Temperatures were near to around two degrees above normal during the month, while precipitation was spotty, and generally varied from 50 to 100 percent of normal for most areas. Parts of far southeast South Dakota received near 150 percent of normal precipitation.
Every event with a place to put it; 24 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.
Temperatures were near to around two degrees above normal during the month, while precipitation was spotty, and generally varied from 50 to 100 percent of normal for most areas. Parts of far southeast South Dakota received near 150 percent of normal precipitation.
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 Jun 30, 9:27 PM CST, 2 hours 33 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 1027 PM CDT Wed Jun 30 2021 .SHORT TERM...(This Evening through Thursday) Issued at 256 PM CDT Wed Jun 30 2021 Tonight we will remain under the influence of a very weak trough extending west-southwest from a more prominent upper level trough over eastern Canada. This tops an elongated surface ridge axis extending from central Canada into the US Plains. Aside from our diurnal cumulus, which should again dissipate toward sunset, the weak upper level trough will have little impact on our weather tonight, with mostly clear skies and light winds again expected. Could see a little patchy fog again toward daybreak, though any residual boundary layer moisture from recent rainfall has been slowly mixing out, and forecast soundings not as supportive of fog development, so will not include any fog in tonight's forecast. Thursday through Thursday night, the aforementioned weak trough drifts southward, while an upper level ridge becomes the dominant feature across the northern Plains. The lower level ridge axis will shift slightly eastward, from far eastern SD into MN/IA by daybreak Friday. Will see some increase in south-southwesterly low level flow aloft across our western counties as a result, but moisture becomes even more limited with the building ridge aloft, so expect mostly clear skies with light/variable winds gradually favoring southeast to south through Thursday night. Little change in the low level temperatures the next 24-36 hours, so would expect to see highs tomorrow similar to today, from mid 80s east to around 90 west. The mostly clear skies with light winds will allow for comfortable nights with lows in the upper 50s-lower 60s. .LONG TERM...(Thursday Night through Wednesday) Issued at 256 PM CDT Wed Jun 30 2021 Prevailing upper level ridge over the northern Plains Friday will be flattened by a weak trough sliding through southern Canada and the northern US over the holiday weekend. Still seeing little in the way of appreciable moisture to work with in the wake of departing ridge, so precipitation chances will remain limited, perhaps some spotty showers or storms in our far western counties later Saturday night through Monday near an associated surface boundary, with moderate instability indicated in some model solutions during the afternoon or early evening. With very weak flow aloft, shear is quite meager, so don't expect severe weather to threaten 4th of July activities, but cannot rule out that some of Mother Nature's fireworks may have an impact at times. Could see additional waves slide across the region through the first half of next week, as flow aloft settles into quasi-zonal pattern across the northern US. At this range, models are much too varied in their solutions to pinpoint timing/strength of any particular wave. As such, will stick with the smattering of low pops through Tuesday and Wednesday. If/When an area does see rain, temperatures may end up cooler than currently forecast, but on the whole, the flow pattern through the weekend and early next week will favor warming temperatures. Slight cooling appears possible by the middle of next week, with some GEFS and ECMWF ensemble members hinting at a stronger wave bringing some cooler air southward by later Tuesday/Wednesday, but again, too much uncertainty to make any changes to blended forecast at this range. && .AVIATION...(For the 06Z TAFS through 06Z Thursday night) Issued at 1026 PM CDT Wed Jun 30 2021 VFR conditions expected through the TAF period. Winds will be light into Thursday night. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && SHORT TERM...JH LONG TERM...JH AVIATION...JM
Hazardous Weather Outlook National Weather Service Sioux Falls SD 606 PM CDT Wed Jun 30 2021 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ038>040-050-052>071-012315- 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- 606 PM CDT Wed Jun 30 2021 This Hazardous Weather Outlook is for 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...Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. 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.
24 drought. Local standard time, as filed.
