Alert archive / Wyoming / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 116, NWS Cheyenne, WY

July 17, 2008Converse County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 17, 2008, 8:49 PM MDT for Converse County, Wyoming. It was in force for 26 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: Jul 17, 2008, 8:49 PM MDT (02:49 UTC)
Expired: Jul 17, 2008, 9:15 PM MDT
In force: 26 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon

County Converse County, WY

The radar

The Cheyenne radar (KCYS), 210 km from the middle of the area, began a volume at 02:49 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

Riverton, WY (KRIW), launched 00:00Z, 2.8 hours before the alert went out and 235 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: 17 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 3475 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 140 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 Jul 17, 6:27 PM MDT, 2 hours 22 minutes earlier.

Area forecast discussion, Jul 17, 6:27 PM MDT, 2 hours 22 minutes before

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Hazardous weather outlook, Jul 17, 11:05 AM MDT, 9 hours 44 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE CHEYENNE WY
1105 AM MDT THU JUL 17 2008

NEZ001>003-019>021-054-055-WYZ059>070-181715-
SIOUX-DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-
CHEYENNE-CONVERSE-NIOBRARA-SOUTHWEST CARBON-NORTH CARBON-
SNOWY RANGE-NORTH LARAMIE RANGE-LARAMIE VALLEY-LARAMIE RANGE-
PLATTE-GOSHEN-CHEYENNE FOOTHILLS-PINE BLUFFS-
1105 AM MDT THU JUL 17 2008

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

SHOWER AND THUNDERSTORM CHANCES ARE STILL EXPECTED TO INCREASE
ACROSS SOUTHEAST WYOMING AND THE NEBRASKA PANHANDLE THIS AFTERNOON
AND THIS EVENING. THUNDERSTORMS WILL BE MOST NUMEROUS IN AREAS
ALONG AND EAST OF THE LARAMIE RANGE. A FEW OF THE STORMS MAY
BECOME SEVERE CONTAINING HAIL...DAMAGING WINDS...AND HEAVY RAIN
ACROSS THE SOUTHERN NEBRASKA PANHANDLE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

LATE DAY THUNDERSTORM CHANCES WILL EXIST EVERYWHERE ON
FRIDAY...BUT ONLY FOR THE NEBRASKA PANHANDLE ON SATURDAY.
THUNDERSTORMS EAST OF THE LARAMIE RANGE COULD BECOME SEVERE ON
FRIDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT...BUT ARE
ENCOURAGED TO REPORT ANY SEVERE WEATHER CONDITIONS OBSERVED THIS
AFTERNOON AND EVENING.

&&

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

In the hours before

Local storm report, Jul 17, 5:24 PM MDT, 3 hours 25 minutes before

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Special weather statement, Jul 17, 6:35 PM MDT, 2 hours 14 minutes before

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Special weather statement, Jul 17, 8:43 PM MDT, 6 minutes before

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Nearby

Severe Thunderstorm Warnings in Wyoming, 2008 Every severe thunderstorm warning in 2008

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.