 4187 10493 4157 10524

MSW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 2:14 PM MDT	Special Weather Statement	CYS	Albany	46 min
Jul 27, 2:22 PM MDT	Special Weather Statement	CYS		38 min
Jul 27, 2:52 PM MDT	Special Weather Statement	CYS	Albany	38 min
Jul 27, 3:12 PM MDT	Special Weather Statement	CYS	Albany	33 min
Jul 27, 5:34 PM MDT	Special Weather Statement	CYS	Cheyenne	41 min

Nearby

Special Weather Statements in Wyoming, 2012 Every special weather statement 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.