Alert archive / Wyoming / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 26, NWS Cheyenne, WY

June 9, 2006Niobrara County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 9, 2006, 6:39 PM MDT for Niobrara County, Wyoming. It was in force for 44 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 9, 2006, 6:39 PM MDT (00:39 UTC)
Expired: Jun 9, 2006, 7:23 PM MDT
In force: 44 min
Issued by: NWS Cheyenne, WY
Area: Counties, with a storm outline in the text

County Niobrara County, WY

The radar

The Rapid City radar (KUDX), 178 km from the middle of the area, began a volume at 00:40 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 9, 1:19 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.7 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: 169 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 3488 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -37 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 9, 3:45 PM MDT, 2 hours 54 minutes earlier.

Area forecast discussion, Jun 9, 3:45 PM MDT, 2 hours 54 minutes before

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Hazardous weather outlook, Jun 9, 10:10 AM MDT, 8 hours 29 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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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 10, 12:01 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	29 min
Jun 10, 2:05 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	25 min
Jun 10, 2:30 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	37 min
Jun 10, 1:12 PM MDT	Severe Thunderstorm Warning	CYS	Scotts Bluff, Sioux	48 min
Jun 10, 1:24 PM MDT	Tornado Warning	CYS	Box Butte, Morrill, Scotts Bluff, Sioux	51 min
Jun 10, 2:21 PM MDT	Severe Thunderstorm Warning	CYS	Morrill	39 min
Jun 10, 3:16 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne, Kimball	44 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2006 Every severe thunderstorm warning in 2006

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.