Alert archive / Louisiana / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 156, NWS New Orleans, LA

July 6, 2004Washington Parish, Louisiana; Pearl River County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Jul 6, 2004, 3:51 PM CDT for Washington Parish, Louisiana; Pearl River County, Mississippi. It was in force for 24 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 6, 2004, 3:51 PM CDT (20:51 UTC)
Expired: Jul 6, 2004, 4:15 PM CDT
In force: 24 min
Issued by: NWS New Orleans, LA
Area: Counties, with a storm outline in the text

Counties Washington Parish, LA, Pearl River County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.9 hours before the alert went out and 63 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: 2155 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 821 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -36 m²/s²
0-3 km storm-relative helicity: -29 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 6, 3:15 PM CDT, 36 minutes earlier.

Area forecast discussion, Jul 6, 3:15 PM CDT, 36 minutes before

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Hazardous weather outlook, Jul 6, 11:45 AM CDT, 4 hours 6 minutes before

HAZARDOUS WEATHER OUTLOOK...RETRANSMITTAL
NATIONAL WEATHER SERVICE NEW ORLEANS LA
ISSUED BY NATIONAL WEATHER SERVICE MOBILE AL
1145 AM CDT TUE JUL 6 2004

LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-071100-
AMITE-ASCENSION-ASSUMPTION-EAST BATON ROUGE-EAST FELICIANA-HANCOCK-
HARRISON-IBERVILLE-JACKSON-LIVINGSTON-LOWER JEFFERSON-
LOWER LAFOURCHE-LOWER PLAQUEMINES-LOWER ST BERNARD-LOWER TERREBONNE-
ORLEANS-PEARL RIVER-PIKE-POINTE COUPEE-ST CHARLES-ST HELENA-ST JAMES-
ST JOHN THE BAPTIST-ST TAMMANY-TANGIPAHOA-UPPER JEFFERSON-
UPPER LAFOURCHE-UPPER PLAQUEMINES-UPPER ST BERNARD-UPPER TERREBONNE-
WALTHALL-WASHINGTON-WEST BATON ROUGE-WEST FELICIANA-WILKINSON-
1145 AM CDT TUE JUL 6 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL AND SOUTHEAST
LOUISIANA AND EXTREME SOUTHWEST...SOUTH CENTRAL AND COASTAL
MISSISSIPPI.

.DAY ONE...THIS AFTERNOON AND TONIGHT

SCATTERED THUNDERSTORMS ARE EXPECTED TO OCCUR TODAY. A FEW STORMS
WILL PRODUCE WIND GUSTS TO AROUND 45 MPH...IN ADDITION TO FREQUENT
LIGHTNING STRIKES...HEAVY RAINS TOTALING NEAR 2 INCHES PER
HOUR...AND POSSIBLE SOME SMALL HAIL.  AN ISOLATED STORM MAY BRIEFLY
INCREASE TO SEVERE LIMITS...WITH WIND GUSTS IN EXCESS OF 57
MPH...AND LARGE HAIL.  WIDESPREAD...ORGANIZED SEVERE WEATHER IS NOT
EXPECTED THROUGH TONIGHT.

STAY TUNED FOR FURTHER UPDATES FROM THE NATIONAL WEATHER SERVICE.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

THUNDERSTORM COVERAGE WILL INCREASE WEDNESDAY THROUGH FRIDAY AND
BEGIN A DECLINE TO MORE TYPICAL COVERAGES OVER THE WEEKEND.
ORGANIZED SEVERE WEATHER IS NOT EXPECTED...HOWEVER ISOLATED STRONG
TO SEVERE THUNDERSTORMS ARE POSSIBLE EACH DAY.

.SPOTTER INFORMATION STATEMENT...

THE ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS AND EMERGENCY
MANAGEMENT PERSONNEL...IN SUPPORT OF SEVERE WEATHER OPERATIONS...IS
NOT REQUESTED AT THIS TIME.

In the hours before

Special weather statement, Jul 6, 1:25 PM CDT, 2 hours 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
125 PM CDT TUE JUL 6 2004

LAZ057>064-067>070-062000-
LOWER JEFFERSON-LOWER LAFOURCHE-LOWER PLAQUEMINES-LOWER ST BERNARD-
ORLEANS-ST CHARLES-ST JAMES-ST JOHN THE BAPTIST-UPPER JEFFERSON-
UPPER LAFOURCHE-UPPER PLAQUEMINES-UPPER ST BERNARD-
125 PM CDT TUE JUL 6 2004

...SCATTERED STRONG THUNDERSTORMS OVER SOUTHEAST LOUISIANA...

AT 115 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG
THUNDERSTORMS SCATTERED FROM THE JUST WEST OF LAPLACE ACROSS ST.
CHARLES PARISH TO THE NEW ORLEANS AREA THEN SOUTH TO NEAR RACELAND.
THUNDERSTORMS WERE MOVING NORTHEAST AROUND 15 MPH.

THE PRIMARY THREATS FROM THIS STORMS ARE DANGEROUS CLOUD TO GROUND
LIGHTNING...TORRENTIAL RAINFALL...SMALL HAIL...AND WIND GUSTS OF 35
TO 45 MPH. STRONG WIND GUSTS MAY DOWN SMALL TREE LIMBS OR BRANCHES
AND BLOW AROUND UNSECURED SMALL OBJECTS. SEEK SHELTER IN A SAFE HOME
OR BUILDING UNTIL THESE STORMS HAVE PASSED.

STAY TUNED TO NOAA WEATHER RADIO...LOCAL MEDIA...AND CABLE
TELEVISION PROVIDERS FOR LATER STATEMENTS AND POSSIBLE WARNINGS ON
THESE THUNDERSTORMS.

Local storm report, Jul 6, 1:31 PM CDT, 2 hours 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
131 PM CDT TUE JUL 06 2004

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

0100 PM     TSTM WND DMG     SCHRIEVER               29.74N 90.83W
07/06/2004                   TERREBONNE         LA   EMERGENCY MNGR

            TSTM WIND DAMAGE OR POSSIBLE TORNADO DOWNED TREES AND
            DAMAGED TRAILERS. EMERGENCY MANAGER ON SCENE AND
            INVESTIGATING EXTENT OF DAMAGE.

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 1:39 PM CDT	Special Marine Warning	LIX		66 min
Jul 6, 1:49 PM CDT	Tornado Warning	LIX	Plaquemines, Saint Bernard	26 min
Jul 6, 1:52 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans	38 min
Jul 6, 2:20 PM CDT	Special Marine Warning	LIX		55 min
Jul 6, 3:21 PM CDT	Special Marine Warning	LIX		84 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2004 Severe Thunderstorm Warnings in Mississippi, 2004 Every severe thunderstorm warning in 2004

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.