353
FXUS64 KLCH 201113
AFDLCH

Area Forecast Discussion
National Weather Service Lake Charles LA
613 AM CDT Sun Sep 20 2026

...New AVIATION...

.KEY MESSAGES...

- Precipitation chances will increase but remain isolated through
  next week as a high pressure remains centered nearly overhead.

- A weak "frontal" boundary will bring some drier air back into
  the region Wednesday through late next week.

&&

.DISCUSSION...
(Today through Saturday)
Issued at 1234 AM CDT Sun Sep 20 2026

Aloft, high pressure is centered over the ArkLaTex, with an area
of high pressure at the surface over the Gulf Coast. Thanks to
light southerly to southeasterly flow, moisture has returned to
the area, as indicated by rising dewpoints, especially over the
coastal areas. Temperatures over the next few days will be warmer,
in the mid to upper 90s, with even some low triple digits
possible. Despite the rise in temperatures and dewpoints, values
will remain below Heat Advisory criteria. Nevertheless, it is
worth mentioning the elevated heat indices. As moisture gradually
returns, isolated PoPs could also return to the forecast. Chances
overall will remain low due to the influence of the upper ridge;
however, it will not completely shut out the chance of some
diurnally driven/seabreeze activity.

The upper ridge will weaken somewhat as a shortwave moves across
the Northern Plains. In addition, a weak frontal boundary is
forecast to move through Tuesday into Wednesday. With antecedent
conditions being a bit drier, not much in the way of showers and
storms is expected as the boundary quickly sweeps through.
However, northerly winds are forecast to prevail through the end
of the week. This will usher in drier air, and temperatures will
likely fall into the low to mid 90s, a decrease from 6 to 13
degrees above normal to a more modest 4 to 7 degrees above
normal.

&&

.AVIATION...
(12Z TAFS)
Issued at 612 AM CDT Sun Sep 20 2026

Patchy fog will burn away after sunrise. Conditions will be VFR
through the day with light winds.

&&

.MARINE...
Issued at 1234 AM CDT Sun Sep 20 2026

Light east to southeast winds and low seas will exist across the
coastal waters through Tuesday. A weak frontal boundary may move
into the coastal waters Wednesday, with offshore winds increasing
into SCEC criteria and increasing rain chances.

&&

.FIRE WEATHER...
Issued at 1234 AM CDT Sun Sep 20 2026

Min RH values to increase into the lower 40s to lower 50s for the
beginning to middle of the work week as onshore flow becomes
established. Little to no rainfall expected during this period.

&&

.LCH WATCHES/WARNINGS/ADVISORIES...
LA...None.
TX...None.
GM...None.
&&

$$

PUBLIC/FIRE/MARINE...87
AVIATION...14