A bowing line of thunderstorms pushed east into southwest portions of central Indiana during the morning of the 23rd of July. Some additional scattered storms had developed ahead of the line.
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 IND wrote it up.
A bowing line of thunderstorms pushed east into southwest portions of central Indiana during the morning of the 23rd of July. Some additional scattered storms had developed ahead of the line. Damaging wind gust accompanied the line and flash flooding was noted in Martin County where rain had impacted the area numerous times.
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 23, 5:51 AM EST, 9 minutes earlier.
Area Forecast Discussion National Weather Service Indianapolis IN 651 AM EDT Sun Jul 23 2017 .UPDATE... The AVIATION Section has been updated below. && .SYNOPSIS... Issued at 332 AM EDT Sun Jul 23 2017 One more day with very humid conditions is expected today before a cold front sweeps through the area tonight. A chance of thunderstorms will exist later today into this evening ahead of the front. High pressure will build in Monday bringing dry...cooler and less humid air to central Indiana through the first half of the week. Rain and thunderstorms return Thursday as another cold front passes through the area before dry weather returns to the Ohio Valley for next weekend. && .NEAR TERM /Today/... Issued at 332 AM EDT Sun Jul 23 2017 Another active early morning across parts of the region as convective clusters track along an old outflow boundary across southern portions of the forecast area. 07Z temperatures remained in the 70s across central Indiana. Lower confidence forecast for today than it originally appeared just 24 hours ago as the tropical moisture lingers well north of the current convection early this morning...extending all the way back into the Great Lakes. Frontal boundary extending across central Indiana and Illinois appears to be losing its characteristics rapidly. Growing sense that the oppressive conditions of recent days will not be pushed out of the area until a secondary front located over the upper Midwest this morning swings through the region tonight. Initially...focus is on the convective cluster drifting southeast across southern portions of the forecast area. Most of the thunderstorms fired off an old outflow boundary from the early Saturday morning storms that roughly settled in an axis from near KHUF southeast into northern Kentucky. These storms have been subsevere...but have produced a few inches of rainfall in an arc from southern Vigo into western Lawrence County. Convection is steadily moving towards the more unstable airmass present over central and northern Kentucky...and expect most of these storms to move out of southern counties prior to 12Z. Will have to keep an eye on yet another convective cluster quickly approaching KSTL early this morning. These storms should continue to weaken as they move into a more stable environment present over southern Illinois and Indiana...but will likely need to keep a low chance pop in the far south for a few hours beyond daybreak. High uncertainty for the rest of today as upper wave approaches later today with the secondary cold front. As both of these features interact with the warm and unstable airmass over the region... potential is there for isolated to scattered storms to develop. Remnant outflow boundaries from storms last evening into this morning may also aid in development. Soundings indicate a weakly capped airmass initially but as temperatures warm...should see MLCAPES peak near 2000j/kg. Storms will be reliant on instability and moisture with the forcing associated with the upper wave as poor lapse rates and weaker flow through the boundary layer should work against more widespread development. Overall...think storms largely remain subsevere but WBZERO values dropping below 10kft with mid level heights falling would support more of a large hail threat in stronger cells than in recent days. Damaging wind gusts will be possible too. Will place highest pops over the northeast half of the forecast area in closer proximity to the energy associated with the upper wave. Temps...Low level thermals supported a model blend with highs in the upper 80s and lower 90s. Dewpoints will remain in the 70s which will make for one more humid day. Max heat indices should largely stay below 100 degrees with the exception of the lower Wabash Valley. && .SHORT TERM /Tonight through Tuesday Night/... Issued at 332 AM EDT Sun Jul 23 2017 Forecast challenges focus on precip chances tonight before high pressure takes over with cooler and less humid air finally arriving. Any scattered convection with the secondary front this evening will likely be ongoing at 00Z. Storms should diminish in coverage and intensity by late evening with loss of diurnal heating and as the upper wave shifts east of the region. Will maintain low chance pops through 06Z then go dry. The frontal boundary will sag to near the Ohio River by early Monday morning...continuing further south on Monday into the Tennessee Valley. High pressure will expand south from the Great Lakes and finally advect a more refreshing airmass into central Indiana. The high will serve as the dominant influence on weather across the region for the remainder of the short term as it tracks east across the Great Lakes. Cu remain possible during the afternoons but overall cloud coverage will be low as model soundings show capped mid levels and plenty of dry air and subsidence present aloft. Temps...more seasonable temperatures will return through the period as highs fall back into the low and mid 80s with lows in the 60s. Maybe most importantly...the very high dewpoint air will be forced south with the front tonight and Monday and will not return through Tuesday night as dry low level flow from the north and east persists. Overall forecast confidence is high after