A southeastward moving cold front interacted with a marginally unstable and sheared environment to produce scattered thunderstorms. A few of these storms became severe with isolated reports of wind damage.
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.
A southeastward moving cold front interacted with a marginally unstable and sheared environment to produce scattered thunderstorms. A few of these storms became severe with isolated reports of wind damage.
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 23, 1:10 PM EST, 3 hours 10 minutes earlier.
Area Forecast Discussion National Weather Service Northern Indiana 210 PM EDT Sun Jul 23 2017 .SYNOPSIS... Issued at 210 PM EDT Sun Jul 23 2017 A cold front will bring low chances for scattered showers and thunderstorms this afternoon into this evening. Drier and cooler air then filters in behind this front tonight into early next week. Highs on Monday will reach the mid 70s to near 80 degrees, with highs on Tuesday in the upper 70s to low 80s. Warmer and dry then into Wednesday before the next cold front brings renewed rain and storm chances Wednesday night into Thursday. && .SHORT TERM...(This Evening through Monday) Issued at 210 PM EDT Sun Jul 23 2017 The main focus for the remainder of the afternoon and early evening will be on shower/storm coverage and intensity. Very subtle/diffuse boundaries on the leading edge of an approaching mid level shortwave trough may provide enough of a focus for isolated to widely scattered showers/storms across ne IN/nw OH/sc Lower MI during the mid-late afternoon. Weak forcing/convergence with overall moisture quality in question should limit the coverage and intensity, though cannot rule out an isolated stronger storm given MLCAPE values near 1500-2000 j/kg and deep layer shear ~30 knots. The other feature of note will be scattered convection expected to develop across ne IL/srn WI near the primary cold front. This activity will attempt to survive into areas mainly west of US 31 early this evening, weakening and shifting more south with time thanks to waning diurnal instability and orientation of main instability axis. Passage of the synoptic scale trough will allow cooler and much drier air to filter in later tonight into Monday as flow in the low levels back north-northeast post-frontal. Subsidence/height rises in wake of the trough, with sfc high pressure gradually building in from the northwest, will result in dry conditions and only a scattered CU field on Monday. && .LONG TERM...(Monday Night through Sunday) Issued at 210 PM EDT Sun Jul 23 2017 Dry and noticeably less humid conditions will persist into Monday night and Tuesday under high pressure surface and aloft. Heat/humidity levels then increase into Wednesday as southwest flow returns in advance of an approaching cold front expected to move through the local area later Wednesday night-Thursday with the only real threat for showers/storms during the long term period. Chances for severe storms appear low given marginal shear profiles and unfavorable diurnal timing (another weakening/early morning MCS?). Ample moisture return (not surprising for late July in the Corn Belt) and slowing nature to the frontal slope/convection as it becomes more aligned to weaker mid- level flow could pose a heavy rain threat. This return to storm chances and higher humidity will be brief as the next Canadian shortwave southeast through the Great Lakes brings high pressure and dry conditions back into the picture Friday into next weekend. && .AVIATION...(For the 18Z TAFS through 18Z Monday Afternoon) Issued at 101 PM EDT Sun Jul 23 2017 Showers and thunderstorms are expected to develop this afternoon but should be widely scattered. Kept high end MVFR at SBN this afternoon but that should improve after storms clear out by late this afternoon. Winds during the forecast period will be between 5 and 10 kts generally out of the NW. Drier and VFR flight conditions over the terminals starting this evening through the end of the period. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...NONE. MI...NONE. OH...NONE. LM...NONE. && SYNOPSIS...Steinwedel SHORT TERM...Steinwedel LONG TERM...Steinwedel AVIATION...Heidelberger 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 342 PM EDT Sun Jul 23 2017 INZ004>009-012>018-020-022>027-032>034-MIZ078>081-OHZ001-002-004-005- 015-016-024-025-241945- 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- 342 PM EDT Sun Jul 23 2017 /242 PM CDT Sun Jul 23 2017/ This hazardous weather outlook is for portions of southwest Michigan...northern Indiana and northwest Ohio. .DAY ONE...This afternoon and Tonight Scattered thunderstorms are expected late this afternoon into early this evening. The main threats with any thunderstorms will be wind gusts in excess of 30 mph, lightning, and small hail. .DAYS TWO THROUGH SEVEN...Monday through Saturday There is a chance for thunderstorms Wednesday night into Thursday. .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 INZ003-MIZ077-241945- La Porte-Berrien- 342 PM EDT Sun Jul 23 2017 /242 PM CDT Sun Jul 23 2017/ This hazardous weather outlook is for portions of southwest Michigan and northern Indiana. .DAY ONE...This afternoon and Tonight Isolated thunderstorms will be possible late this afternoon into early this evening. The main threats with any thunderstorms will be wind gusts in excess of 30 mph, lightning, and small hail. .DAYS TWO THROUGH SEVEN...Monday through Saturday Dangerous swimming conditions will be possible on Lake Michigan beaches on Monday. There is a chance for thunderstorms Wednesday night into Thursday. .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 LMZ043-046-241945- New Buffalo MI to St Joseph MI-Michigan City IN to New Buffalo MI- 342 PM EDT Sun Jul 23 2017 This hazardous weather outlook is for portions of The Nearshore Waters of Southeastern Lake Michigan. .DAY ONE...This afternoon and Tonight Isolated thunderstorms will be possible late this afternoon into early this evening. Strong to severe storms are not expected. .DAYS TWO THROUGH SEVEN...Monday through Saturday Conditions may become hazardous for small craft on Monday. There is a chance for thunderstorms Wednesday night into Thursday. && Stay tuned to NOAA Weather Radio for further details or updates...or check our web site at weather.gov/iwx
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
437 PM EDT SUN JUL 23 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0340 PM TSTM WND DMG 3 S BELL CENTER 40.82N 86.65W
07/23/2017 WHITE IN EMERGENCY MNGR
BRANCHES DOWN AND A ROOF COLLAPSED.
