Strong southwesterly winds developed for a brief time over portions of northeast Crook County during the early morning, especially in the Beulah area. Sustained winds of 40 mph and gusts to around 55 mph were recorded in Beulah.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS UNR wrote it up.
Strong southwesterly winds developed for a brief time over portions of northeast Crook County during the early morning, especially in the Beulah area. Sustained winds of 40 mph and gusts to around 55 mph were recorded in Beulah.
The local office's own words before the first event, 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 the first event at Sep 18, 3:51 AM MST, 39 minutes earlier. Its key messages:
Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
451 AM MDT Wed Sep 18 2024
.KEY MESSAGES...
- Upper low over southeast MT will create dry gusty winds today
resulting in critical fire weather conditions over portions of
the SD plains
- Elevated fire weather conditions Friday
- Low confidence long term forecast with cooler weather for the
weekend
&&
.DISCUSSION...(Today Through Tuesday)
Issued at 230 AM MDT Wed Sep 18 2024
08z surface analysis had low over KJDN with upper low stacked on
top. Surface trough extended into central NE with cold front into
northeastern WY. Waning band of showers/TS ahead of surface trough
slowly moving north/northeast over central SD per regional radar
loop. Main short term concern revolves around disposition of upper
low.
Today/tonight, upper/surface low spins into southwest SK pushing
a cold front into the CWA this afternoon. Tight pressure gradient
as well as well-mixed boundary layer will promote gusty
west/southwest winds ahead of the cold front and gusty northwest
winds behind the front. Bufkit momentum transfer suggests gusts to
50mph over northwest SD this afternoon/tonight and 45mph over
southern SD today/this evening. HREF supports with >50% chance of
45+ mph for these locations. Will hoist Wind Advisory to account
over northwest SD, but leave out where fire weather headlines are
hoisted on the western SD plains. Backwash moisture will slide
into the WY/MT/SD/ND border areas with showers this
afternoon/tonight. Temperatures will be near guidance.
Thursday, gradient slowly decreases as stacked low pulls away
with slightly cooler temperatures. Friday, warm air advection will
support summery MaxTs with a few spots approaching 90F. Over the
weekend into early next week, progressive west/northwest flow
supports a series of waves and fronts. First front moves through
Friday night with noticeably cooler temperatures for the weekend.
Moisture chances low with main moisture-laden upper low passing
south of the CWA. Confidence is low with substantial ensemble
guidance uncertainty. Chance of >0.25" QPF over the weekend <40%
over southeast half of the CWA and <20% over the northwest half.
Thus, lowish PoPs scattered about for the long term forecast.
&&
.AVIATION...(For the 12Z TAFS Through 12Z Thursday Morning)
Issued At 447 AM MDT Wed Sep 18 2024
VFR conditions are expected through the day with gusty southwest
winds late this morning through this evening. A few showers are
possible this afternoon into tonight across northeastern Wyoming
and northwestern South Dakota. MVFR/IFR ceilings could spread
into far northeastern Wyoming/northwestern South Dakota tonight.
&&
.FIRE WEATHER...
Issued At 230 AM MDT Wed Sep 18 2024
Upper low over eastern MT will promote subsidence, deep boundary
layer mixing, and a tongue of very dry air (HREF >70% chance <20%
RH) over southwest into central SD this afternoon. Gusty
west/southwest winds foreseen, sufficient to hoist a Red Flag
Warning this afternoon and early evening. Northeastern
WY/northwestern SD will see elevated fire weather conditions per
gusty winds and MinRH dipping to 20-30%. Some relief expected
Thursday, but elevated fire weather conditions return Friday with
MinRH 15-30%.
&&
.UNR WATCHES/WARNINGS/ADVISORIES...
SD...Wind Advisory from noon today to noon MDT Thursday for SDZ001-
002-012-078.
Red Flag Warning from noon MDT /1 PM CDT/ today to 8 PM MDT /9
PM CDT/ this evening for SDZ322-324>326-329>335.
WY...None.
&&
DISCUSSION/KEY MESSAGES...Helgeson
AVIATION...7
FIRE WEATHER...HelgesonHazardous Weather Outlook National Weather Service Rapid City SD 353 AM MDT Wed Sep 18 2024 SDZ013-014-026-027-030>032-041>044-046-047-049-073>077-191300- Northern Meade Co Plains-Ziebach-Rapid City-Southern Foothills- Custer Co Plains-Pennington Co Plains-Haakon-Western Fall River- Northern Oglala Lakota-Northern Jackson-Bennett-Mellette-Todd- Tripp-Southern Meade Co Plains-Hermosa Foothills- Eastern Fall River-Southern Oglala Lakota-Southern Jackson- 353 AM MDT Wed Sep 18 2024 /453 AM CDT Wed Sep 18 2024/ This Hazardous Weather Outlook is for portions of western South Dakota. .DAY ONE...Today and Tonight Gusty southwest winds and low relative humidity will result in critical fire weather conditions this afternoon and early evening. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Warm, dry, and locally breezy winds will result in elevated fire weather conditions Thursday and Friday. .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 SDZ001-002-012-024-025-028-029-072-078-WYZ054>060-191300- Harding-Northern Perkins-Butte-Northern Black Hills- Northern Foothills-Central Black Hills-Southern Black Hills- Sturgis/Piedmont Foothills-Southern Perkins-Northern Campbell- Southern Campbell-Western Crook-Wyoming Black Hills- Weston County Plains-Newcastle-Northeastern Crook- 353 AM MDT Wed Sep 18 2024 This Hazardous Weather Outlook is for portions of western South Dakota and northeastern Wyoming. .DAY ONE...Today and Tonight Gusty west-southwest winds will result in elevated fire weather conditions this afternoon. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Warm, dry, and locally breezy winds will result in elevated fire weather conditions Thursday and Friday. .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
Preliminary Local Storm Report
National Weather Service Rapid City SD
521 AM MDT Wed Sep 18 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0450 AM Non-Tstm Wnd Gst 6 NNW Dwtn Spearfish 44.57N 103.92W
09/18/2024 M50 mph Lawrence SD Mesonet
0455 AM Non-Tstm Wnd Gst 4 E Dwtn Spearfish 44.49N 103.79W
09/18/2024 M54 mph Lawrence SD AWOS
&&
07The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2024Every state in 2024This day in weather historyWarnings in Wyoming, September 2024
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1203596.