Alert archive / South Dakota / Winter Storm Warnings in 2011
Winter Storm Warning 9, NWS Rapid City, SD
NWS Rapid City, SD issued this winter storm warning at Nov 18, 2011, 12:19 PM MST for 9 counties in South Dakota; Campbell County, Crook County, Weston County, Wyoming. It took effect at Nov 18, 2011, 6:00 PM MST. It was in force for 20 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
- Nov 18, 2011, 12:19 PM MST (19:19 UTC)
- In effect from
- Nov 18, 2011, 6:00 PM MST
- Expired
- Nov 19, 2011, 1:50 PM MST
- In force
- 20 hr
- Issued by
- NWS Rapid City, SD
Counties Butte County, SD, Custer County, SD, Haakon County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD, Ziebach County, SD, Campbell County, WY, Crook County, WY, Weston County, WY
The radar
The Rapid City radar (KUDX), 41 km from the middle of the area, began a volume at 19:19 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, 7.3 hours before the alert went out and 383 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
- 2096 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- -42 m²/s²
- 0-3 km storm-relative helicity
- 188 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 Nov 18, 10:15 AM MST, 2 hours 4 minutes earlier.
Area forecast discussion, Nov 18, 10:15 AM MST, 2 hours 4 minutes before
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</html>Hazardous weather outlook, Nov 18, 5:02 AM MST, 7 hours 17 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RAPID CITY SD 502 AM MST FRI NOV 18 2011 SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058- 071-191400- 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- 502 AM MST (602 AM CST) FRI NOV 18 2011 ...WINTER STORM WATCH TONIGHT AND SATURDAY FOR FOR NORTHEASTERN WYOMING AND MUCH OF WESTERN SOUTH DAKOTA... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING. .DAY ONE...TODAY AND TONIGHT A FAST MOVING BUT POTENT STORM SYSTEM WILL MOVE INTO THE REGION TONIGHT. WIDESPREAD SNOW IS EXPECTED TO DEVELOP ACROSS NORTHWESTERN WYOMING AND WESTERN SOUTH DAKOTA TONIGHT...CONTINUING THROUGH MOST OF THE DAY ON SATURDAY. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY WIDESPREAD SNOW...WITH AREAS OF BLOWING SNOW...WILL CONTINUE ON SATURDAY BEFORE ENDING LATE SATURDAY AFTERNOON. 6 OR MORE INCHES OF SNOW IS EXPECTED...WITH THE HIGHER AMOUNTS AROUND THE BLACK HILLS AND ADJACENT FOOTHILLS AND PLAINS TO THE EAST. STAY TUNED FOR LATER FORECAST UPDATES. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY.
The office that day
Everything else NWS Rapid City, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 18, 12:19 PM MST | Winter Weather Advisory | UNR | Bennett, Butte, Fall River, Harding, Meade, Mellette and 4 more | 26 hr |
Nearby
Winter Storm Warnings in South Dakota, 2011Winter Storm Warnings in Wyoming, 2011Every winter storm warning 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.