Special Weather Statement, NWS New Orleans, LA

Area Forecast Discussion
National Weather Service New Orleans LA
331 PM CDT Wed Aug 11 2021

.SHORT TERM...
Tonight through Friday...
The normal summertime pattern will dominate the region for the
next few days. Southerly surface winds will help to advect warm
air and moisture into the area, which will enhance lifting in the
environment. PW values will be above 2.1", which is above the 75th
percentile for the SPC sounding climatology. As a result, rainfall
will be more efficient and rainfall rates will be high inside
thunderstorm development. Scattered showers and storms will be
likely each day Thursday and Friday, mainly during the afternoon
and early evening hours. Locally heavy rainfall will be a concern
inside thunderstorm development, based on the model parameters. In
addition, gusty winds and frequent lightning will be possible
inside thunderstorm development. Heat index values will be warm,
in the low to mid-100s for the next couple of days during peak
daytime heating hours. So, staying hydrated while spending time
outdoors is important. However, the afternoon showers and storms
could provide some relief from the heat as well. MSW

.LONG TERM...
Saturday through Tuesday...
Saturday through Tuesday, the pattern will be fairly similar to
the previous couple days with a couple changes, mainly regarding the
potential for more enhanced rainfall. Easterly surface winds will
help to advect some moisture and warm air into the area, which
will provide some weak lifting in the environment. PW values will
be increasing through the weekend with models showing PW values
over 2.2" during daytime hours, which is above the 90th percentile
for the SPC sounding climatology. Consequently, rainfall will be
very efficient overall, and rainfall rates will be high inside of
thunderstorm development. Additionally, rainfall coverage area
will be increasing through the weekend into early next week as
well. Scattered showers and storms will be possible each day
mainly during the afternoon peak heating hours. Locally heavy
rainfall will be possible inside thunderstorm development, based
on the model parameters. Gusty winds and frequent lightning will
also be a concern inside these storms.

Another feature worth noting in the long term forecast is
Tropical Storm Fred, which is currently moving over the Dominican
Republic/Haiti. It is expected to approach the Florida Keys by the
weekend, and it is expected to make landfall along the
northeastern Gulf Coast by early next week as a tropical storm.
Overall, there are still a lot of uncertainties with this system,
looking at the models, so we will be monitoring this system very
closely in the next few days/week. We are steadily approaching
the peak of hurricane season, so regardless, it is always a good
idea to have a plan in place ahead of time and be prepared. MSW

&&

.AVIATION...
18Z TAF Package...
VFR conditions prevail at all area airports currently. Tempo
groups are highlighted for lower ceilings and visibilities (MVFR
conditions) for BTR, MSY, HUM, ASD, HDC, and NEW due to afternoon
showers and thunderstorms that will be likely this afternoon.
LIFR conditions will be possible at MCB for fog that will be
likely around daybreak tomorrow morning. At GPT, VFR conditions
will persist throughout the entire forecast package. At all area
airports, wind shifts greater than 30 degrees will be possible
throughout the forecast period as well. MSW

&&

.MARINE...
Winds will be southerly to easterly and moderate (<15 knots) tonight
through Friday. Saturday through Monday, winds will be easterly
to northeasterly and moderate (<15 knots). Tuesday through
Wednesday, winds will be southerly to southwesterly and moderate
(<15 knots). Wave heights will correspond to the wind speeds. MSW

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  72  92  73  93 /  20  60  10  50
BTR  73  91  74  93 /  20  70  10  60
ASD  75  92  75  94 /  20  70  20  50
MSY  79  92  79  95 /  20  80  20  50
GPT  76  91  76  92 /  30  60  20  50
PQL  74  92  75  93 /  20  60  20  50

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...None.
GM...None.
MS...None.
GM...None.
&&

Special Weather Statement
National Weather Service New Orleans LA
251 PM CDT Wed Aug 11 2021

LAZ069-112045-
Lower Plaquemines LA-
251 PM CDT Wed Aug 11 2021

...A strong thunderstorm will impact portions of southeastern
Plaquemines Parish through 345 PM CDT...

At 251 PM CDT, Doppler radar was tracking a strong thunderstorm near
Venice, or 31 miles southeast of Port Sulphur, moving northwest at 15
mph.

