An area of convergence, combined with 35 to 40 knots of shear, over 2000 J/KG of CAPE and plenty of moisture all set the stage for thunderstorms to develop over southern Lake Michigan and work southeast. Pockets of wind damage were reported, along with some hail and flooding due to already wet conditions.
Every event with a place to put it. Tap one for its entry below.
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 area of convergence, combined with 35 to 40 knots of shear, over 2000 J/KG of CAPE and plenty of moisture all set the stage for thunderstorms to develop over southern Lake Michigan and work southeast. Pockets of wind damage were reported, along with some hail and flooding due to already wet conditions.
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 7, 2:43 AM EST, 2 hours 17 minutes earlier.
Area Forecast Discussion National Weather Service Northern Indiana 343 AM EDT Fri Jul 7 2017 .SYNOPSIS... Issued at 343 AM EDT Fri Jul 7 2017 Showers and storms are expected today as a front crosses the region. A few of these storms may be severe in the afternoon with damaging winds and large hail the main threats. The best chances for severe weather will be along and south of highway 24. Dry weather then expected overnight through early Sunday with cooler and less humid conditions. The chance for storms returns Sunday night through the middle of next week. && .SHORT TERM...(Today) Issued at 343 AM EDT Fri Jul 7 2017 Convective trends for today remain the top concern of this forecast package. Broad height falls enveloping the Great Lakes and surface cold front slowly sagging south. Disparate clusters of convection (severe at times) continuing to fire ahead of this front, driven mainly by outflow/MCV from earlier storms. Front is not well-defined across WI given this activity but better NW flow and cool/dry air advection still appear across MN and northern WI. Seen some uptick in lightning activity over the last hour or so with more favorably- oriented line approaching GRR but still expect this activity to slowly wane as it approaches IN/OH around sunrise. Moisture convergence/LLJ is just not quite to the level necessary to sustain early morning convection with increasingly diffuse convergence to the E/SE across our area. Last few runs of HRRR (as well as most hi- res CAMs) support this idea with convection decaying over our CWA later this morning. Main question is what impact this will have on our convective chances later today, to which there is still not a clear-cut answer. General trend in 00Z guidance is for a slightly later cold frontal passage, potentially allowing better instability to build in our CWA. There is certainly merit to this idea given surface front is still well upstream and the real prominent shortwave is still in Manitoba at press time. Parameters for at least scattered severe weather are all there. Surface dewpoints are already near 70F and may even climb a degree or two higher as moisture pools ahead of front. Perhaps most disturbing is midlevel lapse rates hovering around 7 C/km. This could yield SBCAPE of 2000+ J/kg by later today. Wind/shear profiles are not exceptional but good enough for some organized clusters. 0-6 km bulk shear values are around 25-30 kts but similar values in the 0-3 km layer with 35-40kt winds at 700mb. This morning convection is the wild card though. Hi-res depletes this activity awfully quick given vigor of current updrafts and some concern that composite outflow and cloud cover could disrupt/cap instability later today. However, still think the effect of this convection will be limited for at least our SE half given the aformentioned factors this morning and the underlying ingredients support a higher risk for severe weather in those SE areas this afternoon, as reflected in the latest SWODY1. Damaging winds and large hail will be the main threats with best guess on timing currently 17-22Z. Expect a quick end to precip around 00Z with strong push of cool/dry air for tonight. && .LONG TERM...(Tonight through Thursday) Issued at 343 AM EDT Fri Jul 7 2017 Tonight into the weekend still looking very pleasant with cool N/NW flow (at least on Saturday), dry air advection, and general subsidence on upwind side of departing trough. 