Alert archive / Wyoming / Special Weather Statements in 2014

Special Weather Statement, NWS Cheyenne, WY

August 9, 2014

NWS Cheyenne, WY issued this special weather statement at Aug 9, 2014, 1:50 AM MDT. It was in force for 55 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: Aug 9, 2014, 1:50 AM MDT (07:50 UTC)
Expired: Aug 9, 2014, 2:45 AM MDT
In force: 55 min
Issued by: NWS Cheyenne, WY

The radar

The Cheyenne radar (KCYS), 194 km from the middle of the area, began a volume at 07:56 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

Denver, CO (KDEN), launched 00:00Z, 7.8 hours before the alert went out and 361 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: 28 J/kg
Mixed-layer CIN: -138 J/kg
Mixed-layer LCL: 2719 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Aug 9, 12:10 AM MDT, 1 hour 40 minutes earlier.

Area forecast discussion, Aug 9, 12:10 AM MDT, 1 hour 40 minutes before

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Hazardous weather outlook, Aug 8, 9:05 PM MDT, 4 hours 45 minutes before

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In the hours before

Special weather statement, Aug 9, 1:50 AM 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
Aug 8, 6:33 PM MDT	Special Weather Statement	CYS	Box Butte	42 min
Aug 8, 6:34 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes, Sioux	41 min
Aug 9, 3:46 PM MDT	Special Weather Statement	CYS	Sioux	29 min
Aug 9, 4:19 PM MDT	Special Weather Statement	CYS	Scotts Bluff	41 min
Aug 9, 4:22 PM MDT	Special Weather Statement	CYS	Morrill	38 min
Aug 9, 4:25 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill	20 min
Aug 9, 4:47 PM MDT	Special Weather Statement	CYS	Banner	28 min
Aug 9, 4:52 PM MDT	Special Weather Statement	CYS	Box Butte	23 min
Aug 9, 5:03 PM MDT	Special Weather Statement	CYS	Box Butte	27 min
Aug 9, 5:39 PM MDT	Special Weather Statement	CYS	Box Butte	21 min

Nearby

Special Weather Statements in Wyoming, 2014 Every special weather statement in 2014

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.