Alert archive / Wyoming / Special Weather Statements in 2017

Special Weather Statement, NWS Cheyenne, WY

June 27, 2017Laramie County, Wyoming

NWS Cheyenne, WY issued this special weather statement at Jun 27, 2017, 1:13 PM MDT for Laramie County, Wyoming. It was in force for 47 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
Jun 27, 2017, 1:13 PM MDT (19:13 UTC)
Expired
Jun 27, 2017, 2:00 PM MDT
In force
47 min
Issued by
NWS Cheyenne, WY

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 56 km from the middle of the area, began a volume at 19:16 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 12:00Z, 7.2 hours before the alert went out and 193 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 12:00Z on 2017-06-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 34 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 12:00Z on 2017-06-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 73 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
34 J/kg
Mixed-layer CIN
-526 J/kg
Mixed-layer LCL
2742 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
73 m²/s²
0-3 km storm-relative helicity
95 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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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 Jun 27, 1:02 PM MDT, 11 minutes earlier.

Area forecast discussion, Jun 27, 1:02 PM MDT, 11 minutes before
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Hazardous weather outlook, Jun 27, 3:35 AM MDT, 9 hours 38 minutes before
Hazardous Weather Outlook
National Weather Service Cheyenne WY
335 AM MDT Tue Jun 27 2017

WYZ101>119-280945-
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-
335 AM MDT Tue Jun 27 2017

This hazardous weather outlook is for portions of east central
Wyoming...south central Wyoming and southeast Wyoming.

.DAY ONE...TODAY AND TONIGHT

Widely scattered to scattered thunderstorms will develop this
afternoon with the greatest coverage over Converse and Niobrara
Counties. Gusty winds are possible with these storms but
widespread severe weather is not expected. Windy conditions will
also develop west of Interstate 25 this afternoon. Gusts of 40 to
50 mph are possible in these areas.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

The probability for widespread hazardous weather is low.

.Spotter information statement...

Spotter activation will not be needed.

NEZ002-003-019>021-054-055-095-096-280945-
Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne-
North Sioux-South Sioux-
335 AM MDT Tue Jun 27 2017

This hazardous weather outlook is for portions of western
Nebraska.

.DAY ONE...TODAY AND TONIGHT

Widely scattered to scattered showers and thunderstorms will
develop this afternoon. A few of these storms will be strong with
small hail and gusty winds but widespread severe weather is not
expected at this time.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

The probability for widespread hazardous weather is low.

.Spotter information statement...

Spotter activation will not be needed.

In the hours before

Special weather statement, Jun 27, 1:13 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
Jun 27, 12:47 PM MDTRed Flag WarningCYS6 hr
Jun 27, 2:40 PM MDTSpecial Weather StatementCYSConverse50 min
Jun 27, 3:14 PM MDTSpecial Weather StatementCYSNiobrara46 min
Jun 27, 3:35 PM MDTSpecial Weather StatementCYSNiobrara40 min
Jun 27, 3:57 PM MDTSpecial Weather StatementCYSNiobrara48 min
Jun 27, 4:54 PM MDTSpecial Weather StatementCYSConverse51 min
Jun 27, 5:24 PM MDTSpecial Weather StatementCYSAlbany51 min
Jun 27, 5:40 PM MDTSevere Thunderstorm WarningCYSAlbany, Laramie, Platte42 min
Jun 27, 1:55 PM MDTSpecial Weather StatementCYSBanner50 min
Jun 27, 1:58 PM MDTSpecial Weather StatementCYSScotts Bluff47 min
Jun 27, 3:10 PM MDTSpecial Weather StatementCYSKimball50 min
Jun 27, 3:20 PM MDTSpecial Weather StatementCYSKimball40 min
Jun 27, 3:23 PM MDTSpecial Weather StatementCYSBox Butte52 min
Jun 27, 3:24 PM MDTSpecial Weather StatementCYSSioux51 min
Jun 27, 3:40 PM MDTSpecial Weather StatementCYSDawes50 min
Jun 27, 4:05 PM MDTSpecial Weather StatementCYSCheyenne40 min
Jun 27, 4:08 PM MDTSpecial Weather StatementCYSDawes52 min
Jun 27, 4:19 PM MDTSpecial Weather StatementCYSDawes41 min
Jun 27, 4:33 PM MDTSpecial Weather StatementCYSMorrill27 min
Jun 27, 4:46 PM MDTSpecial Weather StatementCYSDawes44 min
Jun 27, 4:51 PM MDTSpecial Weather StatementCYSCheyenne39 min
Jun 27, 4:59 PM MDTSevere Thunderstorm WarningCYSCheyenne16 min

Nearby

Special Weather Statements in Wyoming, 2017Every special weather statement in 2017

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.