Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

July 11, 2021Saint Charles Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Jul 11, 2021, 5:03 PM CDT for Saint Charles Parish, Louisiana. It was in force for 27 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: Jul 11, 2021, 5:03 PM CDT (22:03 UTC)
Expired: Jul 11, 2021, 5:30 PM CDT
In force: 27 min
Issued by: NWS New Orleans, LA

County Saint Charles Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.1 hours before the alert went out and 51 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: 2500 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 707 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 11, 4:09 PM CDT, 54 minutes earlier.

Area forecast discussion, Jul 11, 4:09 PM CDT, 54 minutes before

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In the hours before

Local storm report, Jul 11, 2:35 PM CDT, 2 hours 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
235 PM CDT SUN JUL 11 2021

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

0215 PM     TSTM WND GST     1 NNE BOGALUSA          30.80N 89.85W
07/11/2021  E49 MPH          WASHINGTON         LA   AWOS

            BOGALUSA AWOS GUSTED TO 49MPH AT 2:15PM CT.

&&

MSW

Special weather statement, Jul 11, 3:13 PM CDT, 1 hour 50 minutes before

Special Weather Statement
National Weather Service New Orleans LA
313 PM CDT Sun Jul 11 2021

LAZ072-075-112130-
Northwest St. Tammany-Southern Tangipahoa-
313 PM CDT Sun Jul 11 2021

...A STRONG THUNDERSTORMS WILL AFFECT NORTHWESTERN ST. TAMMANY AND
SOUTHERN TANGIPAHOA PARISHES...

At 313 PM CDT, a strong thunderstorm was located near Robert, or 10
miles east of Hammond, moving northeast at 20 mph.

Winds in excess of 30 mph and frequent cloud to ground lightning
is possible with these storms.

Locations impacted include...
Hammond, Covington, Ponchatoula, Abita Springs, Madisonville, Folsom,
Springfield, Natalbany, Robert and Tickfaw.

This includes the following Interstates...
 Interstate 12 between mile markers 35 and 68.
 Interstate 55 in Louisiana between mile markers 15 and 39.

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 3035 8998 3034 9005 3037 9010 3039 9021
      3030 9030 3029 9041 3032 9042 3033 9047
      3036 9048 3036 9051 3040 9051 3043 9055
      3061 9057 3068 9013
TIME...MOT...LOC 2013Z 239DEG 15KT 3047 9029

CAB

Special weather statement, Jul 11, 3:52 PM CDT, 1 hour 11 minutes before

Special Weather Statement
National Weather Service New Orleans LA
352 PM CDT Sun Jul 11 2021

LAZ049-050-057-058-060-112130-
St. Charles-Livingston-Ascension-St. John The Baptist-St. James-
352 PM CDT Sun Jul 11 2021

...A STRONG THUNDERSTORM WILL AFFECT ST. JOHN THE BAPTIST...CENTRAL
ASCENSION...NORTHERN ST. JAMES...NORTHWESTERN ST. CHARLES AND
SOUTHEASTERN LIVINGSTON PARISHES...

At 352 PM CDT, a strong thunderstorm was located near Laplace, moving
east at 20 mph.

Winds in excess of 30 mph and frequent cloud to ground lightning
is possible with this storm.

Locations impacted include...
Gonzales, Reserve, Laplace, Hahnville, Gramercy, Lutcher, Sorrento,
Killona, Norco, Montz, Edgard, Garyville, Wallace, Taft, New Sarpy,
St. Rose, Destrehan and North Vacherie.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 179 and 213, and
between mile markers 215 and 221.
 Interstate 55 in Louisiana between mile markers 1 and 13.
 Interstate 310 between mile markers 1 and 4.

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 3025 9059 3022 9057 3019 9060 3017 9057
      3017 9050 3020 9045 3027 9041 3029 9032
      3019 9043 3012 9043 3006 9038 3005 9028
      2996 9029 3004 9088 3021 9094
TIME...MOT...LOC 2052Z 260DEG 18KT 3012 9048

CAB

Special weather statement, Jul 11, 3:55 PM CDT, 1 hour 8 minutes before

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Local storm report, Jul 11, 4:26 PM CDT, 37 minutes before

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Special weather statement, Jul 11, 5:03 PM CDT, 0 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 11, 7:36 AM CDT	Special Weather Statement	LIX	Saint James	39 min
Jul 11, 10:13 AM CDT	Special Weather Statement	LIX	Orleans	47 min
Jul 11, 10:18 AM CDT	Special Marine Warning	LIX		48 min
Jul 11, 11:07 AM CDT	Special Marine Warning	LIX		83 min
Jul 11, 11:09 AM CDT	Special Weather Statement	LIX	Orleans	36 min
Jul 11, 11:10 AM CDT	Special Weather Statement	LIX	Terrebonne	35 min
Jul 11, 12:47 PM CDT	Special Weather Statement	LIX	Saint Helena, Tangipahoa	58 min
Jul 11, 1:25 PM CDT	Special Weather Statement	LIX	Washington	80 min
Jul 11, 1:37 PM CDT	Special Weather Statement	LIX	Washington	68 min
Jul 11, 1:58 PM CDT	Areal Flood Advisory	LIX	Saint Tammany, Tangipahoa, Washington	2 hr
Jul 11, 2:19 PM CDT	Special Weather Statement	LIX	East Baton Rouge, West Baton Rouge	71 min
Jul 11, 2:27 PM CDT	Areal Flood Advisory	LIX	East Baton Rouge, Livingston, Saint Helena, West Baton Rouge	99 min
Jul 11, 3:13 PM CDT	Special Weather Statement	LIX	Tangipahoa	77 min
Jul 11, 3:15 PM CDT	Special Marine Warning	LIX		90 min
Jul 11, 3:52 PM CDT	Special Weather Statement	LIX	Ascension, Saint John the Baptist	38 min
Jul 11, 3:55 PM CDT	Special Weather Statement	LIX	Saint Tammany	65 min
Jul 11, 4:02 PM CDT	Special Marine Warning	LIX		58 min
Jul 11, 4:14 PM CDT	Special Marine Warning	LIX		61 min
Jul 11, 4:21 PM CDT	Areal Flood Advisory	LIX	Saint John the Baptist	89 min
Jul 11, 4:28 PM CDT	Areal Flood Advisory	LIX	Saint Tammany	93 min
Jul 11, 4:32 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Saint Bernard	40 min
Jul 11, 5:06 PM CDT	Special Marine Warning	LIX		54 min
Jul 11, 5:12 PM CDT	Flash Flood Warning	LIX	Jefferson, Orleans, Saint Bernard, Saint Charles	49 min
Jul 11, 6:08 PM CDT	Special Marine Warning	LIX		67 min
Jul 11, 6:47 PM CDT	Special Marine Warning	LIX		58 min
Jul 11, 11:30 AM CDT	Special Weather Statement	LIX	Hancock	60 min
Jul 11, 12:58 PM CDT	Special Weather Statement	LIX	Harrison, Jackson	2 hr
Jul 11, 2:33 PM CDT	Special Weather Statement	LIX	Pearl River	72 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.