Flood concerns for Monday

Heavy and persistent rain expected
Posted at 5:42 PM, Dec 15, 2019
and last updated 2019-12-15 17:43:21-05

The second storm in sequence has already made a mess of things in Southern Indiana as snowfall pushes north with the warm front. We had mostly cloud coverage here, but a few rain and even mix showers lined up over the northern counties. This is just a taste of things to come.

The next feature of the storm will be persistent and heavy rainfall. The center of low pressure will slide over the state ramping up energy for us. This means we get a few thunderstorms embedded in the rain shield. As the front settles overhead, there will be a slight “stall.” Therefore, the showers will take on a mostly linear shape stretching from the southwest to the northeast. This line of showers will continue to pump in moisture starting early Monday and last through the day.

The line will not be wide enough to cover the entire state. Expect the heaviest of rain over the Bluegrass counties in the early morning. As the front slides southeast, southern and southeastern counties will be “stuck” under the arm of rain through the afternoon and evening.

The heavy and persistent rainfall in the south and southeastern counties will likely lead to some high-water scenarios and possibly to flooding. The National Weather Service has already issued a FLOOD WATCH for these locations which will run from Monday morning through Monday evening.

Areas in the flood watch could receive 1.50” to 2.50” of rainfall with localized spots seeing up to 3.50.” The Bluegrass and northern counties will likely end up somewhere between 0.25” and 1.00.” Rainfall and possible flooding will be the major concern with this storm system.

Snowfall is also expected as the front clears the state and cold air pumps in from the north. Temperatures will plummet to the low 30s Tuesday morning as the last of the showers move through. Rain is expected to transition over to snow Tuesday morning. Some accumulations will be possible, and more likely the further north you live.

Snow amounts are generally expected to be light for the Bluegrass and eastern counties. Trace amounts and up to a half inch is possible, although accumulations will be limited to grassy and elevated surfaces. I-71 and up to Cincy could see amounts between 1.00” and 3.00.” Use caution if driving north on I-75 Tuesday morning.

Due to the snowfall expected, a WINTER WEATHER ADVISORY has been issued for counties along the Ohio River until Monday at 7:00 p.m.

After the rain and snow clears Tuesday around noon, skies will begin to clear as high pressure slides in after the storm. Temperatures remain cold through the middle of the week.