Alert archive / South Dakota / Wind Advisories in 2007

Wind Advisory 40, NWS Rapid City, SD

December 21, 20079 counties in South Dakota

NWS Rapid City, SD issued this wind advisory at Dec 21, 2007, 4:42 AM MST for 9 counties in South Dakota. It took effect at Dec 21, 2007, 8:00 AM MST. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Dec 21, 2007, 4:42 AM MST (11:42 UTC)
In effect from: Dec 21, 2007, 8:00 AM MST
Expired: Dec 21, 2007, 11:00 PM MST
In force: 15 hr
Issued by: NWS Rapid City, SD

Counties Bennett County, SD, Custer County, SD, Haakon County, SD, Jackson County, SD, Mellette County, SD, Oglala Lakota County, SD, Todd County, SD, Tripp County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 114 km from the middle of the area, began a volume at 11:46 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 00:00Z, 11.7 hours before the alert went out and 283 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: 1895 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 71 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 21, 3:00 AM MST, 1 hour 42 minutes earlier.

Area forecast discussion, Dec 21, 3:00 AM MST, 1 hour 42 minutes before

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Hazardous weather outlook, Dec 20, 4:11 PM MST, 12 hours 31 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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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 21, 4:42 AM MST	High Wind Warning	UNR	Meade, Pennington	15 hr
Dec 21, 11:47 AM MST	Winter Storm Warning	UNR	Haakon, Jackson, Lawrence, Meade, Pennington, Ziebach	11 hr

Nearby

Wind Advisories in South Dakota, 2007 Every wind advisory in 2007

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.