A strong thunderstorm crossed into Indiana from Illinois during the evening of the 22nd of July. The storm started to weaken as it moved eastward, but produced wind damage in Shakamak State Park before weakening fully.
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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 strong thunderstorm crossed into Indiana from Illinois during the evening of the 22nd of July. The storm started to weaken as it moved eastward, but produced wind damage in Shakamak State Park before weakening fully.
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 22, 5:54 PM EST, 1 hour 46 minutes earlier.
Area Forecast Discussion National Weather Service Indianapolis IN 654 PM EDT Sat Jul 22 2017 .UPDATE... The AVIATION Section has been updated below. && .SYNOPSIS... Issued at 338 AM EDT Sat Jul 22 2017 Central Indiana will remain on the edge of a strong upper ridge through tonight....maintaining hot and exceptionally humid conditions. Chances for thunderstorms will continue until a frontal boundary can push through the area overnight into early Sunday. A secondary front may bring additional scattered storms on Sunday evening before high pressure builds in with mainly dry weather and seasonable temperatures for the early part of the week. && .NEAR TERM /Rest of Today/... Issued at 1005 AM EDT Sat Jul 22 2017 .Update...Radar indicated a cluster of thunderstorms across central Illinois was moving into the northwest part of our forecast area. Satellite indicated tops were warming and this area will weaken as it moves eastward. The storms will probably dissipate by early afternoon and then more storms redeveloping late today as indicated by the high res model. Made a few minor tweaks to temperatures...but overall current forecast temperatures are on track. Portion of previous near term discussion follows... Convection and heat remain the primary concerns for today once again as the region resides on the periphery of the heat ridge. The first order of business will focus on the potential for severe convection prior to daybreak with expectations of additional robust storm development by late day over northern counties near the sagging frontal boundary. With moisture pooling and a surge of heating ahead of the approaching frontal boundary...potential is there for dewpoints to hang in the mid and upper 70s into the afternoon as temps surge into the 90s. This will promote a strongly unstable airmass by late afternoon with MLCAPEs nearing 4000 J/KG being realized immediately ahead of the front over northern counties. With a low level jet likely to energize over the region by late day and a remnant outflow boundary from the morning convection setting up over northern portions of the forecast area...expect convection to erupt quickly after 21Z and grow upscale rapidly into the evening aided by cooling aloft. Damaging winds will be the primary severe weather threat but all forms of severe weather will be possible. Precip water values above 2 inches will support a continuing heavy rain and flooding threat as well. Temps...as mentioned above...heat and humidity will again be factors today. Expect highs ranging from the upper 80s over northeast counties where convective impacts lend towards more uncertainty on temps to mid 90s in the lower Wabash Valley. Max heat indices again will get above 100 degrees in most areas with the highest values over southwest counties. The heat advisory will continue in its current state and location until 23Z. && .SHORT TERM /Tonight through Monday Night/... Issued at 338 AM EDT Sat Jul 22 2017 Forecast challenges focus on precip chances...especially tonight and again late Sunday and Sunday evening. Convection will likely be ongoing this evening as development takes place over northern counties and progresses southeast through the evening and overnight ahead of the cold front. A surface wave along the boundary...continued influence of a low level jet...BL shear values around 30kts and a strongly unstable airmass all support a threat for severe storms this evening gradually transitioning into more of a heavy rain threat overnight. Highest pops will be employed over the eastern half of the area where parameters will be just a bit more favorable for more widespread convection. Precip water values will remain above 2 inches and combined with freezing levels near 15kft supporting warm rain processes...torrential rainfall and flooding will continue to be concerns as the storms surge south overnight. Growing confidence that most if not all of the convection will be out of the