Alert archive / Louisiana / Special Marine Warnings in 2021

Special Marine Warning 412, NWS New Orleans, LA

July 12, 2021

NWS New Orleans, LA issued this special marine warning at Jul 12, 2021, 1:11 PM CDT. It was in force for 64 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: Jul 12, 2021, 1:11 PM CDT (18:11 UTC)
Expired: Jul 12, 2021, 2:15 PM CDT
In force: 64 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 Jul 12, 12:37 PM CDT, 34 minutes earlier.

Area forecast discussion, Jul 12, 12:37 PM CDT, 34 minutes before

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In the hours before

Special weather statement, Jul 12, 11:14 AM CDT, 1 hour 57 minutes before

Special Weather Statement
National Weather Service New Orleans LA
1114 AM CDT Mon Jul 12 2021

LAZ039-075-076-MSZ077-080-081-121700-
Washington-Southeast St. Tammany-Northwest St.
Tammany-Harrison-Hancock-Pearl River-
1114 AM CDT Mon Jul 12 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT ST. TAMMANY AND
SOUTHEASTERN WASHINGTON PARISHES...NORTHWESTERN HARRISON...HANCOCK
AND PEARL RIVER COUNTIES...

At 1114 AM CDT, radar indicated strong thunderstorms were located
along a line extending from 6 miles southwest of Lumberton to near
Madisonville. Movement was southeast at 25 mph.

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

Locations impacted include...
Slidell, Picayune, Covington, Poplarville, Pearl River, Abita
Springs, Madisonville, Sun, Kiln, Lacombe, Crossroads, Stennis Space
Center, Bush, Mcneil, Pearlington and Slidell Airport.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 260 and 273.
 Interstate 10 in Mississippi between mile markers 1 and 7.
 Interstate 12 between mile markers 60 and 84.
 Interstate 59 in Louisiana between mile markers 1 and 11.
 Interstate 59 in Mississippi between mile markers 1 and 41.

If outdoors, consider seeking shelter inside a building.

LAT...LON 3098 8947 3098 8943 3100 8942 3099 8934
      3065 8934 3065 8925 3068 8924 3067 8915
      3018 8969 3018 8976 3025 8987 3026 8998
      3030 8999 3035 9006 3039 9020 3100 8960
      3101 8951
TIME...MOT...LOC 1614Z 298DEG 23KT 3095 8955 3038 9011

TB

Local storm report, Jul 12, 11:45 AM CDT, 1 hour 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1145 AM CDT MON JUL 12 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1143 AM     TSTM WND GST     13 SSW MANDEVILLE       30.19N 90.12W
07/12/2021  M46 MPH          GMZ530             LA   MESONET

            SENSOR RECORDED 46 MPH WIND GUST.

&&

KO

Special weather statement, Jul 12, 11:49 AM CDT, 1 hour 22 minutes before

Special Weather Statement
National Weather Service New Orleans LA
1149 AM CDT Mon Jul 12 2021

LAZ061-077-121715-
Western Orleans-Upper Jefferson-
1149 AM CDT Mon Jul 12 2021

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

At 1149 AM CDT, a strong thunderstorm was located over Metairie,
moving east at 25 mph.

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

Locations impacted include...
New Orleans, Metairie, Avondale, Harvey, Jefferson, Gretna, Harahan,
Westwego, Elmwood, Bridge City, River Ridge, Waggaman, New Orleans
Armstrong Airport and Lakefront Airport.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 222 and 243.
 Interstate 610 between mile markers 1 and 4.

If outdoors, consider seeking shelter inside a building.

LAT...LON 2997 9028 3005 9028 3002 9018 3002 9011
      3004 9006 3003 9003 3006 9003 3004 9002
      3005 8998 2991 9006 2991 9027
TIME...MOT...LOC 1649Z 273DEG 20KT 3000 9021

TB

Local storm report, Jul 12, 12:10 PM CDT, 1 hour 1 minute before

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Special weather statement, Jul 12, 12:23 PM CDT, 48 minutes before

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Local storm report, Jul 12, 12:24 PM CDT, 47 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 3:50 AM CDT	River Flood Warning	LIX	Saint Tammany	31 hr
Jul 12, 3:50 AM CDT	River Flood Warning	LIX	Saint Tammany	10 hr
Jul 12, 5:45 AM CDT	River Flood Warning	LIX	Saint Tammany	30 hr
Jul 12, 7:23 AM CDT	Special Weather Statement	LIX	West Feliciana	52 min
Jul 12, 8:04 AM CDT	Special Weather Statement	LIX	East Feliciana, Pointe Coupee, West Feliciana	56 min
Jul 12, 9:00 AM CDT	Special Weather Statement	LIX	East Baton Rouge, East Feliciana, Pointe Coupee, Saint Helena, West Baton Rouge, West Feliciana	30 min
Jul 12, 10:56 AM CDT	Special Marine Warning	LIX		64 min
Jul 12, 11:07 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson	8 min
Jul 12, 11:14 AM CDT	Special Weather Statement	LIX	Saint Tammany	46 min
Jul 12, 11:49 AM CDT	Special Weather Statement	LIX	Orleans	26 min
Jul 12, 11:56 AM CDT	Special Marine Warning	LIX		49 min
Jul 12, 12:05 PM CDT	Areal Flood Advisory	LIX	Saint Tammany	115 min
Jul 12, 12:15 PM CDT	Special Marine Warning	LIX		60 min
Jul 12, 12:23 PM CDT	Special Weather Statement	LIX	Jefferson, Lafourche	67 min
Jul 12, 1:43 PM CDT	Special Marine Warning	LIX		62 min
Jul 12, 2:13 PM CDT	Special Marine Warning	LIX		62 min
Jul 12, 3:11 PM CDT	Special Marine Warning	LIX		64 min
Jul 12, 4:10 PM CDT	Special Marine Warning	LIX		65 min
Jul 11, 7:32 PM CDT	River Flood Warning	LIX	Harrison	38 hr
Jul 12, 6:01 AM CDT	River Flood Warning	LIX	Pearl River	38 hr
Jul 12, 10:17 AM CDT	Special Weather Statement	LIX	Pearl River	43 min
Jul 12, 1:27 PM CDT	Special Weather Statement	LIX	Jackson	63 min

Nearby

Special Marine Warnings in Louisiana, 2021 Every 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.