000
AGUS71 KTIR 242021
HMDTIR
Ohio River Basin Hydrometeorological Discussion
Ohio River Forecast Center, Wilmington, Ohio
320 PM EST Tuesday, November 24, 2009 

...HYDROMETEOROLOGICAL DISCUSSION...
Generally dry weather is forecast today, however, a frontal boundary
arriving later in the day will spread rain into the western Ohio Valley
during the afternoon and evening hours. The rain will spill into the
central basin overnight, then the eastern basin Wednesday. Rainfall amounts
will be modest. On Thanksgiving Day, a deep upper-level low will dive into 
the region, bringing a blast of colder air with scattered showers. Some 
of these will be snow showers on Thursday night and early Friday. The 
inclement weather will be short-lived. A ridge of high pressure will build 
in for the weekend with drier and warmer conditions. 

...FLOOD POTENTIAL DISCUSSION...
With no widespread heavy rain in the forecast, no river flooding
is expected through the week and into the weekend.

...24-HR OBSERVED PRECIPITATION USED FOR TODAY'S RIVER FORECASTS...
Light rain was observed across most of the eastern Ohio Valley and parts of
the central and western areas. For the most part, rainfall amounts remained
well under a quarter inch, except for a few locations in the higher
elevations of the Appalachians. 

...24-HOUR FORECAST PRECIPITATION USED FOR TODAY'S RIVER FORECASTS...
Light rain is forecast across most of the western and central Ohio Valley.
Amounts will generally remain under a tenth of an inch, except between a
tenth and a quarter inch in eastern Illinois, central and northern Indiana,
and northwest Ohio. 

...RIVER BASINS IN FLOOD...
None.

Detailed precipitation graphics and other maps are available on the HAS Support
Page at this web address:  http://weather.gov/ohrfc/HAS

$$
jm