Alert archive / Nebraska / Special Weather Statements in 2016

Special Weather Statement, NWS Cheyenne, WY

July 31, 2016Sioux County, Nebraska

NWS Cheyenne, WY issued this special weather statement at Jul 31, 2016, 3:50 PM MDT for Sioux County, Nebraska. It was in force for 40 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 31, 2016, 3:50 PM MDT (21:50 UTC)
Expired: Jul 31, 2016, 4:30 PM MDT
In force: 40 min
Issued by: NWS Cheyenne, WY

County Sioux County, NE

The radar

The Rapid City radar (KUDX), 182 km from the middle of the area, began a volume at 21:52 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 (KRAP), launched 12:00Z, 9.8 hours before the alert went out and 175 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: 472 J/kg
Mixed-layer CIN: -257 J/kg
Mixed-layer LCL: 1775 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -29 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

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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 31, 3:41 PM MDT, 9 minutes earlier.

Area forecast discussion, Jul 31, 3:41 PM MDT, 9 minutes before

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Hazardous weather outlook, Jul 31, 2:58 PM MDT, 52 minutes before

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In the hours before

Special weather statement, Jul 31, 1:56 PM MDT, 1 hour 54 minutes before

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Special weather statement, Jul 31, 3:23 PM MDT, 27 minutes before

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Special weather statement, Jul 31, 3:50 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 30, 6:51 PM MDT	Special Weather Statement	CYS	Goshen	24 min
Jul 30, 7:16 PM MDT	Special Weather Statement	CYS	Goshen	29 min
Jul 30, 7:42 PM MDT	Special Weather Statement	CYS	Goshen	33 min
Jul 30, 7:48 PM MDT	Special Weather Statement	CYS	Laramie	27 min
Jul 30, 7:58 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Platte	30 min
Jul 30, 8:38 PM MDT	Special Weather Statement	CYS	Laramie	37 min
Jul 30, 9:18 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	27 min
Jul 31, 1:56 PM MDT	Special Weather Statement	CYS	Goshen	49 min
Jul 30, 8:08 PM MDT	Special Weather Statement	CYS	Scotts Bluff	37 min
Jul 30, 9:34 PM MDT	Special Weather Statement	CYS	Dawes	26 min
Jul 30, 10:04 PM MDT	Special Weather Statement	CYS	Dawes	41 min
Jul 31, 3:23 PM MDT	Special Weather Statement	CYS	Sioux	37 min
Jul 31, 4:24 PM MDT	Special Weather Statement	CYS	Kimball	36 min
Jul 31, 5:24 PM MDT	Special Weather Statement	CYS	Box Butte	36 min
Jul 31, 5:28 PM MDT	Special Weather Statement	CYS	Cheyenne	47 min
Jul 31, 5:53 PM MDT	Special Weather Statement	CYS	Cheyenne	37 min

Nearby

Special Weather Statements in Nebraska, 2016 Every special weather statement in 2016

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.