Alert archive / Louisiana / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 162, NWS New Orleans, LA

November 25, 2007Plaquemines Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Nov 25, 2007, 5:09 PM CST for Plaquemines Parish, Louisiana. It was in force for 51 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: Nov 25, 2007, 5:09 PM CST (23:09 UTC)
Expired: Nov 25, 2007, 6:00 PM CST
In force: 51 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

County Plaquemines Parish, LA

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.2 hours before the alert went out and 332 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: 462 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 402 m²/s²
0-3 km storm-relative helicity: 476 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 Nov 25, 3:35 PM CST, 1 hour 34 minutes earlier.

Area forecast discussion, Nov 25, 3:35 PM CST, 1 hour 34 minutes before

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Hazardous weather outlook, Nov 25, 10:15 AM CST, 6 hours 54 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1015 AM CST SUN NOV 25 2007

GMZ530-550-555-570-575-LAZ034>040-046>050-056>070-MSZ068>071-077-
080>082-261200-
LAKE PONTCHARTRAIN AND LAKE MAUREPAS-
COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER
TO LOWER ATCHAFALAYA RIVER LA OUT 20 NM-
COASTAL WATERS FROM PASCAGOULA MS TO THE SOUTHWEST PASS OF THE
MISSISSIPPI RIVER OUT 20 NM-
COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER
TO LOWER ATCHAFALAYA RIVER LA FROM 20 TO 60 NM-
COASTAL WATERS FROM PASCAGOULA MS TO THE SOUTHWEST PASS OF THE
MISSISSIPPI RIVER FROM 20 TO 60 NM-POINTE COUPEE-WEST FELICIANA-
EAST FELICIANA-ST. HELENA-TANGIPAHOA-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-WILKINSON-AMITE-PIKE-WALTHALL-PEARL RIVER-
HANCOCK-HARRISON-JACKSON-
1015 AM CST SUN NOV 25 2007

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

THUNDERSTORMS...
A STRONG STORM SYSTEM WILL BRING A WARM FRONT INLAND ACROSS EAST
CENTRAL AND SOUTHEAST LOUISIANA AND SOUTH MISSISSIPPI THIS
AFTERNOON. SEVERE WEATHER WILL BE POSSIBLE NEAR THE WARM FRONT WITH
THE MAIN THREAT BEING LARGE HAIL AND ISOLATED TORNADOES. AREAS OF
HEAVY RAIN ARE EXPECTED AS WELL TODAY...MAINLY WEST OF INTERSTATE 55
AND LAKE PONTCHARTRAIN.

THUNDERSTORMS...
AN AREA OF LOW PRESSURE WILL MOVE NORTHWARD ACROSS LOUISIANA AND
MISSISSIPPI TODAY WITH A COLD FRONT EXPECTED TO MOVE ACROSS THE
OUTLOOK AREA TONIGHT. THE THREAT OF SEVERE THUNDERSTORMS WILL
CONTINUE TONIGHT AHEAD OF THE COLD FRONT WITH THE THREAT OF
DAMAGING STRAIGHT LINE WINDS...LARGE HAIL...FREQUENT CLOUD TO
GROUND LIGHTNING...ISOLATED TORNADOES...AND HEAVY RAINFALL.

RAINFALL AMOUNTS OF 1 TO 3 INCHES WILL BE COMMON WITH THE HIGHEST
TOTALS EXPECTED WEST OF INTERSTATE 55 AND LAKE PONTCHARTRAIN...
WHERE LOCALLY HIGHER STORM TOTAL AMOUNTS OF 3 TO 4 INCHES WILL BE
POSSIBLE THROUGH TONIGHT. HEAVY PONDING OF WATER ON ROADWAYS IS
POSSIBLE ALONG WITH SOME FLOODING OF LOW LYING AND FLOOD PRONE
AREAS.

MARINE...
SMALL CRAFT ADVISORY CONDITIONS ARE EXPECTED TO CONTINUE THROUGH
TONIGHT ACROSS THE GULF COASTAL WATERS AS WINDS OF 20 TO 25 KNOTS
AND SEAS UP TO 9 FEET PREVAIL.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED MONDAY THROUGH FRIDAY.

.SPOTTER INFORMATION STATEMENT...
STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL SHOULD REMAIN
ON ALERT FOR POSSIBLE ACTIVATION TODAY AND TONIGHT.

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 25, 12:47 PM CST	Special Marine Warning	LIX		88 min
Nov 25, 1:32 PM CST	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche	43 min
Nov 25, 1:54 PM CST	Special Marine Warning	LIX		96 min
Nov 25, 2:06 PM CST	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	54 min
Nov 25, 2:13 PM CST	Special Marine Warning	LIX		62 min
Nov 25, 3:21 PM CST	Special Marine Warning	LIX		84 min
Nov 25, 4:29 PM CST	Special Marine Warning	LIX		91 min
Nov 25, 4:45 PM CST	Special Marine Warning	LIX		90 min
Nov 25, 5:51 PM CST	Special Marine Warning	LIX		84 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2007 Every severe thunderstorm warning in 2007

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.