Extreme (D3) drought continued through July, spurred on by precipitation which was less than 50 percent of normal at White Lake. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Severe (D2) drought worsened to extreme (D3) drought early in July, spurred on by below normal precipitation and temperatures which averaged 1.6 degrees above normal in Huron. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Extreme (D3) drought moderated after mid-month to severe (D2) drought, courtesy of a period of below normal temperatures as well as over two inches of rainfall at Tyndall. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Severe (D2) drought continued through July, spurred on by precipitation which was around two-thirds of normal and temperatures 2.3 degrees above normal at Brookings. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Extreme (D3) drought continued through July, spurred on by precipitation which was near normal 5 miles south of Chamberlain and around two-thirds of normal near Academy, along with temperatures just over a degree above normal. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Extreme (D3) drought continued through most of July, with conditions moderating to severe (D2) drought for a brief period mid-month. Precipitation was around two-thirds of normal near Academy, along with temperatures just over a degree above normal. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Severe (D2) drought continued through July, spurred on by precipitation which was around two-thirds of normal and temperatures near normal at Vermillion. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Severe (D2) drought worsened to extreme (D3) drought early in July, spurred on by a hot and dry start in Mitchell (7 degrees above normal and no precipitation to start the month). Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Extreme (D3) drought moderated after mid-month to severe (D2) drought, courtesy of a period of below normal temperatures as well as over two inches of rainfall at Tyndall. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Extreme (D3) drought continued through most of July, with conditions moderating to severe (D2) drought for a brief period mid-month following a 10-day period of below normal temperatures and over 3 inches of precipitation at Gregory. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Severe (D2) drought continued through July, spurred on by precipitation which was near normal with temperatures 2.4 degrees above normal at Alexandria. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Severe (D2) drought conditions briefly worsened to extreme (D3) during early July after a week of temperatures over 5 degrees above normal and no precipitation to start the month at Menno. Cooler temperatures with near normal precipitation returned drought to severe levels by mid-month. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Severe (D2) drought worsened to extreme (D3) drought early in July, spurred on by a week of temperatures nearly 7 degrees above normal with little precipitation in Wessington Springs. A 19 day stretch occurred with no precipitation through the mid- to late-month period. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Severe (D2) drought worsened to extreme (D3) drought early in July, spurred on by near normal precipitation and temperatures which averaged 1.5 degrees above normal in De Smet. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Severe (D2) drought worsened to extreme (D3) drought in mid-July, spurred on by less than 50 percent of normal precipitation and temperatures which averaged 1.4 degrees above normal in Madison. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Severe (D2) drought conditions briefly worsened to extreme (D3) during early July after a week of temperatures over 5 degrees above normal and no precipitation to start the month at Canton. Cooler temperatures with above normal precipitation returned drought to severe levels by mid-month. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Severe (D2) drought worsened to extreme (D3) drought early in July, spurred on by a hot and dry start near Salem (6.5 degrees above normal and no precipitation to start the month). Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Severe (D2) drought worsened to extreme (D3) drought early in July, spurred on by a hot and dry start at Howard (nearly 5 degrees above normal and no precipitation to start the month). A 15-day period without precipitation occurred mid- to late-month. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Severe (D2) drought worsened to extreme (D3) drought early in July, spurred on by a hot and dry start at Sioux Falls (6.5 degrees above normal and no precipitation to start the month). A 15-day period with less than a tenth of an inch total precipitation occurred during the mid- to late-month period. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Severe (D2) drought conditions briefly worsened to extreme (D3) during mid to late July. A 15-day stretch occurred mid- to late-month with less than two tenths of an inch precipitation. Monthly average temperatures were around a half degree above normal. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Severe (D2) drought worsened to extreme (D3) drought early in July, spurred on by a week of temperatures around 6 degrees above normal with almost no precipitation near Forestburg. The month ended with two-thirds of normal precipitation near Forestburg, with temperatures around 2 degrees above normal. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Severe (D2) drought conditions briefly worsened to extreme (D3) during early July after a week of temperatures around 5 degrees above normal and no precipitation to start the month near Centerville. Cooler temperatures with above normal precipitation returned drought to severe levels by mid-month. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Severe (D2) drought continued through July, spurred on by precipitation which was near normal with temperatures 1.1 degrees above 6 miles southeast of Centerville. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
Extreme (D3) drought moderated to severe (D2) drought by mid-July as temperatures cooled with a period of almost 1.50 inches of precipitation at Yankton. The final 17 days of the month measured only 0.02 inch precipitation. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.
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, July 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: 967551, 967552, 967553, 967554, 967555, 967556, 967557, 967564, 967568, 967576, 967578, 967580, 967581, 967582, 967584, 967586, 967587, 967590, 967591, 967592, 967593, 967594, 967595, 967596.