Special Weather Statement, NWS New Orleans, LA

Area Forecast Discussion
National Weather Service New Orleans LA
1213 PM CDT Sat Aug 19 2017

.AVIATION...

VFR conditions will prevail at all of the terminals through the
forecast period. The biggest concern will be thunderstorms
developing between 18z and 00z today that could impact any of the
terminals for brief periods of time. Have included VCTS wording to
reflect this risk at most of the terminals. However, at KHUM, have
included a couple of hours of MVFR visbilities and prevailing
thunder in a tempo group as rainfall probabilities currently are
highest at this terminal for this afternoon. The biggest concern
with any convection will be strong gusty winds and wind shear near
the thunderstorms as well as periods of IFR visibility
restrictions as the storms move through.  32

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  74  92  74  91 /  20  30  20  30
BTR  74  93  76  92 /  10  30  20  40
ASD  75  93  76  90 /  10  30  20  40
MSY  77  93  78  90 /  10  30  20  50
GPT  76  92  78  89 /  10  30  20  40
PQL  74  93  77  90 /  10  30  20  40

&&

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

Hazardous Weather Outlook
National Weather Service New Orleans LA
1103 AM CDT Sat Aug 19 2017

GMZ530-532-534-536-538-550-552-555-557-570-572-575-577-LAZ034>037-
039-040-046>050-056>072-MSZ068>071-077-080>082-200415-
Lake Pontchartrain and Lake Maurepas-Mississippi Sound-
Lake Borgne-Chandeleur Sound-Breton Sound-
Coastal Waters from Port Fourchon LA to Lower Atchafalaya River
LA out 20 nm-
Coastal waters from the Southwest Pass of the Mississippi River
to Port Fourchon Louisiana out 20 NM-
Coastal Waters from Boothville LA to Southwest Pass of the
Mississippi River out 20 nm-
Coastal waters from Pascagoula Mississippi to Stake Island out
20 NM-
Coastal waters from Port Fourchon Louisiana to Lower Atchafalaya
River LA from 20 to 60 NM-
Coastal waters from Southwest Pass of the Mississippi River to
Port Fourchon Louisiana from 20 to 60 NM-
Coastal Waters from Stake Island LA to Southwest Pass of the
Mississippi River from 20 to 60 nm-
Coastal waters from Pascagoula Mississippi to Stake Island
Louisiana out 20 to 60 NM-Pointe Coupee-West Feliciana-
East Feliciana-St. Helena-Washington-St. Tammany-Iberville-
West Baton Rouge-East Baton Rouge-Ascension-Livingston-Assumption-
St. James-St. John The Baptist-Upper Lafourche-St. Charles-
Upper Jefferson-Orleans-Upper Plaquemines-Upper St. Bernard-
Upper Terrebonne-Lower Terrebonne-Lower Lafourche-Lower Jefferson-
Lower Plaquemines-Lower St. Bernard-Northern Tangipahoa-
Southern Tangipahoa-Wilkinson-Amite-Pike-Walthall-Pearl River-
Hancock-Harrison-Jackson-
1103 AM CDT Sat Aug 19 2017

This Hazardous Weather Outlook is for portions of Southeast
Louisiana...South Mississippi and the adjacent coastal waters.

.DAY ONE...This Afternoon and Tonight

Afternoon showers and thunderstorms are expected. A few could be
strong to possibly severe with damaging downburst winds. Frequent
lightning and heavy downpours with localized flooding are a
potential as well.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Daily afternoon thunderstorms are expected through next week. A
few of the storms each day could become strong, producing gusty
winds, frequent lightning and heavy downpours that could result
in localized street flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

32

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Special Weather Statement
National Weather Service New Orleans LA
100 PM CDT SAT AUG 19 2017

MSZ082-191830-
Jackson-
100 PM CDT SAT AUG 19 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTH CENTRAL JACKSON COUNTY...

At 100 PM CDT, a strong thunderstorm was located over Gulf Park
Estates, or near Ocean Springs. the storm is nearly stationary.

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

Locations impacted include...
Ocean Springs, Gautier and Gulf Park Estates.

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 3036 8868 3034 8870 3034 8874 3037 8878
      3038 8878 3038 8877 3039 8878 3040 8878
      3042 8869 3036 8866
TIME...MOT...LOC 1800Z 346DEG 3KT 3037 8873

32

Special Weather Statement
National Weather Service New Orleans LA
102 PM CDT SAT AUG 19 2017

LAZ039-MSZ071-191830-
Washington-Walthall-
102 PM CDT SAT AUG 19 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN WASHINGTON PARISH
IN SOUTHEASTERN LOUISIANA AND SOUTHEASTERN WALTHALL COUNTIES...

At 102 PM CDT, a strong thunderstorm was located near Sandy Hook,
moving south at 15 mph.

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

Locations impacted include...
Varnado, Dexter and Angie.

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 3111 8994 3111 8993 3107 8992 3108 8984
      3100 8984 3100 8977 3086 8978 3085 8978
      3085 8979 3083 8979 3083 8978 3082 8979
      3088 9009 3113 8999 3113 8994
TIME...MOT...LOC 1802Z 010DEG 13KT 3106 8989

32

Special Weather Statement
National Weather Service New Orleans LA
115 PM CDT SAT AUG 19 2017

MSZ081-191845-
Harrison-
115 PM CDT SAT AUG 19 2017

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CENTRAL HARRISON
COUNTY...

At 114 PM CDT, radar indicated strong thunderstorms were located
along a line extending from near Lyman to St. Martin. Movement was
west at 5 mph.

Winds in excess of 40 mph are possible with these storms.

Locations impacted include...
Gulfport, Biloxi, St. Martin, D'iberville, Lyman and Latimer.

Torrential rainfall is also occurring with these storms, 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 3039 8891 3041 8899 3042 8892 3043 8893
      3043 8899 3042 8901 3041 8900 3048 8931
      3054 8917 3047 8888 3043 8888 3042 8890
      3043 8892 3042 8891 3041 8891 3041 8886
      3039 8886
TIME...MOT...LOC 1814Z 079DEG 6KT 3050 8921 3043 8887

32