River Flood Warning 12, NWS Wilmington, OH

Area Forecast Discussion
National Weather Service Wilmington OH
1127 AM EST Sat Feb 17 2018

.SYNOPSIS...
An area of low pressure will move just southeast of the region
today while an upper level disturbance moves toward the
Great Lakes. The upper level disturbance will move away from the
region tonight. High pressure will allow for dry conditions on
Sunday.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
Observations just to our west/southwest is showing more snow at
the onset of precipitation. It now looks like there will be more
snow than rain early on, especially along and north of the Ohio
River. Believe there should be more of as transition to rain as
the afternoon wears on, especially closer to the Ohio River. As
a result of more snow, have allowed for a slushy snow
accumulation of a half inch or less roughly between the Ohio
River and I-70. Highs now will range from the mid to upper 30s.

Previous discussion--->

An upper level s/wv will approach the Great Lakes region from
the west today. The combination of a developing low to mid level
jet and upper divergence from the RR Quad of an enhancing upper
level jet will bring likely to categorical PoPs to much of the
forecast area. The northern periphery of the advancing
precipitation field may start briefly as snow or a rain/snow
mix. Then, it should transition to mostly rain by the mid
afternoon hours. Little snow accumulation is expected. Highs
will range from the upper 30s to around 40.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SUNDAY/...
Precipitation will still be ongoing at the start of the near
term with an upper level disturbance moving across northern
portions of the region. This feature will allow for some snow to
mix in with the rain. With temperatures still in the 30s do not
expect much in the way of accumulation. Precipitation will then
taper off overnight, however some cloud cover will remain.

High pressure will then work into the region for the day on
Sunday. WAA on Sunday and plenty of sunshine will allow
temperatures to climb into the middle 40s to the lower 50s. Went
close to guidance for temperatures on Sunday.

&&

.LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/...
A warm front will lift north across the area late Sunday night into
Monday morning. This will result in early lows Sunday night and then
rising temperatures. In addition, showers will develop and occur
ahead of the warm front. Initially, better chance of precipitation
will be in the western counties but then this shifts across the
northern counties on Monday.

In amplified upper level flow, frontal boundary to the west of the
region will be slow to move into the area. GFS has been more
progressive with this front, and while this cannot totally
discounted, have leaned towards slower ECMWF which has some support
from the Canadian. Rainfall will be focused closer to the front on
Tuesday with the greatest rainfall threat in the northwest counties.
This will then transition to more of a post-frontal precipitation
event which will translate across the region Tuesday night into
Wednesday night. Precipitable water is forecast to be very high,
greater than 200 percent of normal, so showers could be quite
efficient rain producers. The ground will be wet from previous
rainfall, so the threat of additional flooding is still a concern.

Ahead of the front, the airmass will be very warm and record
temperatures are possible on Tuesday. Given current frontal timing,
after morning highs temperatures will be falling during the day
Wednesday.

High pressure will briefly build in for Thursday. But the chance of
showers will return on Friday as another warm front pushes into the
area. Temperatures will be slightly above normal for the latter part
of the week.

&&

.AVIATION /18Z SATURDAY THROUGH THURSDAY/...
An area of low pressure will move southeast of the TAF sites
today and an upper level disturbance will move through later
today. These two features will bring precipitation to the region
today into this evening. Precipitation will generally be in the
form of rain to start out until the temperature profile gets
cool enough with the upper level disturbance for some snow to
also be possible across the region. Although precipitation is
not expected to be heavy, where snow occurs visibilities will
likely be reduced. Cigs will range from MVFR to IFR.

OUTLOOK...MVFR conditions are possible at times from Monday
through Wednesday.

&&

.ILN WATCHES/WARNINGS/ADVISORIES...
OH...None.
KY...None.
IN...None.

&&

SYNOPSIS...Hickman
NEAR TERM...Hickman
SHORT TERM...Novak
LONG TERM...
AVIATION...Novak

Hazardous Weather Outlook
National Weather Service Wilmington OH
336 AM EST Sat Feb 17 2018

INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046-
051>056-060>065-070>074-077>082-088-181000-
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-
336 AM EST Sat Feb 17 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.

Some river flooding will persist today. Please check our web site at
www.weather.gov/iln for more information on the river flooding.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Additional rainfall is expected Tuesday into Wednesday night. This
will lead to rises on area creeks and streams, along with the
potential for flooding, including at locations along the Ohio River.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.