Alert archive / South Dakota / High Wind Warnings in 2011

High Wind Warning 16, NWS Rapid City, SD

December 30, 201112 counties in South Dakota; Campbell County, Crook County, Weston County, Wyoming

NWS Rapid City, SD issued this high wind warning at Dec 30, 2011, 2:36 PM MST for 12 counties in South Dakota; Campbell County, Crook County, Weston County, Wyoming. It took effect at Dec 31, 2011, 5:00 AM MST. It was in force for 12 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Dec 30, 2011, 2:36 PM MST (21:36 UTC)
In effect from: Dec 31, 2011, 5:00 AM MST
Expired: Dec 31, 2011, 4:48 PM MST
In force: 12 hr
Issued by: NWS Rapid City, SD

Counties Butte County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Harding County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Ziebach County, SD, Campbell County, WY, Crook County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 36 km from the middle of the area, began a volume at 21:37 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

Bismarck Municip, ND (KBIS), launched 12:00Z, 9.6 hours before the alert went out and 334 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: 651 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this high wind warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Rapid City, SD wrote its last area forecast discussion before this high wind warning went out at Dec 30, 2:23 PM MST, 13 minutes earlier.

Area forecast discussion, Dec 30, 2:23 PM MST, 13 minutes before

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Hazardous weather outlook, Dec 30, 6:07 AM MST, 8 hours 29 minutes before

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The office that day

Everything else NWS Rapid City, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 30, 3:39 AM MST	High Wind Watch	UNR	Butte, Custer, Haakon, Harding, Jackson, Lawrence and 5 more	11 hr
Dec 30, 2:36 PM MST	Wind Advisory	UNR	Bennett, Butte, Custer, Haakon, Harding, Jackson and 9 more	45 hr

Nearby

High Wind Warnings in South Dakota, 2011 High Wind Warnings in Wyoming, 2011 Every high wind warning 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.