An isolated thunderstorm developed in a weakly sheared, slightly unstable environment in southern Lower Michigan. Isolated wind damage occurred during the collapse stage of the storm.
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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 IWX wrote it up.
An isolated thunderstorm developed in a weakly sheared, slightly unstable environment in southern Lower Michigan. Isolated wind damage occurred during the collapse stage of the storm.
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 Northern Indiana wrote its last area forecast discussion before the first event at Jun 12, 1:36 PM EST, 3 hours 48 minutes earlier.
Area Forecast Discussion National Weather Service Northern Indiana 236 PM EDT Sat Jun 12 2021 .SYNOPSIS... Issued at 235 PM EDT Sat Jun 12 2021 Scattered showers and thunderstorms are expected late this afternoon into this evening. A few thunderstorms may become strong to severe with strong winds and torrential downpours the primary threats. Cooler, drier and less humid conditions will prevail Sunday through the middle of next week. && .SHORT TERM...(This Afternoon through Sunday) Issued at 235 PM EDT Sat Jun 12 2021 Widely scattered convection remains on track to develop near a subtle Lake MI enhanced sfc trough late this afternoon, expanding southeast with time into the early evening. This shallow sfc trough and outflow boundaries will likely provide just enough low level convergence to force convection in a moisture/instability rich airmass. Weak flow and effective shear only maximized near 20 knots should limit organization, though will still need to monitor the threat for isolated strong to near-severe gusts in stronger cells as steep low level lapse rates allow DCAPE values to exceed 1000 j/kg. Did retain low PoPs for lingering showers/iso thunder into the late evening and early overnight across southern/eastern zones as the arrival of the true cold front is delayed until early Sunday morning. The passage of this cold front will finally scour out near surface moisture making for a less humid, yet still warm, Sunday with mostly sunny skies and light northerly winds. && .LONG TERM...(Sunday Night through Saturday) Issued at 235 PM EDT Sat Jun 12 2021 Longwave Eastern CONUS upper trough amplification, in response to building heights across the Rockies/High Plains, will send a potent shortwave and cold front sewd through the Great Lakes late Sunday night into Monday. More pronounced dynamics likely bypass off to the nne Monday morning, with the trailing cold front off to the southeast by peak heating on Monday. Kept a mainly dry forecast as a result with a cooler/drier Canadian airmass to build in for Tuesday and Wednesday. A brief warmup is expected then into the second half of next week as the flow regime briefly flattens. Models remain in decent agreement with a frontal passage and renewed rain chances by Thursday night and Friday, with NBM PoPs capped in the low chance range given hints of limited pre-frontal moisture return and slight timing differences in model land. && .AVIATION...(For the 18Z TAFS through 18Z Sunday Afternoon) Issued at 126 PM EDT Sat Jun 12 2021 Main threat for the terminals in the short term will be the storm induced lower flight conditions with a better chance of this occurring at FWA than SBN. Could see conditions dropping into IFR VIS and MVFR CIGs as a result of storms that would initiate during the middle to later afternoon period and then dissipate during the evening. Heavy rain and damaging winds would be the main threat. Outside of that time period, expect VFR conditions. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...NONE. MI...NONE. OH...NONE. LM...NONE. && SYNOPSIS...Steinwedel SHORT TERM...Steinwedel LONG TERM...Steinwedel AVIATION...Roller Visit us at www.weather.gov/iwx Follow us on Facebook...Twitter...and YouTube at: www.facebook.com/NWSNorthernIndiana www.twitter.com/nwsiwx www.youtube.com/NWSNorthernIndiana
Hazardous Weather Outlook...UPDATED National Weather Service Northern Indiana 540 AM EDT Sat Jun 12 2021 INZ003>009-012>018-020-022>027-032>034-MIZ077>081-OHZ001-002-004-005- 015-016-024-025-130945- La Porte-St. Joseph IN-Elkhart-Lagrange-Steuben-Noble-De Kalb-Starke- Pulaski-Marshall-Fulton IN-Kosciusko-Whitley-Allen IN-White-Cass IN- Miami-Wabash-Huntington-Wells-Adams-Grant-Blackford-Jay-Berrien- Cass MI-St. Joseph MI-Branch-Hillsdale-Williams-Fulton OH-Defiance- Henry-Paulding-Putnam-Van Wert-Allen OH- 540 AM EDT Sat Jun 12 2021 /440 AM CDT Sat Jun 12 2021/ This Hazardous Weather Outlook is for northern Indiana, southwest Michigan and northwest Ohio. .DAY ONE...Today and tonight. Storms will develop by late afternoon and be accompanied with torrential rainfall and strong gusty winds. The stronger storms may have downburst potential with wind gusts exceeding 60 mph. .DAYS TWO THROUGH SEVEN...Sunday through Friday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. LMZ043-046-130945- New Buffalo MI to St Joseph MI-Michigan City IN to New Buffalo MI- 540 AM EDT Sat Jun 12 2021 This Hazardous Weather Outlook is for the nearshore waters of southeastern Lake Michigan. .DAY ONE...Today and tonight. Thunderstorms with gusty winds are possible this afternoon. .DAYS TWO THROUGH SEVEN...Sunday through Friday. No hazardous weather is expected at this time.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
230 PM EDT SAT JUN 12 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0904 PM TSTM WND DMG WHITE PIGEON 41.80N 85.65W
06/11/2021 ST. JOSEPH MI PUBLIC
DELAYED REPORT: TREE WITH ROT TOPPLED AT THE
BASE. BRANCHES DOWN ELSEWHERE IN TOWN. VIA
PHONE AND TWITTER. TIME ESTIMATED FROM
RADAR.
&&
BROWNThe Northern Indiana radar (KIWX), 71 km away, was scanning. The volume nearest the first event began at 22:24 UTC.
2 thunderstorm wind. Local standard time, as filed.
Emergency management officials reported large tree branches were blown down, causing some structure damage.
State highway officials reported power lines down onto M-66, with the road being closed for a period of time.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Michigan in 2021Every state in 2021This day in weather historyWarnings in Michigan, June 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: 967049, 967050.