A northeast to southwest oriented band of showers and thunderstorms pushed east southeast through northern portions of central Indiana during the evening hours of September the 4th. A couple storms within the band produced damaging wind and small hail.
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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 northeast to southwest oriented band of showers and thunderstorms pushed east southeast through northern portions of central Indiana during the evening hours of September the 4th. A couple storms within the band produced damaging wind and small hail.
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 Sep 4, 5:43 PM EST, 42 minutes earlier.
Area Forecast Discussion National Weather Service Indianapolis IN 643 PM EDT Mon Sep 4 2017 .UPDATE... The AVIATION section has been updated below. && .SYNOPSIS... Issued at 234 PM EDT Mon Sep 4 2017 A strong cold front moving through central Indiana will bring showers and thunderstorms, some which could be severe, to the area this evening and tonight. After that the area should see off and on rain showers with upper energy spokes rotating through an upper trough over the Great Lakes. High pressure will build in as the upper trough moves off to the east by the end of the week. Temperatures will run below normal from Tuesday onward. && .NEAR TERM /This evening and tonight/... Issued at 234 PM EDT Mon Sep 4 2017 A strong cold front entering from the northwest this evening will bring a line of thunderstorms to central Indiana. Instability is increasing across the area as temperatures have climbed to the mid and upper 80s with dewpoints in the upper 60s as of 230 pm. High resolution models show arrival of the convective line around 7 pm in the northwest, 9 pm central, and 11 pm in the southeast. Enhanced risk for severe continues over the northern half or so of the area. While large hail and isolated tornadoes are still listed as possible threats, think they are less likely given the lack of cold air aloft for hail, and lack of strong low level shear and low LCLs for tornadoes. Think the most likely threat given the above and the linear mode expected would be damaging winds. Should see weakening in the line as it moves into the southeastern counties with instability dropping off by that point. Chances for showers and some lower clouds will hang around in the wake of the cold front for a few hours. Low temperatures in northwestern counties will drop into the mid 50s with clearing skies but in the southeast with more cloud cover should remain in the low to mid 60s. && .SHORT TERM /Tuesday through Thursday/... Issued at 234 PM EDT Mon Sep 4 2017 Cool air will be advecting in Tuesday in the wake of the cold frontal passage. Skies should clear during the night, but then will see them fill back in during the day Wednesday as an upper wave moves through the upper trough, interacting with moisture and warm air from the Great Lakes. The cooler air aloft will allow for destabilization and the formation of clouds and scattered showers, with the highest chances in the north and northeast, tapering to lesser chances to the southwest. These will dissipate with loss of heating Wednesday evening. Thursday will be very similar to Wednesday with its similar set up, thus look again for increasing clouds and scattered showers in the afternoon with highs in the mid 60s to low 70s. Instability showers should be fairly shallow so will leave thunder out at this point. && .LONG TERM /Friday Night through Monday/... Issued at 232 PM EDT Mon Sep 4 2017 ECMWF shows strong ridging with subsidence in place across Indiana and the Ohio valley through next weekend. Furthermore...the ECMWF suggests very large high pressure remaining in place at the surface through the period stretching from the eastern Great Lakes to the Central Mississippi Valley. Thus will continue with a dry forecast...mostly clear nights...partly cloudy days and temperatures below seasonal normals. && .AVIATION (Discussion for the 050000Z TAF Issuance)... Issued at 643 PM EDT Mon Sep 4 2017 MVFR/IFR conditions in convection during the first few hours of the TAF period, then VFR conditions expected. A line of convection will move through the area during the first few hours of the TAF period. Some of the storms may be severe with gusts of 50kt. MVFR/IFR conditions are possible in the convection. Afterward drier air will gradually work into the area and will erode lingering clouds. Winds will become northwest behind the convection and will continue into Tuesday. && .IND WATCHES/WARNINGS/ADVISORIES... NONE. && SYNOPSIS...CP NEAR TERM...CP SHORT TERM...CP LONG TERM....Puma AVIATION...50
Hazardous Weather Outlook National Weather Service Indianapolis IN 558 PM EDT Mon Sep 4 2017 INZ021-028>031-035>049-051>057-060>065-067>072-052200- 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 558 PM EDT Mon Sep 4 2017 This hazardous weather outlook is for central Indiana. .DAY ONE...Tonight. Outlook: Thunderstorms are expected, some of which will be severe. HAZARDS: Isolated tornadoes, damaging winds, frequent lightning, large hail, and heavy downpours. TIMING: Now through 2 AM. Discussion: Showers and thunderstorms will form along and ahead of a cold front. Some of the storms could become severe at times. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Outlook: No hazardous weather is expected at this time. Discussion: An upper low could generate rain showers at times on Wednesday and Thursday. .SPOTTER INFORMATION STATEMENT... Spotter activation will be needed this evening. && More information, along with other weather, hydrological and climate information can be found at http://weather.gov/ind
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
722 PM EDT MON SEP 4 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0704 PM TSTM WND GST 3 SSE DELPHI 40.54N 86.65W
09/04/2017 M56 MPH CARROLL IN TRAINED SPOTTER
MEASURED WITH MOBILE WEATHER STATION.
RELAYED VIA AMATEUR RADIO.
&&
AWThe Indianapolis radar (KIND), 87 km away, was scanning. The volume nearest the first event began at 23:22 UTC.
2 thunderstorm wind, 1 hail. Local standard time, as filed.
A tree was reported down across County Road 1250 West due to damaging thunderstorm wind gusts. Report was relayed via Twitter.
An estimated 60 mph thunderstorm wind gust was observed in this location.
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, September 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: 722290, 722289, 722291.