Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

April 14, 2021Livingston Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Apr 14, 2021, 3:45 PM CDT for Livingston Parish, Tangipahoa Parish, Louisiana. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 14, 2021, 3:45 PM CDT (20:45 UTC)
Expired: Apr 14, 2021, 4:15 PM CDT
In force: 30 min
Issued by: NWS New Orleans, LA

Counties Livingston Parish, LA, Tangipahoa Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.8 hours before the alert went out and 98 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1255 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 133 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 weather statement went out at Apr 14, 1:25 PM CDT, 2 hours 20 minutes earlier.

Area forecast discussion, Apr 14, 1:25 PM CDT, 2 hours 20 minutes before

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In the hours before

Special weather statement, Apr 14, 11:28 AM CDT, 4 hours 17 minutes before

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Special weather statement, Apr 14, 11:58 AM CDT, 3 hours 47 minutes before

Special Weather Statement
National Weather Service New Orleans LA
1158 AM CDT Wed Apr 14 2021

LAZ069-141730-
Lower Plaquemines-
1158 AM CDT Wed Apr 14 2021

...A STRONG THUNDERSTORM WILL AFFECT WEST CENTRAL PLAQUEMINES
PARISH...

At 1157 AM CDT, a strong thunderstorm was located 9 miles southwest
of Port Sulphur, moving northeast at 35 mph.

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

Locations impacted include...
Port Sulphur and Empire.

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 2931 8987 2935 8983 2939 8986 2937 8979
      2941 8978 2941 8987 2945 8982 2948 8984
      2942 8993 2946 8996 2945 8990 2958 8971
      2950 8964 2946 8952 2942 8952 2934 8974
      2938 8972 2938 8977 2934 8975 2931 8986
TIME...MOT...LOC 1657Z 236DEG 33KT 2943 8985

MSW

Special weather statement, Apr 14, 12:32 PM CDT, 3 hours 13 minutes before

Special Weather Statement
National Weather Service New Orleans LA
1232 PM CDT Wed Apr 14 2021

LAZ059>061-063-065>067-141800-
Lower Terrebonne-St. Charles-Upper Terrebonne-Lower Lafourche-Upper
Plaquemines-Upper Lafourche-Upper Jefferson-
1232 PM CDT Wed Apr 14 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHERN ST. CHARLES...
CENTRAL TERREBONNE...NORTHEASTERN LAFOURCHE AND NORTHWESTERN
JEFFERSON PARISHES...

At 1231 PM CDT, radar indicated strong thunderstorms were located
along a line extending from Waggaman to 19 miles west of Dulac.
Movement was east at 45 mph.

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

Locations impacted include...
Houma, Cut Off, Larose, Belle Chasse, Marrero, Avondale, Harvey,
Hahnville, Westwego, Lockport, Jean Lafitte, Mathews, Chauvin, Dulac,
Luling, Boutte, Raceland, Estelle, Montegut and Bayou Cane.

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 2930 9093 2933 9093 2934 9096 2933 9100
      2930 9099 2931 9112 2934 9113 2994 9040
      2985 9001 2933 9047 2933 9049 2936 9052
      2931 9052 2932 9050 2928 9055
TIME...MOT...LOC 1731Z 275DEG 38KT 2992 9023 2931 9102

MSW

Special weather statement, Apr 14, 1:02 PM CDT, 2 hours 43 minutes before

Special Weather Statement
National Weather Service New Orleans LA
102 PM CDT Wed Apr 14 2021

LAZ059-061-063-066>070-141830-
Lower Terrebonne-Lower Plaquemines-Lower Jefferson-Lower St.
Bernard-Lower Lafourche-Upper Plaquemines-Upper Lafourche-Upper
Jefferson-
102 PM CDT Wed Apr 14 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTH CENTRAL ST.
BERNARD...SOUTHEASTERN TERREBONNE...SOUTHEASTERN LAFOURCHE...CENTRAL
JEFFERSON AND NORTHWESTERN PLAQUEMINES PARISHES...

At 101 PM CDT, radar indicated strong thunderstorms were located
along a line extending from near Jean Lafitte to near Cocodrie.
Movement was east at 40 mph.

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

Locations impacted include...
Cut Off, Galliano, Larose, Belle Chasse, Port Sulphur, Golden Meadow,
Jean Lafitte, Lafitte, Port Fourchon, Myrtle Grove, Pointe A La
Hache, Barataria, Leeville, Cocodrie, Dulac, Tambour Bay Buoy, Grand
Isle and Lumcon Center Buoy.

