Alert archive / Nebraska / Special Weather Statements in 2012

Special Weather Statement, NWS Cheyenne, WY

July 5, 2012Sioux County, Nebraska

NWS Cheyenne, WY issued this special weather statement at Jul 5, 2012, 9:43 PM MDT for Sioux County, Nebraska. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 5, 2012, 9:43 PM MDT (03:43 UTC)
Expired: Jul 5, 2012, 10:15 PM MDT
In force: 32 min
Issued by: NWS Cheyenne, WY

County Sioux County, NE

The radar

The Rapid City radar (KUDX), 151 km from the middle of the area, began a volume at 03:45 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

Rapid City, SD (KUNR), launched 00:00Z, 3.7 hours before the alert went out and 144 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: 324 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 2266 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 147 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 5, 9:37 PM MDT, 6 minutes earlier.

Area forecast discussion, Jul 5, 9:37 PM MDT, 6 minutes before

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Hazardous weather outlook, Jul 5, 8:42 PM MDT, 1 hour 1 minute before

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In the hours before

Local storm report, Jul 5, 8:20 PM MDT, 1 hour 23 minutes before

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Special weather statement, Jul 5, 8:25 PM MDT, 1 hour 18 minutes before

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Local storm report, Jul 5, 8:29 PM MDT, 1 hour 14 minutes before

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Local storm report, Jul 5, 8:41 PM MDT, 1 hour 2 minutes before

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Local storm report, Jul 5, 9:02 PM MDT, 41 minutes before

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Special weather statement, Jul 5, 9:43 PM MDT, 0 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 5, 6:10 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara, Platte	50 min
Jul 5, 6:35 PM MDT	Special Weather Statement	CYS	Laramie	40 min
Jul 5, 6:44 PM MDT	Special Weather Statement	CYS	Albany	61 min
Jul 5, 7:16 PM MDT	Special Weather Statement	CYS	Niobrara	29 min
Jul 5, 7:46 PM MDT	Special Weather Statement	CYS		29 min
Jul 5, 8:07 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	39 min
Jul 5, 8:25 PM MDT	Special Weather Statement	CYS	Platte	65 min
Jul 5, 8:44 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara	46 min
Jul 6, 1:37 PM MDT	Flash Flood Watch	CYS	Albany, Carbon, Converse, Goshen, Laramie, Platte	50 hr

Nearby

Special Weather Statements in Nebraska, 2012 Every special weather statement in 2012

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.