Alert archive / Wyoming / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 102, NWS Cheyenne, WY

June 25, 2008Niobrara County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 25, 2008, 5:57 PM MDT for Niobrara County, Wyoming. It was in force for 39 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 25, 2008, 5:57 PM MDT (23:57 UTC)
Expired: Jun 25, 2008, 6:36 PM MDT
In force: 39 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon

County Niobrara County, WY

The radar

The Rapid City radar (KUDX), 178 km from the middle of the area, began a volume at 23:58 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 (KDNR), launched 12:00Z, 12.0 hours before the alert went out and 369 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2821 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -30 m²/s²
0-3 km storm-relative helicity: 30 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 25, 2:50 PM MDT, 3 hours 7 minutes earlier.

Area forecast discussion, Jun 25, 2:50 PM MDT, 3 hours 7 minutes before

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Hazardous weather outlook, Jun 25, 10:49 AM MDT, 7 hours 8 minutes before

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In the hours before

Special weather statement, Jun 25, 3:36 PM MDT, 2 hours 21 minutes before

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Special weather statement, Jun 25, 4:12 PM MDT, 1 hour 45 minutes before

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Local storm report, Jun 25, 4:30 PM MDT, 1 hour 27 minutes before

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Special weather statement, Jun 25, 4:46 PM MDT, 1 hour 11 minutes before

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Special weather statement, Jun 25, 5:21 PM MDT, 36 minutes before

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Local storm report, Jun 25, 5:41 PM MDT, 16 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 24, 10:29 PM MDT	Severe Thunderstorm Warning	CYS	Morrill	31 min

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.