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 2934 9035 2934 9036 2922 9040 2935 9043
      2913 9065 2916 9086 2986 9003 2970 8959
      2942 8981 2948 8984 2942 8994 2949 8989
      2944 9002 2936 9004 2935 8998 2926 8995
      2910 9019
TIME...MOT...LOC 1801Z 268DEG 37KT 2979 9007 2922 9073

MSW

Special weather statement, Apr 14, 1:32 PM CDT, 2 hours 13 minutes before

Special Weather Statement
National Weather Service New Orleans LA
132 PM CDT Wed Apr 14 2021

LAZ059-061-066>069-141900-
Lower Terrebonne-Lower Plaquemines-Lower Jefferson-Lower
Lafourche-Upper Lafourche-Upper Jefferson-
132 PM CDT Wed Apr 14 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT EAST CENTRAL
TERREBONNE...SOUTHEASTERN LAFOURCHE...CENTRAL JEFFERSON AND WEST
CENTRAL PLAQUEMINES PARISHES...

At 131 PM CDT, radar indicated strong thunderstorms were located
along a line extending from 9 miles south of Lafitte to 15 miles
southeast of Cocodrie. Movement was east at 35 mph.

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

Locations impacted include...
Cut Off, Port Sulphur, Galliano, Golden Meadow, Myrtle Grove, Pointe
A La Hache, Leeville, Lafitte and Grand Isle.

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 2916 9028 2915 9027 2920 9026 2928 9035
      2934 9035 2922 9040 2932 9042 2928 9049
      2969 9025 2960 8973 2955 8968 2940 8979
      2940 8978 2939 8982 2931 8984 2935 8984
      2930 8990 2935 8998 2926 8995 2909 9022
TIME...MOT...LOC 1831Z 283DEG 31KT 2956 9016 2909 9049

MSW

Special weather statement, Apr 14, 3:45 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service New Orleans LA
345 PM CDT Wed Apr 14 2021

LAZ037-048>050-058-071-072-075-142115-
Livingston-Ascension-St. Helena-Northern Tangipahoa-Northwest St.
Tammany-Southern Tangipahoa-St. John The Baptist-East Baton Rouge-
345 PM CDT Wed Apr 14 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHWESTERN ST. JOHN
THE BAPTIST...NORTHEASTERN ASCENSION...SOUTHEASTERN ST. HELENA...
NORTHWESTERN ST. TAMMANY...LIVINGSTON...TANGIPAHOA AND SOUTH CENTRAL
EAST BATON ROUGE PARISHES...

At 345 PM CDT, radar indicated strong thunderstorms were located
along a line extending from 7 miles east of Independence to near Old
Jefferson. Movement was east at 40 mph.

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

Locations impacted include...
Baton Rouge, Hammond, Denham Springs, Covington, Amite, Oak Hills
Place, Ponchatoula, Walker, Amite City, Livingston, Independence,
Roseland, French Settlement, Albany, Madisonville, Port Vincent,
Folsom, Springfield, Montpelier and Westminster.

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 3043 9120 3081 9057 3058 8995 3038 9023
      3013 9052 3041 9121
TIME...MOT...LOC 2045Z 288DEG 36KT 3067 9039 3037 9093