850mb temps drop into the single digits on Sat, yielding highs in the mid to upper 70s under mostly sunny conditions. Surface dewpoints will crash to around 50F and will feel spectacular by July standards (and recent conditions). Overnight lows similarly refreshing, in the mid to upper 50s. Flow does begin to back a bit on Sunday with some late day low-level theta-e advection. Typically overzealous GFS kicks out fairly widespread QPF but suspect any showers will be very isolated. Forcing is highly questionable with a subtle, convectively-enhanced shortwave possibly diving into our region Sunday night. Some modest WAA but system-relative isentropic ascent and moisture advection are weak with lack of any pronounced LLJ. Enough moisture/instability to warrant a slight chance PoP late in the day but expect limited coverage and no severe threat. Mid/upper level flow becomes more zonal heading into the first half of next week, allowing warm/humid conditions to sweep back into the Ohio Valley with periodic showers and storms likely. Largely diurnally driven on Monday but better chances appear Tue/Wed as Hudson Bay low briefly dips S/SE and tightens thermal gradient across southern Great Lakes. Still many details to work out with regard to exact timing and placement of best precip chances so stuck close to concensus initialization with blanket low chance PoPs through much of the period. && .AVIATION...(For the 06Z TAFS through 06Z Friday Night) Issued at 1243 AM EDT Fri Jul 7 2017 VFR conditions prevailing across nrn IN attm and should generally continue through this TAF period, hwvr, there could be lower flight conditions at times in thunderstorms. W-NW flow aloft across the area combined with very unstable airmass to south of ongoing thunderstorms over WI should continue to support se movement of the storms. Latest LAPS data suggests less instability in place over nrn IN/srn MI, but it may still be sufficient to support scattered thunderstorms movg across our area early this morning. Uncertainty remains sufficiently high to maintain just VCTS in the terminals. 00z NAM indicating airmass will become very unstable over nrn IN today as cdfnt moves through, supporting thunderstorm development by midday. Outflow from ongoing storms could prevent this destabilization from taking place, so again, opted for just VCTS mention in terminals attm. SW winds will veer NW today as the front moves through with dry post-frontal conditions expected across the area by 00z. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...NONE. MI...NONE. OH...NONE. LM...NONE. && SYNOPSIS...AGD SHORT TERM...AGD LONG TERM...AGD AVIATION...JT 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 555 AM EDT Fri Jul 7 2017 INZ004>009-012>018-020-022>027-032>034-MIZ078>081-OHZ001-002-004-005- 015-016-024-025-081000- 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- 555 AM EDT Fri Jul 7 2017 /455 AM CDT Fri Jul 7 2017/ This hazardous weather outlook is for portions of southwest Michigan...northern Indiana and northwest Ohio. .DAY ONE...Today and Tonight Thunderstorms are possible again this afternoon. Some of these storms may be severe. The best chances for severe weather will be along and south of highway 24. Damaging winds and large hail are the main threats. .DAYS TWO THROUGH SEVEN...Saturday through Thursday There are chances for thunderstorms through much of next week. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon. && Stay tuned to NOAA Weather Radio for further details or updates...or check our web site at weather.gov/iwx INZ003-MIZ077-081000- La Porte-Berrien- 555 AM EDT Fri Jul 7 2017 /455 AM CDT Fri Jul 7 2017/ This hazardous weather outlook is for portions of southwest Michigan and northern Indiana. .DAY ONE...Today and Tonight Hazardous swimming conditions are possible along Lake Michigan beaches late today and into tonight. Thunderstorms are possible again later today but severe weather is not expected at this time. .DAYS TWO THROUGH SEVEN...Saturday through Thursday There are chances for thunderstorms through much of next week. .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 LMZ043-046-081000- New Buffalo MI to St Joseph MI-Michigan City IN to New Buffalo MI- 555 AM EDT Fri Jul 7 2017 This hazardous weather outlook is for portions of The Nearshore Waters of Southeastern Lake Michigan. .DAY ONE...Today and Tonight Conditions hazardous to small craft may be possible late today and into tonight. Thunderstorms are possible again later today but severe weather is not expected at this time. .DAYS TWO THROUGH SEVEN...Saturday through Thursday There are chances for thunderstorms through much of next week. && 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
431 AM EDT FRI JUL 7 2017
MIZ079>081-070900-
Branch-Hillsdale-St. Joseph-
431 AM EDT FRI JUL 7 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHEASTERN ST.
JOSEPH...BRANCH AND NORTHERN HILLSDALE COUNTIES...
At 431 AM EDT, radar indicated strong thunderstorms were located
along a line extending from Albion to 7 miles southeast of Vicksburg.
Movement was southeast at 45 mph.
Wind gusts of 50 to 55 mph and nickel size hail are possible with
these storms.
Locations impacted include...
Coldwater, Hillsdale, Bronson, Jonesville, Quincy, Union City,
Litchfield, Colon, Long Lake, Jerome, Somerset, Girard, Kinderhook,
Moscow, Batavia, Leonidas, Mendon, Gilead, North Adams and Sherwood.
This includes Interstate 69 in Michigan between mile markers 2 and
21.