HAZARD...Winds in excess of 30 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Buras, Boothville-venice, Boothville, Buras-triumph, Venice and
Boothville Asos.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 2925 8950 2925 8957 2940 8949 2938 8939
      2921 8919 2915 8917 2915 8924 2914 8917
      2902 8918 2911 8925 2905 8931 2915 8927
      2916 8938 2915 8939 2911 8932 2902 8934
TIME...MOT...LOC 1951Z 134DEG 11KT 2920 8933

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

CAB

Special Weather Statement
National Weather Service New Orleans LA
324 PM CDT Wed Aug 11 2021

LAZ047-048-050-112100-
Livingston LA-West Baton Rouge LA-East Baton Rouge LA-
324 PM CDT Wed Aug 11 2021

...Strong thunderstorms will impact portions of east central West
Baton Rouge, northwestern Livingston and central East Baton Rouge
Parishes through 400 PM CDT...

At 323 PM CDT, Doppler radar was tracking strong thunderstorms near
Merrydale, or near Baton Rouge, moving north at 20 mph.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Baton Rouge, Baker, Denham Springs, Port Allen, Oak Hills Place,
Westminster, Old Jefferson, Merrydale, Inniswold, Watson, Village St.
George, Shenandoah, Gardere, Brownfields, Greenwell Spring and Baton
Rouge Airport.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 152 and 167.
 Interstate 12 between mile markers 1 and 14.
 Interstate 110 in Louisiana between mile markers 1 and 8.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3065 9091 3036 9089 3032 9115 3033 9115
      3056 9134
TIME...MOT...LOC 2023Z 159DEG 19KT 3047 9107

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

BL

Special Weather Statement
National Weather Service New Orleans LA
340 PM CDT Wed Aug 11 2021

LAZ046-047-112115-
Iberville LA-West Baton Rouge LA-
340 PM CDT Wed Aug 11 2021

...A strong thunderstorm will impact portions of southwestern West
Baton Rouge and central Iberville Parishes through 415 PM CDT...

At 339 PM CDT, Doppler radar was tracking a strong thunderstorm near
Grosse Tete, or 12 miles west of Plaquemine. This storm was nearly
stationary.

HAZARD...Winds in excess of 30 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Addis, Brusly, Maringouin, Rosedale, Grosse Tete, Ramah and Bayou
Sorrel.

This includes Interstate 10 in Louisiana between mile markers 130 and
149, and near mile marker 151.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3049 9156 3045 9125 3006 9130 3006 9137
      3010 9138 3010 9146 3011 9147 3019 9147
      3020 9149 3023 9148 3024 9157 3031 9162
TIME...MOT...LOC 2039Z 187DEG 3KT 3035 9143

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH

MSW

Special Weather Statement
National Weather Service New Orleans LA
420 PM CDT Wed Aug 11 2021

LAZ034-035-046-047-112200-
Iberville LA-Pointe Coupee LA-West Baton Rouge LA-West Feliciana LA-
420 PM CDT Wed Aug 11 2021

...Strong thunderstorms will impact portions of northwestern West
Baton Rouge, south central West Feliciana, southeastern Pointe Coupee
and northwestern Iberville Parishes through 500 PM CDT...

At 420 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near New Roads to Rosedale to Butte La Rose.
Movement was northwest at 5 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...
New Roads, Livonia, Maringouin, Fordoche, Rosedale, Grosse Tete,
Ramah and Erwinville.

This includes Interstate 10 in Louisiana between mile markers 128 and
142.

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.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3055 9164 3089 9151 3064 9131 3037 9141
      3026 9159 3032 9163 3035 9163 3037 9164
      3038 9163 3044 9164 3050 9172
TIME...MOT...LOC 2120Z 132DEG 5KT 3063 9140 3042 9147 3029 9171

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

PG

Special Weather Statement
National Weather Service New Orleans LA
511 PM CDT Wed Aug 11 2021

LAZ034-035-MSZ068-112315-
Pointe Coupee LA-West Feliciana LA-Wilkinson MS-
511 PM CDT Wed Aug 11 2021

...Strong thunderstorms will impact portions of central West
Feliciana, central Pointe Coupee Parishes in southeastern Louisiana
and central Wilkinson Counties through 615 PM CDT...

At 511 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles north of Woodville to near Wakefield to
near New Roads. Movement was north at 5 mph.

HAZARD...Winds in excess of 30 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
New Roads, St. Francisville, Woodville, Wakefield and Dolorosa.

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.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3120 9126 3087 9134 3062 9147 3083 9160
      3115 9144 3132 9140 3134 9138 3134 9135
      3135 9134 3136 9130
TIME...MOT...LOC 2211Z 163DEG 6KT 3120 9131 3094 9137 3075 9146

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

PG

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