A squall line dropped southeast into central Indiana from the northwest during the late evening of the 21st and early morning of the 22nd. A portion of the line bowed as it moved into the area producing 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 IND wrote it up.
A squall line dropped southeast into central Indiana from the northwest during the late evening of the 21st and early morning of the 22nd. A portion of the line bowed as it moved into the area producing damaging winds. Thunderstorms caused mainly wind damage across the northern half of central Indiana during this timeframe.
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 Indianapolis, IN wrote its last area forecast discussion before the first event at Jul 21, 10:48 PM EST, 32 minutes earlier.
Area Forecast Discussion National Weather Service Indianapolis IN 1148 PM EDT Fri Jul 21 2017 .UPDATE... The AVIATION Section has been updated below. && .SYNOPSIS... Issued at 332 PM EDT Fri Jul 21 2017 Central Indiana will remain on the edge of a strong upper ridge into Saturday. This will maintain hot and exceptionally humid conditions...along with threat for clusters of thunderstorms to impact the region...especially north tonight and Saturday. A Cold front will move south across Indiana Saturday night and early Sunday. Slightly cooler and drier weather will be the rule early next week as high pressure behind the cold front moves east across our region. frontal boundary will shift south of the area by early Sunday with drier and slightly cooler air spreading into the region for the second half of the weekend. High pressure will bring mainly dry weather with seasonable temperatures beginning early next week. An area of low pressure approaching from the west will produce a chance of more showers and Thunderstorms Thursday and Friday. && .NEAR TERM /Rest of Tonight/... Issued at 1008 PM EDT Fri Jul 21 2017 UPDATE... Increased clouds and overnight lows a few degrees over the northern counties, otherwise no major changes. Scattered showers and thunderstorms continue to impact central Indiana with the highest chances over the northern counties through the night. Updated grids have been sent. PREVIOUS DISCUSSION... A strong upper ridge was over the south central U.S....while a stationary front extended from extreme northern Indiana west across southern Iowa to Nebraska. Models indicate a very unstable airmass south of the front and with low level convergence along the front...especially to our west. Thunderstorms will increase over Iowa and northwest Illinois next several hours and will likely spread east toward northern Indiana by late evening. SPC has our northwest sections in an enhanced risk of severe weather later tonight. Will mention slight chance POPS most areas this evening...increasing to likely POPS near or shortly after midnight across our northwest with stronger thunderstorms spread east across our northern sections late tonight. An isolated thunderstorm may linger into our south early this evening per high res model. Otherwise it should be dry there later tonight. Lows tonight will be in the middle 70s with some lower 70s in a few areas. && .SHORT TERM /Saturday through Monday/... Issued at 332 PM EDT Fri Jul 21 2017 Forecast challenges focus on precip chances mainly Saturday and Saturday night and also with...excessive heat and humidity south. An area of low pressure over the upper midwest will move east across northern Indiana and the southern great lakes Saturday and a cold front will move south across our region Saturday night and early Sunday. Scattered thunderstorms will be the rule over northern sections... while hot humid and mostly dry conditions will occur south with the air mass more capped there. The combination of highs in the middle 90s and high humidities will produce heat index values from 105 to 109 across our south and will continue heat advisories along and south of a Terre Haute to North Vernon line through Saturday. Expect our best chance of thunderstorms to be Saturday evening and raised POPS some area then. The cold front will move south into Kentucky Monday as weak high pressure builds into the great lakes. This will allow for mostly dry and slightly cooler weather Sunday into Monday. In most cases stayed close to a MOS blend on temperatures. && .LONG TERM /Monday night through Friday/... Issued at 237 PM EDT Fri Jul 21 2017 The long term starts out dry with high pressure over the area, and confidence in this dry period is moderate. Lower confidence for the low chance pops that arrive Wednesday, with general model disagreement on any sort of upper wave making it into the area. Higher chances for showers and thunderstorms arrive Thursday and Friday with a front that could stall out as an upper ridge over the area buckles. Temperatures in the mid 80s expected Tuesday with mid to upper 80s Wednesday. Thursday and Friday lower confidence in temperatures due to rain/storm chances, but thicknesses suggest generally mid to upper 80s. && .AVIATION /Discussion for the 22/06Z TAF Issuance/... Issued at 1146 PM EDT Fri Jul 21 2017 Scattered showers and thunderstorms will continue through the TAF period, but conditions will generally be at VFR levels. The exception will be any reduced visibilities and ceilings (MVFR) that could occur with any storms that do form. Winds will generally be south/southwesterly at 8 to 12 kts. && .IND WATCHES/WARNINGS/ADVISORIES... Heat Advisory until 7 PM EDT Saturday for INZ051>053-060>062- 067>072. && SYNOPSIS...JH NEAR TERM...JH/TDUD SHORT TERM...JH LONG TERM....CP AVIATION...TDUD
