Special Weather Statement, NWS New Orleans, LA

Area Forecast Discussion
National Weather Service New Orleans LA
411 PM CDT Sun Aug 1 2021

.SHORT TERM (Tonight through Wednesday)...

The words "cold front" and "August" are not often associated
together in SE Louisiana and Southern Mississippi but stranger
things do happen. The persistent ridging over the west will allow
for deepening mid latitude low pressure across the eastern half of
the country. This pattern will allow for a quasi-stationary
boundary to slowly works it way south across Mississippi through
tonight before entering our realm on sometime Monday afternoon
into the evening. Scattered to widespread showers and
thunderstorm will develop along and ahead of the front. Monday
will likely be the most active day as far as the active weather
goes, but even so the scattered convection will likely continue
through Wednesday. With expected showers and cloud cove,
temperatures could actually be a little below the norm although
not significantly so. High temperatures will be in the mid to
upper 80s to around lower 90s. However, we should be well below
the need for any heat advisories

.LONG TERM(Thursday through  Saturday)...

The long term forecast begins with the a strong 500mb high
pressure system firmly entrenched over the western half of the
CONUS. As such, there remains weak troughing in the mid level
stretching from the Great Lakes region and south into the Gulf
Coast region. Meanwhile the remnants of a weak cold front will be
meandering across the northern GoM or evening stalled across far
southern SE LA parishes. This will keep at least some chances for
scattered showers and thunderstorms across most of the area into
Saturday. Most of the activity will still generally be diurnal in
nature. However, a higher a more robust shortwave will move across
the Southeastern US and help to amplify convective activity
Friday afternoon in to Saturday, with more widespread shower and
thunderstorms expected. As far as temps go, conditions should be
close to normal for early August with highs in the lower 90s and
overnight lows in the low to mid 70s.

&&

.AVIATION (valid 18Z Sunday through 00z Tuesday)...

High pressure will keep mainly VFR conditions through the
afternoon. Isolated convection has been slow to initiate today
with only a few coastal storms and a some shower near McComb. As
such, have only kept a mention of VCTS at terminal through the
heat of the day with diurnally driven convection ending tonight.
For the Monday morning/afternoon timeframe, a weak cold front will
sag into SE LA/S MS bringing better chances for more widespread
shower or thunderstorms activity. MVFR cigs could be possible
with any storms.

&&

.MARINE...

Marine conditions will generally consist of low seas and light
southerly winds tonight and into Monday. A weak frontal boundary
will move near or into the coastal waters possibly Tuesday into
Wednesday with coverage of showers and thunderstorms increasing.
Unsettled marine conditions will continue through the week.

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  74  88  72  86 /  50  90  60  50
BTR  75  89  73  87 /  50  90  70  60
ASD  77  91  74  89 /  60  90  80  70
MSY  80  92  79  89 /  50  90  80  70
GPT  77  90  74  87 /  60  90  80  60
PQL  76  92  73  87 /  60  90  80  60

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...Heat Advisory until 7 PM CDT this evening for LAZ034>037-039-
     046>050-056>061-063>065-071-072-075>078.

GM...None.
MS...Heat Advisory until 7 PM CDT this evening for MSZ068>071-077-
     080>082.

GM...None.
&&

Special Weather Statement
National Weather Service New Orleans LA
411 PM CDT Sun Aug 1 2021

MSZ068-069-012200-
Wilkinson-Amite-
411 PM CDT Sun Aug 1 2021

...A STRONG THUNDERSTORM WILL AFFECT EASTERN WILKINSON AND WESTERN
AMITE COUNTIES...

At 410 PM CDT, a strong thunderstorm was located near Garden City, or
20 miles northwest of Liberty, moving south at 10 mph.

Wind gusts of 25 to 30 mph, heavy rainfall, and frequent
lightning.

Locations impacted include...
Centreville, Gloster and Crosby.

Torrential rainfall is occurring with this storm, and may cause
localized street flooding. Do not drive your vehicle through flooded
roadways.

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

LAT...LON 3134 9115 3132 9112 3133 9107 3134 9106
      3133 9106 3133 9103 3135 9102 3134 9099
      3108 9094 3107 9125 3135 9121
TIME...MOT...LOC 2110Z 357DEG 9KT 3130 9111

95/DM

Special Weather Statement
National Weather Service New Orleans LA
430 PM CDT Sun Aug 1 2021

LAZ061-077-012200-
Western Orleans-Upper Jefferson-
430 PM CDT Sun Aug 1 2021

...A STRONG THUNDERSTORM WILL AFFECT WEST CENTRAL ORLEANS AND NORTH
CENTRAL JEFFERSON PARISHES...

