A mid-level disturbance rotated through cyclonic northwest flow established over the Northern Plains. Scattered storms developed along a weak surface convergence boundary with minimal MLCAPE around 500 J/kg during the afternoon, but managed to yield an isolated damaging wind gust in southeast South Dakota and isolated large hail in southwest Minnesota.
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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 FSD wrote it up.
A mid-level disturbance rotated through cyclonic northwest flow established over the Northern Plains. Scattered storms developed along a weak surface convergence boundary with minimal MLCAPE around 500 J/kg during the afternoon, but managed to yield an isolated damaging wind gust in southeast South Dakota and isolated large hail in southwest Minnesota.
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 15, 7:47 PM CST, 1 hour 55 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Sioux Falls SD 847 PM CDT Mon Jun 15 2026 .KEY MESSAGES... - Scattered showers and isolated thunderstorms move southeast through late evening, diminishing after sunset and ending around midnight. Gusty winds of 40 to 50 mph may accompany these showers/storms through sunset. - A band of showers and isolated thunderstorms are likely Tuesday evening and night, with the better chances northeast of a Huron to Spencer IA line. Severe weather is not expected. - Wednesday will be windy as a spring-like system moves through. Gusts of 45 to 50 mph are likely. Scattered afternoon and evening showers may also bring additional gusty wind threats. && .UPDATE... Issued at 846 PM CDT Mon Jun 15 2026 Scattered showers and very isolated thunderstorms move southeast through this evening, diminishing through the late evening hours. Showers have been producing gusts at times earlier in the evening to around 55 mph, but highest recent gusts have been closer to 50 mph over the last hour. Rainfall amounts have been light given the very high cloud bases - generally a couple hundredths of an inch or less (outside thunderstorms). Activity should move out of the area by midnight or a bit after. Temperatures behind these showers are falling into the 60s, and fall into the 50s later tonight. With some clouds around, it will be another pleasant June night. Winds become a bit lighter overnight, which may lead to some fog development in the James and MO River Valleys, as well as between the James River Valley and the Buffalo Ridge. Confidence is low given the spread in the models, but patchy fog may reduce visibility into the early part of the Tuesday morning commute. No significant changes to Tuesday onward; see below for details. && .DISCUSSION... Issued at 1257 PM CDT Mon Jun 15 2026 Model soundings and the latest hi-res models continue to indicate the potential for strong wind gusts with any shower and thunderstorm activity that develops this afternoon and evening. These wind gusts will be tied to surface based instability of about 200-500 J/kg. Given the diurnal nature of this activity, the best chance for the strong wind gusts will be roughly 4 pm to 9 pm. Only very isolated activity will linger through about 10 pm to midnight. Otherwise a little patchy fog will be possible around the Kingsbury and Brookings county areas late tonight and early Tuesday morning. An unseasonably strong jet max will dive southeast Tuesday into Wednesday. As this jet max moves into the area Tuesday, warm advection will increase with the chances for showers and isolated thunderstorms arriving possibly during the afternoon, but the better chances will be at night. While forcing is fairly strong, instability is lacking due to a fairly deep dry layer in the lower levels. However, with the EML running around 7.5 C and some decent forcing, showers and isolated thunderstorms will be possible with this shot of lift. The better chances appear to be near and northeast of a Huron to Spencer IA line with the best chances in southwest MN. This almost spring or fall like system will bring strong surface winds to the area Wednesday. Gusts of 45 to 50 mph will be likely during the day as mixing brings down some very strong winds aloft. The latest models show a 130 knot jet around 300 mb, with unidirectional flow from the west northwest throughout the atmosphere. While we will have a small convective threat on Wednesday afternoon and evening, model soundings indicate weaker instability than today, but still some 100-300 J/kg surface based CAPE mainly north of I-90. With the strong, unidirectional winds, wind gusts around 50 mph with these showers will be possible. Broad troughiness moves through Thursday and should bring quieter weather and seasonably cool conditions. Weak upper level ridging builds on Friday and will keep quiet weather in place with temperatures back into the upper 70s to mid 80s. Saturday will see a system pass by, possibly a bit to the south. However this will be the next better chance for showers and storms with isolated severe storms possible. Something worth keeping an eye on. && .AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/... Issued at 618 PM CDT Mon Jun 15 2026 Showers and very isolated thunderstorms continue to move southeast through the evening and may produce briefly stronger wind gusts around 35-45 knots. Heavier precipitation may also lead to a brief period of MVFR conditions. A storm moving into northern Jerauld/southern Beadle county at the time of this discussion should remain just south of KHON, so have left mention of -TS out for now. Showers/isolated storms taper off through the evening hours. Otherwise, VFR conditions prevail through the period. Winds through Tuesday afternoon generally remain northwesterly, becoming more west-southwesterly from west to east to end the period. Gusts tomorrow afternoon around 20 knots expected. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. IA...None. NE...None. && UPDATE...SG DISCUSSION...08 AVIATION...SG
