Alert archive / South Dakota / Wind Advisories in 2017
Wind Advisory 23, NWS Rapid City, SD
NWS Rapid City, SD issued this wind advisory at Nov 29, 2017, 2:44 AM MST for 6 counties in South Dakota. It took effect at Nov 29, 2017, 8:47 AM MST. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Nov 29, 2017, 2:44 AM MST (09:44 UTC)
- In effect from
- Nov 29, 2017, 8:47 AM MST
- Expired
- Nov 29, 2017, 6:00 PM MST
- In force
- 9 hr
- Issued by
- NWS Rapid City, SD
Counties Fall River County, SD, Haakon County, SD, Jackson County, SD, Meade County, SD, Pennington County, SD, Ziebach County, SD
The radar
The Rapid City radar (KUDX), 41 km from the middle of the area, began a volume at 09:46 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, 9.7 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2456 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 62 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Nov 28, 9:30 PM MST, 5 hours 14 minutes earlier.
Area forecast discussion, Nov 28, 9:30 PM MST, 5 hours 14 minutes before
Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
930 PM MST Tue Nov 28 2017
.DISCUSSION...(This Evening Through Tuesday)
Issued at 1254 PM MST Tue Nov 28 2017
19z surface analysis had weak departing high pressure over the
northern Plains with a developing lee trough/warm front from
central MT into eastern WY. A typical November day across much of
the CWA with plenty of sunshine. Water vapor showed split upper
trough moving into the Great Lakes with next trough of interest
coming onshore via BC/WA/OR. This feature main concern.
Tonight, upper trough races into the northern Rockies as warm front
sharpens with 4-5mb/3hr pressure falls across the western Dakotas.
This will create the usual windy spots on the open plains,
especially in northeast WY. Low level jet from 45-60kts develops
east of the Black Hills with 50-55kt boundary layer winds over the
Black Hills. 8mb pressure gradient forecast across the Black
Hills overnight into Wednesday morning. Jet below forecast
inversion. Previous studies have shown this is a good setup for a
downslope wind storm so have hoisted a high wind warning to
account; just a wind advisory for Rapid City area with best wind
on far west side of town into the higher hills. Temperatures will
bottom out this evening and then be steady/rise overnight.
Wednesday, upper trough continues to race east pushing a cold front
through the CWA. 850mb winds forecast from 35-50kts with fairly deep
boundary layer mixing. Subsidence and cold air advection not that
impressive, so will leave High Wind Watch in place over northwest
SD. Will likely need a surrounding curtain of Wind Advisories, but
will let later shifts hone. Might even need a wind advisory for
southwest winds ahead of front over central SD. Temperatures will be
near guidance. Moisture will be limited and thus, so will PoPs.
Thursday through Sunday, dry westerly flow aloft expected with
slightly above normal temperatures.
Sunday night through Tuesday, changes are afoot. Upper trough splits
across western North America with increasing northerly flow aloft.
Model confidence low with the main part of each trough, but mean
flow over the CWA consensus appears to indicate near to somewhat
below normal temperatures.
&&
.AVIATION...(For the 06Z TAFS Through 06Z Wednesday Night)
Issued At 928 PM MST Tue Nov 28 2017
VFR conditions are expected through Wednesday morning. South to
southwest winds will increase tonight across NE WY and much of
western SD, ahead of an approaching cold front. Gusts of 35 to 40
kts can be expected at KGCC overnight. Along the northern and
northeastern foothills of the Black Hills...very windy conditions
are also expected tonight with gusts over 60 mph possible. LLWS is
expected on the SD plains including KRAP. These winds will
decrease shortly after sunrise. Winds will then become gusty out
of the northwest tomorrow behind the cold front, with gusts to 60
mph possible across NW SD. Some light rain or snow showers are
possible tomorrow afternoon across NE WY and far western SD behind
the cold front, but mainly VFR conditions expected.
&&
.UNR WATCHES/WARNINGS/ADVISORIES...
SD...High Wind Warning until 8 AM MST Wednesday for SDZ024-025-028-
072.
High Wind Watch from 9 AM MST Wednesday through Wednesday
evening for SDZ001-002-012>014.
Wind Advisory until 8 AM MST Wednesday for SDZ026.
WY...High Wind Warning until 8 AM MST Wednesday for WYZ057.
&&
DISCUSSION...Helgeson
AVIATION...JohnsonHazardous weather outlook, Nov 28, 2:41 PM MST, 12 hours 3 minutes before
Hazardous Weather Outlook National Weather Service Rapid City SD 241 PM MST Tue Nov 28 2017 SDZ024>026-028-072-WYZ057-291400- Northern Black Hills-Northern Foot Hills-Rapid City- Central Black Hills-Sturgis/Piedmont Foot Hills- Wyoming Black Hills- 241 PM MST Tue Nov 28 2017 This Hazardous Weather Outlook is for portions of northwestern South Dakota...southwestern South Dakota...and the Black Hills. .DAY ONE...This Afternoon and Tonight Southerly winds will increase tonight ahead of an approaching cold front. Gusts to 60 mph are expected overnight across portions of northeast Wyoming and the central to northern Black Hills. A High Wind Warning is in effect. Winds will decrease around sunrise Wednesday. .DAYS TWO THROUGH SEVEN...Wednesday through Monday A strong cold front will push through the area Wednesday morning. West to northwest winds will develop behind the front. Sustained winds of 20 to 35 mph and gusts to around 50 mph are possible across the foothills and adjacent plains. The grassland fire danger across the South Dakota plains is forecast to be in the very high to extreme category on Wednesday. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today. && Stay tuned to NOAA weather radio for further updates...or check our web site at weather.gov/rapidcity SDZ001-002-012>014-291400- Harding-Perkins-Butte-Northern Meade Co Plains-Ziebach- 241 PM MST Tue Nov 28 2017 This Hazardous Weather Outlook is for portions of northwestern South Dakota. .DAY ONE...This Afternoon and Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday A strong cold front will push through the area Wednesday morning. West to northwest winds will develop behind the front. Sustained winds of 30 to 45 mph and gusts to over 60 mph are possible. A high wind watch is in effect for late Wednesday morning and afternoon. The grassland fire danger is forecast to be in the extreme category on Wednesday. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today. && Stay tuned to NOAA weather radio for further updates...or check our web site at weather.gov/rapidcity SDZ027-029>032-041>044-046-047-049-073-074-WYZ054>056-058-071- 291400- Southern Foot Hills-Southern Black Hills-Custer Co Plains- Pennington Co Plains-Haakon-Fall River-Oglala Lakota-Jackson- Bennett-Mellette-Todd-Tripp-Southern Meade Co Plains- Hermosa Foot Hills-Northern Campbell-Southern Campbell- Western Crook-Weston-Northeastern Crook- 241 PM MST Tue Nov 28 2017 /341 PM CST Tue Nov 28 2017/ This Hazardous Weather Outlook is for portions of western South Dakota and northeastern Wyoming. .DAY ONE...This Afternoon and Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday A strong cold front will push through the area Wednesday morning. West to northwest winds will develop behind the front. Sustained winds of 20 to 30 mph and gusts to around 50 mph are possible. The grassland fire danger in South Dakota is forecast to be in the very high to extreme category on Wednesday. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today. && Stay tuned to NOAA weather radio for further updates...or check our web site at weather.gov/rapidcity
The office that day
Everything else NWS Rapid City, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 29, 2:44 AM MST | High Wind Warning | UNR | Butte, Harding, Meade, Perkins | 15 hr |
Nearby
Wind Advisories in South Dakota, 2017Every wind advisory in 2017
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.