A warm front lifted north out of the central plains and into Ohio on April 3 with a trailing area of low pressure over Michigan. Morning showers on April 3rd brought an inch or two of rain to southern portions of the area over the Ohio River drainage basin. Later that afternoon and evening thunderstorms moved over these same already saturated areas. This additional heavy rain resulted in rapid runoff and flooding despite rainfall totals of an inch or less. Another round of showers occurred on April 4th. The heaviest rain fell over a line from Marion to Holmes counties with one to three inches of rain reported. This rain, over saturated ground cover resulted in rapid runoff. There were numerous road closures due to flooding and even a few water rescues. The Killbuck Creek reached moderate flood stage and several others reached minor. Several other rivers reached minor flood stage.

Flood in KNOX, OHIO
From 03-APR-18 16:40:00 to 04-APR-18 15:30:00 (EST-5)
Location: WATERFORD
Flood cause: Heavy Rain
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Multiple rounds of heavy rain moved over Knox County on April 3 and 4th.  Rainfall measured for these two days was 2.5 to 3.5 inches with locally higher amounts. The rainfall resulted in multiple closed roads across the county. The hardest hit areas were in northern Knox County in the Fredericktown where the heaviest rain fell. A water rescue occurred on Knox Lake Road between SR 95 and Mishey Road from the Markey Run, a tributary to Knox Lake around 1020 pm on the 3rd. A vehicle was stuck in flood waters on Kildruff Road by Kokosing River in Gambier as early as 740 PM on the 3rd. This flood prone location remained flooded well into the 4th.

Flood in MORROW, OHIO
From 03-APR-18 19:00:00 to 04-APR-18 15:00:00 (EST-5)
Location: EDISON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Heavy rain on April 3 and 4 measuring 2 to 3 inches resulted in numerous flooded roads across the Morrow County including the closures of RT 28,217, 126, 25, 61, 42, 172, 173.  Flooding also occurred along the Whetstone Creek near Mount Gilead.

Flood in RICHLAND, OHIO
From 04-APR-18 02:00:00 to 04-APR-18 14:00:00 (EST-5)
Location: BELLVILLE BENDER ARP
Flood cause: Heavy Rain
Property damage: 4.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Multiple roads flooded from multiple days of heavy rain over the region. Rainfall over southern Richland County from Mansfield southward was measured at 0.75-1 on April 3, and 1.50-2.0 on April 4th. The accumulation of this rainfall cause area streams and creeks to floods including tributaries to the Mohican River.

Flood in ASHLAND, OHIO
From 04-APR-18 02:00:00 to 04-APR-18 14:00:00 (EST-5)
Location: JEROMESVILLE
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Several roads flooded across the southern portions of the county on April 4. Rainfall amounts over southern Ashland County was around 1 to 2 inches. However, heavier rainfall amounts fell in the headwaters of the Mohican River in Richland County where observers measured closer to 3 inches of rain. The Black Fork Mohican River at Loudonville came out of banks on April 4th flooding numerous campgrounds and recreational areas. Due to the seasonal variability of the population, the impacts were limited. The Jerome Fork and Glenn Run creeks flooded portions of CR 1950. The most notable damage occurred in Jeromesville on County Road 1950 just east of CR 175 were a large section of a road bank was eroded.