Alert archive / Nebraska / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 203, NWS Cheyenne, WY

July 31, 2013Box Butte County, Dawes County, Sioux County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 31, 2013, 6:56 PM MDT for Box Butte County, Dawes County, Sioux County, Nebraska. It was in force for 49 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 31, 2013, 6:56 PM MDT (00:56 UTC)
Expired: Jul 31, 2013, 7:45 PM MDT
In force: 49 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Box Butte County, NE, Dawes County, NE, Sioux County, NE

The radar

The Rapid City radar (KUDX), 188 km from the middle of the area, began a volume at 00:57 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.9 hours before the alert went out and 271 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: 1537 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 1192 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.3

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 31, 6:25 PM MDT, 31 minutes earlier.

Area forecast discussion, Jul 31, 6:25 PM MDT, 31 minutes before

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Hazardous weather outlook, Jul 31, 6:10 PM MDT, 46 minutes before

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In the hours before

Special weather statement, Jul 31, 6:07 PM MDT, 49 minutes before

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Special weather statement, Jul 31, 6:23 PM MDT, 33 minutes before

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Local storm report, Jul 31, 6:27 PM MDT, 29 minutes before

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Special weather statement, Jul 31, 6:42 PM MDT, 14 minutes before

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Special weather statement, Jul 31, 6:47 PM MDT, 9 minutes before

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Local storm report, Jul 31, 6:54 PM MDT, 2 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 31, 6:07 PM MDT	Special Weather Statement	CYS	Niobrara	23 min
Jul 31, 6:29 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	46 min
Jul 31, 7:08 PM MDT	Special Weather Statement	CYS	Niobrara	52 min
Aug 1, 2:44 PM MDT	Special Weather Statement	CYS	Laramie	61 min
Aug 1, 3:16 PM MDT	Special Weather Statement	CYS	Laramie	59 min
Aug 1, 3:23 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	52 min
Aug 1, 4:36 PM MDT	Special Weather Statement	CYS	Niobrara	54 min
Aug 1, 5:38 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara	52 min
Aug 1, 5:51 PM MDT	Special Weather Statement	CYS	Platte	54 min
Jul 31, 6:05 PM MDT	Special Weather Statement	CYS	Box Butte	55 min
Jul 31, 6:23 PM MDT	Special Weather Statement	CYS	Sioux	67 min
Jul 31, 6:42 PM MDT	Special Weather Statement	CYS	Sioux	63 min
Jul 31, 6:47 PM MDT	Special Weather Statement	CYS	Box Butte	58 min
Jul 31, 9:52 PM MDT	Special Weather Statement	CYS	Morrill	23 min
Jul 31, 10:05 PM MDT	Special Weather Statement	CYS	Morrill	55 min
Jul 31, 10:40 PM MDT	Severe Thunderstorm Warning	CYS	Morrill	50 min
Aug 1, 7:50 AM MDT	Special Weather Statement	CYS	Cheyenne	25 min
Aug 1, 4:03 PM MDT	Special Weather Statement	CYS	Dawes	42 min
Aug 1, 4:33 PM MDT	Special Weather Statement	CYS	Kimball	57 min
Aug 1, 4:44 PM MDT	Special Weather Statement	CYS	Dawes	46 min
Aug 1, 4:54 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes	51 min
Aug 1, 4:59 PM MDT	Special Weather Statement	CYS	Banner	61 min
Aug 1, 5:09 PM MDT	Areal Flood Advisory	CYS	Dawes	3 hr
Aug 1, 5:10 PM MDT	Special Weather Statement	CYS	Kimball	65 min
Aug 1, 5:17 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Kimball	58 min
Aug 1, 5:31 PM MDT	Special Weather Statement	CYS	Sioux	59 min
Aug 1, 5:55 PM MDT	Special Weather Statement	CYS	Box Butte	50 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 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.