Hazardous Weather Outlook National Weather Service Sioux Falls SD 852 PM CDT Mon Jun 15 2026 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ038>040-050-052>071-170200- 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- 852 PM CDT Mon Jun 15 2026 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. Scattered showers and very isolated thunderstorms continue to move southeast late this evening, diminishing around midnight. These showers and isolated storms may produce wind gusts between 40 and 50 mph through 10 pm. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Better chances exist for more widespread showers and thunderstorms Tuesday night into Wednesday morning. While the severe weather potential is low at this time (10%), an occasional strong wind gust up to 50 mph will be possible with some activity. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement National Weather Service Sioux Falls SD 508 PM CDT Mon Jun 15 2026 IAZ001>003-MNZ071-072-080-081-089-090-097-098-SDZ038>040-052>062- 064>067-160015- Lyon-Osceola-Dickinson-Lincoln-Murray-Cottonwood-Nobles-Jackson- Pipestone-Rock-Beadle-Kingsbury-Brookings-Jerauld-Sanborn-Miner- Lake-Moody-Brule-Aurora-Davison-Hanson-McCook-Minnehaha-Douglas- Hutchinson-Turner- Including the cities of Rock Rapids, George, Inwood, Larchwood, Sibley, Spirit Lake, Milford, Arnolds Park, Tyler, Hendricks, Lake Benton, Ivanhoe, Marshall, Slayton, Fulda, Windom, Mountain Lake, Worthington, Jackson, Lakefield, Pipestone, Luverne, Huron, De Smet, Arlington, Lake Preston, Brookings, Wessington Springs, Alpena, Woonsocket, Howard, Madison, Orland, Flandreau, Chamberlain, Kimball, Plankinton, White Lake, Stickney, Mitchell, Alexandria, Emery, Salem, Canistota, Bridgewater, Montrose, Sioux Falls, Armour, Corsica, Delmont, Parkston, Freeman, Menno, Tripp, Clayton, Parker, Centerville, Marion, Viborg, Irene, Hurley, Chancellor, Canton, Lennox, Tea, and Harrisburg 508 PM CDT Mon Jun 15 2026 ...STRONG WIND GUSTS WITH INCOMING SHOWERS AND ISOLATED THUNDERSTORMS EARLY THIS EVENING... Scattered showers and isolated thunderstorms will bring occasional wind gusts of 40 to 60 mph near and north of the Interstate 90 corridor early this evening. The main threat will be near and west of I-29 through 7 pm, spreading east of I-29 from 6 pm to 8 pm. If you have outdoor activities during this time and see showers approaching, be prepared for a quick increase in the winds. BP
Special Weather Statement National Weather Service Sioux Falls SD 706 PM CDT Mon Jun 15 2026 IAZ001>003-MNZ071-072-080-081-089-090-097-098-SDZ038>040-052>062- 064>067-160215- Lyon-Osceola-Dickinson-Lincoln-Murray-Cottonwood-Nobles-Jackson- Pipestone-Rock-Beadle-Kingsbury-Brookings-Jerauld-Sanborn-Miner- Lake-Moody-Brule-Aurora-Davison-Hanson-McCook-Minnehaha-Douglas- Hutchinson-Turner- Including the cities of Rock Rapids, George, Inwood, Larchwood, Sibley, Spirit Lake, Milford, Arnolds Park, Tyler, Hendricks, Lake Benton, Ivanhoe, Marshall, Slayton, Fulda, Windom, Mountain Lake, Worthington, Jackson, Lakefield, Pipestone, Luverne, Huron, De Smet, Arlington, Lake Preston, Brookings, Wessington Springs, Alpena, Woonsocket, Howard, Madison, Orland, Flandreau, Chamberlain, Kimball, Plankinton, White Lake, Stickney, Mitchell, Alexandria, Emery, Salem, Canistota, Bridgewater, Montrose, Sioux Falls, Armour, Corsica, Delmont, Parkston, Freeman, Menno, Tripp, Clayton, Parker, Centerville, Marion, Viborg, Irene, Hurley, Chancellor, Canton, Lennox, Tea, and Harrisburg 706 PM CDT Mon Jun 15 2026 ...STRONG WIND GUSTS WITH SHOWERS AND ISOLATED THUNDERSTORMS THIS EVENING... Scattered showers and isolated thunderstorms continue to bring occasional wind gusts of 40 to 60 mph near and north of the Interstate 90 corridor this evening. Showers and storms diminish near and after sunset. If you have outdoor activities through this evening and see showers approaching, be prepared for a quick increase in the winds.
Preliminary Local Storm Report
National Weather Service Sioux Falls SD
733 PM CDT Mon Jun 15 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0650 PM Tstm Wnd Gst 3 S Chamberlain 43.77N 99.32W
06/15/2026 M54 MPH Brule SD ASOS
ASOS station K9V9 Chamberlain Municipal
Airport.
&&
ASThe Sioux Falls radar (KFSD), 133 km away, was scanning. The volume nearest the first event began at 03:41 UTC.
1 hail. Local standard time, as filed.
Most hail was around one-half inch size, but some was as large as nickels and quarters.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2026Every state in 2026This day in weather historyWarnings in Minnesota, June 2026
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: 1346238.