Alert archive / South Dakota / Wind Advisories in 2011

Wind Advisory 1, NWS Rapid City, SD

February 12, 201112 counties in South Dakota

NWS Rapid City, SD issued this wind advisory at Feb 12, 2011, 3:05 PM MST for 12 counties in South Dakota. It took effect at Feb 12, 2011, 8:00 PM MST. It was in force for 23 hr.

The area

The counties it named.

The facts

Issued: Feb 12, 2011, 3:05 PM MST (22:05 UTC)
In effect from: Feb 12, 2011, 8:00 PM MST
Expired: Feb 13, 2011, 7:23 PM MST
In force: 23 hr
Issued by: NWS Rapid City, SD

Counties Bennett County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Todd County, SD, Tripp County, SD

The radar

The Rapid City radar (KUDX), 75 km from the middle of the area, began a volume at 22:11 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, 10.1 hours before the alert went out and 322 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: 1184 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 216 m²/s²
0-3 km storm-relative helicity: 306 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 Feb 12, 2:54 PM MST, 11 minutes earlier.

Area forecast discussion, Feb 12, 2:54 PM MST, 11 minutes before

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Hazardous weather outlook, Feb 12, 11:31 AM MST, 3 hours 34 minutes before

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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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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
Feb 12, 11:10 AM MST	High Wind Watch	UNR	Butte, Harding, Meade, Perkins, Ziebach	15 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.