An isolated thunderstorm developed in a weakly sheared, slightly unstable environment in southern Lower Michigan. The Three Rivers airport recorded a 66 mph wind gusts with a collapsing 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. The Three Rivers airport recorded a 66 mph wind gusts with a collapsing storm. No reports of damage were received.
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 11, 6:22 PM EST, 1 hour 13 minutes earlier.
Area Forecast Discussion National Weather Service Northern Indiana 722 PM EDT Fri Jun 11 2021 .SYNOPSIS... Issued at 1240 PM EDT Fri Jun 11 2021 Hot this afternoon with a low chance of isolated thunderstorms. A cool front will bring a better chance for storms Saturday afternoon with heavy downpours and gusty winds. Drier and less humid weather is ahead for early next week. && .SHORT TERM...(This Afternoon through Saturday) Issued at 233 PM EDT Fri Jun 11 2021 Isolated diurnally driven convection has been slow to develop so far this afternoon with an approaching shortwave ridge becoming more dominant locally. Associated warmer/drier conditions aloft will lead to a dry/hot remainder of the afternoon for most, though diurnal instability could be enough to develop an isolated storm near subtle outflow/lake boundaries late this afternoon. CAMS also hint at the possibility of central MI convection potentially drifting south into our far ne IN and sc MI counties this evening. A series of convectively aided shortwaves will top the shortwave ridge axis southeast into the area later tonight into Saturday. Any associated shower activity should struggle to reach our area tonight into Saturday morning as it outruns any dynamical support. This likely changes by Saturday afternoon as an associated pre- frontal outflow, augmented by a Lake MI lake breeze, works east into the area. Fold over of a the low level thermal ridge with MLCAPE values pushing 1500-2000j/kg suggest decent chances for convection in the vicinity of the boundary, and subsequent outflow boundaries by peak heating. Lacking shear/flow/forcing will likely once again limit organization/coverage to scattered. Deep layer shear magnitudes are progged to top out near 20 knots which should keep the severe threat in check for the most part, though steeper low level lapse rates could present an isolated wind damage threat in stronger cores. && .LONG TERM...(Saturday Night through Friday) Issued at 233 PM EDT Fri Jun 11 2021 Less humid air will filter in post-frontal on Sunday with highs reaching the 80s. Amplification of a Rockies/Plains upper ridge and downstream eastern conus troughing will allow a potent shortwave and cold front to drop through the local area on Monday. Poor moisture return into this fast moving frontal boundary casts doubt on rain chances. Comfortable temps and humidity levels then become established in northerly flow for for the middle of the week. && .AVIATION...(For the 00Z TAFS through 00Z Saturday Evening) Issued at 720 PM EDT Fri Jun 11 2021 VFR conditions through this TAF cycle with a light N/NE flow. Weak frontal boundary approaching Saturday afternoon will bring a chance for SH/TSRA to the area. HREF members inconclusive on coverage of precip so will go with VCSH for now. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...NONE. MI...NONE. OH...NONE. LM...NONE. && SYNOPSIS...Steinwedel/Brown SHORT TERM...Steinwedel LONG TERM...Steinwedel AVIATION...JAL 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 National Weather Service Northern Indiana 321 AM EDT Fri Jun 11 2021 INZ003>009-012>018-020-022>027-032>034-MIZ077>081-OHZ001-002-004-005- 015-016-024-025-120730- 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- 321 AM EDT Fri Jun 11 2021 /221 AM CDT Fri Jun 11 2021/ This Hazardous Weather Outlook is for northern Indiana, southwest Michigan and northwest Ohio. .DAY ONE...Today and tonight. Isolated thunderstorms with brief heavy rain are possible from mid afternoon into early evening. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. There is a good chance for thunderstorms Saturday. The storms may be accompanied with torrential rainfall and gusty winds. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. LMZ043-046-120730- New Buffalo MI to St Joseph MI-Michigan City IN to New Buffalo MI- 321 AM EDT Fri Jun 11 2021 This Hazardous Weather Outlook is for the nearshore waters of southeastern Lake Michigan. .DAY ONE...Today and tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. Thunderstorms with gusty winds are possible Saturday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement National Weather Service Northern Indiana 826 PM EDT Fri Jun 11 2021 MIZ079-120100- St. Joseph- 826 PM EDT Fri Jun 11 2021 ...A STRONG THUNDERSTORM WILL AFFECT CENTRAL ST. JOSEPH COUNTY... At 825 PM EDT, a strong thunderstorm was located near Three Rivers, moving south at 30 mph. Winds in excess of 30 mph and pea size hail are possible with this storm. Locations impacted include... Sturgis, Three Rivers, Constantine, White Pigeon, Centreville, Nottawa, Flowerfield, Mendon, Moore Park, Wasepi, Klinger Lake and Fishers Lake. Torrential rainfall is also occurring with this storm, and may cause localized flooding. Do not drive your vehicle through flooded roadways. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. && LAT...LON 4207 8567 4207 8548 4176 8534 4176 8569 TIME...MOT...LOC 0025Z 352DEG 24KT 4198 8557 HAIL...0.25IN WIND...30MPH JAL
The Northern Indiana radar (KIWX), 68 km away, was scanning. The volume nearest the first event began at 00:37 UTC.
1 thunderstorm wind. Local standard time, as filed.
The automated weather station at the Three Rivers airport (KHAI) recorded a 66 mph wind gust.
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: 967051.