Alert archive / Louisiana / Special Marine Warnings in 2021

Special Marine Warning 449, NWS New Orleans, LA

August 3, 2021

NWS New Orleans, LA issued this special marine warning at Aug 3, 2021, 8:42 AM CDT. It was in force for 63 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 3, 2021, 8:42 AM CDT (13:42 UTC)
Expired
Aug 3, 2021, 9:45 AM CDT
In force
63 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
0.0 in
Wind
34.0 mph

What forecasters said that day

The local office's own words before this special marine warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS New Orleans, LA wrote its last area forecast discussion before this special marine warning went out at Aug 3, 6:17 AM CDT, 2 hours 25 minutes earlier.

Area forecast discussion, Aug 3, 6:17 AM CDT, 2 hours 25 minutes before
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In the hours before

Special weather statement, Aug 3, 6:33 AM CDT, 2 hours 9 minutes before
Special Weather Statement
National Weather Service New Orleans LA
633 AM CDT Tue Aug 3 2021

LAZ069-031200-
Lower Plaquemines-
633 AM CDT Tue Aug 3 2021

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN PLAQUEMINES
PARISH...

At 633 AM CDT, a strong thunderstorm was located over Venice, or 26
miles southeast of Port Sulphur, moving east at 20 mph.

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

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

LAT...LON 2919 8934 2916 8937 2917 8944 2935 8945
      2936 8938 2933 8937 2936 8937 2935 8930
      2931 8924 2935 8920 2929 8914 2930 8918
      2927 8921 2925 8912 2918 8910 2920 8914
      2919 8914 2917 8910 2914 8911 2914 8925
TIME...MOT...LOC 1133Z 268DEG 16KT 2927 8937
Special weather statement, Aug 3, 6:44 AM CDT, 1 hour 58 minutes before
Special Weather Statement
National Weather Service New Orleans LA
644 AM CDT Tue Aug 3 2021

LAZ046-049-056>059-065>067-031245-
Lower Terrebonne-Iberville-Ascension-Upper Terrebonne-Lower
Lafourche-Assumption-St. John The Baptist-St. James-Upper Lafourche-
644 AM CDT Tue Aug 3 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHWESTERN ST. JOHN
THE BAPTIST...WESTERN ASCENSION...ST. JAMES...NORTHEASTERN
TERREBONNE...SOUTHEASTERN IBERVILLE...NORTHWESTERN LAFOURCHE AND
NORTHEASTERN ASSUMPTION PARISHES...

At 644 AM CDT, radar indicated strong thunderstorms were located
along a line extending from near Belle Rose to near Chauvin. Movement
was northeast at 10 mph.

Winds in excess of 30 mph are possible with these storms.

Locations impacted include...
Houma, Thibodaux, Gonzales, Donaldsonville, Napoleonville, Galliano,
Larose, Cut Off, Lockport, Golden Meadow, White Castle, Sorrento,
Mathews, Schriever, Chauvin, Geismar, Supreme, Raceland, Chackbay and
Montegut.

This includes Interstate 10 in Louisiana between mile markers 174 and
187.

LAT...LON 2931 9063 3011 9121 3031 9091 2939 9024
      2934 9046 2934 9049 2935 9051 2936 9050
      2936 9052 2933 9052
TIME...MOT...LOC 1144Z 244DEG 11KT 3008 9110 2940 9060
Special weather statement, Aug 3, 7:47 AM CDT, 55 minutes before
Special Weather Statement
National Weather Service New Orleans LA
747 AM CDT Tue Aug 3 2021

LAZ048>050-057>061-063-064-067>070-072-077-031415-
St. Charles-Livingston-Ascension-Lower Jefferson-Southern
Tangipahoa-Lower St. Bernard-St. James-East Baton Rouge-Lower
Plaquemines-Western Orleans-Upper St. Bernard-Lower Lafourche-St.
John The Baptist-Upper Plaquemines-Upper Lafourche-Upper Jefferson-
747 AM CDT Tue Aug 3 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT ST. JOHN THE BAPTIST...
CENTRAL ASCENSION...NORTHEASTERN ST. JAMES...SOUTHWESTERN ST.
BERNARD...ST. CHARLES...SOUTHWESTERN ORLEANS...SOUTHERN LIVINGSTON...
NORTHEASTERN LAFOURCHE...JEFFERSON...SOUTHERN TANGIPAHOA...
NORTHWESTERN PLAQUEMINES AND SOUTH CENTRAL EAST BATON ROUGE
PARISHES...

