Alert archive / Louisiana / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 42, NWS New Orleans, LA

February 24, 2013Ascension Parish, Saint James Parish, Saint John the Baptist Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Feb 24, 2013, 11:57 PM CST for Ascension Parish, Saint James Parish, Saint John the Baptist Parish, Louisiana. It was in force for 48 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: Feb 24, 2013, 11:57 PM CST (05:57 UTC)
Expired: Feb 25, 2013, 12:45 AM CST
In force: 48 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Ascension Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 6.0 hours before the alert went out and 100 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: 902 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

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 Feb 24, 11:39 PM CST, 18 minutes earlier.

Area forecast discussion, Feb 24, 11:39 PM CST, 18 minutes before

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Hazardous weather outlook, Feb 24, 11:48 PM CST, 9 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1148 PM CST SUN FEB 24 2013

GMZ530-532-534-536-538-550-552-555-557-570-572-575-577-LAZ034>037-
039-040-046>050-056>072-MSZ068>071-077-080>082-251800-
LAKE PONTCHARTRAIN AND LAKE MAUREPAS-MISSISSIPPI SOUND-
LAKE BORGNE-CHANDELEUR SOUND-BRETON SOUND-
COASTAL WATERS FROM PORT FOURCHON TO LOWER ATCHAFALAYA RIVER OUT
20 NM-
COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER
TO PORT FOURCHON OUT 20 NM-
COASTAL WATERS FROM BOOTHVILLE LA TO THE SOUTHWEST PASS OF THE
MISSISSIPPI RIVER OUT 20 NM-
COASTAL WATERS FROM PASCAGOULA MS TO STAKE ISLAND LA OUT 20 NM-
COASTAL WATERS FROM PORT FOURCHON TO LOWER ATCHAFALAYA RIVER FROM
20 TO 60 NM-
COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER
TO PORT FOURCHON FROM 20 TO 60 NM-
COASTAL WATERS FROM STAKE ISLAND LA TO THE SOUTHWEST PASS OF THE
MISSISSIPPI RIVER FROM 20 TO 60 NM-
COASTAL WATERS FROM PASCAGOULA MS TO STAKE ISLAND LA FROM 20 TO
60 NM-POINTE COUPEE-WEST FELICIANA-EAST FELICIANA-ST. HELENA-
WASHINGTON-ST. TAMMANY-IBERVILLE-WEST BATON ROUGE-
EAST BATON ROUGE-ASCENSION-LIVINGSTON-ASSUMPTION-ST. JAMES-
ST. JOHN THE BAPTIST-UPPER LAFOURCHE-ST. CHARLES-UPPER JEFFERSON-
ORLEANS-UPPER PLAQUEMINES-UPPER ST. BERNARD-UPPER TERREBONNE-
LOWER TERREBONNE-LOWER LAFOURCHE-LOWER JEFFERSON-
LOWER PLAQUEMINES-LOWER ST. BERNARD-NORTHERN TANGIPAHOA-
SOUTHERN TANGIPAHOA-WILKINSON-AMITE-PIKE-WALTHALL-PEARL RIVER-
HANCOCK-HARRISON-JACKSON-
1148 PM CST SUN FEB 24 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST
LOUISIANA...SOUTH MISSISSIPPI AND THE ADJACENT COASTAL WATERS.

.DAY ONE...TONIGHT

SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP ACROSS SOUTHEAST
LOUISIANA AND SOUTH MISSISSIPPI. A FEW OF THE STORMS WILL BECOME
SEVERE AND PRODUCE HAIL UP TO GOLFBALL SIZE AND DAMAGING WINDS.
AFTER 3 AM... A WARM FRONT WILL START TO MOVE INLAND ALONG THE
SOUTHEAST LOUISIANA COAST. ANY STORMS THAT CAN DEVELOP NEAR OR
SOUTH OF THIS FRONT WILL HAVE THE POTENTIAL TO PRODUCE ISOLATED
TORNADOES OR WATERSPOUTS.

A FLASH FLOOD WATCH IS IN EFFECT FOR MUCH OF EAST CENTRAL AND
SOUTHEAST LOUISIANA...AND SOUTH MISSISSIPPI. FLASH FLOODING WILL
BE POSSIBLE WHERE REPEAT HEAVY RAIN OCCURS.

MULTIPLE RIVER FLOOD WARNINGS REMAIN IN EFFECT ACROSS THE AREA.
REFER TO THE LATEST RIVER FLOOD WARNINGS AND STATEMENTS FOR
DETAILS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE OUTLOOK
AREA ON MONDAY AS THE FRONT MOVES THROUGH THE AREA. ALL MODES OF
SEVERE WEATHER ARE POSSIBLE MONDAY AND MONDAY EVENING INCLUDING
DAMAGING WINDS...LARGE HAIL...AND ISOLATED TORNADOES. IN ADDITION
TO THE SEVERE WEATHER THREAT...HEAVY RAINFALL IS LIKELY WITH
ANOTHER 2 TO 4 INCHES EXPECTED ACROSS MUCH OF THE AREA WITH
LOCALLY HIGHER AMOUNTS POSSIBLE.

