Alert archive / Wyoming / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 141, NWS Cheyenne, WY

July 8, 2013Goshen County, Niobrara County, Platte County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 8, 2013, 5:08 PM MDT for Goshen County, Niobrara County, Platte County, Wyoming. It was in force for 37 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 8, 2013, 5:08 PM MDT (23:08 UTC)
Expired: Jul 8, 2013, 5:45 PM MDT
In force: 37 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Goshen County, WY, Niobrara County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 143 km from the middle of the area, began a volume at 23:11 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, 11.1 hours before the alert went out and 306 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: 2345 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 157 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 8, 2:55 PM MDT, 2 hours 13 minutes earlier.

Area forecast discussion, Jul 8, 2:55 PM MDT, 2 hours 13 minutes before

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Hazardous weather outlook, Jul 8, 11:50 AM MDT, 5 hours 18 minutes before

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In the hours before

Special weather statement, Jul 8, 3:51 PM MDT, 1 hour 17 minutes before

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Special weather statement, Jul 8, 4:06 PM MDT, 1 hour 2 minutes before

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Special weather statement, Jul 8, 4:37 PM MDT, 31 minutes before

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Special weather statement, Jul 8, 4:39 PM MDT, 29 minutes before

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Special weather statement, Jul 8, 4:57 PM MDT, 11 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
Jul 8, 3:51 PM MDT	Special Weather Statement	CYS	Laramie	39 min
Jul 8, 4:06 PM MDT	Special Weather Statement	CYS	Goshen	39 min
Jul 8, 4:37 PM MDT	Special Weather Statement	CYS	Platte	38 min
Jul 8, 4:39 PM MDT	Special Weather Statement	CYS	Goshen	51 min
Jul 8, 4:57 PM MDT	Special Weather Statement	CYS	Platte	63 min
Jul 8, 5:13 PM MDT	Special Weather Statement	CYS	Scotts Bluff	47 min
Jul 8, 5:15 PM MDT	Special Weather Statement	CYS	Sioux	45 min
Jul 8, 5:25 PM MDT	Special Weather Statement	CYS	Cheyenne	35 min
Jul 8, 5:47 PM MDT	Areal Flood Advisory	CYS	Cheyenne	4 hr
Jul 8, 5:51 PM MDT	Special Weather Statement	CYS	Sioux	39 min
Jul 8, 5:55 PM MDT	Special Weather Statement	CYS	Sioux	50 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2013 Every severe thunderstorm warning in 2013

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.