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Area forecast discussion...updated 
National Weather Service Paducah Kentucky
633 am CDT Wednesday Jul 29 2015

issued at 633 am CDT Wednesday Jul 29 2015

Updated the aviation discussion for the 12z taf issuance.


Short term...(today through Friday night)
issued at 214 am CDT Wednesday Jul 29 2015

Above average confidence in the short term as latest model guidance
in better agreement.

Looks like our area is in for one more day of oppressive heat and
humidity...then relief is on the way. If there is a lack of cloud
cover and precipitation today like the models are
will be another miserable day where outdoor work/activities are
concerned. Highs today are expected to top out in the middle 90s
over the western half of our County Warning Area and in the lower 90s over the
eastern half. Combined with dewpoints in the upper 70s west and
middle 70s east...heat indices should top out at or above 110 west and at or above
105 east. Consequently will continue with excessive heat warning
west and heat advisory east.

A Bona fide cold front is forecast to slowly cross the region today.
It should enter the northwest sections of our County Warning Area around midday and
clear the southeast corner of our County Warning Area by middle evening. Even with
plenty of moisture and instability...coverage of showers and
thunderstorms should be limited due to lack of both low level
convergence along the boundary and upper support. Precipitation
chances may linger over the southeast sections of our County Warning Area this
evening before the scouring out of the deeper moisture by the
frontal boundary.

Beyond that that with high pressure at the surface and northwest
flow should be dry and getting cooler with lower
humidities through the end of the period.

Long term...(saturday through tuesday)
issued at 214 am CDT Wednesday Jul 29 2015

The extended forecast can be summed up as mostly rain-free...
somewhat cooler...and certainly less humid. The pah forecast area
will be under nwrly flow aloft...and mostly nwrly dry flow in the
lower tropopause. Within this flow...there will tend to be minor
perturbations from time to time...the timing and intensity of which
the medium range deterministic models may not always agree on. One of
these...late in the weekend...should result in at least a surface wind
shift...and possibly some isolated shower or thunderstorm activity north of I-
64. the day 7 (tue) time frame...the models have
suggested at one time or another that a surface boundary of some sort
will approach the pah forecast area...and they continue to. As the
parent northern stream shortwave approaches...vorticity in the increasingly
divergent flow aloft may provide enough additional lift of unstable
parcels for widely scattered showers and thunderstorms in the heat of the

Highs in the upper 80s north...and lower 90s south can be expected
through the extended forecast period. With the exception of Sunday
morning when lows will be a few degrees cooler...lows will be in the
upper 60s to around 70.


issued at 633 am CDT Wednesday Jul 29 2015

With the exception of MVFR ceilings/visibilities in thunderstorms and rain at kevv/kowb...VFR
conditions should prevail at all sites through the period. A cold
front will cross the sites today which will cause southwest winds
at or below 5 knots to gradually veer around to the northwest.


Pah watches/warnings/advisories...
Illinois...excessive heat warning until 7 PM CDT this evening for ilz084-

Heat advisory until 7 PM CDT this evening for ilz075>078-080>083-

MO...excessive heat warning until 7 PM CDT this evening for moz076-

In...heat advisory until 7 PM CDT this evening for inz081-082-085>088.

Kentucky...excessive heat warning until 7 PM CDT this evening for

Heat advisory until 7 PM CDT this evening for kyz007>022.



Short term/
long term/fire weather...db

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