Flash Flood Warning 20, NWS New Orleans, LA

Area Forecast Discussion
National Weather Service New Orleans LA
646 PM CST Sat Feb 3 2024

...New UPDATE, AVIATION...

.UPDATE...
Issued at 620 PM CST Sat Feb 3 2024

We're observing a strong mesoscale low with enhanced low-level
jetstream tracking north-northeastward from Barataria Bay. A
recent wind gust to 53 mph was observed at Grand Isle with 80 knot
winds observed on TMSY at around 2000ft. Therefore, areas of the
wind advisory for coastal LA have been upgraded to a high wind
warning for wind gusts of 50 to 60 mph. Current trajectory brings
the jet associated with this meso low just east of downtown New
Orleans, but glancing blow of impacts with gusts upwards of 40 mph
are still possible. Wind advisories have been raised for the
surrounding parts of the lake and the small craft advisory has
been upgraded to a Gale Warning for the Tidal Lakes in
anticipation for this jet reaching Lake Borgne and eastern Lake
Pontchartrain in the next hour.

This meso low will continue its way north-northeast toward Lake
Borgne and coastal MS over the next few hours where we expect
impacts to spread toward. Uncertainty remains as to the highest
winds that will impact St. Tammany and coastal MS in the coming
hours and it is possible that damaging winds reach these hours and
prompt upgrades to the wind advisories in these areas.

&&

.SHORT TERM...
(This evening through Monday night)
Issued at 217 PM CST Sat Feb 3 2024

Biggest weather impacts to the local area this forecast period are
expected now through the early morning hours of Sunday. Upper air
analysis shows a ridge extending form the eastern Gulf of Mexico to
the Great Lakes and a closed low near the Texas/Oklahoma panhandles.
At the surface, there's one low in the Texas panhandle and
cyclogenesis starting in the northwestern Gulf of Mexico. This second
low and frontogenesis appendant to it will track east along the
northern Gulf Coast this afternoon through tonight. Radar shows a
wide swath of showers and coastal thunderstorms moving into and
across the CWA ahead of these features. Latest lightning data
shows the vast majority of storms to be offshore, where the warm
sector is ahead of the developing boundary. Models in good
agreement that this warm sector with mid 60 degree dewpoints
remains offshore for the duration of the event, as does severe
potential. However, there's a small window of opportunity for
lightning farther inland from pressure height falls as the surface
low moves in closer and mid-level heights fall. QPF will be
greatest at this point, but still on the lower end of the spectrum
in terms of significant impacts as the line of showers and storms
should be moving quite quickly eastward.

The other aspect to look closer at is surface winds. As the surface
low deepens and passes through the CWA this afternoon and evening,
the pressure gradient will tighten quite a bit. Current surface obs
show offshore winds already responding to this. For inland areas,
not as confident that these stronger winds will push inland much.
Although meso model wind gust outputs suggest stronger winds do
move inland some, its questionable how much of this is
convective feedback. Thus will forego a Wind Advisory beyond
immediate coastal areas but closely monitoring winds this
afternoon/evening. In coastal areas, stronger winds are more
likely as marine obs in many locations are in the vicinity of wind
advisory conditions. Thus, putting out a Wind Advisory for
immediate coastal parishes/counties. As soon as the low and
boundary moves east of the CWA, forecast winds drop pretty
quickly. Thus, will be a relatively short duration Advisory. One
additional potential to keep an eye on is the possibility of a
wake low to develop on the back side of convection. SPC meso
analysis page shows what may be one developing. Current thinking
is that if it does in fact develop, should stay right along the
nearshore coastal waters and feel relatively comfortable that
stronger winds would remain in the areas covered by either the
Wind Advisory or Gale Warning.

Latest forecast of POPs reflects current radar trends as well as
a blend of NBM and CAM model runs. Areal rainfall amounts of 1 to
2 inches likely with isolated areas of 3 to 4 inches.

