Alert archive / Louisiana / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 93, NWS New Orleans, LA

July 16, 2020East Baton Rouge Parish, East Feliciana Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Jul 16, 2020, 1:39 PM CDT for East Baton Rouge Parish, East Feliciana Parish, Louisiana. It was in force for 36 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 16, 2020, 1:39 PM CDT (18:39 UTC)
Expired: Jul 16, 2020, 2:15 PM CDT
In force: 36 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties East Baton Rouge Parish, LA, East Feliciana Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.7 hours before the alert went out and 140 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: 216 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 856 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jul 16, 12:32 PM CDT, 1 hour 7 minutes earlier.

Area forecast discussion, Jul 16, 12:32 PM CDT, 1 hour 7 minutes before

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In the hours before

Special weather statement, Jul 16, 10:02 AM CDT, 3 hours 37 minutes before

Special Weather Statement
National Weather Service New Orleans LA
1002 AM CDT Thu Jul 16 2020

LAZ049-050-057-058-060>064-069-070-072-161530-
Orleans-Lower Plaquemines-Upper St. Bernard-St.
Charles-Livingston-Ascension-Southern Tangipahoa-Lower St.
Bernard-St. John The Baptist-St. James-Upper Plaquemines-Upper
Jefferson-
1002 AM CDT Thu Jul 16 2020

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT ST. JOHN THE BAPTIST...
NORTHEASTERN ASCENSION...NORTHEASTERN ST. JAMES...SOUTHWESTERN ST.
BERNARD...NORTHERN ST. CHARLES...SOUTHWESTERN ORLEANS...SOUTHEASTERN
LIVINGSTON...SOUTHWESTERN TANGIPAHOA...NORTHWESTERN JEFFERSON AND
NORTHWESTERN PLAQUEMINES PARISHES...

At 1002 AM CDT, radar indicated strong thunderstorms were located
along a line extending from near Springfield to near Poydras to 14
miles southeast of Shell Beach. Movement was southwest at 20 mph.

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

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

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 2952 8974 3021 9094 3048 9056 3029 9031
      3018 9043 3006 9038 3003 9008 2970 8943
      2966 8945 2975 8953 2976 8958 2973 8959
      2976 8963 2975 8965 2969 8960 2968 8963
      2965 8952 2968 8967 2961 8973
TIME...MOT...LOC 1502Z 040DEG 16KT 3039 9055 2983 8981 2969 8955

24/RR

Special weather statement, Jul 16, 10:41 AM CDT, 2 hours 58 minutes before

Special Weather Statement
National Weather Service New Orleans LA
1041 AM CDT Thu Jul 16 2020

LAZ059>061-063-065>069-161645-
Lower Terrebonne-Lower Plaquemines-St. Charles-Upper Terrebonne-Lower
Jefferson-Lower Lafourche-Upper Lafourche-Upper Plaquemines-Upper
Jefferson-
1041 AM CDT Thu Jul 16 2020

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

At 1041 AM CDT, radar indicated strong thunderstorms were located
along a line extending from near Avondale to near Lafitte to 6 miles
northeast of Pointe A La Hache. Movement was southwest at 25 mph.

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

Locations impacted include...
Houma, Cut Off, Galliano, Avondale, Larose, Port Sulphur, Marrero,
Belle Chasse, Harahan, Westwego, Lockport, Golden Meadow, Jean
Lafitte, Mathews, Myrtle Grove, Pointe A La Hache, Montegut, Lafitte,
Bayou Gauche and Waggaman.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 2924 9000 2927 8997 2934 8999 2926 9005
      2932 9007 2931 9013 2927 9007 2937 9045
      2962 9075 2995 9023 2975 8999 2963 8963
      2940 8978 2942 8978 2934 8984 2936 8983
      2932 8987 2945 8982 2923 8999
TIME...MOT...LOC 1541Z 046DEG 21KT 2987 9022 2972 9004 2962 8969

24/RR

Special weather statement, Jul 16, 11:42 AM CDT, 1 hour 57 minutes before

Special Weather Statement
National Weather Service New Orleans LA
1142 AM CDT Thu Jul 16 2020

LAZ037-049-050-058-060-071-072-161730-
St. Charles-Livingston-Ascension-St. Helena-Northern
Tangipahoa-Southern Tangipahoa-St. John The Baptist-
1142 AM CDT Thu Jul 16 2020

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CENTRAL ST. JOHN THE
BAPTIST...EAST CENTRAL ASCENSION...NORTH CENTRAL ST. CHARLES...
SOUTHEASTERN ST. HELENA...EASTERN LIVINGSTON AND TANGIPAHOA
PARISHES...

At 1141 AM CDT, radar indicated strong thunderstorms were located
along a line extending from near Wilmer to 6 miles south of
Ponchatoula to 8 miles northeast of Laplace. Movement was west at 10
mph.