tonight. && .LONG TERM /Wednesday through Saturday/... Issued at 215 AM EDT Sun Jul 23 2017 This is a high confidence forecast. Temperature errors should mostly be 2 degrees or less. POP errors should be mostly 10 percent or less. Wind in the upper atmosphere are going to remain unusually strong for this time of year, producing well defined weather systems that are relatively easy to forecast. The American and European systems are in good agreement, suggesting they are on the right track. && .AVIATION (Discussion for 231200Z TAFs)... Issued at 651 AM EDT Sun Jul 23 2017 Thunderstorms are possible today and early tonight, but should avoid the northern sites until at least 16Z. VLIFR and strong winds are possible in storms, but will be of short duration at any given site. The TAFs in this package can capture this only in very general terms and may be updated frequently. Otherwise, expect VFR with ceilings around 5 thousand feet today and 10 thousand feet or better tonight. Winds will become northwest less than 10 knots today, then light and variable tonight. && .IND WATCHES/WARNINGS/ADVISORIES... NONE. && SYNOPSIS...Ryan NEAR TERM...Ryan SHORT TERM...Ryan LONG TERM....JK AVIATION...JK
Hazardous Weather Outlook National Weather Service Indianapolis IN 353 AM EDT Sun Jul 23 2017 INZ021-028>031-035>049-051>057-060>065-067>072-241000- Carroll-Warren-Tippecanoe-Clinton-Howard-Fountain-Montgomery-Boone- Tipton-Hamilton-Madison-Delaware-Randolph-Vermillion-Parke-Putnam- Hendricks-Marion-Hancock-Henry-Vigo-Clay-Owen-Morgan-Johnson-Shelby- Rush-Sullivan-Greene-Monroe-Brown-Bartholomew-Decatur-Knox-Daviess- Martin-Lawrence-Jackson-Jennings- Including the cities of Lafayette, Frankfort, Kokomo, Crawfordsville, Anderson, Muncie, Indianapolis, Terre Haute, Shelbyville, Bloomington, Columbus, Vincennes, Bedford, and Seymour 353 AM EDT Sun Jul 23 2017 This hazardous weather outlook is for central Indiana. .DAY ONE...Today and Tonight. Outlook: There is a threat for scattered strong thunderstorms... especially this afternoon and evening. An isolated severe storm is possible as well. Hazards: Damaging winds, large hail, heavy rain and localized flooding, along with dangerous lightning. Max heat indices will be between 100 and 102 degrees over the lower Wabash Valley. Timing: Best chances for storms will be this afternoon and evening. Heat indices will peak during the afternoon. Discussion: A secondary cold front dropping south from the Great Lakes may spark scattered thunderstorms this afternoon and evening with a warm and unstable airmass across central Indiana. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Outlook: Scattered thunderstorms will be possible Wednesday night through Thursday night. Storms may produce gusty winds...heavy rainfall and lightning. Discussion: After high pressure provides dry and less humid conditions for the first half of the week...thunderstorms will return on Wednesday night and continue through Thursday as a cold front moves across the region. .SPOTTER INFORMATION STATEMENT... Spotter activation is possible this afternoon and evening. && More information, along with other weather, hydrological and climate information can be found at http://weather.gov/ind Ryan
Special Weather Statement
National Weather Service Indianapolis IN
125 AM EDT SUN JUL 23 2017
INZ051>053-060-061-230615-
Owen IN-Clay IN-Greene IN-Vigo IN-Sullivan IN-
125 AM EDT SUN JUL 23 2017
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN VIGO...NORTHEASTERN
SULLIVAN...SOUTHWESTERN CLAY...SOUTHWESTERN OWEN AND NORTHWESTERN
GREENE COUNTIES UNTIL 215 AM EDT...
At 125 AM EDT, Doppler radar was tracking a strong thunderstorm 10
miles northeast of West Union, or 11 miles southeast of Marshall,
moving east at 50 mph.
Dime size hail and wind gusts up to 50 mph will be possible with this
storm.
Locations impacted include...
Bloomfield, Jasonville, Worthington, Shelburn, Prairieton, Prairie
Creek, Farmersburg, Clay City, Hymera, Fairbanks, Switz City, Coal
City, Freedom, Coalmont, Pimento and Vicksburg.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
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.
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 3934 8758 3934 8756 3935 8753 3940 8753
3923 8685 3899 8693 3923 8758 3925 8757
3926 8758 3925 8760 3927 8760 3928 8761
3930 8760 3931 8761
TIME...MOT...LOC 0525Z 290DEG 42KT 3931 8751
RyanSpecial Weather Statement
National Weather Service Indianapolis IN
138 AM EDT SUN JUL 23 2017
INZ067-230630-
Knox IN-
138 AM EDT SUN JUL 23 2017
...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL KNOX COUNTY UNTIL 230 AM
EDT...
At 137 AM EDT, Doppler radar was tracking a strong thunderstorm near
Lawrenceville, moving east at 35 mph.
Wind gusts up to 50 mph will be possible with this storm.
Locations impacted include...
Vincennes, Monroe City, Wheatland, Decker and Vincennes University.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
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.
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 3859 8764 3859 8761 3861 8763 3864 8762
3867 8759 3869 8753 3875 8750 3870 8727
3869 8728 3867 8726 3868 8725 3855 8724
3851 8730 3854 8735 3854 8737 3851 8737
3854 8738 3853 8748 3851 8748 3854 8767
TIME...MOT...LOC 0537Z 277DEG 29KT 3866 8776
RyanThe Evansville,IN radar (KVWX), 50 km away, was scanning. The volume nearest the first event began at 10:58 UTC.
2 thunderstorm wind, 1 flash flood. Local standard time, as filed.
A large tree was downed near the intersection of 3rd Street and Shelby Street in Vincennes due to damaging thunderstorm wind gusts.
A tree was downed near Old US 50 Highway and Hyde Park Drive due to damaging thunderstorm wind gusts.
Numerous roads were flooded in Loogootee due to heavy thunderstorm rainfall. Several roads were closed due to water flowing over them.
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: 717113, 717114, 717115.