As today/tonight's surface low moves through on Sunday, the upper
low will begin to stretch out as it tracks along the southeast US.
As many cold core lows do, this one will do its best to squeeze what
little moisture is available out of the atmosphere. So still have a
slight chance showers along northern borders of the CWA Sunday and
again on Monday as the low moves into the northeastern Gulf of
Mexico. The low will draw down colder temps from the north and bring
highs to slightly below normal values.

&&

.LONG TERM...
(Tuesday through Friday night)
Issued at 217 PM CST Sat Feb 3 2024

The middle half of next week looks pretty quiet weather-wise as
strong upper level ridge follows in the footsteps of the upper low.
Temperatures will moderate slightly each day, with highs reaching
into the low 70s by Friday. Before the end of the week, a northern
stream trough looks to drag a frontal boundary into the region.
Thunder appears unlikely at this point with coverage well below 50%.

&&

.AVIATION...
(00Z TAFS)
Issued at 620 PM CST Sat Feb 3 2024

Main feature throwing a wrench in the forecast currently is a
strong meso low producing wind gusts in excess of 50 to 60 mph
that is moving northeast from Barataria Bay. NEW, ASD, GPT have
highest concerns of impacts via wind gusts over the next 6 hours
with LLWS also becoming a concern due to drastic difference in
winds with height in excess of 40-50 knots at times.

Seeing MVFR or lower conditions with widespread light to moderate
rain continuing at many terminals. The back edge of these showers
are quickly clearing BTR, HUM and soon HDC. Timing probably is
pessimistic on this TAF cycle and could see clearing out quicker
at terminals. IFR to LIFR CIGs/VIS will likely build back down
overnight tonight as the larger low pressure system approaches,
but fog signal was very mixed. Should expect flight category
improvements to VFR by mid day Sunday.

&&

.MARINE...
Issued at 217 PM CST Sat Feb 3 2024

As stated with previous discussion, Hazardous to dangerous
conditions expected over marine areas are starting to develop in the
coastal waters. As a low develops and deepens while tracking east
across the local area, the pressure gradient will tighten
considerably. This will bring winds past Small Craft Criteria, right
into Gales. It will be short-lived, however, as the gradient weakens
by mid-morning Sunday as the low tracks east. Although there may be
a lull in winds before upper low and cold front moves through, winds
and seas should quickly come back up to Small Craft. Thus, issued an
Advisory to follow the Gale Warning. These conditions will likely
persist through Monday before slacking off Monday evening/overnight
as surface ridge building in weakens the pressure gradient. A couple
days of quiet marine conditions expected mid week with return of
windy conditions leading up a system late in the week.

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  48  63  44  57 / 100  30  50   0
BTR  50  68  49  61 /  90  20  30   0
ASD  51  66  47  61 / 100  20  40   0
MSY  52  68  49  59 / 100  10  30   0
GPT  52  65  46  61 / 100  40  30   0
PQL  52  68  44  61 /  90  40  30   0

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...Wind Advisory until midnight CST tonight for LAZ058>060-066-076-
     077-080-082-087.

     High Wind Warning until midnight CST tonight for LAZ064-067>070-
     078-088>090.

GM...Gale Warning until 9 AM CST Sunday for GMZ530-532-534-536-538-
     550-552-555-557-570-572-575-577.

     Small Craft Advisory from 9 AM Sunday to 6 PM CST Monday for
     GMZ536-538-550-552-555-557-570-572-575-577.

MS...Wind Advisory until midnight CST tonight for MSZ086>088.

GM...Gale Warning until 9 AM CST Sunday for GMZ532-534-536-538-550-
     552-555-557-570-572-575-577.

     Small Craft Advisory from 9 AM Sunday to 6 PM CST Monday for
     GMZ538-550-552-555-557-570-572-575-577.

