Area Forecast Discussion
Issued by NWS Huntsville, AL
FXUS64 KHUN 242316
Area Forecast Discussion
National Weather Service Huntsville AL
616 PM CDT WED AUG 24 2016
For 00Z TAFs.
(Issued 304 PM CDT WED AUG 24 2016)
Water vapor imagery and RAP H5 analysis indicated upper ridging in
place across the Southeast this aftn, with shortwaves riding around
the periphery, sparking convection across portions of GA/AL/MS/LA.
High pressure at the sfc extends SWwrd from the Carolinas down into
the TX/LA border. Convection in our local CWA remains rather spotty,
with a few showers/storms here and there mainly E of I-65. The bulk
of the convection associated with the approaching shortwave remains
over N/Central GA. Convection should sputter out shortly after sunset
this evening, with some patchy fog possible in areas in the E that
receive rainfall late this aftn.
Otherwise, the remainder of the forecast can be divided into two
sections, of sorts: Tonight through Monday, and then Tuesday through
the extended, with confidence decreasing the further you pan out in
Lows through Monday will slowly increase into the lower/middle 70s
with humid conditions in place (Td temps in the lower/middle 70s).
Partly cloudy conditions will prevail through this period, with the
exception of Friday, when mostly cloudy conditions are expected as a
front meanders southward toward our CWA. Friday also holds the
highest rain chances of the first half of the forecast period, with
slightly higher coverage of showers and storms expected. While
gusty winds and heavy rainfall will be possible from storms that
develop anytime from Thursday through Monday, slightly stronger
storms are possible Friday with the front in the vicinity, and
slightly higher CAPE values/Lapse Rates. Widespread severe weather is
not expected, however, gusty winds around 30-40mph will be the
primary threat. High temperatures during this time will top out in
the lower to middle 90s, and combined with the humid conditions in
place, will produce Heat Index values between 100-104F. This has been
highlighted in the HWO.
The second half of the forecast can be summed up in one word:
uncertain. Longer-range models develop the currently-named 99L in
the Caribbean into a tropical system and are having a difficult time
discerning exactly where the track will be. With model guidance from
the TX/LA border Ewrd to the Carolinas, will retain much of the
forecast from this time period, awaiting further clarity in future
For 00Z TAFs: VFR conditions expected through the TAF period with
winds generally light and variable. VIS may lower to 4-5SM at KMSL
overnight and included a TEMPO group. The chance is not high enough
to include at KHSV. A shower or two is possible Thursday afternoon
but not widespread enough to include in the TAFs.
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