Area Forecast Discussion
Issued by NWS Paducah, KY

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122
FXUS63 KPAH 172002
AFDPAH

Area Forecast Discussion
National Weather Service Paducah KY
302 PM CDT Tue Oct 17 2017

.SHORT TERM...(Tonight through Thursday night)
Issued at 302 PM CDT Tue Oct 17 2017

A surface high pressure ridge axis will slowly move off to the
east of the PAH forecast area through midweek. This will allow a
modest and dry southerly to westerly low level flow to get
established over our region. Meanwhile, in response to shortwave
energy moving through the flow aloft in the western CONUS, a ridge
is forecast to build over the southeastern CONUS by the end of
the short term period.

Thus, no pcpn is forecast, and temps will be on a steady rise to
above seasonable averages by Thu (highs 75 to 80). With the lower
trop on the dry side, we tended to forecast a slightly greater
diurnal range than what guidance and the model blends offered.
Dewpoints are expected to rise roughly ten degrees or so during
this time, generally maintaining afternoon relative humidity
minimums in the 30-40 percent range.

Expect one more chilly night in the lower 40s, with the
possibility of fog forming over the warmer waters of lakes and
rivers.

.LONG TERM...(Friday through Tuesday)
Issued at 302 PM CDT Tue Oct 17 2017

Confidence remains fairly good with the extended...however there
is some discontinuity with timing of frontal passage. Confidence
is still high with a frontal passage Sunday.

We will start the extended with high pressure in charge of the
weather and much above normal temperatures. The southerly flow on
the back side of the high will continue to usher gulf moisture into
the region ahead of the approaching cold front late in the weekend.
Again pops start in the west late Saturday...mainly west of the
Interstate 57 corridor. The Canadian and GFS are supportive of
this start time. The ECMWF is several hours slower with the
arrival in the west early Sunday morning. Its not uncommon for the
GFS to slow its timing as we near the arrival of synoptic scale
systems. However the Canadian has supported this fropa when the
ECMWF didn`t even have a front. So will not dismiss the earlier
start time possibility. The best instability will of course be
pre-frontal, and the grids already reflect this with the best
chance of thunder late Saturday night and early Sunday morning.
After that, decrease to isolated or slgt chc during the day
Sunday. Again the chance of rain is highest during the frontal
passage Sunday. Chances really fall off Sunday night with dry and
cooler conditions arriving early next week. In fact by mid week we
could be below normal for temperatures...will monitor this
closely as grids do not currently reflect this at this time. As we
just witnessed the blend is not capturing the outbreak of colder
air this time of season.

&&

.AVIATION...
Issued at 302 PM CDT Tue Oct 17 2017

As a surface ridge axis gradually moves eastward, winds will
continue to be light and quite variable late today, go near calm
tonight, and pickup out of the south generally under 10 knots on
Wed. Some cirrus clouds will be seen from time to time as the only
clouds. Despite the dry atmosphere, some fog development is still
possible overnight at fog-prone locations such as KCGI.

&&

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

$$

SHORT TERM...DB
LONG TERM...KH
AVIATION...DB



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