Outflow from a decaying thunderstorm produced a wind gust to 59 mph at the Platte Winner Bridge during the early morning hours of August 24th.
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The episode as NWS FSD wrote it up.
Outflow from a decaying thunderstorm produced a wind gust to 59 mph at the Platte Winner Bridge during the early morning hours of August 24th.
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 Sioux Falls, SD wrote its last area forecast discussion before the first event at Aug 24, 2:04 AM CST, 1 hour 18 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 304 AM CDT Wed Aug 24 2022 .SHORT TERM...(Today and Tonight) Issued at 303 AM CDT Wed Aug 24 2022 Today: Main focus through the morning hours will be on an area of shower and storms currently moving through central SD driven by a subtle west to east moving vort lobe trailing an elongated surface low through southeast SD. This activity currently sits within an area of 1000-1500 J/kg of MUCAPE with decreasing magnitude with eastern extent. As has been the case, hi-res CAMs have largely been useless in capturing this activity but being shortwave-driven, don't see any strong reason why this activity won't continue to propagate eastward thru the morning hours, but would anticipate a weakening trend with time as instability profile becomes less favorable. Previously mentioned surface low slides east with time, into the IA/MN border by afternoon. This will allow winds to take on a more northerly component behind it although not a ton of CAA so highs still in the 80s to near 90, ultimately dependent on longevity of cloud cover and convective debris. Convective chances may be renewed by late afternoon as low level baroclinic zone drops southward. Progged MLCAPE values generally between 1000-2000 J/kg (more aggressive in the NAM) but with weak 500 mb flow, effective deep layer shear sits comfortably under 30 kts. This should keep the overall severe weather threat suppressed although SPC Marginal Risk along/south of I-90 highlights the potential for an isolated stronger updraft capable of hail/wind near severe limits. Tonight: Likely some lingering convection south of I-90 along southward dropping front thru the evening and overnight hours tonight. NAM and RAP guidance try to saturate the lowest layer of the column toward daybreak leaving at least some chance for fog but too much dependence of cloud cover/showers to include in the forecast at this time. .LONG TERM...(Thursday through Tuesday) Issued at 303 AM CDT Wed Aug 24 2022 Thursday: Brief period of shortwave ridging establishes to our west as front settles south of the FA. A more established flow of CAA will keep temperatures in the mid 70s to lower 80s. While some weak and fragmented forcing tries to move through the flow, would expect any shower activity for this period to remain very isolated. Friday: Initial push of elevated instability lifts northeast thru the early/mid morning hours Friday with the NAM slowest and GFS/ECMWF/Canadian quicker. This would be another timeframe to focus on for a more coherent precipitation chance. Southerly return flow also becomes more established by the afternoon pushing temperatures a couple degrees higher over Thursday values although as much as a 10 to 15 degree spread between the 25th and 75th percentile temperatures leaves below normal confidence. Weekend: Forecast clarity doesn't get much better for the weekend. Stronger push of mid level WAA Friday night into Saturday morning keeps "chance" level POPs in the forecast. Meanwhile a highly fractured area of PVA rotates through a broader shortwave trough during the daytime hours Saturday with the more focused vort lobe staying north toward the International Border. This leaves an nebulous and unfocused precipitation forecast in the cards with probably some preference for the daybreak hours and then again late afternoon/evening. Afternoon convection chances will benefit from surface convergence along a boundary near/west of the James River but may be tempered by post wave subsidence. Shear is generally still borderline but may be enough, combined with progged instability to allow for some strong/severe weather threat. This concept is supported by recent CSU machine learning probabilities. Saturday will also likely feature a breezier southerly wind with near/above normal temperatures. More coherent mid/upper level forcing slides east for Sunday and its here where the better precipitation chances reside. With that said, still a couple weak vort lobes to keep at least small chances for the later half of Sunday. At this time, precipitation through the remainder of the week looks to be localized and progressive enough to preclude any widespread beneficial rainfall hopes. This is further supported by low (<20%) ensemble odds of widespread 0.5+ inch rainfall in any given 24 hour window from today through Sunday. Monday and Tuesday: Poor model agreement leaves very low forecast confidence through the later portions of the forecast as models struggle with something as simple as the broader flow pattern under a weak jet regime. The GFS is most aggressive with cutting off a mid/upper low across the Rockies while the ECMWF/Canadian favor a bit more clear cut west coast ridging from the northern stream jet across Canada leaving a general NW flow across our immediate area. This would settle precipitation chances south with time and keep temperatures near or perhaps a shade below normal but likely plenty of adjustments over the coming days as models hopefully converge. && .AVIATION...(For the 06Z TAFS through 06Z Wednesday night) Issued at 1048 PM CDT Tue Aug 23 2022 Current radar shows a small area of showers that have developed just southeast of KFSD, on the nose of the low level jet. The showers may persist for the next few hours but should ultimately weaken with time. The previously mentioned area of low pressure will bring chances for showers throughout the day tomorrow. Have continued VCSH in all TAF sites as confidence remains low in any one location receiving rain. Otherwise, the same low will slowly turn the winds to out of the north/northwest as the low tracks through the area. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && SHORT TERM...Kalin LONG TERM...Kalin AVIATION...Meyers
Hazardous Weather Outlook National Weather Service Sioux Falls SD 319 AM CDT Wed Aug 24 2022 MNZ071-072-080-081-097-SDZ038>040-052>056-250830- Lincoln-Lyon-Murray-Cottonwood-Pipestone-Beadle-Kingsbury-Brookings- Jerauld-Sanborn-Miner-Lake-Moody- 319 AM CDT Wed Aug 24 2022 This Hazardous Weather Outlook is for southwest Minnesota, central South Dakota and east central South Dakota. .DAY ONE...Today and tonight. Occasional isolated to scattered showers and thunderstorms are possible over the next 24 hours. Severe weather is not expected. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Periods of shower and thunderstorm chances remain in the forecast through the weekend although widespread beneficial rainfall is not expected. At this time, Saturday afternoon and evening carries the best chance at a few strong to severe storms. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. IAZ001>003-012>014-020>022-031-032-MNZ089-090-098-NEZ013-014-SDZ050- 057>071-250830- Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Nobles-Jackson-Rock-Dixon-Dakota-Gregory- Brule-Aurora-Davison-Hanson-McCook-Minnehaha-Charles Mix-Douglas- Hutchinson-Turner-Lincoln-Bon Homme-Yankton-Union- 319 AM CDT Wed Aug 24 2022 This Hazardous Weather Outlook is for northwest Iowa, west central Iowa, southwest Minnesota, northeast Nebraska, south central South Dakota and southeast South Dakota. .DAY ONE...Today and tonight. Occasional isolated to scattered showers and thunderstorms are possible over the next 24 hours. While the overall severe weather risk is low, a stronger storm or two may be capable of hail approaching one inch in diameter and wind gusts to around 60 mph. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Periods of shower and thunderstorm chances remain in the forecast through the weekend although widespread beneficial rainfall is not expected. At this time, Saturday afternoon and evening carries the best chance at a few strong to severe storms. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Sioux Falls radar (KFSD), 194 km away, was scanning. The volume nearest the first event began at 09:21 UTC.
1 thunderstorm wind. Local standard time, as filed.
A thunderstorm wind gust of 59 mph was measured by South Dakota Road Weather Information System site SD554 14 miles west of Platte.
After NWS Directive 10-1605, the rules offices file Storm Data by.
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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: 1054592.