Alert archive / South Dakota / Wind Advisories in 2011

Wind Advisory 36, NWS Rapid City, SD

December 30, 201115 counties in South Dakota

NWS Rapid City, SD issued this wind advisory at Dec 30, 2011, 2:36 PM MST for 15 counties in South Dakota. It took effect at Dec 31, 2011, 8:00 AM MST. It was in force for 28 hr.

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, 8:00 AM MST
Expired: Jan 1, 2012, 12:00 PM MST
In force: 28 hr
Issued by: NWS Rapid City, SD

Counties Bennett County, SD, Butte County, SD, Custer County, SD, Haakon County, SD, Harding County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Todd County, SD, Tripp County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 52 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

Aberdeen, SD (KABR), launched 12:00Z, 9.6 hours before the alert went out and 311 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: 527 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 155 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 wind advisory 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 wind advisory 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	High Wind Warning	UNR	Butte, Custer, Fall River, Haakon, Harding, Jackson and 6 more	26 hr

Nearby

Wind Advisories in South Dakota, 2011 Every wind advisory 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.