Continued warm air advection and the advancement of steep mid-level lapse rates brought MLCAPE up to 2000 J/kg. Storms evolved into small bowing segments with deep-layer shear up to 50 knots and DCAPE values over 1000 J/kg while moving from south central to southwest Minnesota.
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The episode as NWS FSD wrote it up.
Continued warm air advection and the advancement of steep mid-level lapse rates brought MLCAPE up to 2000 J/kg. Storms evolved into small bowing segments with deep-layer shear up to 50 knots and DCAPE values over 1000 J/kg while moving from south central to 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 6, 6:21 PM CST, 19 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED National Weather Service Sioux Falls SD 721 PM CDT Sat Jun 6 2020 .UPDATE... Issued at 700 PM CDT Sat Jun 6 2020 Early this evening, a storm with a history of producing damaging winds continues to track east/northeast across the I-29 corridor into southwest MN, where weakening is expected as less favorable deep layer shear and instability and lower dew points, reside. Behind this storm across much of southeast SD, showers and isolated thunderstorms continue to develop in mid level warm air advection. Cannot completely rule out an additional isolated strong to severe storm in this region if any remaining outflow boundaries can interact with weaker developing storms, but there is little in the way of stronger upper level forcing. Along and west of the MO River Valley in SD, severe threat lingers overnight as storms from western SD and NE track into central SD where favorable deep layer shear, mid level lapse rates, and elevated instability. && .SHORT TERM...(This Evening through Sunday) Issued at 404 PM CDT Sat Jun 6 2020 Rather disorganized convective scenario over the next 6-12 hours across the eastern Plains, resulting in low confidence in timing, location and strength of convection through tonight. This largely stems from poor initialization/depiction of ongoing elevated storms moving through the James River Valley mid-afternoon. These appear to be tied to zone of strong warm/moist advection as 850mb warm front slowly lifts north through the area. Impact has been to cool low level temperatures, which only serves to strengthen the already strong capping inversion in the wake of the storms. Thus more likely to see continued scattered elevated showers and storms across the western/northern CWA through the late afternoon/early evening. By mid-late evening/overnight, warm front continues to push north, steepening mid-level lapse rates across the region as low level jet increases to 50+kt. While isolated activity is possible in the axis of higher elevated instability south of the warm front, main focus for the overnight period looks to be development across the western Plains which would track into central SD toward 06Z, give or take an hour or two. Modest consensus in the CAMs has this activity sliding across our northwest counties, and will keep pops focused there for tonight. Given lingering uncertainty, opted to keep pops in the mid chance range for now, but these can be adjusted if confidence grows through the next few hours. If storms do work into the James River Valley, deep layer shear of 40+ kt, even above the surface-based inversion, which would be supportive of a few strong-severe storms overnight. This risk should diminish late tonight as storms either track northeast out of our area, or work eastward into more stable air mass. Our region remains in the warm sector through the day Sunday, with warm front well north, and the cool front well west over the High Plains, though the latter is more diffuse with various lingering outflow boundaries possible farther east to start the day. All in all, this should lead to a warm and humid day, with high temps and peak heat indices in the 90s, with storm chances possibly nudging toward our western border by late in the day. .LONG TERM...(Sunday Night through Saturday) Issued at 404 PM CDT Sat Jun 6 2020 Similar to tonight, capped hot dome of air across our region should force the better storm chances Sunday night around our western and northern CWA, possibly scraping through our northwest counties in the evening. These stray storms, if they develop into our CWA, may again be strong to severe given steep mid-level lapse rates and strong shear, but question again is whether storms will develop into our counties, so will leave pops on the lower side, and mainly northwest of a Chamberlain to De Smet line for now. Main focus for the mid-range portion of the forecast will be on the potential for heavy rains late Monday-Tuesday. Pattern progression is halted by remnants of Cristobal lifting northward through the Mississippi Valley, with largely meridional flow across our area ahead of approaching upper level trough. Moisture from the tropical remnants wraps westward into elongated mid-level frontogenetic zone, which best consensus places near/west of I-29 Monday night into early Tuesday. This should result in prolonged period of moderate rainfall, with locally heavy rains possible given precipitable water values approaching 2 inches, which is near the 90th percentile of climatology. SPC Slight Risk appears justified for late afternoon to early evening, given proximity of surface cool front west of I-29 late Monday. However, highest instability remains disjointed from the better shear, with the former east of the boundary, and the latter largely along/west of the boundary. Thus, although isolated strong to severe storms are possible, think potential for locally heavy rainfall will be a greater threat Monday night than severe risk. Could see some lingering rain chances in our east into Wednesday, but this system should largely push to our east by midweek, leaving cooler and less humid air mass in its place. Late week brings high degree of uncertainty, mainly with regard to temperatures, as models are showing very little agreement in evolution of northern stream wave which drops into the lingering Great Lakes trough. With lack of strong signal one way or the other, will stick with blended forecast for now, but be aware that temperatures by Thursday/Friday could be several degrees cooler, or warmer than going forecast. && .AVIATION...