Alert archive / Wyoming / Special Weather Statements in 2017

Special Weather Statement, NWS Cheyenne, WY

July 10, 2017Niobrara County, Wyoming

NWS Cheyenne, WY issued this special weather statement at Jul 10, 2017, 3:55 PM MDT for Niobrara County, Wyoming. It was in force for 50 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 10, 2017, 3:55 PM MDT (21:55 UTC)
Expired: Jul 10, 2017, 4:45 PM MDT
In force: 50 min
Issued by: NWS Cheyenne, WY

County Niobrara County, WY

The radar

The Rapid City radar (KUDX), 156 km from the middle of the area, began a volume at 21:57 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

Rapid City, SD (KRAP), launched 12:00Z, 9.9 hours before the alert went out and 149 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: 321 J/kg
Mixed-layer CIN: -363 J/kg
Mixed-layer LCL: 1145 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 86 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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The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 10, 2:47 PM MDT	Special Weather Statement	CYS	Laramie	43 min
Jul 10, 3:39 PM MDT	Special Weather Statement	CYS	Laramie	51 min
Jul 10, 4:42 PM MDT	Special Weather Statement	CYS	Sioux	48 min
Jul 10, 5:23 PM MDT	Special Weather Statement	CYS	Box Butte	67 min

Nearby

Special Weather Statements in Wyoming, 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.