LAT...LON 4197 8436 4176 8506 4176 8511 4207 8558
4207 8437
TIME...MOT...LOC 0831Z 297DEG 40KT 4223 8478 4203 8547
NWSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
455 AM EDT FRI JUL 7 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0454 AM TSTM WND GST 1 NE MOSCOW 42.06N 84.50W
07/07/2017 E50 MPH HILLSDALE MI TRAINED SPOTTER
SMALL BRANCHES DOWN.
&&Special Weather Statement
National Weather Service Northern Indiana
502 AM EDT FRI JUL 7 2017
MIZ081-OHZ001-002-070930-
Hillsdale-Fulton-Williams-
502 AM EDT FRI JUL 7 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT HILLSDALE...CENTRAL
FULTON AND NORTHEASTERN WILLIAMS COUNTIES...
At 502 AM EDT, radar indicated strong thunderstorms were located
along a line extending from near Addison to Reading. Movement was
southeast at 45 mph.
Wind gusts of 50 to 55 mph are possible with these storms.
Locations impacted include...
Hillsdale, Archbold, Morenci, Hudson, West Unity, Pioneer, Fayette,
Reading, Cambria, Pittsford, Ransom, Metamora, Lyons, Waldron, North
Adams, Bear Lake, Prattville, Oakshade, Alvordton and Seward.
This includes Interstate 80 in Ohio between mile markers 17 and 36.
LAT...LON 4149 8436 4186 8480 4205 8436 4171 8436
4172 8388 4168 8388
TIME...MOT...LOC 0902Z 315DEG 40KT 4201 8428 4183 8476
NWSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
508 AM EDT FRI JUL 7 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0440 AM TSTM WND GST CENTREVILLE 41.92N 85.53W
07/07/2017 E50 MPH ST. JOSEPH MI AMATEUR RADIO
&&Special Weather Statement National Weather Service Northern Indiana 527 AM EDT FRI JUL 7 2017 INZ007-009-OHZ001-004-071000- De Kalb-Steuben-Defiance-Williams- 527 AM EDT FRI JUL 7 2017 ...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN STEUBEN... NORTHEASTERN DE KALB...NORTHWESTERN DEFIANCE AND SOUTHERN WILLIAMS COUNTIES... At 526 AM EDT, a strong thunderstorm was located over Hamilton, or 7 miles southeast of Angola, moving southeast at 35 mph. Wind gusts of 50 to 55 mph and dime size hail are possible with this storm. Locations impacted include... Bryan, Montpelier, Butler, Edgerton, Hamilton, Edon, Edgerton In Williams County, Columbia, Pulaski, Farmer, Blakeslee, Alvarado, Williams Center, Melbern, Hamilton Lake, Artic, Hallock, Berlien, Metz and Steubenville. This includes the following highways... Interstate 80 in Indiana between mile markers 155 and 156. Interstate 80 in Ohio between mile markers 0 and 1. LAT...LON 4154 8504 4167 8491 4152 8443 4128 8461 TIME...MOT...LOC 0926Z 299DEG 29KT 4157 8490 NWS
Special Weather Statement
National Weather Service Northern Indiana
559 AM EDT FRI JUL 7 2017
OHZ002-004-005-016-071030-
Henry-Defiance-Putnam-Fulton-
559 AM EDT FRI JUL 7 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTH CENTRAL PUTNAM...
DEFIANCE...HENRY AND SOUTHEASTERN FULTON COUNTIES...
At 559 AM EDT, radar indicated strong thunderstorms were located
along a line extending from near Swanton to 6 miles south of Bryan.
Movement was southeast at 45 mph.
Wind gusts up to 50 mph and dime size hail are possible with these
storms.
Locations impacted include...
Defiance, Napoleon, Swanton, Deshler, Liberty Center, Holgate,
Mcclure, Farmer, Hamler, Texas, Ney, Malinta, Florida, New Bavaria,
Evansport, Grelton, Ridgeville Corners, Gerald, Ayersville and
Colton.
LAT...LON 4110 8423 4117 8434 4121 8434 4121 8442
4124 8446 4125 8446 4125 8449 4139 8472
4143 8455 4143 8434 4147 8434 4157 8388
4118 8388
TIME...MOT...LOC 0959Z 301DEG 38KT 4154 8387 4139 8457
NWSThe Northern Indiana radar (KIWX), 132 km away, was scanning. The volume nearest the first event began at 10:00 UTC.
2 hail, 1 thunderstorm wind. Local standard time, as filed.
Emergency management officials reported six utility poles were snapped along State Route 108 and County Road N.
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: 715911, 715908, 715909.