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

Locations impacted include...
Hammond, Reserve, Amite, Laplace, Ponchatoula, Amite City,
Independence, Roseland, Albany, Springfield, Montpelier, Edgard,
Wilmer, Natalbany, Robert, Garyville, Killian, Tangipahoa and
Tickfaw.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 3081 9029 3077 9027 3034 9038 3026 9034
      3022 9040 3018 9043 3011 9043 3006 9037
      3005 9031 3003 9056 3037 9074 3090 9059
TIME...MOT...LOC 1641Z 095DEG 8KT 3074 9036 3035 9047 3014 9036

24/RR

Special weather statement, Jul 16, 12:13 PM CDT, 1 hour 26 minutes before

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Special weather statement, Jul 16, 12:34 PM CDT, 1 hour 5 minutes before

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Special weather statement, Jul 16, 1:25 PM CDT, 14 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 15, 7:02 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa, Washington	28 min
Jul 15, 7:19 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	3 hr
Jul 15, 7:30 PM CDT	Severe Thunderstorm Warning	LIX	Saint John the Baptist, Saint Tammany, Tangipahoa, Washington	45 min
Jul 15, 7:37 PM CDT	Special Marine Warning	LIX		83 min
Jul 15, 7:53 PM CDT	Special Weather Statement	LIX	Orleans, Saint Tammany	52 min
Jul 15, 8:01 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	14 min
Jul 15, 8:30 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, Jefferson, Livingston, Saint Charles, Saint James, Saint John the Baptist and 1 more	45 min
Jul 15, 8:42 PM CDT	Tornado Warning	LIX	Saint Charles, Saint John the Baptist	18 min
Jul 15, 9:10 PM CDT	Special Marine Warning	LIX		20 min
Jul 15, 9:15 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Saint Charles, Saint John the Baptist, Terrebonne	45 min
Jul 15, 9:19 PM CDT	Special Weather Statement	LIX	Assumption, Saint James	26 min
Jul 15, 10:05 PM CDT	Special Weather Statement	LIX	Lafourche	40 min
Jul 16, 7:14 AM CDT	Special Marine Warning	LIX		31 min
Jul 16, 8:38 AM CDT	Special Marine Warning	LIX		37 min
Jul 16, 8:40 AM CDT	Special Marine Warning	LIX		35 min
Jul 16, 8:55 AM CDT	Areal Flood Advisory	LIX	Saint Tammany	2 hr
Jul 16, 9:09 AM CDT	Special Marine Warning	LIX		36 min
Jul 16, 9:33 AM CDT	Special Weather Statement	LIX	Orleans, Saint John the Baptist	27 min
Jul 16, 9:35 AM CDT	Special Marine Warning	LIX		25 min
Jul 16, 10:02 AM CDT	Special Weather Statement	LIX	Ascension, Saint Charles, Saint John the Baptist	28 min
Jul 16, 10:08 AM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	112 min
Jul 16, 10:39 AM CDT	Special Marine Warning	LIX		36 min
Jul 16, 10:41 AM CDT	Special Weather Statement	LIX	Jefferson, Lafourche	64 min
Jul 16, 11:13 AM CDT	Special Marine Warning	LIX		47 min
Jul 16, 11:19 AM CDT	Areal Flood Advisory	LIX	Jefferson, Saint Charles, Saint John the Baptist	116 min
Jul 16, 11:42 AM CDT	Special Weather Statement	LIX	Saint John the Baptist, Tangipahoa	48 min
Jul 16, 11:52 AM CDT	Tornado Warning	LIX	Saint John the Baptist	8 min
Jul 16, 12:13 PM CDT	Special Weather Statement	LIX	Livingston, Saint James, Saint John the Baptist	32 min
Jul 16, 12:26 PM CDT	Areal Flood Advisory	LIX	Ascension, East Baton Rouge, Livingston	2 hr
Jul 16, 12:34 PM CDT	Special Weather Statement	LIX	Ascension, Livingston	26 min
Jul 16, 1:25 PM CDT	Special Weather Statement	LIX	East Baton Rouge, East Feliciana, Iberville, West Baton Rouge	35 min
Jul 16, 1:59 PM CDT	Areal Flood Advisory	LIX	East Baton Rouge, East Feliciana, Saint Helena, West Feliciana	61 min
Jul 16, 2:18 PM CDT	Special Weather Statement	LIX	East Feliciana	27 min
Jul 16, 2:19 PM CDT	Special Weather Statement	LIX	East Feliciana	26 min
Jul 16, 2:35 PM CDT	Severe Thunderstorm Warning	LIX	West Feliciana	25 min
Jul 16, 2:39 PM CDT	Areal Flood Advisory	LIX	East Feliciana, Saint Helena, West Feliciana	53 min
Jul 16, 3:06 PM CDT	Special Weather Statement	LIX	Pointe Coupee, West Feliciana	54 min
Jul 16, 3:51 PM CDT	Special Weather Statement	LIX	Pointe Coupee	24 min
Jul 15, 7:34 PM CDT	Special Weather Statement	LIX	Pike, Walthall	26 min
Jul 16, 2:24 PM CDT	Special Weather Statement	LIX	Wilkinson	51 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2020 Every severe thunderstorm warning in 2020

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.