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Area Forecast Discussion

401
FXUS64 KHUN 241738 AAC
AFDHUN

Area Forecast Discussion...UPDATED
National Weather Service Huntsville AL
1238 PM CDT FRI JUN 24 2016

.UPDATE...
For 18Z TAFs.

&&

.DISCUSSION...
 (Issued 1054 AM CDT FRI JUN 24 2016)
On radar, a few showers still linger along the TN River, slowly
dissipating as they move southeast. Visible satellite shows the
cloud cover associated with these showers extends back into southern
TN and is having an effect on the temp trend this morning. For
example, it`s 79 degrees in Scottsboro while sunshine has warmed Fort
Payne up to 86 degrees already.

The combination of the differential heating boundary along with
leftover mesoscale boundaries and an approaching upper-level
disturbance will allow for additional development this afternoon.
Therefore, expanded slight chance and chance POPs into NE AL through
this afternoon. Adjusted dewpoints up slightly to accommodate current
trends but will monitor as boundary slowly sags south. Big story for
this afternoon (and this weekend) is the heat index. This afternoon,
heat index values will range from the mid 90s in NE AL up to 105 in
far NW AL. These will hinge on the daytime temps reaching full
potential of climbing into the low-mid 90s.

JMS

&&

.AVIATION...
For 18Z TAFs: A slow-moving frontal boundary lies to our north early
this afternoon and in concert with a weak upper short wave will help
to instigate shower/storm development later this afternoon. Northern
areas are favored for development due to the closer proximity to
these features as they drift southward into our area. Scattered
shower activity is expected, although there still remains some
uncertainty regarding eventual shower coverage. Instability is
sufficient to produce strong updrafts and some thunderstorm activity
as well, but due to lack of confidence in exact locations of
development, will not mention TSRA in TAFs at this time. Will amend
as necessary if a TSRA and lower cig/vis affect a TAF site.

KDW

&&

.HUN Watches/Warnings/Advisories...
AL...Heat Advisory from 10 AM Saturday to 4 AM CDT Monday for ALZ001>010-
     016.

TN...Heat Advisory from 10 AM Saturday to 4 AM CDT Monday for TNZ076-096-
     097.

&&

$$

For more information please visit our website
at weather.gov/huntsville.



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