A frontal boundary, as well as several outflow boundaries, interacted with a weakly unstable environment to produce scattered showers and thunderstorms. A series of mergers allowed one thunderstorm in Huntington county to produce a handful of reports of damaging wind as well as marginally several hail.
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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.
A frontal boundary, as well as several outflow boundaries, interacted with a weakly unstable environment to produce scattered showers and thunderstorms. A series of mergers allowed one thunderstorm in Huntington county to produce a handful of reports of damaging wind as well as marginally several hail.
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 Sep 8, 2:15 PM EST, 1 hour 20 minutes earlier.
Area Forecast Discussion National Weather Service Northern Indiana 315 PM EDT Tue Sep 8 2020 .SYNOPSIS... Issued at 1255 PM EDT Tue Sep 8 2020 Scattered showers and thunderstorms are possible late this afternoon and overnight primarily over northern Indiana, but could push into northwest Ohio areas this evening. Dry and cool weather expected Wednesday. && .SHORT TERM...(This Evening through Wednesday) Issued at 313 PM EDT Tue Sep 8 2020 A theta-e boundary lies across our northwest mainly from Winamac, OH to Pioneer OH and that is where the best moisture lies for the rest of the day today. Some clearing east of I-69 allows for a little warmer high temperatures in that area before a weak shortwave traversing the the base of the theta-e boundary fills the cloud cover back in later this afternoon. This shortwave will be accompanied by better large scale ascent, some low to mid level moisture and 1.6 in PWATs, which allows for the possibility of more heavy rain there as well as the possibility of some gusty winds. There could be some heavy rain from training or slow moving cells if rain can move into areas east of I-69 to end the day. As we head into the latter part of the overnight into early Wednesday, the theta-e boundary retreats a little bit to the northwest and so while cloud cover remains across areas northwest of US-24, rainfall potential is expected to decrease. Winds are expected to stay up some overnight without any sort of decoupling across the northwest so would expect a stratus type of setup tonight in that area. Some decoupling of winds occurs south of I-69, so could see more of a fog development in that area. && .LONG TERM...(Wednesday Night through Tuesday) Issued at 313 PM EDT Tue Sep 8 2020 The large scale pattern across the CONUS is characterized by a large trough across the western US and a ridge across the eastern US with a boundary across the region here locally. Some waffling north and south of this front is possible from Wednesday through much of Saturday. However, models aren't sending any shortwaves through the flow towards the region while low level moisture decreases through this period so am more inclined to keep noticeable PoPs out of the forecast. Some weaker large scale ascent and mid layer omega enters back into the forecast from the south ahead of an approaching trough that was over the Plains and passes by to the north later Saturday into Saturday night providing an increase in moisture and PoPs as a result. The severe weather threat during this time period depends on the timing of the front during that Saturday and Sunday period, but it looks low at this time. Behind the trough from the Plains, models are advertising just a passing blow from the cold air that has been much discussed hitting the central US. It should just bring seasonable to slightly below normal temperatures, but dry conditions for the beginning of next week. && .AVIATION...(For the 18Z TAFS through 18Z Wednesday Afternoon) Issued at 1255 PM EDT Tue Sep 8 2020 Stalled ofb invof KFWA terminal expected to reactivate this aftn given favorable destabilization along a KMCX KFWA KDFI line. Stalled sfc front lies immediately nw yet se of KSBN where MVFR stratus had developed. VCTS/VCSH possible here later late evening yet considered too low a risk for a mention. Elevated convective cluster over cntrl IL in association with well defined MCV near KMLI may clip late aftn before hand. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...NONE. MI...NONE. OH...NONE. LM...NONE. && SYNOPSIS...T/Roller SHORT TERM...Roller LONG TERM...Roller AVIATION...T 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 341 PM EDT Tue Sep 8 2020 INZ004>009-012>018-020-022>027-032>034-MIZ078>081-OHZ001-002-004-005- 015-016-024-025-091945- 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-Cass MI- St. Joseph MI-Branch-Hillsdale-Williams-Fulton OH-Defiance-Henry- Paulding-Putnam-Van Wert-Allen OH- 341 PM EDT Tue Sep 8 2020 /241 PM CDT Tue Sep 8 2020/ This Hazardous Weather Outlook is for northern Indiana, southwest Michigan and northwest Ohio. .DAY ONE...This afternoon and tonight. Thunderstorms this afternoon will likely produce locally heavy rainfall which may cause minor flooding of some urban areas. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Thunderstorms are possible this weekend, but are not expected to become severe. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. INZ003-MIZ077-091945- La Porte-Berrien- 341 PM EDT Tue Sep 8 2020 /241 PM CDT Tue Sep 8 2020/ This Hazardous Weather Outlook is for northern Indiana and southwest Michigan. .DAY ONE...This afternoon and tonight. There is a moderate swim risk along the southeast shore of Lake Michigan. Thunderstorms are possible this afternoon, but are not expected to become severe, but may cause minor flooding of some urban areas. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Thunderstorms are possible this weekend, but are not expected to become severe. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. LMZ043-046-091945- New Buffalo MI to St Joseph MI-Michigan City IN to New Buffalo MI- 341 PM EDT Tue Sep 8 2020 This Hazardous Weather Outlook is for the nearshore waters of southeastern Lake Michigan. .DAY ONE...This afternoon and tonight. Thunderstorms are likely this evening, but are not expected to become severe. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Thunderstorms are possible this weekend, but are not expected to become severe. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Northern Indiana radar (KIWX), 55 km away, was scanning. The volume nearest the first event began at 20:35 UTC.
4 thunderstorm wind, 2 hail. Local standard time, as filed.
Emergency management officials reported a large tree limb down onto a house.
Emergency management officials reported a tree was blocking the roadway.
Emergency management officials reported a tree was blown down.
Quarter size fell for 5 minutes at the Huntington North High School.
Quarter size hail was reported near US 24 and North County Road 200 East.
Emergency management officials reported that a semi was parked along I-69 along mile marker 290. The semi was blown over by strong winds with the driver suffering minor injuries.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2020Every state in 2020This day in weather historyWarnings in Indiana, September 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: 914665, 914666, 914667, 914663, 914664, 914668.