&&

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

Special Weather Statement
National Weather Service New Orleans LA
401 PM CST Sat Feb 3 2024

LAZ059-060-067-068-077-087>090-032300-
Central Plaquemines LA-Western Orleans LA-St. Charles LA-
Lower Jefferson LA-Upper Plaquemines LA-Lower Lafourche LA-
Upper Jefferson LA-Upper Lafourche LA-Coastal Jefferson LA-
401 PM CST Sat Feb 3 2024

...GUSTY SHOWERS AND SOME LIGHTNING WILL IMPACT PORTIONS OF EASTERN
ST. CHARLES, SOUTHWESTERN ORLEANS, EAST CENTRAL LAFOURCHE, JEFFERSON
AND NORTHWESTERN PLAQUEMINES PARISHES THROUGH 500 PM CST...

At 400 PM CST, Doppler radar was tracking gusty showers along a line
extending from near Metairie to near Golden Meadow. Movement was
north at 15 mph.

HAZARD...Winds in excess of 40 to 45 mph.

SOURCE...Radar indicated and recent observations at KMSY reporting
         wind gusts to around 40 mph.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
New Orleans, Cut Off, Avondale, Metairie, Marrero, Harvey,
Timberlane, Galliano, Belle Chasse, Larose, Jefferson, Gretna,
Harahan, Westwego, Jean Lafitte, River Ridge, Ama, Estelle, St. Rose,
and Woodmere.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 218 and 242.
 Interstate 310 between mile markers 1 and 4.
 Interstate 610 between mile markers 1 and 4.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 2945 9035 3009 9033 3005 9011 3007 9000
      2954 9003 2945 9006 2944 9008
TIME...MOT...LOC 2200Z 177DEG 13KT 3003 9025 2944 9022

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

KLG

Special Weather Statement
National Weather Service New Orleans LA
429 PM CST Sat Feb 3 2024

LAZ064-067>070-077-078-087>090-032330-
Central Plaquemines LA-Lower Plaquemines LA-Western Orleans LA-
Upper St. Bernard LA-Lower Jefferson LA-Eastern Orleans LA-
Upper Plaquemines LA-Lower St. Bernard LA-Lower Lafourche LA-
Upper Jefferson LA-Coastal Jefferson LA-
429 PM CST Sat Feb 3 2024

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF NORTHWESTERN ST.
BERNARD, ORLEANS, EAST CENTRAL LAFOURCHE, CENTRAL JEFFERSON AND
NORTHWESTERN PLAQUEMINES PARISHES THROUGH 530 PM CST...

At 428 PM CST, Doppler radar was tracking strong thunderstorms along
a line extending from Arabi to 11 miles northeast of Leeville.
Movement was northeast at 15 mph.

HAZARD...Winds in excess of 40 to 45 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
New Orleans, Chalmette, Harvey, East New Orleans, Timberlane, Belle
Chasse, Marrero, Metairie, Gretna, Jean Lafitte, Woodmere, Violet,
Terrytown, Meraux, Lafitte, Poydras, Myrtle Grove, Estelle,
Barataria, and Arabi.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 230 and 255.
 Interstate 510 between mile markers 1 and 3.
 Interstate 610 between mile markers 1 and 4.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 2927 9016 2993 9011 3006 9018 3006 9006
      3009 8997 3017 8987 3013 8982 3014 8980
      2940 8986 2938 8990 2941 8992 2939 8996
      2936 8996
TIME...MOT...LOC 2228Z 232DEG 13KT 2995 9002 2936 9007

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

KLG

Special Weather Statement
National Weather Service New Orleans LA
523 PM CST Sat Feb 3 2024

LAZ076-079-080-040000-
Southeast St. Tammany LA-Northern St. Tammany LA-
Southwestern St. Tammany LA-
523 PM CST Sat Feb 3 2024

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF CENTRAL ST. TAMMANY
PARISH THROUGH 600 PM CST...

