An isolated thunderstorm developed late morning in a zone of enhanced near-surface vorticity, where the 0-3km CAPE allowed for rapid acceleration to the updraft. During the initial development phase, a brief landspout and funnel cloud quickly formed.
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The episode as NWS FSD wrote it up.
An isolated thunderstorm developed late morning in a zone of enhanced near-surface vorticity, where the 0-3km CAPE allowed for rapid acceleration to the updraft. During the initial development phase, a brief landspout and funnel cloud quickly formed.
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 17, 5:20 AM CST, 4 hours 39 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 620 AM CDT Mon Jun 17 2019 .SHORT TERM...(Today through Tuesday Afternoon) Issued at 347 AM CDT Mon Jun 17 2019 Morning hours today should be rather benign, with a potential for spotty showers or an isolated storm as ill-defined mid-level wave slides along the SD/NE border. By midday, expect coverage of showers and storms to increase, focused near weak low level convergence zone which is expected to be located near/just south of I-90. Could also be scattered elevated showers closer to the 850mb boundary which sags toward the Hwy 14 corridor through the afternoon, but expect coverage/intensity to be lower here than farther south, so will keep pops in the lower end of chance range across our north. As far as severe risk, thermal profiles could support small hail with initial storm development early-mid afternoon, but profiles trend toward moist adiabatic rather quickly, so anticipate brief heavy rain to be more dominant than hail threat. That said, storms expected to be progressive, so concern for flash flooding is low. Afternoon activity should wane during the evening as we lose daytime heating, and the low level boundary drifts further south. However, deeper mid level wave develops over the central High Plains through the overnight, and this could reinvigorate the low level boundary during the latter half of tonight into Tuesday morning as the wave moves east across Nebraska. Although not seeing total agreement on where this boundary will be positioned, greater consensus does place the 925-850mb boundary, and associated axis of precipitation in our far southern CWA, south of Hwy 18, from late tonight through midday Tuesday. Precipitable water averages around 1.5 inches, so rainfall amounts nearing an inch or higher are certainly possible near/south of Highway 18 late tonight through Tuesday. NAM more aggressive with rainfall potential, indicating pockets of 2+ inches, but given the limited instability during this period, as well as uncertainty in location of heavier rain axis, will hold QPF closer to 1 inch for now. Wave/boundary dig a little farther south through the afternoon, so should see precipitation diminish from north to south as focus shifts toward the surface front near/south of I-80. As for short-term temperatures, with weak low-mid level flow, and increasing clouds/rain chances through today, will favor highs closer to the mid-range of guidance rather than the extreme high-end that we have been seeing lately on our drier days. Readings trend downward Tuesday, especially in our southern areas where rain is expected to prevail at least into the early afternoon. .LONG TERM...(Tuesday Evening through Sunday) Issued at 347 AM CDT Mon Jun 17 2019 Split flow could bring a relative dry period for eastern parts of the area later Tuesday night through much of Wednesday. Farther west, warm front lifting back into south central SD by Wednesday afternoon will bring a chance of storms to areas mainly west of the James River late in the day. CAPE profiles are on the skinny side, but with increasing deep layer shear in the late afternoon/evening as mid-upper level winds increase, and warm front in the vicinity, cannot argue with the SPC marginal risk in our western counties. Beyond Wednesday night, pattern transitions to southwesterly as upper trough digs into the northern Rockies. Little agreement in timing/strength of waves rotating around the trough and swinging northeast into the northern Plains. Thus difficult to make meaningful changes to the broad chance range pops Thursday into Friday. Latest models trending drier for our area for the upcoming weekend, but with the upper trough rotating through the northern Plains, seems reasonable to hang onto at least a slight chance of showers/storms late in this forecast period. 