At 429 PM CDT, a strong thunderstorm was located over Metairie,
moving west at 5 mph.

Winds in excess of 30 mph are possible with this storm.

Locations impacted include...
Metairie, Avondale, Jefferson, Harahan, Westwego, Elmwood, Bridge
City and River Ridge.

This includes Interstate 10 in Louisiana between mile markers 226 and
231.

Torrential rainfall is also occurring with this storm, and may cause
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 2993 9022 3003 9021 3002 9011 2992 9013
TIME...MOT...LOC 2129Z 110DEG 6KT 2998 9017

GP

Special Weather Statement
National Weather Service New Orleans LA
433 PM CDT Sun Aug 1 2021

LAZ037-050-071-072-012200-
Livingston-St. Helena-Northern Tangipahoa-Southern Tangipahoa-
433 PM CDT Sun Aug 1 2021

...A STRONG THUNDERSTORM WILL AFFECT EASTERN ST. HELENA...NORTH
CENTRAL LIVINGSTON AND NORTHWESTERN TANGIPAHOA PARISHES...

At 432 PM CDT, a strong thunderstorm was located near Kentwood, or 8
miles northeast of Greensburg, moving south at 15 mph.

Winds in excess of 40 mph are possible with this storm.

Locations impacted include...
Greensburg, Amite, Amite City, Kentwood, Independence, Roseland,
Montpelier and Tangipahoa.

This includes Interstate 55 in Louisiana between mile markers 38 and
62.

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm, and may cause
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 3097 9061 3093 9038 3058 9044 3067 9080
TIME...MOT...LOC 2132Z 016DEG 15KT 3088 9054

TD

Special Weather Statement
National Weather Service New Orleans LA
443 PM CDT Sun Aug 1 2021

LAZ039-075-MSZ077-012215-
Washington-Northwest St. Tammany-Pearl River-
443 PM CDT Sun Aug 1 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL ST. TAMMANY...
SOUTHEASTERN WASHINGTON PARISHES IN SOUTHEASTERN LOUISIANA AND
SOUTHWESTERN PEARL RIVER COUNTIES...

At 442 PM CDT, a strong thunderstorm was located near Sun, or near
Bogalusa, moving south at 15 mph.

Winds in excess of 35 mph are possible with this storm.

Locations impacted include...
Bogalusa, Picayune, Covington, Abita Springs, Sun, Bush and
Crossroads.

This includes Interstate 59 in Mississippi between mile markers 5 and
10.

Torrential rainfall is also occurring with this storm, and may cause
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 3083 8967 3051 8961 3049 9009 3074 9006
TIME...MOT...LOC 2142Z 004DEG 14KT 3070 8986

GP

Special Weather Statement
National Weather Service New Orleans LA
508 PM CDT Sun Aug 1 2021

LAZ037-012230-
St. Helena-
508 PM CDT Sun Aug 1 2021

...A STRONG THUNDERSTORM WILL AFFECT ST. HELENA PARISH...

At 507 PM CDT, a strong thunderstorm was located near Montpelier, or
near Greensburg, moving south at 15 mph.

Winds in excess of 30 mph are possible with this storm.

Locations impacted include...
Greensburg, Montpelier and Darlington.

Torrential rainfall is also occurring with this storm, and may cause
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 3091 9082 3090 9057 3066 9057 3065 9085
TIME...MOT...LOC 2207Z 004DEG 13KT 3073 9066

GP

Special Weather Statement
National Weather Service New Orleans LA
513 PM CDT Sun Aug 1 2021

LAZ036-MSZ068-069-012245-
East Feliciana-Wilkinson-Amite-
513 PM CDT Sun Aug 1 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN EAST FELICIANA
PARISH...SOUTHEASTERN WILKINSON AND SOUTHWESTERN AMITE COUNTIES...

At 512 PM CDT, a strong thunderstorm was located near Centreville, or
15 miles west of Liberty, moving south at 15 mph.

Winds in excess of 30 mph are possible with this storm.

Locations impacted include...
Jackson, Clinton, Centreville, Gloster, Wilson, Norwood and Felps.

Torrential rainfall is also occurring with this storm, and may cause
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 3120 9112 3119 9089 3081 9088 3081 9122
TIME...MOT...LOC 2212Z 004DEG 13KT 3114 9106

GP