Impacts from earlier precipitation continued to allow for a small improvement in drought conditions during December 2021.
Every event with a place to put it; 6 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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 FSD wrote it up.
Impacts from earlier precipitation continued to allow for a small improvement in drought conditions during December 2021.
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 Nov 30, 10:46 PM CST, 1 hour 14 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 1046 PM CST Tue Nov 30 2021 .SHORT TERM...(This Evening through Wednesday) Issued at 222 PM CST Tue Nov 30 2021 Not a bad late fall/early winter day across the region with light winds, sunny skies and temperatures, while cooler than its bordering days, still well above normal. Next wave, evident on satellite imagery currently moving through the Northern Rockies, will push toward our region this evening and overnight. Guidance still in decent agreement with enough WAA associated lift in a deepening moisture layer to produce a west to east moving shield of precipitation through the Northern Plains. Our immediate area sits on the southern fringes of this feature and will also be fighting some drier air in the lower atmosphere. Nonetheless, a bit of neutral to very weak instability in the forecast soundings should allow for enough enhancement to radar returns to allow for at least sprinkles to perhaps a few hundredths of an inch of QPF, mainly for locations northeast of a Huron to Sioux Falls to Spencer line. Increased cloud cover will also keep overnight lows rather mild. It appears Wednesday will be yet another well above normal to perhaps record breaking day across the region. Temperatures above the surface continue to sit in the upper 10th percentile of climatology and would favor widespread 60s to near 70. A solid westerly component of the the low level flow would favor adequate mixing to surface much of this warmer air although some indication in guidance we may be dealing with upper level cirrus which can really dampen things with a time period approaching our minimum sun angle. Given how efficiently we have warmed in past events this fall, will continue to favor temperatures near or above the 90th percentile although any sustained periods of cirrus will cut into these values. Winds above the surface also increase for Wednesday with again the question on how deep we mix and how much of this momentum can surface. Assuming adequate mixing, gusts in the 25 to 35 mph (perhaps a shade higher along the Buffalo Ridge) appear reasonable. This will also help bring fire weather danger back into the conversation with most locations running in the high to perhaps very high category. .LONG TERM...(Wednesday Night through Tuesday) Issued at 222 PM CST Tue Nov 30 2021 Thursday still remains a big question mark with the northwest to southeast oriented thermal gradient draped across the area. Perhaps a bit better convergence with the latest suite of ensemble guidance toward a positioning of this gradient but still a rather large spread. Secondly, surface wind component not nearly as favorable for maximum warming. With this in mind, deterministic NBM has come in below the 50th percentile of the guidance envelope and while have worked these values upward a bit, am hesitant to deviate too far from this thought process for the reasons mentioned above. In either case, another mild day across the board, although the very mild temperatures may end up hanging up closer to the MO River Valley. Relatively stout renewed push of CAA for Friday will put an end to our significant warmth and instead incrementally push us closer to normal values into the weekend. Likely a period we will watch for breezier conditions as well. With a broad NW flow aloft regime remaining through at least the first half of the weekend, precipitation chances remain scarce with perhaps some better moisture return into early next week as progressive west coast troughing establishes itself. && .AVIATION...(For the 06Z TAFS through 06Z Wednesday night) Issued at 1043 PM CST Tue Nov 30 2021 VFR conditions are expected to prevail through the period. Mid level stratus and spotty light rain will exit to the east by 08z. Clearing has already begun from the west as of 05z. LLWS will linger in the vicinity of the passing wave through late tonight. May see winds increase for a few hours with gusts up to 25 kts through 08z or so. South winds will turn southwest and eventually west with gusts of 15-30 kts developing Wednesday morning. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && SHORT TERM...Kalin LONG TERM...Kalin AVIATION...BP
Hazardous Weather Outlook National Weather Service Sioux Falls SD 334 AM CST Tue Nov 30 2021 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ038>040-050-052>071-010945- Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson- Pipestone-Rock-Dixon-Dakota-Beadle-Kingsbury-Brookings-Gregory- Jerauld-Sanborn-Miner-Lake-Moody-Brule-Aurora-Davison-Hanson- McCook-Minnehaha-Charles Mix-Douglas-Hutchinson-Turner-Bon Homme- Yankton-Union- 334 AM CST Tue Nov 30 2021 This Hazardous Weather Outlook is for portions of northwest Iowa, west central Iowa, southwest Minnesota, northeast Nebraska, central South Dakota, east central South Dakota, south central South Dakota, and southeast South Dakota. .DAY ONE...Today and Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The national radar mosaic for the moment the first event began.
6 drought. Local standard time, as filed.
Drought conditions eased from severe (D2) to moderate (D1) early in the month.
Drought conditions eased from severe (D2) to moderate (D1) early in the month.
Drought conditions eased from severe (D2) to moderate (D1) early in the month.
Drought conditions eased from severe (D2) to moderate (D1) early in the month.
Drought conditions eased from severe (D2) to moderate (D1) early in the month.
Drought conditions eased from severe (D2) to moderate (D1) early in the month.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2021Every state in 2021This day in weather historyWarnings in South Dakota, December 2021
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: 992181, 992182, 992183, 992184, 992185, 992186.