Alert archive / Nebraska / Special Weather Statements in 2017

Special Weather Statement, NWS Cheyenne, WY

March 23, 2017Sioux County, Nebraska

NWS Cheyenne, WY issued this special weather statement at Mar 23, 2017, 3:38 PM MDT for Sioux County, Nebraska. 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 outline as issued.

The facts

Issued: Mar 23, 2017, 3:38 PM MDT (21:38 UTC)
Expired: Mar 23, 2017, 4:15 PM MDT
In force: 37 min
Issued by: NWS Cheyenne, WY

County Sioux County, NE

The radar

The Rapid City radar (KUDX), 161 km from the middle of the area, began a volume at 21:41 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 12:00Z, 9.6 hours before the alert went out and 318 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: 654 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 478 m²/s²
0-3 km storm-relative helicity: 480 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Mar 23, 3:18 PM MDT, 20 minutes earlier.

Area forecast discussion, Mar 23, 3:18 PM MDT, 20 minutes before

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Hazardous weather outlook, Mar 23, 3:05 PM MDT, 33 minutes before

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In the hours before

Special weather statement, Mar 23, 2:49 PM MDT, 49 minutes before

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Special weather statement, Mar 23, 3:38 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
Mar 23, 4:12 AM MDT	Red Flag Warning	CYS		13 hr
Mar 23, 12:40 PM MDT	Winter Storm Warning	CYS	Albany, Laramie	14 hr
Mar 23, 12:40 PM MDT	Winter Weather Advisory	CYS	Albany, Carbon, Laramie	16 hr
Mar 23, 2:49 PM MDT	Special Weather Statement	CYS	Converse	41 min
Mar 23, 5:14 PM MDT	Special Weather Statement	CYS	Goshen	31 min
Mar 23, 5:44 PM MDT	Special Weather Statement	CYS	Goshen	31 min
Mar 23, 5:46 PM MDT	Special Weather Statement	CYS	Box Butte	29 min

Nearby

Special Weather Statements in Nebraska, 2017 Every special weather statement in 2017

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.