Laplace, Louisianna 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

943
FXUS64 KLIX 261027 AAA
AFDLIX

Area Forecast Discussion...UPDATED
National Weather Service New Orleans LA
527 AM CDT Tue May 26 2026

...NEW AVIATION...

.KEY MESSAGES...
Updated at 525 AM CDT Tue May 26 2026

- Heavy rainfall continues to be the main weather threat through
  the week. Some of the stronger storms will be capable of
  producing hourly rainfall rates of 1-3" per hour. With mostly
  saturated soils, high rainfall rates even over short periods
  could overwhelm drainage systems, leading to ponding of water in
  low lying and poor drainage areas. Localized flash flooding
  could also result in some roads becoming impassable, mainly in
  areas where the heaviest rain falls, or where multiple storms
  result in longer periods of moderate to heavy rain.

- A Flood Watch will be in effect through 7 PM Tuesday generally
  for areas from the New Orleans metro eastward through the
  Mississippi Coast including the north shore. Elsewhere, the
  flood threat will be lower, though isolated flooding could still
  occur. Additional Flood Watches may be needed, especially
  Thursday.

&&

.SHORT TERM...
(Now through Thursday)
Issued at 156 AM CDT Tue May 26 2026

So far a rather rare sight here recently...a relatively rain free
night across the central Gulf Coast...at least for now. After
locations across the MS Gulf Coast got a season`s worth of rain in
the last week this is very much welcome.

However, the same pattern that soaked most of the area (and
flooded others) remains over the region today and the overall
pattern will likely persist through the short term period. The
active southwest flow will continue to bring shortwave after
shortwave over the region generally one every 12-18 hours or so.
Timing of the heaviest rainfall is still tricky as we have seen
the last few nights even after losing peak heating we have managed
to over perform in terms of overnight rainfall. That said, rain
chances increase when the upper H5 impulses move over during peak
heating where instability is maximized.

For Today, a few changes to note at least modest changes. There is
a bit more dry air in the mid and upper levels filtering into the
region. This means instability will likely be a bit higher with
somewhat better lapse rates. Also, PWAT values are a good bit
lower than yesterday with around 1.65-1.85" respectively. That
said, we don`t need PWATs to be near record territory for rainfall
rates that may cause a problem with the recent soakers we have
had. We will continue to FFA generally east of NOLA along I10
through this evening given the incredibly wet antecedent
conditions, especially along the MS Gulf Coast. CAMs are a bit
bullish with the parameters this afternoon. Delaying the
convective initiation time to just afternoon allows for moderate
instability to develop. Additionally, DCAPE values climb above
1000 J/KG leading to a conditional threat of a strong to severe
storm with gusty winds being the main concern.

Wednesday features what could be a MCS to our west moving east
with time out of Texas and then perhaps across the northern Gulf.
The cold pool looks to arrive generally around the time of peak
heating. Dry air in the mid levels decreases just a bit, but along
this boundary and/or any mesoscale boundaries that develop, storms
will again fire in the afternoon hours. PWATs slightly increase,
but similarly it will not take much heavy rainfall to cause
issues. Additional FFA`s may be needed, but again timing and
location for the heaviest rainfall is still tricky so opted not to
issue headlines for Wednesday for now.

After a brief break Wednesday night, Thursday looks to start early
with another impulse moving in later in the morning generating
additional convection across the region. Thursday is a bit
concerning because PWATs do bounce back over 2.0" once again and
with the rather defined wave aloft expect more widespread showers
and storms will develop and linger through the afternoon and early
evening hours.

Temperatures, today look to be a bit warmer considering a later
convective initiation time, but should still only climb into the
lower to middle 80s. Wednesday looks to be a bit on the warm side
as well, again with most of the convection waiting until later,
but Thursday looks cooler due to more widespread earlier
convection with most of the area only warming only into the lower
80s. (Frye)

&&

.LONG TERM...
(Thursday night through Monday)
Issued at 156 AM CDT Tue May 26 2026

The upper-level troughing stuck over the northwest Gulf within the
subtropical jet will continue to provide prevalent southwest flow
favorable for above normal chances for showers and storms,
especially during the daytime hours, through Friday. Storm flow will
continue to favor southwest to northeast motions within this upper-
level flow, particularly with more organized convective activity
coming out of southeast TX. However, exact timing, size, and
strength of any of these convective systems is about as good as
anybody`s guess at this lead time.

Upper troughing will gradually scoot eastward into the SE CONUS
causing more subtle shortwave ridging to move overhead this weekend
which could tamp down PoPs though summertime afternoon pop-up
convection would still be probable to provide some impacts to
outdoor plans even if it`s more isolated in nature.

By early next week, the global ensembles indicate that this
unsettled weather pattern could eventually break where a stronger,
more textbook, rex block attempts to establish across the north-
central CONUS and strengthen east coast troughing that could help
pivot upper-level flow into a more northwesterly orientation and
promote advection of drier, continental air. This would bring about
more climatologically normal chances for PoPs in the 20-50% range
headed into Monday and Tuesday. This solution does appear to have
some more run to run consistency, but I`m not trying to get
anybody`s hopes up just yet. (TJS)

&&

.AVIATION...
(12Z TAFS)
Issued at 525 AM CDT Tue May 26 2026

MVFR and perhaps lower CIGs/VIS will be possible through the
early morning hours. Conditions will improve shortly after
daybreak, however, like the last several days more convection is
anticipated with the highest confidence for terminals east of the
I55 corridor. Brief VIS/CIG reductions will be possible in and
around convection. Otherwise, outside of SHRA/TSRA expect VFR
conditions for the most part. Southerly winds will continue to be
light to moderate, but may be a bit erratic in and around
convection. (Frye)

&&

.MARINE...
Issued at 156 AM CDT Tue May 26 2026

High pressure anchored over the western Atlantic will maintain light
to moderate onshore flow across the local coastal waters. Daily
showers and storms will be capable of producing locally hazardous
winds and seas, with a few cells each day capable of producing winds
in excess of 34 kts over the next few days. (Frye)

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...Flood Watch through this evening for LAZ039-064-070-076>080-087-
     089>093-098>100.

GM...None.
MS...Flood Watch through this evening for MSZ077-083>088.

GM...None.
&&

$$

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