Alert archive / Nebraska / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 132, NWS Cheyenne, WY

June 30, 2015Laramie County, Wyoming; 4 counties in Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 30, 2015, 9:27 PM MDT for Laramie County, Wyoming; 4 counties in Nebraska. It was in force for 33 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 30, 2015, 9:27 PM MDT (03:27 UTC)
Expired: Jun 30, 2015, 10:00 PM MDT
In force: 33 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Banner County, NE, Cheyenne County, NE, Kimball County, NE, Morrill County, NE, Laramie County, WY

The radar

The Cheyenne radar (KCYS), 102 km from the middle of the area, began a volume at 03:29 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, 3.5 hours before the alert went out and 173 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: 37 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 3246 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 4 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 30, 5:42 PM MDT, 3 hours 45 minutes earlier.

Area forecast discussion, Jun 30, 5:42 PM MDT, 3 hours 45 minutes before

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Hazardous weather outlook, Jun 30, 3:36 AM MDT, 17 hours 51 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
336 AM MDT TUE JUN 30 2015

NEZ002-003-019>021-054-055-095-096-WYZ101>119-010945-
DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE-
NORTH SIOUX-SOUTH SIOUX-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-
336 AM MDT TUE JUN 30 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WESTERN
NEBRASKA...EAST CENTRAL WYOMING...SOUTH CENTRAL WYOMING AND
SOUTHEAST WYOMING.

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS WILL DEVELOP THIS AFTERNOON WITH THE PASSAGE
OF A COOL FRONT AND UPPER LEVEL DISTURBANCE. THUNDERSTORMS WILL
LINGER INTO THE LATE EVENING BEFORE ENDING. SOME OF THE THUNDERSTORMS
MAY BECOME STRONG WITH GUSTY WINDS AND SMALL HAIL. AN ISOLATED SEVERE
THUNDERSTORM OR TWO PRODUCING ONE INCH HAIL AND WIND GUSTS IN EXCESS
OF 58 MPH IS ALSO POSSIBLE OVER THE PLAINS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

ISOLATED TO SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE FORECAST
WEDNESDAY AND THURSDAY. A FEW STRONG THUNDERSTORMS WILL BE POSSIBLE
ACROSS THE PLAINS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE REQUIRED TODAY AND TONIGHT.

In the hours before

Special weather statement, Jun 30, 6:20 PM MDT, 3 hours 7 minutes before

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Special weather statement, Jun 30, 6:48 PM MDT, 2 hours 39 minutes before

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Special weather statement, Jun 30, 8:07 PM MDT, 1 hour 20 minutes before

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Special weather statement, Jun 30, 8:13 PM MDT, 1 hour 14 minutes before

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Special weather statement, Jun 30, 8:40 PM MDT, 47 minutes before

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Special weather statement, Jun 30, 8:54 PM MDT, 33 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 6:20 PM MDT	Special Weather Statement	CYS	Laramie	25 min
Jun 30, 6:48 PM MDT	Special Weather Statement	CYS	Albany	27 min
Jun 30, 8:07 PM MDT	Special Weather Statement	CYS	Platte	23 min
Jun 30, 8:13 PM MDT	Special Weather Statement	CYS	Laramie	32 min
Jun 30, 8:40 PM MDT	Special Weather Statement	CYS	Laramie	35 min
Jun 30, 8:54 PM MDT	Special Weather Statement	CYS	Laramie	36 min
Jul 1, 3:18 PM MDT	Special Weather Statement	CYS	Laramie	27 min
Jul 1, 3:40 PM MDT	Special Weather Statement	CYS	Platte	35 min
Jul 1, 3:58 PM MDT	Special Weather Statement	CYS	Platte	32 min
Jul 1, 4:04 PM MDT	Special Weather Statement	CYS	Laramie	41 min
Jul 1, 4:49 PM MDT	Special Weather Statement	CYS	Laramie	41 min
Jul 1, 5:00 PM MDT	Special Weather Statement	CYS	Carbon	45 min
Jul 1, 5:02 PM MDT	Special Weather Statement	CYS	Platte	43 min
Jun 30, 10:59 PM MDT	Special Weather Statement	CYS	Cheyenne	46 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2015 Severe Thunderstorm Warnings in Wyoming, 2015 Every severe thunderstorm warning in 2015

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.