PLEASE REFER TO THE LATEST RIVER FLOOD STATEMENTS FOR ONGOING
FLOODING AT SEVERAL LOCATIONS THROUGH THE OUTLOOK PERIOD.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND
EMERGENCY MANAGEMENT PERSONNEL MAY BE NEEDED LATE TONIGHT THROUGH
MONDAY EVENING.

22/TD

In the hours before

Local storm report, Feb 24, 9:35 PM CST, 2 hours 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
935 PM CST SUN FEB 24 2013

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

0930 PM     HAIL             CHALMETTE               29.94N 89.97W
02/24/2013  E0.88 INCH       ST. BERNARD        LA   NWS EMPLOYEE

            NWS EMPLOYEE REPORTS NICKEL SIZED HAIL IN CHALMETTE.

&&

JS

Local storm report, Feb 24, 10:00 PM CST, 1 hour 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1000 PM CST SUN FEB 24 2013

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

0915 PM     HAIL             MARRERO                 29.89N 90.11W
02/24/2013  E2.50 INCH       JEFFERSON          LA   PUBLIC

            FACEBOOK PICTURE INDICATES OBLONG SHAPED HAIL STONE IN
            PERSONS HAND WITH SIZE OF ABOUT 2.25 TO 2.5 INCHES.

&&

TD

Local storm report, Feb 24, 10:22 PM CST, 1 hour 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1022 PM CST SUN FEB 24 2013

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

0918 PM     HAIL             VIOLET                  29.90N 89.89W
02/24/2013  E1.50 INCH       ST. BERNARD        LA   PUBLIC

&&

TD

Local storm report, Feb 24, 10:23 PM CST, 1 hour 34 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1023 PM CST SUN FEB 24 2013

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

0735 PM     HAIL             11 W GRAY               29.68N 90.96W
02/24/2013  E1.75 INCH       TERREBONNE         LA   EMERGENCY MNGR

            GOLFBALL SIZE HAIL REPORTED IN GIBSON/BAYOU BLACK AREA.

0737 PM     HAIL             GRAY                    29.68N 90.78W
02/24/2013  E1.00 INCH       TERREBONNE         LA   PUBLIC

            HAIL LASTED 15 TO 20 MINUTES. REPORT FROM FACEBOOK.

0832 PM     TSTM WND DMG     MATHEWS                 29.69N 90.56W
02/24/2013                   LAFOURCHE          LA   EMERGENCY MNGR

            POWER LINES DOWN. SHED DESTROYED. POSSIBLE TORNADO.

0835 PM     HAIL             4 SE DES ALLEMANDS      29.79N 90.38W
02/24/2013  E0.50 INCH       ST. CHARLES        LA   EMERGENCY MNGR

            HALF INCH SIZE HAIL REPORTED IN BAYOU GAUCHE AREA.

0840 PM     HAIL             DES ALLEMANDS           29.83N 90.43W
02/24/2013  E1.00 INCH       ST. CHARLES        LA   PUBLIC

            PUBLIC REPORTS QUARTER SIZED HAIL IN DES ALLEMANDS.

0910 PM     HAIL             GRETNA                  29.91N 90.05W
02/24/2013  E0.75 INCH       JEFFERSON          LA   PUBLIC

            PENNY SIZED HAIL REPORTED IN GRETNA.

0915 PM     HAIL             MARRERO                 29.89N 90.11W
02/24/2013  E2.50 INCH       JEFFERSON          LA   PUBLIC

            FACEBOOK PICTURE INDICATES OBLONG SHAPED HAIL STONE IN
            PERSONS HAND WITH SIZE OF ABOUT 2.25 TO 2.5 INCHES.

0915 PM     HAIL             MARRERO                 29.89N 90.11W
02/24/2013  E1.75 INCH       JEFFERSON          LA   FIRE DEPT/RESCUE

            FIRE STATION 86 NEAR LAPALCO AND WESTWOOD REPORTED
            GOLFBALL SIZE HAIL.

0915 PM     HAIL             2 SW NEW ORLEANS        29.95N 90.11W
02/24/2013  E1.00 INCH       ORLEANS            LA   NWS EMPLOYEE

            QUARTER SIZED HAIL REPORTED IN THE LOWER GARDEN DISTRICT.