forecast area by 12Z Sunday with the front settling south of the Ohio River. Much of the day Sunday should be dry with an edge being taken off the humidity levels. A secondary front associated with a sharp upper wave diving out of the western Great Lakes may serve as a focal point for renewed convective development to the northwest of the region Sunday afternoon...possibly spreading into the northern half of the forecast area during the evening. Steep mid level lapse rates in response to cooling aloft suggestive that strongest storms may carry a damaging wind and large hail threat. Will bring low chance pops back into the northern counties Sunday evening as a result. Convection will diminish overnight Sunday with high pressure building south into the region on Monday with cooler and noticeably less humid air. Likely to see diurnal cu develop on Monday before skies become mostly clear Monday night. Temps...it will remain very warm on Sunday with low level thermals supporting highs from the mid 80s to around 90. Temps will fall back into the lower and middle 80s Monday with cooler air aloft advecting into the region. Lows will slide back into the 60s through the period. && .LONG TERM /Tuesday night through Saturday/... Issued at 220 PM EDT Sat Jul 22 2017 The long term begins with central Indiana under the influence of upper ridging, thus resulting in warming temperatures and dry weather Tuesday night through early Wednesday night. By late Wednesday night some model runs indicate the ridge could begin to be suppressed as an upper wave travels through to the northwest and thus bring a chance for thunderstorms back into the forecast on Thursday. Friday currently looks like a cold front will move through the area, and have chances for thunderstorms dropping off in its wake. Result is thunderstorm chances Thursday through Friday with dry conditions building in by Friday night. Long term temperatures will peak on Wednesday with highs in the upper 80s to lower 90s before dropping a couple degrees on Thursday due to cloud cover and another degree or two for Friday with the cold front moving through. Medium confidence in the return of storm chances late in the week, and in cooler temperatures (low to mid 80s). && .AVIATION /DISCUSSION FOR 23/0000Z TAF ISSUANCE/... Issued at 645 PM EDT Sat Jul 22 2017 Complex situation this evening with several convective boundaries across central parts of Indiana. One lies across southern parts of Indiana from LUK - HUF, while another more frontal boundary extends from near FWA - CMI. A cold front extends from south central WI into northeast MO. It is the frontal boundary that is expected to move slowly into IL tonight and trigger more storms across central IL into west and central IN. Right now, central IN is in a trough of instability with a small amount of convective inhibition that is holding things back right now. So, we have VFR for the time being. Will have to wait and see when the boundary fires tonight and see if a MCS gets going later tonight into the morning hours. If storms become widespread, would expect IFR near the storms. Confidence: Low on timing on thunderstorms. If develop they should be widespread. && .IND WATCHES/WARNINGS/ADVISORIES... Heat Advisory until 7 PM EDT this evening for INZ051>053-060>062- 067>072. && SYNOPSIS...Ryan NEAR TERM...Ryan/JH SHORT TERM...Ryan LONG TERM....CP AVIATION...DWM
Hazardous Weather Outlook National Weather Service Indianapolis IN 517 PM EDT Sat Jul 22 2017 INZ021-028>031-035>049-054>057-063>065-232130- Carroll-Warren-Tippecanoe-Clinton-Howard-Fountain-Montgomery-Boone- Tipton-Hamilton-Madison-Delaware-Randolph-Vermillion-Parke-Putnam- Hendricks-Marion-Hancock-Henry-Morgan-Johnson-Shelby-Rush-Brown- Bartholomew-Decatur- Including the cities of Lafayette, Frankfort, Kokomo, Crawfordsville, Anderson, Muncie, Indianapolis, Shelbyville, and Columbus 517 PM EDT Sat Jul 22 2017 This hazardous weather outlook is for central Indiana. .DAY ONE...Tonight. Outlook: There is a threat for severe thunderstorms...especially late this evening into tonight. Hazards: Damaging winds, heavy rain and localized flooding, isolated tornadoes, large hail, and dangerous lightning. High heat indices up to 100 this evening. Timing: Best chances for severe storms are expected from late evening into tonight. The highest heat indices will occur into the early evening. Discussion: Thunderstorms are expected to develop late this evening and tonight ahead of a cold front. Hot and humid conditions are expected through the evening. