A diffuse frontal boundary and several outflow boundaries interacted to cause scattered thunderstorms. While the majority remained below severe limits one storm produced damaging winds.
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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 diffuse frontal boundary and several outflow boundaries interacted to cause scattered thunderstorms. While the majority remained below severe limits one storm produced damaging winds.
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 Jul 3, 1:36 PM EST, 1 hour 24 minutes earlier.
Area Forecast Discussion National Weather Service Northern Indiana 236 PM EDT Mon Jul 3 2017 .SYNOPSIS... Issued at 236 PM EDT Mon Jul 3 2017 A cold front will drift south through the forecast area this evening. This will lead to scattered showers and thunderstorms, especially along and south of highway 30. Though we could see a few stronger storms, severe weather is not expected. Precipitation activity should die out after sunset. Lows will be in the 60s. Independence day looks to be partly cloudy with highs ranging from 80 to 85 degrees. There is a slight chance for showers and thunderstorms along and south of highway 24...west of interstate 69. Severe weather is not expected. && .SHORT TERM...(This Evening through Tuesday) Issued at 236 PM EDT Mon Jul 3 2017 Isolated showers percolating across MI have largely dissipated with orphaned frontal boundary slowly sagging south across our CWA. Still some capping noted on hourly forecast soundings and mesoanalysis but continual diabatic heating and sufficient low level moisture still expected to generate 1000-1500 J/kg of uncapped MLCAPE this afternoon, mainly along and south of US-30. With modest low level convergence in place, expect ISO/SCT showers and storms in our south through the evening. Deep-layer shear values are marginal south of the front (generally less than 25 kts) but suppose its not impossible to see an isolated damaging wind gust given moderate instability. Convection will likely remain pulsey with little/no organization. Isolated showers could continue through much of the night but expect bulk of the activity will simmer down after 01-02Z and kept the post-06Z period dry. Overnight lows will be similar to last night...mid 60s in south and around 60F to the north given cooler/drier postfrontal air and less cloud cover. Left Tue primarily dry with most 12Z guidance continuing trend of stronger AVA/subsidence and surface high pressure over the Great Lakes, forcing surface boundary just S/SW of our CWA. A stray shower may clip our far southern zones but expect primarily dry conditions. Temps and dewpoints may be a degree or two cooler but temp/moisture advections not particularly strong and will be similar to today. && .LONG TERM...(Tuesday Night through Monday) Issued at 236 PM EDT Mon Jul 3 2017 12Z guidance also continued earlier noted trend of later and more southern track to Wednesday night's wave. 12Z deterministic GFS even suggests most of the CWA will remain dry. Confidence in any one scenario remains low with high degree of spread in ensemble guidance and uncertainties with regard to convective modulation upstream. Tried not to make drastic changes to PoP forecast but did lower them a bit (and push them more into Thu) based on latest consensus. Heavy rain still possible given seasonably strong CVA forcing, and ample moisture but obviously will depend on track as to whether our counties are impacted. Better chances look to be south of US-30 at this point. Cold front still set to pass through on Friday but sharp difference in GFS and 03.00Z ECMWF handling of next longwave trough/closed low leading to high uncertainty with regard to weekend forecast. && .AVIATION...(For the 18Z TAFS through 18Z Tuesday Afternoon) Issued at 148 PM EDT Mon Jul 3 2017 A weak cold front draped across Southern Lower Michigan/far northern Indiana will continue its southward progression through the TAF period. Winds out of the NW at the moment will gradually veer to the N-NE as the front passes this afternoon. Given the instability of around 1500-2000 J/Kg present thanks to weak moisture transport and afternoon heating, expect the front to kick of some scattered showers and thunderstorms in the 20Z timeframe, gradually tapering off after we lose the daytime heating around 02Z. Things look to stay VFR for the most part, except maybe a brief downtick to MVFR within any thunderstorms or heavier showers. Though SBN could see an isolated shower or thunderstorm, have much lower confidence as much of the guidance still suggests development south and east of the area- which makes sense given the current position of the frontal boundary. KFWA will probably see a couple of showers or storms tonight, so have VCTS for now given the uncertainty of timing/placement. Otherwise, dry conditions prevail later tonight into Tuesday-with VFR conditions on tap. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...NONE. MI...NONE. OH...NONE. LM...NONE. && SYNOPSIS...MCD SHORT TERM...AGD LONG TERM...AGD AVIATION...MCD 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 309 AM EDT Mon Jul 3 2017 INZ003>009-012>018-020-022>027-032>034-MIZ077>081-OHZ001-002-004-005- 015-016-024-025-040715- 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- 309 AM EDT Mon Jul 3 2017 /209 AM CDT Mon Jul 3 2017/ This hazardous weather outlook is for portions of southwest Michigan...northern Indiana and northwest Ohio. .DAY ONE...Today and Tonight Widely scattered thunderstorms are possible this afternoon into early this evening, mainly across northern Indiana and northwest Ohio. Isolated wind gusts greater than 40 mph, heavy downpours, and lightning will be the primary threats. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday There is a chance for thunderstorms later Wednesday through Friday. Severe thunderstorms are not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. && Stay tuned to NOAA Weather Radio for further details or updates...or check our web site at weather.gov/iwx LMZ043-046-040715- New Buffalo MI to St Joseph MI-Michigan City IN to New Buffalo MI- 309 AM EDT Mon Jul 3 2017 This hazardous weather outlook is for portions of The Nearshore Waters of Southeastern Lake Michigan. .DAY ONE...Today and Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday There is a chance for thunderstorms later Wednesday through Friday. Severe thunderstorms are not expected at this time. && Stay tuned to NOAA Weather Radio for further details or updates...or check our web site at weather.gov/iwx
Special Weather Statement
National Weather Service Northern Indiana
344 PM EDT MON JUL 3 2017
OHZ004-005-032015-
Henry-Defiance-
344 PM EDT MON JUL 3 2017
...A STRONG THUNDERSTORM WILL AFFECT DEFIANCE AND WESTERN HENRY
COUNTIES...
At 344 PM EDT, a strong thunderstorm was located 8 miles south of
Bryan, moving east at 25 mph.
Wind gusts up to 50 mph and half inch hail are possible with this
storm.
Locations impacted include...
Defiance, Farmer, Ney, Florida, Evansport, Jewell, Ridgeville
Corners, Williams Center, Ayersville, The Bend, Brunersburg, Okolona,
Mark Center and Standley.
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 4120 8420 4123 8446 4125 8446 4125 8465
4143 8464 4143 8434 4145 8434 4146 8418
TIME...MOT...LOC 1944Z 271DEG 23KT 4135 8457
CRThe Northern Indiana radar (KIWX), 106 km away, was scanning. The volume nearest the first event began at 20:01 UTC.
2 thunderstorm wind, 2 hail. Local standard time, as filed.
Emergency management officials reported shingles blown off the roof of a garage. SOme tree branches were also broken.
Emergency management reported a tree and several tree limbs, all suffering at least some rot, were blown down.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2017Every state in 2017This day in weather historyWarnings in Ohio, July 2017
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: 705334, 705335, 705330, 705331.