Alert archive / South Dakota / Winter Storm Warnings in 2012
Winter Storm Warning 3, NWS Rapid City, SD
NWS Rapid City, SD issued this winter storm warning at Feb 27, 2012, 1:54 PM MST for 9 counties in South Dakota; Crook County, Weston County, Wyoming. It took effect at Feb 28, 2012, 6:00 AM MST. It was in force for 25 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
- Feb 27, 2012, 1:54 PM MST (20:54 UTC)
- In effect from
- Feb 28, 2012, 6:00 AM MST
- Expired
- Feb 29, 2012, 6:38 AM MST
- In force
- 25 hr
- Issued by
- NWS Rapid City, SD
Counties Butte County, SD, Haakon County, SD, Harding County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD, Ziebach County, SD, Crook County, WY, Weston County, WY
The radar
The Rapid City radar (KUDX), 51 km from the middle of the area, began a volume at 20:59 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, 8.9 hours before the alert went out and 302 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 623 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- -31 m²/s²
- 0-3 km storm-relative helicity
- 19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter storm 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 winter storm warning went out at Feb 27, 10:39 AM MST, 3 hours 15 minutes earlier.
Area forecast discussion, Feb 27, 10:39 AM MST, 3 hours 15 minutes before
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</html>The office that day
Everything else NWS Rapid City, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 27, 1:54 PM MST | Winter Weather Advisory | UNR | Bennett, Custer, Fall River, Mellette, Oglala Lakota, Pennington and 2 more | 45 hr |
Nearby
Winter Storm Warnings in South Dakota, 2012Winter Storm Warnings in Wyoming, 2012Every winter storm warning in 2012
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.