Alert archive / Wyoming / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 81, NWS Cheyenne, WY

June 18, 2013Albany County, Converse County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 18, 2013, 1:33 PM MDT for Albany County, Converse County, Wyoming. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 18, 2013, 1:33 PM MDT (19:33 UTC)
Expired: Jun 18, 2013, 2:15 PM MDT
In force: 42 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Albany County, WY, Converse County, WY

The radar

The Cheyenne radar (KCYS), 146 km from the middle of the area, began a volume at 19:33 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, 7.6 hours before the alert went out and 295 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: 24 J/kg
Mixed-layer CIN: -337 J/kg
Mixed-layer LCL: 1258 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jun 18, 10:34 AM MDT, 2 hours 59 minutes earlier.

Area forecast discussion, Jun 18, 10:34 AM MDT, 2 hours 59 minutes before

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Hazardous weather outlook, Jun 18, 11:30 AM MDT, 2 hours 3 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
1130 AM MDT TUE JUN 18 2013

WYZ104-105-109>116-191100-
FERRIS/SEMINOE/SHIRLEY MOUNTAINS-SHIRLEY BASIN-
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-
1130 AM MDT TUE JUN 18 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

ISOLATED AFTERNOON AND EARLY EVENING THUNDERSTORMS WILL DEVELOP
OVER THE MOUNTAINS. GUSTY WINDS TO 50 MPH AND SMALL HAIL WILL BE
POSSIBLE WITH THE STRONGER STORMS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

SOUTHWEST WINDS WILL GUST AS HIGH AS 40 MPH WEDNESDAY THROUGH
FRIDAY. THESE GUSTY WINDS WILL COMBINE WITH VERY LOW RELATIVE
HUMIDITIES AND WARM DAYTIME TEMPERATURES TO INCREASE THE FIRE
DANGER.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE REQUIRED TODAY AND 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-WYZ101>103-106>108-117>119-
191100-
DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE-
NORTH SIOUX-SOUTH SIOUX-CONVERSE COUNTY LOWER ELEVATIONS-
NIOBRARA COUNTY-NORTH LARAMIE RANGE-
CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY-
EAST PLATTE COUNTY-GOSHEN COUNTY-SOUTH LARAMIE RANGE FOOTHILLS-
CENTRAL LARAMIE COUNTY-EAST LARAMIE COUNTY-
1130 AM MDT TUE JUN 18 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA
PANHANDLE...EAST CENTRAL WYOMING AND SOUTHEAST WYOMING.

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS WILL DEVELOP EARLY THIS AFTERNOON ALONG THE
LARAMIE RANGE AND MOVE EAST ONTO THE PLAINS DURING THE AFTERNOON.
SOME OF THE STORMS EAST OF A LINE FROM DOUGLAS TO CHEYENNE WILL
BECOME SEVERE PRODUCING LARGE HAIL AND DAMAGING WINDS. THE
THUNDERSTORMS WILL MOVE INTO THE WESTERN NEBRASKA PANHANDLE THIS
EVENING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

ISOLATED LATE DAY THUNDERSTORMS WILL BE POSSIBLE FRIDAY THROUGH
SUNDAY. SEVERE WEATHER IS NOT EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED FROM LATE THIS AFTERNOON
THROUGH EARLY THIS EVENING.

&&

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

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 6:22 PM MDT	Severe Thunderstorm Warning	CYS	Converse	38 min
Jun 17, 6:36 PM MDT	Special Weather Statement	CYS	Niobrara	54 min
Jun 17, 6:58 PM MDT	Special Weather Statement	CYS	Niobrara	32 min
Jun 17, 8:34 PM MDT	Special Weather Statement	CYS	Goshen	56 min
Jun 17, 8:56 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	64 min
Jun 18, 3:21 PM MDT	Special Weather Statement	CYS	Converse	39 min
Jun 18, 4:12 PM MDT	Special Weather Statement	CYS	Platte	48 min
Jun 18, 4:16 PM MDT	Special Weather Statement	CYS	Platte	44 min
Jun 18, 4:46 PM MDT	Special Weather Statement	CYS	Goshen	29 min
Jun 18, 5:00 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	60 min
Jun 18, 5:02 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	58 min
Jun 18, 5:51 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	54 min
Jun 17, 6:05 PM MDT	Special Weather Statement	CYS	Sioux	40 min
Jun 17, 6:50 PM MDT	Special Weather Statement	CYS	Sioux	40 min
Jun 17, 7:35 PM MDT	Special Weather Statement	CYS	Box Butte	55 min
Jun 17, 7:37 PM MDT	Special Weather Statement	CYS	Sioux	53 min
Jun 17, 7:53 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill, Scotts Bluff, Sioux	52 min
Jun 17, 8:07 PM MDT	Severe Thunderstorm Warning	CYS	Sioux	53 min
Jun 17, 8:12 PM MDT	Special Weather Statement	CYS	Dawes	48 min
Jun 17, 8:43 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Morrill, Scotts Bluff	62 min
Jun 17, 9:05 PM MDT	Special Weather Statement	CYS	Box Butte	55 min
Jun 17, 9:39 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Morrill, Scotts Bluff	66 min
Jun 17, 9:46 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Box Butte, Morrill, Scotts Bluff, Sioux	44 min
Jun 17, 10:34 PM MDT	Areal Flood Advisory	CYS	Banner, Morrill, Scotts Bluff	3 hr
Jun 17, 10:43 PM MDT	Special Weather Statement	CYS	Cheyenne, Morrill	47 min
Jun 17, 10:46 PM MDT	Special Weather Statement	CYS	Cheyenne, Morrill	44 min
Jun 18, 4:57 PM MDT	Special Weather Statement	CYS	Kimball	33 min
Jun 18, 5:18 PM MDT	Special Weather Statement	CYS	Banner	42 min
Jun 18, 5:41 PM MDT	Special Weather Statement	CYS	Kimball	49 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2013 Every severe thunderstorm warning 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.