Alert archive / Wyoming / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 14, NWS Cheyenne, WY

May 7, 2008Goshen County, Wyoming; Scotts Bluff County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at May 7, 2008, 8:43 PM MDT for Goshen County, Wyoming; Scotts Bluff County, Nebraska. 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: May 7, 2008, 8:43 PM MDT (02:43 UTC)
Expired: May 7, 2008, 9:27 PM MDT
In force: 44 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon

Counties Scotts Bluff County, NE, Goshen County, WY

The radar

The Cheyenne radar (KCYS), 111 km from the middle of the area, began a volume at 02:46 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
Jan 7, 12:52 PM MST	Tornado Watch	SPC	146 days

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 2.7 hours before the alert went out and 243 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: 373 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1767 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 3 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 May 7, 6:52 PM MDT, 1 hour 51 minutes earlier.

Area forecast discussion, May 7, 6:52 PM MDT, 1 hour 51 minutes before

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Hazardous weather outlook, May 7, 7:50 PM MDT, 53 minutes before

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In the hours before

Local storm report, May 7, 7:30 PM MDT, 1 hour 13 minutes before

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Local storm report, May 7, 7:42 PM MDT, 1 hour 1 minute before

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Local storm report, May 7, 7:45 PM MDT, 58 minutes before

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Local storm report, May 7, 7:48 PM MDT, 55 minutes before

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Local storm report, May 7, 8:07 PM MDT, 36 minutes before

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Special weather statement, May 7, 8:17 PM MDT, 26 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
May 7, 6:39 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	36 min
May 7, 7:17 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	43 min
May 7, 7:55 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	50 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2008 Severe Thunderstorm Warnings in Nebraska, 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.