0915 PM     HAIL             TERRYTOWN               29.90N 90.03W
02/24/2013  E1.50 INCH       JEFFERSON          LA   CO-OP OBSERVER

            NWS CO-OP OBSERVER REPORTS PING PONG BALL SIZED HAIL A
            TERRYTONW.

0918 PM     HAIL             VIOLET                  29.90N 89.89W
02/24/2013  E1.50 INCH       ST. BERNARD        LA   PUBLIC

0930 PM     HAIL             CHALMETTE               29.94N 89.97W
02/24/2013  E0.88 INCH       ST. BERNARD        LA   NWS EMPLOYEE

            NWS EMPLOYEE REPORTS NICKEL SIZED HAIL IN CHALMETTE.

&&

TD

Special weather statement, Feb 24, 10:55 PM CST, 1 hour 2 minutes before

LAZ046-049-050-250600-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1055 PM CST SUN FEB 24 2013

...STRONG THUNDERSTORM MOVING NORTHEAST AFFECTING ASCENSION PARISH...
LIVINGSTON PARISH...IBERVILLE PARISH...

AT 1050 PM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM 8 MILES NORTHWEST OF DONALDSONVILLE...OR ABOUT
OVER WHITE CASTLE...MOVING NORTHEAST AT 30 MPH.

THE STRONG THUNDERSTORM WILL AFFECT AREAS IN AND AROUND...
DONALDSONVILLE...CARVILLE...GEISMER...GONZALES...SORRENTO...
PRAIRIEVILLE...WHITEHALL...LIVINGSTON AND KILLIAN

THE PRIMARY THREATS FROM THIS STORM ARE FREQUENT LIGHTNING AND SUB
SEVERE HAIL UP TO NICKEL SIZE. SEEK SHELTER IN A SAFE HOME OR
BUILDING UNTIL THIS STORM HAS PASSED.

FREQUENT LIGHTNING IS OCCURRING WITH THIS STORM. IF OUTDOORS...STAY
AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF
POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID
USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY
ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.

Special weather statement, Feb 24, 11:26 PM CST, 31 minutes before

LAZ056-057-250630-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1126 PM CST SUN FEB 24 2013

...STRONG THUNDERSTORM MOVING NORTHEAST AFFECTING ST. JAMES PARISH...
ASSUMPTION PARISH...

AT 1122 PM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM 9 MILES NORTH OF STEPHENSVILLE...OR ABOUT 4 MILES
SOUTH OF PIERRE PART...MOVING NORTHEAST AT 25 MPH.

THE STRONG THUNDERSTORM WILL AFFECT AREAS IN AND AROUND...
PAINCOURTVILLE...NAPOLEONVILLE...CONVENT...LUTCHER AND GRAMERCY

THE PRIMARY THREATS FROM THIS STORM ARE FREQUENT LIGHTNING AND SUB
SEVERE HAIL UP TO NICKEL SIZE. SEEK SHELTER IN A SAFE HOME OR
BUILDING UNTIL THIS STORM HAS PASSED.