MSW

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 13, 7:36 PM CDT	Special Weather Statement	LIX	Assumption	24 min
Apr 13, 7:37 PM CDT	Special Weather Statement	LIX	Terrebonne	23 min
Apr 13, 9:31 PM CDT	River Flood Warning	LIX	Saint Tammany	4 days
Apr 13, 9:31 PM CDT	River Flood Warning	LIX	Saint Tammany	5 days
Apr 14, 7:29 AM CDT	Special Weather Statement	LIX	Pointe Coupee, West Feliciana	46 min
Apr 14, 7:34 AM CDT	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	41 min
Apr 14, 8:12 AM CDT	Special Weather Statement	LIX	East Feliciana	48 min
Apr 14, 8:18 AM CDT	Special Weather Statement	LIX	Pointe Coupee, West Feliciana	27 min
Apr 14, 8:24 AM CDT	Severe Thunderstorm Warning	LIX	East Feliciana, West Feliciana	12 min
Apr 14, 8:49 AM CDT	Special Weather Statement	LIX	East Baton Rouge, West Baton Rouge	56 min
Apr 14, 9:04 AM CDT	Special Weather Statement	LIX	East Feliciana, Saint Helena	41 min
Apr 14, 9:09 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, Iberville, Livingston, West Baton Rouge	36 min
Apr 14, 9:12 AM CDT	Special Weather Statement	LIX	Terrebonne	33 min
Apr 14, 9:34 AM CDT	Areal Flood Advisory	LIX	Ascension, East Baton Rouge, Livingston, Saint Helena, West Baton Rouge	116 min
Apr 14, 9:36 AM CDT	Special Weather Statement	LIX	Livingston	24 min
Apr 14, 9:41 AM CDT	Special Weather Statement	LIX	Ascension, Assumption, Livingston, Saint James	34 min
Apr 14, 10:01 AM CDT	Special Weather Statement	LIX	Washington	29 min
Apr 14, 10:11 AM CDT	Special Weather Statement	LIX	Jefferson, Lafourche	34 min
Apr 14, 10:15 AM CDT	Special Weather Statement	LIX	Saint Tammany	30 min
Apr 14, 10:16 AM CDT	Special Weather Statement	LIX	Saint James, Saint John the Baptist	29 min
Apr 14, 10:20 AM CDT	Special Weather Statement	LIX	Assumption	25 min
Apr 14, 10:24 AM CDT	River Flood Warning	LIX	Saint Tammany	3 days
Apr 14, 10:28 AM CDT	Special Weather Statement	LIX	East Feliciana, West Feliciana	32 min
Apr 14, 10:30 AM CDT	Special Weather Statement	LIX	Saint Tammany	30 min
Apr 14, 10:47 AM CDT	Special Weather Statement	LIX	Jefferson	28 min
Apr 14, 11:03 AM CDT	Special Marine Warning	LIX		57 min
Apr 14, 11:05 AM CDT	Special Weather Statement	LIX	Livingston, Saint Helena, Tangipahoa	25 min
Apr 14, 11:07 AM CDT	Special Marine Warning	LIX		53 min
Apr 14, 11:21 AM CDT	Special Weather Statement	LIX	Lafourche	24 min
Apr 14, 11:28 AM CDT	Special Weather Statement	LIX	Tangipahoa, Washington	32 min
Apr 14, 11:51 AM CDT	Special Marine Warning	LIX		54 min
Apr 14, 11:58 AM CDT	Special Weather Statement	LIX	Plaquemines	32 min
Apr 14, 12:32 PM CDT	Special Weather Statement	LIX	Lafourche, Saint Charles, Terrebonne	28 min
Apr 14, 1:02 PM CDT	Special Weather Statement	LIX	Jefferson, Lafourche	28 min
Apr 14, 1:11 PM CDT	Special Marine Warning	LIX		64 min
Apr 14, 1:32 PM CDT	Special Weather Statement	LIX	Jefferson	28 min
Apr 14, 2:08 PM CDT	Special Marine Warning	LIX		67 min
Apr 14, 2:55 PM CDT	Special Marine Warning	LIX		65 min
Apr 14, 4:12 PM CDT	Special Weather Statement	LIX	Saint Tammany	33 min
Apr 14, 4:24 PM CDT	Special Marine Warning	LIX		96 min
Apr 14, 5:03 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	3 hr
Apr 14, 5:26 PM CDT	Special Marine Warning	LIX		105 min
Apr 14, 5:27 PM CDT	Special Weather Statement	LIX	Saint Charles	33 min
Apr 14, 6:21 PM CDT	Special Marine Warning	LIX		114 min
Apr 14, 6:24 PM CDT	Special Weather Statement	LIX	Jefferson	96 min
Apr 14, 6:39 PM CDT	Special Marine Warning	LIX		2 hr
Apr 14, 6:57 PM CDT	Special Marine Warning	LIX		2 hr
Apr 14, 7:17 AM CDT	Special Weather Statement	LIX	Wilkinson	58 min
Apr 14, 10:00 AM CDT	River Flood Warning	LIX	Jackson	8 days
Apr 14, 10:00 AM CDT	River Flood Warning	LIX	Harrison	5 days
Apr 14, 10:00 AM CDT	River Flood Warning	LIX	Harrison	5 days
Apr 14, 10:17 AM CDT	Special Weather Statement	LIX	Jackson	28 min

Nearby

Special Weather Statements in Louisiana, 2021 Every special weather statement 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; the sounding from the Mesonet's radiosonde archive.