Isolated showers and thunderstorms developed in an unstable air mass during the late afternoon hours. The storms were slow moving and produced locally heavy rainfall.
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The episode as NWS ILN wrote it up.
Isolated showers and thunderstorms developed in an unstable air mass during the late afternoon hours. The storms were slow moving and produced locally heavy rainfall.
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 Wilmington, OH wrote its last area forecast discussion before the first event at Jul 23, 2:04 PM EST, 4 hours 26 minutes earlier.
Area Forecast Discussion National Weather Service Wilmington OH 304 PM EDT Mon Jul 23 2018 .SYNOPSIS... An upper level low pressure system will result in a chance of showers and a few thunderstorms on Tuesday. Temperatures will slowly moderate to more normal daytime readings through mid week. However, a weak cold front moving through the region on Thursday will bring a return to slightly below normal temperatures heading into the weekend. && .NEAR TERM /THROUGH TONIGHT/... A narrow axis of showers associated with a low level deformation axis has been making a steady but slow westward push across central portions of our FA this afternoon. Meanwhile, isolated to scattered showers and thunderstorms have developed behind this axis across eastern portions of our fa, where the airmass is somewhat more unstable. The axis of showers is moving into a slightly drier airmass, so do expect to see a gradual weakening trend with this. Otherwise, with a decent diurnal component to the showers and isolated thunderstorms, would expect to see a decreasing trend in coverage as we head through this evening. Lows tonight will be mainly in the mid 60s. && .SHORT TERM /TUESDAY THROUGH TUESDAY NIGHT/... The upper level trough will slowly shift eastward Tuesday into Tuesday night, leaving a stretched out low level/surface boundary across eastern portions of our fa. As we start to get into some daytime heating and destabilize, expect to see scattered shower and thunderstorm development along the convergent axis associated with the boundary. This should lead to a decent chance of showers and thunderstorms across our far eastern areas, where will allow for some likely pops Tuesday afternoon. Will then trim back to chance pops across our central areas and just a slight chance across our west. As we start to lose the diurnal enhancement, we should once again see a decreasing trend in coverage as we head into Tuesday night. Highs on Tuesday will generally be in the lower 80s. && .LONG TERM /WEDNESDAY THROUGH MONDAY/... Broad upper trough and associated short waves will dictate weather conditions for this period. For Wednesday, most short wave energy and moisture will lie to the east according to latest model runs, so went with a slight chance of showers and thunderstorms in eastern counties, while western locations have a dry forecast. A weakening cold front with little upper support may bring a few thunderstorms to northern sites on Thursday as the front sags south from the Great Lakes. Additional thunderstorms will be possible Friday as the front continues its slow southward progress. Saturday should see dry weather as weak surface high pressure builds under the increasingly zonal flow around the base of the broad upper trough. The next system to produce widespread precipitation may arrive Sunday and Monday when a surface low is forecast to develop ahead of a more potent batch of short wave energy emerging to the west. Went as high as likely pops for this rather prolonged event. Temperatures starting in the near normal mid 80s with retreat below normal to the upper 70s and lower 80s under clouds, precip, and modest cold advection. && .AVIATION /19Z MONDAY THROUGH SATURDAY/... A narrow axis of light rain showers is shifting slowly west toward the I-75 corridor. This area of pcpn is expected to slowly weaken, but it may affect the western TAF sites over the next hour or two. Meanwhile further east, isolated to scattered showers and thunderstorms have developed in a more unstable airmass. The main threat for these will be at the central Ohio TAF sites over the next few hours. Cigs have been gradually improving although some MVFR to locally IFR cigs are persisting across the area early this afternoon. Cigs should eventually lift up to VFR across the entire area as we head through late afternoon. Some lingering low level moisture will likely lead to a redevelopment of some mainly MVFR cigs later tonight into Tuesday morning. We could also see some areas of MVFR BR develop late tonight. Cigs should gradually improve later Tuesday morning and into Tuesday afternoon. OUTLOOK...Thunderstorms will be possible at times, mainly during the afternoon and evening, Tuesday and again on Thursday. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && SYNOPSIS...JGL NEAR TERM...JGL SHORT TERM...JGL LONG TERM...Coniglio AVIATION...JGL
Hazardous Weather Outlook National Weather Service Wilmington OH 410 AM EDT Mon Jul 23 2018 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046- 051>056-060>065-070>074-077>082-088-241200- Wayne-Fayette IN-Union IN-Franklin IN-Ripley-Dearborn-Ohio- Switzerland-Carroll-Gallatin-Boone-Kenton-Campbell-Owen-Grant- Pendleton-Bracken-Robertson-Mason-Lewis-Hardin-Mercer-Auglaize-Darke- Shelby-Logan-Union OH-Delaware-Miami-Champaign-Clark-Madison- Franklin OH-Licking-Preble-Montgomery-Greene-Fayette OH-Pickaway- Fairfield-Butler-Warren-Clinton-Ross-Hocking-Hamilton-Clermont-Brown- Highland-Adams-Pike-Scioto- 410 AM EDT Mon Jul 23 2018 This Hazardous Weather Outlook is for East Central Indiana, Southeast Indiana, Northeast Kentucky, Northern Kentucky, Central Ohio, South Central Ohio, Southwest Ohio and West Central Ohio. .DAY ONE...Today and Tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement
National Weather Service Wilmington OH
504 PM EDT MON JUL 23 2018
OHZ056-232130-
Licking OH-
504 PM EDT MON JUL 23 2018
...A STRONG THUNDERSTORM WILL AFFECT SOUTH CENTRAL LICKING COUNTY
UNTIL 530 PM EDT...
At 504 PM EDT, radar indicated a strong thunderstorm over Hebron,
moving north at 20 mph.
STORM HAZARDS INCLUDE...
Winds to 40 mph...
One half inch diameter hail...
Very heavy rain...
Locations impacted include...
Newark, Heath, Granville, Buckeye Lake, Hebron, Granville South and
Harbor Hills.
This includes I-70 in Ohio between mile markers 127 and 131.
Water will pond on roads and may quickly fill roadside ditches and
small streams.
To report hazardous weather conditions, go to our website at
weather.gov/iln and submit your report via social media, when you can
do so safely.
LAT...LON 3995 8242 3994 8246 3994 8252 4013 8262
4015 8243
TIME...MOT...LOC 2104Z 175DEG 16KT 3999 8248
JDRThe national radar mosaic for the moment the first event began.
3 flood. Local standard time, as filed.
Widespread street flooding was reported in Gahanna.
The intersection of Livingston Avenue and Kenwick Road was submerged in water.
High water was reported near the intersection of Broadview Road and North Hamilton Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2018Every state in 2018This day in weather historyWarnings in Ohio, July 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: 759633, 759634, 759635.