(For the 00Z TAFS through 00Z Sunday evening) Issued at 700 PM CDT Sat Jun 6 2020 This evening, isolated thunderstorms remain possible across southeast SD, mainly impacting areas near KBKX to KFSD early this evening and the James River Valley and areas west toward KHON late this evening. Lower coverage of storms and lower confidence in precise timing made thunder chances too low to include in the TAF at this time. Aside from storms, expect VFR conditions to prevail. Gusty southeast winds will continue this evening, peaking upwards of 30 kts with gusts diminishing slightly overnight. As a southerly low level jet around 50 kts builds into the region late this evening, low level wind shear will develop and persist through mid morning on Sunday as well. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && UPDATE...BP SHORT TERM...JH LONG TERM...JH AVIATION...BP
Hazardous Weather Outlook National Weather Service Sioux Falls SD 754 AM CDT Sat Jun 6 2020 SDZ038-039-050-052>054-057>060-063>065-071300- Beadle-Kingsbury-Gregory-Jerauld-Sanborn-Miner-Brule-Aurora-Davison- Hanson-Charles Mix-Douglas-Hutchinson- 754 AM CDT Sat Jun 6 2020 This Hazardous Weather Outlook is for central South Dakota, east central South Dakota, south central South Dakota and southeast South Dakota. .DAY ONE...Today and tonight. Isolated thunderstorms will be possible later this morning through early afternoon, mainly north of Interstate 90. A few storms could produce hail up to half dollar size and winds to 65 mph. While storms are highly unlikely late afternoon and early evening, any storms which do develop would be capable of large hail to golf ball size, winds to 70 mph and even an isolated tornado. The better chance for storms mainly near/west of the James River will spread in later this evening and early in the overnight with a threat for hail up to quarter size and winds to 70 mph. .DAYS TWO THROUGH SEVEN...Sunday through Friday. A few storms will be possible again Sunday evening, which could produce large hail and damaging wind. More storms on Monday afternoon and Monday night will be capable of being severe as well, along with producing areas of heavy rainfall and potentially some flash flooding. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. IAZ001-012-MNZ071-072-080-097-098-NEZ013-SDZ040-055-056-061-062- 066>071-071300- Lyon-Sioux-Lincoln-Murray-Pipestone-Rock-Dixon-Brookings-Lake-Moody- McCook-Minnehaha-Turner-Bon Homme-Yankton-Clay-Union- 754 AM CDT Sat Jun 6 2020 This Hazardous Weather Outlook is for northwest Iowa, southwest Minnesota, northeast Nebraska, east central South Dakota and southeast South Dakota. .DAY ONE...Today and tonight. An isolated thunderstorm is possible during the afternoon north of Interstate 90, with a small chance to produce hail up to quarter size or damaging winds to 60 mph. While storms are quite unlikely south of Interstate 90 later today, if a storm manages to develop toward early evening, it would likely be severe with large hail, damaging wind or a tornado. .DAYS TWO THROUGH SEVEN...Sunday through Friday. A small chance for a thunderstorm will occur Sunday night north of Interstate 90, with a threat for a severe storm toward Highway 14. Additional storms will develop later Monday afternoon, with some likely to be severe. More persistent showers and storms will continue through Monday night into Tuesday, which will be capable of very heavy rainfall and potential flash flooding. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. IAZ002-003-013-014-020>022-031-032-MNZ081-089-090-NEZ014-071300- Osceola-Dickinson-O'Brien-Clay-Plymouth-Cherokee-Buena Vista- Woodbury-Ida-Cottonwood-Nobles-Jackson-Dakota- 754 AM CDT Sat Jun 6 2020 This Hazardous Weather Outlook is for northwest Iowa, west central Iowa, southwest Minnesota and northeast Nebraska. .DAY ONE...Today and tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Thunderstorms will develop later Monday night and continue at times through Tuesday night. A few storms may be severe on Tuesday, but there is a higher probability that storms would produce heavy rainfall and potentially flash flooding. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
211 PM CDT SAT JUN 6 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0112 PM HAIL 1 ENE RAVINIA 43.14N 98.41W
06/06/2020 E0.75 INCH CHARLES MIX SD PUBLIC
REPORTED AT 38862 HWY 50 RAVINIA SD.
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
606 PM CDT SAT JUN 6 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0550 PM TSTM WND DMG 6 NNW SALEM 43.80N 97.43W
06/06/2020 MCCOOK SD TRAINED SPOTTER
TREES DOWN.
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
613 PM CDT SAT JUN 6 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0600 PM TSTM WND GST 7 SW ORLAND 43.82N 97.30W
06/06/2020 M74 MPH MCCOOK SD PUBLIC
&&
PSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
637 PM CDT SAT JUN 6 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0626 PM TSTM WND GST 6 E ORLAND 43.89N 97.06W
06/06/2020 M61 MPH LAKE SD PUBLIC
&&
PSThe Sioux Falls radar (KFSD), 57 km away, was scanning. The volume nearest the first event began at 00:38 UTC.
2 thunderstorm wind. Local standard time, as filed.
RAWS site 216901 (Redstn) 1 mile north northwest of Pipestone measured a peak wind gust of 65 mph.
Automated weather station TKC measured a peak wind gust of 74 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2020Every state in 2020This day in weather historyWarnings in Minnesota, June 2020
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: 905186, 905187.