At 746 AM CDT, radar indicated strong thunderstorms were located
along a line extending from near Prairieville to 7 miles northeast of
Cut Off. Movement was east at 20 mph.

Winds in excess of 30 mph are possible with these storms.

Locations impacted include...
New Orleans, Hammond, Gonzales, Reserve, Metairie, Hahnville,
Laplace, Marrero, Chalmette, Avondale, Harvey, Timberlane, Belle
Chasse, Port Sulphur, Jefferson, Gretna, Harahan, Westwego,
Ponchatoula and Gramercy.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 166 and 170, and
between mile markers 184 and 245.
 Interstate 12 between mile markers 36 and 45.
 Interstate 55 in Louisiana between mile markers 1 and 30.
 Interstate 310 between mile markers 1 and 11.
 Interstate 610 between mile markers 1 and 4.

LAT...LON 3037 9105 3051 9039 3036 9025 3019 9043
      3009 9041 3006 9037 3002 9018 3005 8997
      2966 8961 2968 8964 2968 8966 2964 8966
      2961 8963 2963 8968 2961 8973 2953 8966
      2951 8967 2949 8998 2952 9000 2949 9024
TIME...MOT...LOC 1246Z 262DEG 17KT 3032 9092 2956 9021

The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 3, 4:23 AM CDTSpecial Marine WarningLIX67 min
Aug 3, 6:33 AM CDTSpecial Weather StatementLIXPlaquemines27 min
Aug 3, 6:44 AM CDTSpecial Weather StatementLIXAscension, Lafourche, Saint James61 min
Aug 3, 7:47 AM CDTSpecial Weather StatementLIXSaint Charles, Saint John the Baptist88 min
Aug 3, 8:50 AM CDTAreal Flood AdvisoryLIXOrleans, Saint Bernard19 min
Aug 3, 9:09 AM CDTFlash Flood WarningLIXOrleans2 hr
Aug 3, 10:04 AM CDTSpecial Marine WarningLIX86 min
Aug 3, 10:24 AM CDTSpecial Marine WarningLIX96 min
Aug 3, 10:40 AM CDTAreal Flood AdvisoryLIXAscension, East Baton Rouge, Livingston90 min
Aug 3, 10:53 AM CDTAreal Flood AdvisoryLIXAscension, East Baton Rouge, Livingston77 min
Aug 3, 11:04 AM CDTSpecial Marine WarningLIX116 min
Aug 3, 11:40 AM CDTSpecial Marine WarningLIX110 min
Aug 3, 11:49 AM CDTSpecial Marine WarningLIX86 min
Aug 3, 11:52 AM CDTSpecial Marine WarningLIX113 min
Aug 3, 2:45 PM CDTFlash Flood WarningLIXEast Baton Rouge, Livingston4 hr
Aug 3, 3:00 PM CDTAreal Flood AdvisoryLIXJefferson, Orleans, Saint Charles, Saint John the Baptist3 hr
Aug 3, 3:28 PM CDTFlash Flood WarningLIXSaint Charles, Saint John the Baptist2 hr
Aug 3, 3:39 PM CDTAreal Flood AdvisoryLIXJefferson, Orleans, Plaquemines, Saint Bernard119 min
Aug 3, 3:52 PM CDTAreal Flood AdvisoryLIXAscension, Saint Charles, Saint James, Saint John the Baptist103 min
Aug 3, 4:39 PM CDTAreal Flood AdvisoryLIXSaint Charles, Saint James, Saint John the Baptist50 min
Aug 3, 4:53 PM CDTFlash Flood WarningLIXSaint James, Saint John the Baptist39 min
Aug 3, 5:27 PM CDTAreal Flood AdvisoryLIXSaint Tammany, Tangipahoa, Washington3 hr
Aug 3, 5:33 PM CDTAreal Flood AdvisoryLIXSaint Tammany117 min
Aug 3, 6:33 PM CDTAreal Flood AdvisoryLIXHancock, Harrison117 min

Nearby

Special Marine Warnings in Louisiana, 2021Every special marine warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.