Alert archive / Wyoming / Special Weather Statements in 2011

Special Weather Statement, NWS Riverton, WY

August 4, 2011Natrona County, Wyoming

NWS Riverton, WY issued this special weather statement at Aug 4, 2011, 5:48 PM MDT for Natrona County, Wyoming. It was in force for 42 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 4, 2011, 5:48 PM MDT (23:48 UTC)
Expired: Aug 4, 2011, 6:30 PM MDT
In force: 42 min
Issued by: NWS Riverton, WY

County Natrona County, WY

The radar

The Riverton/Lander radar (KRIW), 135 km from the middle of the area, began a volume at 23:51 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 (KUNR), launched 12:00Z, 11.8 hours before the alert went out and 329 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: 638 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 1142 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Riverton, WY wrote its last area forecast discussion before this special weather statement went out at Aug 4, 2:18 PM MDT, 3 hours 30 minutes earlier.

Area forecast discussion, Aug 4, 2:18 PM MDT, 3 hours 30 minutes before

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Hazardous weather outlook, Aug 4, 5:00 AM MDT, 12 hours 48 minutes before

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In the hours before

Special weather statement, Aug 4, 2:23 PM MDT, 3 hours 25 minutes before

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Special weather statement, Aug 4, 2:24 PM MDT, 3 hours 24 minutes before

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Special weather statement, Aug 4, 2:26 PM MDT, 3 hours 22 minutes before

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Special weather statement, Aug 4, 2:41 PM MDT, 3 hours 7 minutes before

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Special weather statement, Aug 4, 3:39 PM MDT, 2 hours 9 minutes before

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Special weather statement, Aug 4, 5:48 PM MDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 10:42 PM MDT	Special Weather Statement	RIW	Natrona	48 min
Aug 4, 1:08 PM MDT	Special Weather Statement	RIW	Fremont	37 min
Aug 4, 2:24 PM MDT	Special Weather Statement	RIW	Fremont	51 min
Aug 4, 2:26 PM MDT	Special Weather Statement	RIW	Hot Springs	49 min

Nearby

Special Weather Statements in Wyoming, 2011 Every special weather statement in 2011

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.