850mb temperatures indicate we could see warmer periods between waves from Thursday into the weekend. However, given aforementioned uncertainty in timing, difficult to make significant adjustments to temperatures at this range. && .AVIATION...(For the 12Z TAFS through 12Z Tuesday morning) Issued at 610 AM CDT Mon Jun 17 2019 Isolated showers will possible at all terminals this morning, then scattered thunderstorms this afternoon and evening. The most likely area for thunderstorms is along and south of I-90. Did not mention SHRA or TSRA in TAFs for this evening and overnight due to low confidence in timing and coverage. VFR conditions are expected today; however occasional MVFR/IFR conditions are expected with storms. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && SHORT TERM...JH LONG TERM...JH AVIATION...05
Hazardous Weather Outlook National Weather Service Sioux Falls SD 438 AM CDT Mon Jun 17 2019 IAZ012>014-020>022-031-032-NEZ013-014-SDZ070-071-180945- Sioux-O'Brien-Clay-Plymouth-Cherokee-Buena Vista-Woodbury-Ida-Dixon- Dakota-Union- 438 AM CDT Mon Jun 17 2019 This Hazardous Weather Outlook is for northwest Iowa, west central Iowa, northeast Nebraska and southeast South Dakota. .DAY ONE...Today and tonight. Scattered showers and thunderstorms will be possible through this evening, becoming more likely after midnight tonight. The risk of severe weather is low, however, showers and storms later tonight may produce locally heavy rainfall. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. The risk of locally heavy rainfall will continue into Tuesday, with showers and scattered storms diminishing through the afternoon. Additional chances for thunderstorms are expected late this week, and although timing is somewhat uncertain, conditions may become favorable for isolated strong to severe storms late Friday into Friday night. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. SDZ050-052-057-058-063-064-180945- Gregory-Jerauld-Brule-Aurora-Charles Mix-Douglas- 438 AM CDT Mon Jun 17 2019 This Hazardous Weather Outlook is for central South Dakota and south central South Dakota. .DAY ONE...Today and tonight. Scattered showers and storms will be possible today, becoming more likely near and south of Interstate 90 this afternoon. Stronger storms may produce small hail, but the overall risk of severe weather is low. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. A chance of storms returns late Wednesday and continues through the end of the week. Although timing is somewhat uncertain, conditions may become favorable for isolated strong to severe storms late Wednesday into Wednesday night. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. IAZ001>003-MNZ071-072-080-081-089-090-097-098-SDZ038>040-053>056- 059>062-065>069-180945- Lyon-Osceola-Dickinson-Lincoln-Murray-Cottonwood-Nobles-Jackson- Pipestone-Rock-Beadle-Kingsbury-Brookings-Sanborn-Miner-Lake-Moody- Davison-Hanson-McCook-Minnehaha-Hutchinson-Turner-Bon Homme-Yankton- 438 AM CDT Mon Jun 17 2019 This Hazardous Weather Outlook is for northwest Iowa, southwest Minnesota, east central South Dakota and southeast South Dakota. .DAY ONE...Today and tonight. Scattered showers and storms will be possible today, becoming more likely near and south of Interstate 90 this afternoon. Stronger storms may produce small hail, but the overall risk of severe weather is low. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Additional chances for thunderstorms are expected Wednesday night through late this week. Although exact details are still uncertain, at this time it appears the risk of severe weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
846 AM CDT MON JUN 17 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0513 PM HAIL 2 SSW LYND 44.36N 95.92W
06/11/2019 E1.00 INCH LYON MN PARK/FOREST SRVC
RECEIVED CALL ABOUT DRIFTS OF PEA SIZED HAIL
IN CAMDEN STATE PARK. THERE WERE SOME
NICKELS, AND A FEW QUARTERS AS WELL ALONG
WITH 2.5 INCHES OF RAIN.
&&
ATThe Sioux Falls radar (KFSD), 140 km away, was scanning. The volume nearest the first event began at 15:57 UTC.
1 tornado, 1 funnel cloud. Local standard time, as filed.
A brief landspout spun up near the intersection of 220th Street and 280th Avenue. The tornado traveled slowly eastward over barren cropland, dissipating before reaching 290th Avenue. The average path width was 10 yards.
Photo provided of a funnel cloud between Fostoria and Everly. Photo relayed via broadcast media. Time was estimated from radar.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2019Every state in 2019This day in weather historyThe tornado archive for Iowa, 2019Warnings in Iowa, June 2019
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: 837453, 837446.