Chalmette, Louisianna 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

336
FXUS64 KLIX 211910
AFDLIX

Area Forecast Discussion
National Weather Service New Orleans LA
210 PM CDT Sat Jun 21 2025

...New SHORT TERM, LONG TERM, MARINE...

.SHORT TERM...
(This evening through Sunday night)
Issued at 108 PM CDT Sat Jun 21 2025

Temperatures are once again soaring into the low to mid 90s across
the area this afternoon which coupled with dew points in the mid
to high 70s is making for a miserably hot and humid day. Heat
indices have been ranging between 100 and 110F, but predominantly
just below the 108F criteria for a heat advisory. The highest heat
indices have been recorded southwest of the lake like yesterday at
around 108 to 110F at MSY, APS, and REG though the latter two
temperature sensors might be running a tad too warm.

As we have reached peak daytime heating this early afternoon,
lake and sea breezes are beginning to initiate with showers and
weak thunderstorms. Storms will continue to expand in coverage
and propagate northwestward around the southwest flank of the
surface high pressure system into the late afternoon before
gradually dissipating by dusk. In other words, a fairly typical
summer day.

By Sunday, the axis of the upper-level ridge will lift out to the
northeast and amplify over the Appalachians and northeast CONUS
leading to a substantial heatwave for that region of the country,
but also help to gradually alleviate the suppression of afternoon
convection. However, latest guidance has continued to back off on
PoPs for Sunday showing more isolated storms than prior
indicating the lingering affects of the ridging and lack of lift
will continue to limit convective coverage to predominantly the
lake and sea breezes and outflow boundaries produced by pop up
storms. As such, PoPs were backed down below 50%, and coverage as
a whole appears to be more comparable to today instead of more
scattered/widespread. Even still, with earlier initiation of
convection anticipated tomorrow, temperatures and heat indices
will have less time to climb and thus will likely stay below heat
advisory criteria (closer to 100-105F heat indices).

&&

.LONG TERM...
(Monday through Friday night)
Issued at 108 PM CDT Sat Jun 21 2025

As the ridging erodes and southeasterly low-level flow takes hold
on the western flank of the Bermuda High early next week, we`ll
begin to see more subtle inverted surface troughs/easterly waves
follow the periphery of the high and enhance rain chances on
certain days. Global guidance tends to favor passage of one of
these waves on Monday into Tuesday which will help to enhance rain
chances with a more classic convectively active marine area in the
morning transitioning to more active afternoon convection inland.

As we transition to the back half of the week, we will need to
monitor how the massive 597dam ridge over the Mid Atlantic
propagates southward and breaks down as to whether we may see a
little resurgence in higher temps and lower rain chances to end
the week next week or not. No indications this could bring heat
indices to heat advisory criteria at this time, but hot and humid
is going to be the rule not the exception living along the
northern Gulf Coast anyways.

&&

.AVIATION...
(18Z TAFS)
Issued at 102 PM CDT Sat Jun 21 2025

VFR conditions likely to prevail through the period at most
terminals. PROB30 lines are included for sites with a low chance
for TSRA impacts later this afternoon predominantly along the lake
and sea breezes which could result in brief IFR to LIFR
conditions. Showers and storms will clear after sunset and VFR
conditions with light variable winds will prevail. There is again
a chance for MVFR to IFR fog at MCB near sunrise.

&&

.MARINE...
Issued at 108 PM CDT Sat Jun 21 2025

Easterly to southeasterly winds at 15 knots or less is expected
throughout the forecast period while we stay positioned on the
southwest flank of the broad Bermuda High over the southwest
Atlantic. A few pop up storms could occur tonight, but is more
likely on Monday and Tuesday mornings with the passage of a weak
easterly wave. A few of these storms could be strong and cause
significant wind shifts, high winds and seas, frequently
lightning, and waterspouts.

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  73  92  72  91 /  20  30  20  40
BTR  74  93  74  92 /  20  40  20  70
ASD  73  92  74  91 /  10  30  20  60
MSY  78  92  79  92 /  10  40  20  70
GPT  76  90  76  89 /  10  40  20  60
PQL  73  92  74  91 /  10  40  20  60

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...Heat Advisory until 7 PM CDT this evening for LAZ037-039-057-058-
     060-064-071-076>090.

GM...None.
MS...Heat Advisory until 7 PM CDT this evening for MSZ070-071-077-
     083>088.

GM...None.
&&

$$

SHORT TERM...TJS
LONG TERM....TJS
AVIATION...TJS
MARINE...TJS