At 522 PM CST, Doppler radar was tracking strong thunderstorms along
a line extending from near Abita Springs to 7 miles north of New
Orleans. Movement was north at 20 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Slidell, Covington, Abita Springs, Madisonville, Lacombe, and Slidell
Airport.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 260 and 267.
 Interstate 12 between mile markers 60 and 84.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3064 9006 3055 8995 3025 8970 3019 8975
      3021 8985 3023 8989 3024 9000 3030 9002
      3039 9017
TIME...MOT...LOC 2322Z 188DEG 18KT 3042 9006 3018 8993

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

Zeringue

Special Weather Statement
National Weather Service New Orleans LA
530 PM CST Sat Feb 3 2024

LAZ059-060-064-068-070-077-078-087>090-040000-
Central Plaquemines LA-Western Orleans LA-St. Charles LA-
Upper St. Bernard LA-Lower Jefferson LA-Eastern Orleans LA-
Upper Plaquemines LA-Lower St. Bernard LA-Upper Jefferson LA-
Upper Lafourche LA-Coastal Jefferson LA-
530 PM CST Sat Feb 3 2024

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF NORTHWESTERN ST.
BERNARD, SOUTHEASTERN ST. CHARLES, ORLEANS, EAST CENTRAL LAFOURCHE,
JEFFERSON AND NORTHWESTERN PLAQUEMINES PARISHES THROUGH 600 PM CST...

At 530 PM CST, Doppler radar was tracking strong thunderstorms along
a line extending from near East New Orleans to near Cut Off. These
storms were nearly stationary.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
New Orleans, Chalmette, Avondale, Larose, Metairie, Marrero, Harvey,
East New Orleans, Timberlane, Belle Chasse, Jefferson, Gretna,
Harahan, Westwego, Jean Lafitte, River Ridge, Estelle, Woodmere,
Elmwood, and Terrytown.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 225 and 251.
 Interstate 510 between mile markers 1 and 3.
 Interstate 610 between mile markers 1 and 4.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 2956 9019 2956 9038 2961 9039 3007 9019
      3006 9006 3009 8997 3014 8992 3001 8982
      2952 9016
TIME...MOT...LOC 2330Z 345DEG 4KT 3005 8996 2958 9028

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

Zeringue

Special Weather Statement
National Weather Service New Orleans LA
557 PM CST Sat Feb 3 2024

LAZ059-060-064-067-068-077-078-087>090-040030-
Central Plaquemines LA-Western Orleans LA-St. Charles LA-
Upper St. Bernard LA-Lower Jefferson LA-Eastern Orleans LA-
Upper Plaquemines LA-Lower Lafourche LA-Upper Jefferson LA-
Upper Lafourche LA-Coastal Jefferson LA-
557 PM CST Sat Feb 3 2024

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF WEST CENTRAL ST.
BERNARD, EASTERN ST. CHARLES, SOUTHWESTERN ORLEANS, NORTHEASTERN
LAFOURCHE, JEFFERSON AND NORTHWESTERN PLAQUEMINES PARISHES THROUGH
630 PM CST...

At 557 PM CST, Doppler radar was tracking strong thunderstorms along
a line extending from near Metairie to 6 miles northeast of Larose.
These storms were nearly stationary.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
New Orleans, Chalmette, Cut Off, Avondale, Larose, Metairie, Marrero,
Harvey, East New Orleans, Timberlane, Belle Chasse, Jefferson,
Gretna, Harahan, Westwego, Jean Lafitte, Luling, River Ridge, Ama,
and Estelle.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 220 and 251.
 Interstate 310 between mile markers 1 and 3.
 Interstate 510 between mile markers 1 and 3.
 Interstate 610 between mile markers 1 and 4.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 2957 9049 3008 9028 3005 9011 3007 9002
      3008 8999 3011 8988 2945 9015
TIME...MOT...LOC 2357Z 123DEG 3KT 3002 9013 2962 9029

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

Zeringue

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