Hazardous Weather Outlook National Weather Service Indianapolis IN 449 PM EDT Fri Jul 21 2017 INZ021-028-029-222100- Carroll-Warren-Tippecanoe- Including the city of Lafayette 449 PM EDT Fri Jul 21 2017 This hazardous weather outlook is for central Indiana. .DAY ONE...Tonight. Outlook: There is an ENHANCED RISK for Severe storms tonight. Hazards: Damaging winds, heavy rain and localized flooding, isolated tornadoes, large hail, and lightning. Timing: ANytime...but best chances for severe storms after 1100 PM Discussion: Upper level disturbances will interact with hot and humid air to produce some thunderstorms. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. Outlook: Thunderstorm activity is possible at times through Monday. Scattered severe storms will be possible Saturday. Damaging winds and large hail, along with heavy rainfall producing flash flooding, are the primary threats. Hot and humid conditions will be the rule into the weekend. Maximum heat index values from around 95 to near 105 can be expected through Saturday. Discussion: Hot air will remain across central Indiana into the weekend. A front along with upper level disturbances will bring thunderstorm chances to all or parts of the area at times through the weekend. .SPOTTER INFORMATION STATEMENT... Spotter activation is possible through Saturday night. && More information, along with other weather, hydrological and climate information can be found at http://weather.gov/ind INZ030-031-035>049-222100- Clinton-Howard-Fountain-Montgomery-Boone-Tipton-Hamilton-Madison- Delaware-Randolph-Vermillion-Parke-Putnam-Hendricks-Marion-Hancock- Henry- Including the cities of Frankfort, Kokomo, Crawfordsville, Anderson, Muncie, and Indianapolis 449 PM EDT Fri Jul 21 2017 This hazardous weather outlook is for central Indiana. .DAY ONE...Tonight. Outlook: There is a SLIGHT RISK for severe storms this evening and tonight. Hazards: Damaging winds, heavy rain and localized flooding, isolated tornadoes, large hail, and lightning. Timing: Anytime this evening, but the best chances for severe storms will after 1100 PM. Heat will be at its worst during the afternoon and early evening. Discussion: Upper level disturbances will interact with hot and humid air to produce some thunderstorms. Heat index values will top out in the upper 90s to low 100s. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. Outlook: Thunderstorm activity is possible at times through Monday. Scattered severe storms will be possible Saturday. Damaging winds and large hail, along with heavy rainfall producing flash flooding, are the primary threats. Hot and humid conditions will be the rule into the weekend. Maximum heat index values from around 95 to near 105 can be expected through Saturday. Discussion: Hot air will remain across central Indiana into the weekend. A front along with upper level disturbances will bring thunderstorm chances to all or parts of the area at times through the weekend. .SPOTTER INFORMATION STATEMENT... Spotter activation is possible through Saturday night. && More information, along with other weather, hydrological and climate information can be found at http://weather.gov/ind INZ051>057-060>065-067>072-222100- Vigo-Clay-Owen-Morgan-Johnson-Shelby-Rush-Sullivan-Greene-Monroe- Brown-Bartholomew-Decatur-Knox-Daviess-Martin-Lawrence-Jackson- Jennings- Including the cities of Terre Haute, Shelbyville, Bloomington, Columbus, Vincennes, Bedford, and Seymour 449 PM EDT Fri Jul 21 2017 This hazardous weather outlook is for central Indiana. .DAY ONE...Tonight. Outlook: Thunderstorms will be possible at times mainly this evening and tonight. A few severe storms will be possible. Hot conditions expected this afternoon. A heat advisory is in effect for parts of southern Central Indiana. Hazards: Damaging winds, heavy rain and localized flooding, lightning, heat and heat related illnesses. Timing: Storms will be a threat throughout the period, but the best chances for severe storms will be during the late evening and overnight hours. Heat will be at its worst during the afternoon and early evening. Discussion: Upper level disturbances will interact with hot and humid air to produce some thunderstorms. Heat index values will top out from 105-110 degrees. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. Outlook: Thunderstorm activity is possible at times through Monday. Scattered severe storms will be possible Saturday. Damaging winds and large hail, along with heavy rainfall producing flash flooding, are the primary threats. Hot and humid conditions will be the rule into the weekend. Maximum heat index values from around 105 to near 110 can be expected through Saturday. Discussion: Hot air will remain across central Indiana into the weekend. A front along with upper level disturbances will bring thunderstorm chances to all or parts of the area at times through the weekend. .SPOTTER INFORMATION STATEMENT... Spotter activation is possible through Saturday night. && More information, along with other weather, hydrological and climate information can be found at http://weather.gov/ind PUMA
The Indianapolis radar (KIND), 64 km away, was scanning. The volume nearest the first event began at 04:22 UTC.
5 thunderstorm wind. Local standard time, as filed.
Power poles were downed in Edgewood due to damaging thunderstorm wind gusts. This report was received via twitter.
Some tree damage due to damaging thunderstorm wind gusts was noticed from Country Road 750 to 900 East between State Road 26 and Coutny Road 200 North.
Numerous trees were down in multiple portions of the county due to damaging thunderstorm wind gusts.
An estimated 60 mph thunderstorm wind gust was observed in this location. This report was reported via Twitter.
Trees and power lines were downed in several locations due to damaging thunderstorm wind gusts.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2017Every state in 2017This day in weather historyWarnings in Indiana, 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: 714084, 714088, 714089, 714090, 714091.