Area Forecast Discussion
Issued by NWS Paducah, KY

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000
FXUS63 KPAH 180753
AFDPAH

Area Forecast Discussion
National Weather Service Paducah KY
253 AM CDT Sun Jun 18 2017

.SHORT TERM...(Today through Tuesday night)
Issued at 253 AM CDT Sun Jun 18 2017

With the MCS entering the area and a Watch in effect will attempt
to be brief.

There appears to be plenty of instability to keep the MCS going
across much of the area through daybreak, but not sure if the wind
fields will be sufficient to keep the winds near severe levels.
We have had a rash of 40-45kt observations just upstream, and
hopefully it will stay in that range. Most of the available
guidance indicates that the system should be weakening as we head
toward daybreak, and the leading line convection certainly looks
strongest from northwest Jefferson county northward, while the
rest of the line looks rather unorganized. As for the watch we
decided to err on the side of caution. It will likely be done well
before 9 AM.

The 00Z models are quite muddled with the surface pattern later
today. The outflow from this system should push through the entire
area regardless of the strength of the convection, and the cold
front is not very well defined as it moves through our region.
The convective debris will make it hard to destabilize today, and
with the front not being very sharp/convergent, development may
not be as widespread as previously thought, and it may take longer
into the afternoon for it to develop. Not sure how much convection
we will see and therefore severe storms seem like a long shot at
this point.

It still looks like it may take most of tonight to get the front
and the last of the convection out of the area, but the cooler
weather is still on track for Monday. Unfortunately, it will warm
up above normal again on Tuesday.

.LONG TERM...(Wednesday through Saturday)
Issued at 253 AM CDT Sun Jun 18 2017

We will have weak high pressure over the area on Wednesday with dry
but warm conditions. It will not feel as humid on Wednesday either
with dew points progged to be in the lower 60s This high moves east
during the day on Wednesday and into Wednesday night.

We continue to watch a system that will be coming onshore in the
Gulf. Of course models differ on the track of this system but both
the Canadian and ECMWF bring moisture northward into our area
Thursday into Friday. This will mean the humid conditions will be
returning along with the chances for rain. The GFS shunts the system
eastward into the Gulf Coast states and keeps the moisture to our
southeast. If the Canadian and ECMWF are correct and that Gulf
system or remnants thereof come right up the Mississippi River, we
could see precipitation as early as Thursday night. These model
differences affect the forecast for Friday as well. However, the GFS
does indicate that deeper moisture will infiltrate the eastern parts
of the forecast area by Friday. Therefore, we will continue
advertising the best chances in the eastern half on Friday given the
path of the aforementioned system.

However, by Friday night into Saturday, we will be dealing with an
incoming frontal boundary from the north. Timing is fairly good
between models and good chances for convection will arrive Friday
night and last at least through Saturday night. Models have been
consistent in drying things out Sunday morning into the afternoon.

We will see high temperatures a few degrees either side of 90 for
Wednesday through Friday, with slightly lower temperatures on
Saturday given clouds/precipitation and lower readings on Sunday
behind the front.

&&

.AVIATION...
Issued at 657 PM CDT Sat Jun 17 2017

Main concern over the next 24 hours is with a thunderstorm complex
forecast to dive southeast into the region overnight into Sunday
morning. Gusty winds and lower cigs/vsbys can be expected with this
activity. Preliminary indications are that this complex may reach
far northwest counties around 05-07z and then progress southeast
through the area, exiting much of the region by 14-16z. Timing is
subject to change as some guidance is a bit faster or slower with
the convective complex. The potential for another round of storms
tomorrow afternoon across southeastern portions of the area is
largely contingent on how the first round evolves. Most of this
activity should be focused in western Kentucky. Otherwise, expect
VFR conditions through much of the period outside of thunderstorm
activity. Southerly winds tonight will tend to veer to the west as a
cold front moves through on Sunday.


&&

.PAH WATCHES/WARNINGS/ADVISORIES...
IL...None.
MO...None.
IN...None.
KY...None.
&&

$$

SHORT TERM...DRS
LONG TERM...CW
AVIATION...RJP



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