A couple different waves of showers and thunderstorms moved northeast during the early morning and late morning/early afternoon of September the 25th. This multiple rounds of rain produced flooding to the northwest of Indianapolis.
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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 couple different waves of showers and thunderstorms moved northeast during the early morning and late morning/early afternoon of September the 25th. This multiple rounds of rain produced flooding to the northwest of Indianapolis.
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 25, 9:50 AM EST, 1 hour 13 minutes earlier.
Area Forecast Discussion National Weather Service Indianapolis IN 1050 AM EDT Tue Sep 25 2018 .UPDATE... The Near Term and AVIATION Sections have been updated below. && .SYNOPSIS... Issued at 257 AM EDT Tue Sep 25 2018 Showers and thunderstorms will move across central Indiana at times through tonight along and ahead of a cold front. Severe storms are possible. Dry conditions will then return for mid-week into next weekend as the area remains in between systems. Another front will bring more rain chances early next week. For much of the next week, temperatures will generally be near normal to below normal. && .NEAR TERM...(Rest of Today) Issued at 1050 AM EDT Tue Sep 25 2018 For the update...Rain and storms overnight and this morning across the southern portion of the forecast area and cloud cover remaining in tact over that area through the day prompted a drop from slight to marginal risk for this area for severe weather today. Heavy rainfall still a threat with high precipitable water values. North of 70 may still retain higher threat with proximity to jet and the warm front and will bear watching, but storms moving through that area now could also muddle up the atmosphere and inhibit severe convection later due to lack of instability. Increased pops through the morning to categorical at some point in the morning/early afternoon to most locations across the area based on radar coverage and high resolution output. This output continues to show a break in rainfall at some point during the afternoon, but then some development this evening. Made no changes to temperatures with cloud cover still expected to rule for most of the day (albeit with some brief breaks). Previous discussion follows... Precipitable water values will remain in the 1.5 to 2 inch range, which is quite high for this time of year. Thus locally heavy rain will be a threat. There is decent shear across the area today, but the question for severe storms will depend on how much instability can build this afternoon. Clouds will be hanging around for most of the day, and feel this will help keep instability mostly in check. Even so, some severe storms are possible per the Storm Prediction Center's Day 1 Outlook. The primary threat would be damaging winds for most areas. However, there may be a tornado threat across the northern forecast area closer to an old warm front. This will also be dependent on instability development. The timing of the severe storm potential looks to be later this afternoon into the evening. Temperatures will depend on cloud cover. For now stuck with the blend's temperatures in the mid 70s to around 80. If some sun does break through, these will be too cool. && .SHORT TERM...(Tonight through Thursday night) Issued at 257 AM EDT Tue Sep 25 2018 Models are close enough that the model blend initialization was accepted for most items. The cold front will move through central Indiana tonight. The severe storm threat mentioned in the Near Term section above will continue into the evening, with the same caveats about instability. For the overnight instability will be waning, so the severe threat will do the same. Will continue with likely PoPs for many areas at some point during the night as the front moves through. Kept some slight chance PoPs across the extreme east Wednesday morning. Otherwise went dry with drier air quickly moving in behind the cold front. High pressure will then influence the area for the remainder of the period, keeping the area cool and dry. && .LONG TERM /Friday through Monday Night/... Issued at 343 AM EDT Tue Sep 25 2018 The majority of the long term period will be dry with normal/slightly below normal temperatures. High pressure centered over the Ohio and Tennessee Valleys will persist into the weekend. It won't be until Sunday evening when low chance pops enter the forecast with a warm front from the southwest. This front will increase high temperatures back into the upper 70s/low 80s for Monday. Pops will also increase to likely by Monday night as a cold front interacts with the warm and humid environment. Latest blended initialization came in rather high with pops on Monday night/Tuesday, but agree with them due to the setup. So, no changes were made. && .AVIATION /Discussion for the 25/15Z TAF Issuance/... Issued at 1050 AM EDT Tue Sep 25 2018 Did some earlier updates to include tempo group for showers/thunderstorms based on radar trends and high resolution model output. Added some wind gusts with these tempo groups as well as some reduced visibilities. Previous discussion follows... IFR/MVFR conditions can be expected for most of the morning and afternoon period, leaning more toward the IFR this morning as the first round of showers and thunderstorms with a warm front move through central Indiana. There could be some brief improvement to VFR this afternoon with a lull ahead of an approaching cold front, but that is optimistic. That cold front is then expected to start triggering showers and possible severe thunderstorms this afternoon and evening. There could be quick deterioration to IFR/LIFR in any storms that do form. Tonight, lingering low level moisture should result in MVFR ceilings. Meanwhile, winds through the period will start out southerly, then slowly veering to the northwest through the course of the period with frontal passage. && .IND WATCHES/WARNINGS/ADVISORIES...NONE. && SYNOPSIS...50 NEAR TERM...50/CP SHORT TERM...50 LONG TERM....TDUD AVIATION...TDUD/CP
Hazardous Weather Outlook National Weather Service Indianapolis IN 400 AM EDT Tue Sep 25 2018 INZ021-028>031-035>049-051>057-060>065-067>072-260800- 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 400 AM EDT Tue Sep 25 2018 This hazardous weather outlook is for central Indiana. .DAY ONE...Today and Tonight. Outlook: Thunderstorms will move across the area today and tonight. Some may be severe. Hazards: Damaging winds, isolated tornadoes, locally heavy rain and flooding, hail, lightning. Timing: While thunderstorms are possible anytime today and tonight, the highest chances for severe storms will be mid afternoon into the evening. Discussion: Thunderstorms will continue to develop along and ahead of a cold front. The front will move through central Indiana tonight. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Outlook: Thunderstorms are possible on Monday. Discussion: Quiet weather will continue into the weekend, then a cold front will bring another chance for thunderstorms early next week. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon into the evening. && 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 1101 AM EDT TUE SEP 25 2018 INZ030-036-037-251530- Montgomery IN-Clinton IN-Boone IN- 1101 AM EDT TUE SEP 25 2018 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN CLINTON...BOONE AND NORTHEASTERN MONTGOMERY COUNTIES UNTIL 1130 AM EDT... At 1101 AM EDT, Doppler radar was tracking a strong thunderstorm 10 miles west of Lebanon, or 12 miles east of Crawfordsville, moving east at 40 mph. Wind gusts up to 50 mph will be possible with this storm. Locations impacted include... Lebanon, Thorntown, Kirklin, Colfax, Advance and Ulen. LAT...LON 3999 8676 4019 8674 4029 8625 4001 8625 TIME...MOT...LOC 1501Z 254DEG 34KT 4007 8666 AW/CP
The national radar mosaic for the moment the first event began.
4 flood. Local standard time, as filed.
Heavy rainfall produced water over the road in low-lying areas on County Road 350 North and State Road 75.
The 911 Center reported standing water near the intersection of State Road 75 and County Road 200 North due to heavy rainfall.
The 911 Center reported standing water near the intersection of State Road 29 and County Road 800 North.
Flooding was reported at Rocky Ridge Golf Club due to heavy rainfall. This report was relayed via broadcast media.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2018Every state in 2018This day in weather historyWarnings in Indiana, September 2018
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: 784346, 784354, 784355, 784356.