FREQUENT LIGHTNING IS OCCURRING WITH THIS STORM. IF OUTDOORS...STAY
AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF
POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID
USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY
ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 24, 6:14 PM CST	Severe Thunderstorm Warning	LIX	Lafourche, Saint Charles, Saint John the Baptist	31 min
Feb 24, 6:30 PM CST	Severe Thunderstorm Warning	LIX	Jefferson, Plaquemines, Saint Bernard	45 min
Feb 24, 6:41 PM CST	Severe Thunderstorm Warning	LIX	Jefferson, Saint Charles	49 min
Feb 24, 6:45 PM CST	Severe Thunderstorm Warning	LIX	Assumption, Lafourche, Terrebonne	45 min
Feb 24, 6:57 PM CST	Special Marine Warning	LIX		63 min
Feb 24, 7:02 PM CST	Severe Thunderstorm Warning	LIX	Saint John the Baptist	28 min
Feb 24, 7:10 PM CST	Special Marine Warning	LIX		50 min
Feb 24, 7:23 PM CST	Severe Thunderstorm Warning	LIX	Lafourche, Terrebonne	52 min
Feb 24, 7:41 PM CST	Severe Thunderstorm Warning	LIX	Assumption, Lafourche, Saint James, Terrebonne	49 min
Feb 24, 7:56 PM CST	Special Marine Warning	LIX		64 min
Feb 24, 8:08 PM CST	Severe Thunderstorm Warning	LIX	Lafourche, Saint Charles, Saint John the Baptist	52 min
Feb 24, 8:52 PM CST	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles	38 min
Feb 24, 8:58 PM CST	Special Marine Warning	LIX		62 min
Feb 24, 9:26 PM CST	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	34 min
Feb 24, 9:36 PM CST	Special Marine Warning	LIX		54 min
Feb 24, 9:45 PM CST	Special Marine Warning	LIX		45 min
Feb 24, 9:56 PM CST	Severe Thunderstorm Warning	LIX	Saint Bernard	34 min
Feb 24, 10:07 PM CST	Severe Thunderstorm Warning	LIX	Saint Tammany	38 min
Feb 24, 10:14 PM CST	River Flood Warning	LIX	Tangipahoa	3 days
Feb 24, 10:21 PM CST	Areal Flood Advisory	LIX	Ascension, East Baton Rouge, Iberville, West Baton Rouge	114 min
Feb 24, 11:04 PM CST	Special Marine Warning	LIX		56 min
Feb 24, 11:17 PM CST	Severe Thunderstorm Warning	LIX	Ascension, Livingston	28 min
Feb 24, 11:28 PM CST	Severe Thunderstorm Warning	LIX	Ascension, Assumption, Iberville, Saint James	32 min
Feb 24, 11:44 PM CST	Severe Thunderstorm Warning	LIX	Livingston, Tangipahoa	46 min
Feb 25, 12:02 AM CST	Special Marine Warning	LIX		28 min
Feb 25, 12:04 AM CST	Special Marine Warning	LIX		41 min
Feb 25, 12:29 AM CST	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa	46 min
Feb 25, 12:49 AM CST	Special Marine Warning	LIX		26 min
Feb 25, 3:06 AM CST	Areal Flood Advisory	LIX	Jefferson, Orleans	114 min
Feb 25, 3:11 AM CST	Severe Thunderstorm Warning	LIX	Ascension, Livingston, Saint James, Saint John the Baptist	34 min
Feb 25, 3:12 AM CST	Gale Warning	LIX		30 hr
Feb 25, 3:12 AM CST	Small Craft Advisory	LIX		21 hr
Feb 25, 3:42 AM CST	Severe Thunderstorm Warning	LIX	Livingston, Saint John the Baptist, Saint Tammany, Tangipahoa	33 min
Feb 25, 3:55 AM CST	River Flood Warning	LIX	Saint Tammany	3 days
Feb 25, 3:55 AM CST	Special Marine Warning	LIX		50 min
Feb 25, 4:15 AM CST	Flash Flood Warning	LIX	Saint Tammany	3 hr
Feb 25, 4:32 AM CST	Areal Flood Advisory	LIX	Saint Tammany, Tangipahoa	58 min
Feb 25, 4:43 AM CST	Wind Advisory	LIX	Saint Bernard, Saint John the Baptist	34 hr
Feb 25, 4:48 AM CST	Special Marine Warning	LIX		87 min
Feb 25, 5:01 AM CST	River Flood Warning	LIX	Saint Tammany	52 hr
Feb 25, 5:02 AM CST	Special Marine Warning	LIX		28 min
Feb 25, 6:22 AM CST	River Flood Warning	LIX	Saint Tammany	3 days
Feb 25, 6:23 AM CST	River Flood Warning	LIX	Saint Tammany	33 hr
Feb 25, 2:24 PM CST	Severe Thunderstorm Warning	LIX	Ascension, East Baton Rouge, Iberville, Livingston, Tangipahoa	51 min
Feb 25, 2:26 PM CST	Severe Thunderstorm Warning	LIX	Saint Tammany, Washington	49 min
Feb 25, 3:07 PM CST	Special Marine Warning	LIX		23 min
Feb 25, 3:07 PM CST	Severe Thunderstorm Warning	LIX	West Feliciana	38 min
Feb 25, 3:26 PM CST	Special Marine Warning	LIX		19 min
Feb 25, 3:29 PM CST	Severe Thunderstorm Warning	LIX	Lafourche, Terrebonne	46 min
Feb 25, 5:00 PM CST	Special Marine Warning	LIX		45 min
Feb 25, 5:29 PM CST	Special Marine Warning	LIX		91 min
Feb 25, 5:31 PM CST	Special Marine Warning	LIX		44 min
Feb 25, 5:40 PM CST	Tornado Warning	LIX	Jefferson, Plaquemines	35 min
Feb 25, 12:22 AM CST	Severe Thunderstorm Warning	LIX	Jackson	23 min
Feb 25, 2:40 AM CST	Severe Thunderstorm Warning	LIX	Harrison, Jackson	35 min
Feb 25, 3:17 AM CST	Severe Thunderstorm Warning	LIX	Harrison, Jackson	43 min
Feb 25, 3:28 AM CST	Severe Thunderstorm Warning	LIX	Jackson	62 min
Feb 25, 8:21 AM CST	River Flood Warning	LIX	Harrison	50 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 2013 Every severe thunderstorm warning in 2013

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.