A very slow moving and isolated thunderstorm dumped a copious amount of rain over a localized area that led to some water over a road in Knox County.
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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 very slow moving and isolated thunderstorm dumped a copious amount of rain over a localized area that led to some water over a road in Knox County.
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 May 16, 12:48 PM EST, 1 hour 40 minutes earlier.
Area Forecast Discussion National Weather Service Indianapolis IN 148 PM EDT Wed May 16 2018 .UPDATE... The LONG TERM Section has been updated below. && .SYNOPSIS... Issued at 345 AM EDT Wed May 16 2018 Periodic chances for showers and storms and largely above normal temperatures remain in the forecast as an active summer like pattern continues across central Indiana. && .NEAR TERM /Today/... Issued at 345 AM EDT Wed May 16 2018 The quasistationary front has drifted down to near the Ohio River in the last 24 hours or so and will likely remain in the region today as weak waves move along the boundary. This will continue to necessitate low chances for storms mainly across central and southern portions of the area today, with chances maximized nearest the boundary across the south at peak heating this afternoon. Severe storms are not expected. Consensus temperatures generally appeared reasonable and were accepted with only minor tweaks. Should see cooler but still above normal readings across central Indiana today. && .SHORT TERM /Tonight through Friday Night/... Issued at 345 AM EDT Wed May 16 2018 Will continue to need low chances for storms across the far south tonight as the boundary lingers and a messy and subtle convective environment remains. Chances will drift back northward and increase gradually Thursday into Friday as a closed upper level low slowly pushes into the region. This will likely be in the form of showers with some embedded thunder at times. Consensus temperatures were acceptable and only required minor tweaks. Coolest day of the forecast will likely be Friday with the upper low directly overhead. && .LONG TERM (Saturday night through Wednesday)... Issued at 149 PM EDT Wed May 16 2018 Forecast confidence is generally high. There is more uncertainty Monday than at other times. Mostly the models agree well. The exception is Monday when the European system is cooler for Indiana than the GFS. Because of this, potential forecast errors are 1-3 degrees most times, but up to 5 degrees Monday. The models concur about a chance of rain most of the period as a front lingers near the Hoosier State. Really definite rain forecasts for a given time may not be possible more than a day in advance. && .AVIATION /Discussion for the 16/1800z TAF Issuance/... Issued at 122 PM EDT Wed May 16 2018 Some borderline VFR/MVFR CU has developed across portions of central Indiana...mainly affecting IND/HUF/BMG. Expect these ceilings to rise slightly as we go deeper into the afternoon. Utilized a TEMPO to account for the potential movement of ceilings into separate nearby categories. Otherwise...convection near BMG may dip ceilings and vsbys into the MVFR realm...potentially IFR/LIFR if a stronger storm with heavier rainfall develops overhead. Dry conditions are expected over the other TAF sites. Winds remain generally out of the northeast at less than 10 kts. Expect this trend to continue into tonight and Thursday. && .IND WATCHES/WARNINGS/ADVISORIES... NONE. && SYNOPSIS...Nield NEAR TERM...Nield SHORT TERM...Nield LONG TERM....JK AVIATION...MRD
Hazardous Weather Outlook National Weather Service Indianapolis IN 506 AM EDT Wed May 16 2018 INZ021-028>031-035>049-051>057-060>065-067>072-170915- 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 506 AM EDT Wed May 16 2018 This hazardous weather outlook is for central Indiana. .DAY ONE...Today and Tonight. Outlook: Isolated thunderstorms over southern portions of central Indiana. Hazards: Lightning and brief heavy rainfall. Timing: This afternoon and evening Discussion: A few thunderstorms are possible this afternoon across the southern portions of central Indiana. Severe weather is not expected today or tonight. Primary hazard will be lightning and brief heavy rainfall. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Outlook: There will be chances for rain and thunderstorms every day across central Indiana, but severe weather is not expected. Frequent lightning and heavy rain are the main threats. Discussion: A nearly stationary boundary will slowly meander across the state through the rest of the week into the weekend bringing chances for rain showers and thunderstorms. A frontal system is expected to move through late Sunday into Monday bringing additional chances for rain and thunderstorms. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated && More information, along with other weather, hydrological and climate information can be found at http://weather.gov/ind
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Water was reported to be over State Road 550 near Pierce Road due to heavy thunderstorm rainfall.
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, May 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: 762488.