Alert archive / Wyoming / Special Weather Statements in 2013

Special Weather Statement, NWS Cheyenne, WY

August 7, 2013Niobrara County, Wyoming

NWS Cheyenne, WY issued this special weather statement at Aug 7, 2013, 8:00 PM MDT for Niobrara County, Wyoming. It was in force for 30 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
Aug 7, 2013, 8:00 PM MDT (02:00 UTC)
Expired
Aug 7, 2013, 8:30 PM MDT
In force
30 min
Issued by
NWS Cheyenne, WY

County Niobrara County, WY

The radar

The Rapid City radar (KUDX), 137 km from the middle of the area, began a volume at 02:02 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 (KRAP), launched 00:00Z, 2.0 hours before the alert went out and 130 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, Rapid City, SD at 00:00Z on 2013-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 51 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 00:00Z on 2013-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -2 square meters per square second.19395878Sfc1 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
51 J/kg
Mixed-layer CIN
-115 J/kg
Mixed-layer LCL
2150 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
-2 m²/s²
0-3 km storm-relative helicity
278 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 Aug 7, 6:11 PM MDT, 1 hour 49 minutes earlier.

Area forecast discussion, Aug 7, 6:11 PM MDT, 1 hour 49 minutes before
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Hazardous weather outlook, Aug 7, 7:56 PM MDT, 4 minutes before
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In the hours before

Special weather statement, Aug 7, 3:15 PM MDT, 4 hours 45 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
315 PM MDT WED AUG 7 2013

WYZ103-106-116-072215-
CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY WY-NORTH LARAMIE
RANGE WY-SOUTH LARAMIE RANGE WY-
315 PM MDT WED AUG 7 2013

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN PLATTE AND EASTERN
ALBANY COUNTIES UNTIL 415 PM MDT...

AT 310 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 16 MILES SOUTHEAST OF GARRETT...OR 19 MILES WEST
OF WHEATLAND...MOVING SOUTH AT 10 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
MAINLY RURAL AREAS OF EASTERN ALBANY AND SOUTHWESTERN PLATTE
COUNTIES.

THIS INCLUDES HIGHWAY 34 BETWEEN MILEPOSTS 25 AND 38.

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 4173 10504 4166 10539 4201 10539 4207 10527
TIME...MOT...LOC 2114Z 345DEG 11KT 4199 10533

HAHN
Local storm report, Aug 7, 4:41 PM MDT, 3 hours 19 minutes before
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Special weather statement, Aug 7, 4:42 PM MDT, 3 hours 18 minutes before
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Special weather statement, Aug 7, 4:59 PM MDT, 3 hours 1 minute before
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Special weather statement, Aug 7, 8:00 PM MDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 8, 3:01 AM MDTDense Fog AdvisoryCYSAlbany, Laramie4 hr
Aug 8, 3:28 PM MDTSpecial Weather StatementCYSAlbany47 min
Aug 8, 3:44 PM MDTSpecial Weather StatementCYSAlbany61 min
Aug 8, 4:46 PM MDTSpecial Weather StatementCYSAlbany59 min
Aug 7, 9:39 PM MDTSpecial Weather StatementCYSDawes21 min
Aug 7, 10:10 PM MDTSpecial Weather StatementCYSDawes20 min
Aug 8, 3:05 PM MDTSpecial Weather StatementCYSSioux40 min

Nearby

Special Weather Statements in Wyoming, 2013Every special weather statement in 2013

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.