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Outlook: Scattered thunderstorms are possible Sunday and Sunday evening (southern counties). A few of these storms could be severe. Scattered thunderstorms will also be possible again at times from Wednesday night through Friday. Damaging winds and large hail, along with heavy rainfall producing flash flooding, are the primary threats. Discussion: A secondary frontal boundary will bring the chance for thunderstorms Sunday and Sunday evening (southern counties). The next chance for thunderstorms will come on Wednesday night ahead of a cold front dropping south from the Great Lakes. .SPOTTER INFORMATION STATEMENT... Spotter activation is possible through tonight. && More information, along with other weather, hydrological and climate information can be found at http://weather.gov/ind INZ051>053-060>062-067>072-232130- Vigo-Clay-Owen-Sullivan-Greene-Monroe-Knox-Daviess-Martin-Lawrence- Jackson-Jennings- Including the cities of Terre Haute, Bloomington, Vincennes, Bedford, and Seymour 517 PM EDT Sat Jul 22 2017 This hazardous weather outlook is for central Indiana. .DAY ONE...Tonight. Outlook: There is a threat for severe storms...especially this evening into the overnight. Hot conditions expected this evening. A heat advisory is in effect until 7 pm. Hazards: Damaging winds, heavy rain and localized flooding, lightning, heat and heat related illnesses with heat indices of 105 to 108 degrees. Timing: Best chances for severe storms are expected primarily this evening into tonight. The highest heat indices will occur into the early evening. Discussion: Thunderstorms are expected to develop late this evening and tonight ahead of a cold front. Hot and humid conditions are expected yet again through this evening. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Outlook: Scattered thunderstorms are possible Sunday and Sunday evening. A few of these storms could be severe. Scattered thunderstorms will also be possible again at times from Wednesday night through Friday. Damaging winds and large hail, along with heavy rainfall producing flash flooding, are the primary threats. Discussion: A secondary frontal boundary will bring the chance for thunderstorms Sunday and Sunday evening. The next chance for thunderstorms will come on Wednesday night ahead of a cold front dropping south from the Great Lakes. .SPOTTER INFORMATION STATEMENT... Spotter activation is possible through tonight and again Sunday. && More information, along with other weather, hydrological and climate information can be found at http://weather.gov/ind
Special Weather Statement
National Weather Service Indianapolis IN
733 PM EDT SAT JUL 22 2017
INZ051-052-060-230000-
Clay IN-Vigo IN-Sullivan IN-
733 PM EDT SAT JUL 22 2017
...SPECIAL WEATHER STATEMENT...
At 732 PM EDT, Doppler radar was tracking a strong thunderstorm near
West Union, or 8 miles southeast of Marshall, moving east at 15 mph.
Winds in excess of 30 mph will be possible with this storm.
Locations impacted include...
Jasonville, Shelburn, Prairieton, Prairie Creek, Farmersburg, Hymera,
Fairbanks, Coalmont and Pimento.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 3921 8758 3924 8758 3925 8757 3926 8758
3925 8759 3934 8756 3935 8754 3935 8753
3937 8753 3939 8721 3917 8718 3917 8762
TIME...MOT...LOC 2332Z 271DEG 15KT 3929 8760
DWMSpecial Weather Statement
National Weather Service Indianapolis IN
803 PM EDT SAT JUL 22 2017
INZ051>054-060-062-230045-
Owen IN-Clay IN-Morgan IN-Vigo IN-Sullivan IN-Monroe IN-
803 PM EDT SAT JUL 22 2017
...SPECIAL WEATHER STATEMENT...
At 802 PM EDT, Doppler radar was tracking a strong thunderstorm 12
miles north of Sullivan, or 13 miles south of Terre Haute, moving
east at 25 mph.
Winds in excess of 30 mph will be possible with this storm.
Locations impacted include...
Bloomington, Spencer, Ellettsville, Shelburn, Prairieton, Prairie
Creek, Farmersburg, Clay City, Gosport, Hymera, Fairbanks, Paragon,
Stinesville, Coal City, Indiana University, Bowling Green, McCormicks
Creek State Park, Freedom, Patricksburg and Coalmont.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also possible with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3922 8757 3924 8758 3938 8753 3940 8649
3913 8650 3914 8668 3917 8668 3917 8718
3919 8760
TIME...MOT...LOC 0002Z 271DEG 22KT 3927 8740
DWMThe Indianapolis radar (KIND), 102 km away, was scanning. The volume nearest the first event began at 00:38 UTC.
1 thunderstorm wind. Local standard time, as filed.
Multiple trees were downed across Shakamak State Park 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: 714075.