Area Forecast Discussion
Issued by NWS Lake Charles, LA

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FXUS64 KLCH 121950
AFDLCH

Area Forecast Discussion
National Weather Service Lake Charles LA
250 PM CDT Wed Aug 12 2020

.DISCUSSION...
Wx map shows surface high pressure ridging across the Gulf. Radar
continues to show isolated to scattered showers and thunderstorms
across Southeast Texas to Central and Southern Louisiana. The large
cluster of showers and thunderstorms across S AR/N LA has weakened,
and will likely not be an issue for our region. Expecting the
activity across our region to dissipate after sunset.

Temperatures ranging in the lower to mid 90s across the area.
Dewpoints have lowered to the mid 70s across most locations, with
upper 70s dewpoints still hanging across the coastal parishes/counties.
This is giving heat values averaging 105-107, with a few locations,
like BPT and PTN yielding around 108-110. With the mid 90s this
afternoon across SE TX, will keep the Heat Advisory through 7 PM.
Elsewhere, heat index values expected to range 105-107, and may
briefly touch 108-109 for an hour, but not long enough to warrant
expanding the heat advisory eastward at this time. Overnight lows
only in the mid to upper 70s expected. Thursday, will likely see a
repeat performance of lower to mid 90s. Still borderline on
whether heat index values will reach 108 or higher across portions
of the area.

Forecast for Thursday into early next week will be dominated by a
building mid to upper ridge across the Western and Central U.S.
with a deepening long wave trough over the Eastern U.S. Quite the
gradient of temperature, and pops expected across the region
during this time. Closer to the ridge over Inland SE TX/C LA,
warmer than normal temperatures in the mid to upper 90s and only
isolated showers and thunderstorms. Higher shower and
thunderstorm chances expected, along with lower afternoon highs,
over South Central Louisiana.

By the end of the forecast period, high pressure aloft expected to
retreat westward, allowing for the longwave trough to expand over
the Central U.S. which may, I repeat, may allow for a weak cool
front with slightly lower dewpoints by Tuesday and Wednesday.

DML

&&

.MARINE...
A mainly light onshore flow will continue for the next several
days as weak surface high pressure will be found across the
northern Gulf of Mexico.

&&

.PRELIMINARY POINT TEMPS/POPS...
AEX  75  96  75  96 /  20  40  10  30
LCH  78  93  78  93 /  10  30   0  20
LFT  77  94  77  94 /  20  50  10  50
BPT  78  93  78  93 /  10  20   0  20

&&

.LCH WATCHES/WARNINGS/ADVISORIES...
LA...None.
TX...Heat Advisory until 7 PM CDT this evening for TXZ180-201-215-216-
     259>262.

GM...None.
&&

$$

PUBLIC...08



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