Alert archive / Louisiana / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 202, NWS New Orleans, LA

December 4, 2005Washington Parish, Louisiana; Walthall County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Dec 4, 2005, 4:49 PM CST for Washington Parish, Louisiana; Walthall County, Mississippi. It was in force for 41 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: Dec 4, 2005, 4:49 PM CST (22:49 UTC)
Expired: Dec 4, 2005, 5:30 PM CST
In force: 41 min
Issued by: NWS New Orleans, LA
Area: Counties, with a storm outline in the text

Counties Washington Parish, LA, Walthall County, MS

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Dec 4, 11:39 AM CST	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.8 hours before the alert went out and 91 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: 207 J/kg
Mixed-layer CIN: -170 J/kg
Mixed-layer LCL: 917 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 Dec 4, 4:36 PM CST, 13 minutes earlier.

Area forecast discussion, Dec 4, 4:36 PM CST, 13 minutes before

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Hazardous weather outlook, Dec 4, 11:40 AM CST, 5 hours 9 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1140 AM CST SUN DEC 4 2005

LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-051200-
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-
1140 AM CST SUN DEC 4 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST
LOUISIANA AND SOUTHERN MISSISSIPPI.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

A STRONG COLD FRONT WILL MOVE THROUGH THE AREA THIS EVENING AND
TONIGHT. THIS FRONT WILL INTERACT WITH A VERY WARM AND MOIST AIRMASS
CURRENTLY IN PLACE ACROSS SOUTHEAST LOUISIANA AND SOUTH MISSISSIPPI.
AT THE SAME TIME...A STRONG UPPER LEVEL DISTURBANCE WILL MOVE INTO
THE REGION.  THESE CONDITIONS SHOULD ALLOW A LINE OF STRONG TO
LOCALLY SEVERE THUNDERSTORMS TO DEVELOP ALONG THE FRONTAL BOUNDARY.
THE LINE OF THUNDERSTORMS WILL PRIMARILY AFFECT THE AREA FROM BATON
ROUGE TO MCCOMB FROM LATE THIS AFTERNOON THROUGH EARLY TONIGHT...AND
THEN PUSH ACROSS THE REMAINDER OF SOUTHEAST LOUISIANA AND COASTAL
MISSISSIPPI AFTER MIDNIGHT.

THE MAIN THREAT FROM ANY SEVERE THUNDERSTORM DEVELOPMENT WILL BE
STRONG GUSTY WINDS...LARGE HAIL...FREQUENT LIGHTNING...AND LOCALLY
HEAVY RAINFALL.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY...

A LOW PRESSURE SYSTEM MAY DEVELOP IN THE WESTERN GULF OF MEXICO ON
TUESDAY...AND AFFECT THE REGION WEDNESDAY AND THURSDAY AS IT MOVES
THROUGH THE CENTRAL AND NORTHEAST GULF OF MEXICO. AT THE SAME TIME...
A STRONG SURFACE HIGH PRESSURE SYSTEM OVER THE CENTRAL AND EASTERN
UNITED STATES WILL REMAIN IN PLACE THROUGH THE END OF THE WEEK.  THE
INTERACTION BETWEEN THE LOW AND THE HIGH WILL ALLOW FOR A PERSISTENT
EAST WIND TO DEVELOP AND REMAIN IN PLACE THROUGH THURSDAY. THIS
EASTERLY FLOW WILL CAUSE TIDES TO RISE ABOVE NORMAL ON EAST FACING
SHORES AND THE TIDAL LAKES BY LATE WEDNESDAY OR THURSDAY.

NO HAZARDOUS WEATHER IS EXPECTED FRIDAY AND SATURDAY.

.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.

8

In the hours before

Local storm report, Dec 4, 2:29 PM CST, 2 hours 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
229 PM CST SUN DEC 04 2005

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

0207 PM     TSTM WND DMG     4 NW CLINTON            30.90N 91.06W
12/04/2005                   EAST FELICIANA     LA   LAW ENFORCEMENT

            DAMAGE TO A BARN AND THE ROOF OF A HOUSE IN WILSON.

&&

MTS

Local storm report, Dec 4, 4:16 PM CST, 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
416 PM CST SUN DEC 04 2005

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

0408 PM     HAIL             LIBERTY                 31.16N 90.80W
12/04/2005  0.75 INCH        AMITE              MS   LAW ENFORCEMENT

            DIME TO PENNY SIZE HAIL WAS REPORTED.

&&

MTS

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 4, 12:41 PM CST	Severe Thunderstorm Warning	LIX	West Feliciana	49 min
Dec 4, 1:33 PM CST	Severe Thunderstorm Warning	LIX	East Feliciana	42 min
Dec 4, 4:23 PM CST	Severe Thunderstorm Warning	LIX	Saint Helena, Tangipahoa	37 min
Dec 4, 2:54 PM CST	Severe Thunderstorm Warning	LIX	Wilkinson	36 min
Dec 4, 3:28 PM CST	Severe Thunderstorm Warning	LIX	Pike, Walthall	47 min
Dec 4, 3:33 PM CST	Severe Thunderstorm Warning	LIX	Amite, Wilkinson	42 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2005 Severe Thunderstorm Warnings in Mississippi, 2005 Every severe thunderstorm warning in 2005

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.