Alert archive / Wyoming / Special Weather Statements in 2013

Special Weather Statement, NWS Cheyenne, WY

October 13, 2013Laramie County, Wyoming

NWS Cheyenne, WY issued this special weather statement at Oct 13, 2013, 7:34 PM MDT for Laramie County, Wyoming. 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
Oct 13, 2013, 7:34 PM MDT (01:34 UTC)
Expired
Oct 13, 2013, 8:15 PM MDT
In force
41 min
Issued by
NWS Cheyenne, WY

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 41 km from the middle of the area, began a volume at 01:36 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 (KDEN), launched 00:00Z, 1.6 hours before the alert went out and 207 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 2013-10-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 67 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 2013-10-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 249 square meters per square second.1939587897Sfc1 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
67 J/kg
Mixed-layer CIN
-195 J/kg
Mixed-layer LCL
1686 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
249 m²/s²
0-3 km storm-relative helicity
276 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 Oct 13, 7:23 PM MDT, 11 minutes earlier.

Area forecast discussion, Oct 13, 7:23 PM MDT, 11 minutes before
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Hazardous weather outlook, Oct 13, 6:15 PM MDT, 1 hour 19 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE CHEYENNE WY
615 PM MDT SUN OCT 13 2013

WYZ101>119-141100-
CONVERSE COUNTY LOWER ELEVATIONS-NIOBRARA COUNTY-
NORTH LARAMIE RANGE-FERRIS/SEMINOE/SHIRLEY MOUNTAINS-
SHIRLEY BASIN-CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY-
EAST PLATTE COUNTY-GOSHEN COUNTY-CENTRAL CARBON COUNTY-
NORTH SNOWY RANGE FOOTHILLS-SOUTHWEST CARBON COUNTY-
SIERRA MADRE RANGE-UPPER NORTH PLATTE RIVER BASIN-SNOWY RANGE-
LARAMIE VALLEY-SOUTH LARAMIE RANGE-SOUTH LARAMIE RANGE FOOTHILLS-
CENTRAL LARAMIE COUNTY-EAST LARAMIE COUNTY-
615 PM MDT SUN OCT 13 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST WYOMING.

.DAY ONE...TONIGHT

ANOTHER PACIFIC STORM SYSTEM WILL BEGIN TO IMPACT SOUTHEAST WYOMING
WITH RAIN SHOWERS ACROSS SOUTHEAST WYOMING BECOMING WIDESPREAD BY
MIDNIGHT. ISOLATED THUNDERSTORMS WILL ALSO BE POSSIBLE THROUGH EARLY
TONIGHT. THE RAIN WILL EVENTUALLY MIX WITH AND CHANGE OVER TO SNOW
ABOVE 7500 FEET LATE TONIGHT. A WINTER WEATHER ADVISORY IS IN EFFECT
FOR THE SIERRA MADRE...SNOWY AND NORTHERN LARAMIE RANGES STARTING
LATE TONIGHT.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

RAIN AND SNOW WILL CONTINUE MONDAY MORNING...WITH MAINLY SNOW ABOVE
6000 FEET. FIVE TO TEN INCHES OF TOTAL NEW SNOW WILL BE POSSIBLE
THROUGH MONDAY OVER THE SNOWY AND SIERRA MADRE RANGES. THE LARAMIE
RANGE WILL RECEIVE 3 TO 8 INCHES OF SNOW AND THE LOWER ELEVATIONS OF
EAST CENTRAL AND SOUTH CENTRAL WYOMING CAN EXPECT 1 TO 2 INCHES BY
LATE MONDAY AFTERNOON. THE SNOW WILL END EARLY MONDAY NIGHT. THE
WINTER WEATHER ADVISORY IS IN EFFECT THROUGH 6 PM MONDAY FOR THE
SNOWY AND SIERRA MADRE RANGES AND UNTIL MIDNIGHT MONDAY NIGHT FOR THE
NORTHERN LARAMIE RANGE. WINDS WILL INCREASE FROM THE NORTHWEST ON
MONDAY...WITH GUSTS UP TO 55 MPH EXPECTED EAST OF THE LARAMIE RANGE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TONIGHT.

&&

THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND
CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT...
HTTP://WEATHER.GOV/CHEYENNE

NEZ002-003-019>021-054-055-095-096-141100-
DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE-
NORTH SIOUX-SOUTH SIOUX-
615 PM MDT SUN OCT 13 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA
PANHANDLE.

.DAY ONE...TONIGHT

THERE IS A CHANCE OF THUNDERSTORMS THIS EVENING ACROSS WESTERN
NEBRASKA. THESE THUNDERSTORMS MAY CONTINUE THROUGH THE NIGHT WITH
PERIODS OF MODERATE TO HEAVY RAIN AND OCCASIONAL LIGHTNING THE
PRIMARY THREATS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

WINDS WILL INCREASE FROM THE NORTHWEST BEHIND THE COLD FRONT ON
MONDAY...WITH GUSTS UP TO 55 MPH EXPECTED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TONIGHT.

&&

THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND
CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT...
HTTP://WEATHER.GOV/CHEYENNE

WEILAND

In the hours before

Local storm report, Oct 13, 7:34 PM MDT, 0 minutes before
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Special weather statement, Oct 13, 7:34 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
Oct 13, 8:08 PM MDTSpecial Weather StatementCYSLaramie37 min
Oct 13, 8:42 PM MDTSpecial Weather StatementCYSScotts Bluff48 min
Oct 14, 1:53 AM MDTWind AdvisoryCYSBanner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more25 hr

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.