&&
CRPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
438 PM EDT SUN JUL 23 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0339 PM TSTM WND DMG 4 E SITKA 40.82N 86.67W
07/23/2017 WHITE IN EMERGENCY MNGR
POLE DOWN.
&&
CRPRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE NORTHERN INDIANA
443 PM EDT SUN JUL 23 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0404 PM HAIL CLYMERS 40.71N 86.45W
07/23/2017 M0.25 INCH CASS IN EMERGENCY MNGR
ALSO ESTIMATED 40 TO 50 MPH WINDS.
&&
CRSpecial Weather Statement
National Weather Service Northern Indiana
444 PM EDT SUN JUL 23 2017
OHZ001-002-004-005-232130-
Henry-Defiance-Fulton-Williams-
444 PM EDT SUN JUL 23 2017
...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT EASTERN DEFIANCE...
HENRY...SOUTHWESTERN FULTON AND SOUTHEASTERN WILLIAMS COUNTIES...
At 444 PM EDT, strong thunderstorms were clustered over Stryker, or
near Archbold, moving southeast at 35 mph.
Wind gusts up to 50 mph and pea size hail are possible with this
storm.
Locations impacted include...
Defiance, Napoleon, Bryan, Wauseon, Archbold, West Unity, Stryker,
Liberty Center, Holgate, Mcclure, Pulaski, Ney, Malinta, Florida, New
Bavaria, Evansport, Grelton, Ridgeville Corners, Gerald and
Ayersville.
This includes Interstate 80 in Ohio between mile markers 22 and 30.
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 4116 8421 4116 8423 4148 8466 4165 8431
4136 8388
TIME...MOT...LOC 2044Z 308DEG 31KT 4150 8437
GHSpecial Weather Statement
National Weather Service Northern Indiana
501 PM EDT SUN JUL 23 2017
INZ009-018-OHZ015-024-232145-
Allen-De Kalb-Van Wert-Paulding-
501 PM EDT SUN JUL 23 2017
...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT ALLEN...SOUTH CENTRAL
DE KALB...SOUTHWESTERN PAULDING AND NORTHWESTERN VAN WERT COUNTIES...
At 501 PM EDT, strong thunderstorms were clustered over Grabill, or
10 miles north of New Haven, moving southeast at 30 mph.
Winds in excess of 40 mph and pea size hail are possible with this
storm.
Locations impacted include...
Fort Wayne, New Haven, Huntertown, Woodburn, Monroeville, Payne,
Grabill, Leo-cedarville, Dixon, Scott, Haviland, Worstville, Harlan,
Edgerton In Allen County, Tipton, Wallen, Spencerville In Dekalb
County, Zulu, Maples and Mcgill.
This includes the following highways...
Interstate 469 between mile markers 15 and 30.
Interstate 69 in Indiana between mile markers 311 and 323.
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 4092 8480 4092 8496 4124 8528 4132 8494
4100 8454
TIME...MOT...LOC 2101Z 315DEG 25KT 4121 8503
GHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
519 PM EDT SUN JUL 23 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0516 PM HEAVY RAIN 3 WSW LEO-CEDARVILLE 41.20N 85.06W
07/23/2017 E1.00 INCH ALLEN IN TRAINED SPOTTER
ALSO HAD PEA SIZED HAIL.
&&
CRThe Northern Indiana radar (KIWX), 132 km away, was scanning. The volume nearest the first event began at 21:21 UTC.
3 thunderstorm wind. Local standard time, as filed.
A trained spotter reported eight inch tree limbs ripped off a healthy tree.
A trained spotter reported roof fascia ripped off, as well as shingles off a store front roof. Some minor structural damage was noted to the roof as well.
Emergency management officials reported a tree was blown down, which landed onto a gas meter, causing a leak. No injuries, fire or explosions were reported.
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: 715898, 715899, 715900.