Alert archive / South Dakota / Blizzard Warnings in 2009
Blizzard Warning 4, NWS Rapid City, SD
NWS Rapid City, SD issued this blizzard warning at Dec 24, 2009, 2:33 PM MST for 15 counties in South Dakota. It took effect at Dec 25, 2009, 5:00 AM MST. It was in force for 41 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 24, 2009, 2:33 PM MST (21:33 UTC)
- In effect from
- Dec 25, 2009, 5:00 AM MST
- Expired
- Dec 26, 2009, 10:25 PM MST
- In force
- 41 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 21:36 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 426 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 170 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this blizzard 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 blizzard warning went out at Dec 24, 3:00 AM MST, 11 hours 33 minutes earlier.
Area forecast discussion, Dec 24, 3:00 AM MST, 11 hours 33 minutes before
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</html>Hazardous weather outlook, Dec 24, 5:30 AM MST, 9 hours 3 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RAPID CITY SD 530 AM MST THU DEC 24 2009 SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058- 071-251400- BENNETT-BUTTE-CENTRAL BLACK HILLS-CUSTER CO PLAINS-FALL RIVER-HAAKON- HARDING-HERMOSA FOOT HILLS-JACKSON-MELLETTE-NORTHEASTERN CROOK- NORTHERN BLACK HILLS-NORTHERN CAMPBELL-NORTHERN FOOT HILLS- NORTHERN MEADE CO PLAINS-PENNINGTON CO PLAINS-PERKINS-RAPID CITY- SHANNON-SOUTHERN BLACK HILLS-SOUTHERN CAMPBELL-SOUTHERN FOOT HILLS- SOUTHERN MEADE CO PLAINS-STURGIS/PIEDMONT FOOT HILLS-TODD-TRIPP- WESTERN CROOK-WESTON-WYOMING BLACK HILLS-ZIEBACH- 530 AM MST (630 AM CST) THU DEC 24 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING. ...WINTER STORM WARNING FOR THE BLACK HILLS AND BEAR LODGE MOUNTAINS THROUGH SATURDAY MORNING... ...WINTER STORM WARNING FOR SOUTH CENTRAL AND PARTS OF WESTERN SOUTH DAKOTA THROUGH SATURDAY MORNING... ...WINTER STORM WARNING FOR THE PLAINS OF FAR WESTERN SOUTH DAKOTA FRIDAY MORNING THROUGH SATURDAY MORNING... ...WINTER WEATHER ADVISORY FOR THE PLAINS OF FAR WESTERN SOUTH DAKOTA THROUGH THURSDAY NIGHT... ...WINTER WEATHER ADVISORY THROUGH SATURDAY MORNING FOR THE SOUTHERN BLACK HILLS AND FALL RIVER COUNTY... .DAY ONE...TODAY AND TONIGHT A PAIR OF LOW PRESSURE SYSTEMS WILL MERGE OVER THE CENTRAL PLAINS INTO THE MIDWEST BY LATE THIS EVENING. THERE WILL BE A BRIEF BREAK IN SNOWFALL EARLY TODAY...BUT SNOW WILL AGAIN INTENSIFY LATER TODAY INTO TONIGHT OVER WESTERN INTO SOUTH CENTRAL SOUTH DAKOTA...ALONG WITH OVER THE WYOMING BLACK HILLS AND BEAR LODGE MOUNTAINS. GUSTY NORTHWEST WINDS WILL BRING AREAS OF BLOWING SNOW REDUCING VISIBILITIES. ALSO...THE WIND WILL COMBINE WITH THE COLD TEMPERATURES TO BRING WIND CHILL VALUES OF 15 TO 35 BELOW ZERO. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY GUSTY NORTHWEST WINDS WILL INCREASE EARLY FRIDAY...BRINGING WIDESPREAD BLOWING SNOW OVER WESTERN AND SOUTH CENTRAL SOUTH DAKOTA WITH VISIBILITIES OF ONE-QUARTER MILE OR LESS AT TIMES PRODUCING NEAR-BLIZZARD CONDITIONS. SNOW WILL ALSO CONTINUE TO FALL ACROSS THE AREA...WITH THE HEAVIEST SNOWS OVER THE BLACK HILLS AND SOUTH CENTRAL SOUTH DAKOTA. CONDITIONS WILL IMPROVE BY MID-DAY SATURDAY AS THE LOW PRESSURE SYSTEM STARTS TO MOVE OUT OF THE AREA...THOUGH SOME BLOWING AND DRIFTING SNOW MAY REMAIN INTO THE EVENING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY.
Nearby
Blizzard Warnings in South Dakota, 2009Blizzard Warnings in Wyoming, 2009Every blizzard warning in 2009
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.