Alert archive / Wyoming / Special Weather Statements in 2016

Special Weather Statement, NWS Cheyenne, WY

July 27, 2016Niobrara County, Wyoming

NWS Cheyenne, WY issued this special weather statement at Jul 27, 2016, 5:24 AM MDT for Niobrara County, Wyoming. It was in force for 51 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 27, 2016, 5:24 AM MDT (11:24 UTC)
Expired: Jul 27, 2016, 6:15 AM MDT
In force: 51 min
Issued by: NWS Cheyenne, WY

County Niobrara County, WY

The radar

The Cheyenne radar (KCYS), 193 km from the middle of the area, began a volume at 11:23 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 00:00Z, 11.4 hours before the alert went out and 189 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: 850 J/kg
Mixed-layer CIN: -152 J/kg
Mixed-layer LCL: 2499 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: -98 m²/s²
0-3 km storm-relative helicity: -31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

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 27, 3:22 AM MDT, 2 hours 2 minutes earlier.

Area forecast discussion, Jul 27, 3:22 AM MDT, 2 hours 2 minutes before

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In the hours before

Special weather statement, Jul 27, 1:36 AM MDT, 3 hours 48 minutes before

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Special weather statement, Jul 27, 2:06 AM MDT, 3 hours 18 minutes before

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Special weather statement, Jul 27, 4:14 AM MDT, 1 hour 10 minutes before

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Special weather statement, Jul 27, 5:24 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
Jul 27, 1:36 AM MDT	Special Weather Statement	CYS	Niobrara	39 min
Jul 27, 4:14 AM MDT	Special Weather Statement	CYS	Converse, Niobrara	46 min
Jul 27, 3:22 PM MDT	Special Weather Statement	CYS	Laramie	38 min
Jul 27, 3:34 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	26 min
Jul 27, 3:52 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	38 min
Jul 27, 3:55 PM MDT	Special Weather Statement	CYS	Platte	50 min
Jul 27, 4:18 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	27 min
Jul 27, 4:38 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	52 min
Jul 27, 5:06 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	24 min
Jul 27, 5:24 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	51 min
Jul 27, 5:32 PM MDT	Flash Flood Warning	CYS	Laramie	3 hr
Jul 26, 6:14 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Scotts Bluff, Sioux	26 min
Jul 26, 6:37 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	38 min
Jul 26, 6:53 PM MDT	Tornado Warning	CYS	Dawes	15 min
Jul 26, 7:14 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	31 min
Jul 26, 7:36 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes	39 min
Jul 26, 8:15 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte	27 min
Jul 26, 8:22 PM MDT	Special Weather Statement	CYS	Sioux	38 min
Jul 26, 9:30 PM MDT	Special Weather Statement	CYS	Box Butte	45 min
Jul 27, 2:06 AM MDT	Special Weather Statement	CYS	Dawes	39 min
Jul 27, 8:31 AM MDT	Special Weather Statement	CYS	Cheyenne	29 min
Jul 27, 2:49 PM MDT	Special Weather Statement	CYS	Dawes	41 min
Jul 27, 5:50 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Scotts Bluff, Sioux	40 min
Jul 27, 5:59 PM MDT	Tornado Warning	CYS	Banner, Scotts Bluff, Sioux	31 min

Nearby

Special Weather Statements in Wyoming, 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.