Alert archive / Louisiana / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 150, NWS New Orleans, LA

November 30, 2010Plaquemines Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Nov 30, 2010, 9:03 AM CST for Plaquemines Parish, Louisiana. It was in force for 57 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 30, 2010, 9:03 AM CST (15:03 UTC)
Expired: Nov 30, 2010, 10:00 AM CST
In force: 57 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

County Plaquemines Parish, LA

The watch it was issued in

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

Issued	Product	Office	Lasted
Nov 30, 3:49 AM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.1 hours before the alert went out and 79 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: 1502 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 618 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 253 m²/s²
0-3 km storm-relative helicity: 274 m²/s²
Significant tornado parameter: 2.5
Supercell composite: 12.0

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 Nov 30, 7:26 AM CST, 1 hour 37 minutes earlier.

Area forecast discussion, Nov 30, 7:26 AM CST, 1 hour 37 minutes before

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Hazardous weather outlook, Nov 30, 7:34 AM CST, 1 hour 29 minutes before

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In the hours before

Special weather statement, Nov 30, 5:49 AM CST, 3 hours 14 minutes before

LAZ038>040-050-056>062-065>067-MSZ077-080-301345-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
549 AM CST TUE NOV 30 2010

...LINE OF STRONG THUNDERSTORMS MOVING EAST AFFECTING WASHINGTON
PARISH...LIVINGSTON PARISH...TANGIPAHOA PARISH...ST. JOHN THE BAPTIST
PARISH...ST. CHARLES PARISH...ASSUMPTION PARISH...ST. JAMES PARISH...
PEARL RIVER COUNTY...HANCOCK COUNTY...JEFFERSON PARISH...ORLEANS
PARISH...ST. TAMMANY PARISH...LAFOURCHE PARISH...TERREBONNE PARISH...

AT 545 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF STRONG THUNDERSTORMS FROM 15 MILES WEST OF COVINGTON TO 53
MILES SOUTHWEST OF HOUMA...MOVING EAST AT 25 MPH.

THE LINE OF STRONG THUNDERSTORMS WILL BE NEAR...
  ROBERT BY 555 AM...
  GARYVILLE BY 605 AM...
  FOLSOM AND THIBODAUX BY 610 AM...
  SCHRIEVER AND RESERVE BY 615 AM...
  EDGARD BY 625 AM...
  LAPLACE AND GRAY BY 635 AM...

THE PRIMARY THREAT FROM THESE STORMS IS WIND GUSTS TO NEAR 40 MPH...
WHICH COULD DOWN TREE LIMBS AND BLOW AROUND UNSECURED SMALL OBJECTS.
SEEK SHELTER IN A SAFE HOME OR BUILDING UNTIL THESE STORMS HAVE
PASSED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 AM TUESDAY MORNING FOR
SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

BE PREPARED TO TAKE QUICK ACTION IF A WARNING IS ISSUED. STAY TUNED
TO NOAA WEATHER RADIO OR YOUR FAVORITE LOCAL MEDIA OUTLETS FOR
FURTHER DETAILS OR UPDATES FROM THE NATIONAL WEATHER SERVICE.

24/RR

Special weather statement, Nov 30, 6:53 AM CST, 2 hours 10 minutes before

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Local storm report, Nov 30, 7:31 AM CST, 1 hour 32 minutes before

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Special weather statement, Nov 30, 7:38 AM CST, 1 hour 25 minutes before

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Special weather statement, Nov 30, 7:42 AM CST, 1 hour 21 minutes before

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Special weather statement, Nov 30, 8:20 AM CST, 43 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
Nov 30, 12:29 AM CST	Tornado Warning	LIX	Pointe Coupee, West Feliciana	46 min
Nov 30, 1:33 AM CST	Severe Thunderstorm Warning	LIX	East Feliciana, Pointe Coupee, West Feliciana	42 min
Nov 30, 2:15 AM CST	Severe Thunderstorm Warning	LIX	East Feliciana, West Feliciana	45 min
Nov 30, 2:32 AM CST	Tornado Warning	LIX	East Feliciana	28 min
Nov 30, 5:36 AM CST	Tornado Warning	LIX	Saint Tammany, Tangipahoa, Washington	24 min
Nov 30, 5:41 AM CST	Tornado Warning	LIX	Washington	34 min
Nov 30, 6:06 AM CST	Tornado Warning	LIX	Saint Tammany, Tangipahoa, Washington	24 min
Nov 30, 6:12 AM CST	Special Marine Warning	LIX		91 min
Nov 30, 6:19 AM CST	Tornado Warning	LIX	Washington	26 min
Nov 30, 6:30 AM CST	Tornado Warning	LIX	Saint Tammany	30 min
Nov 30, 6:39 AM CST	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles	66 min
Nov 30, 6:42 AM CST	Severe Thunderstorm Warning	LIX	Washington	29 min
Nov 30, 7:00 AM CST	Special Marine Warning	LIX		2 hr
Nov 30, 7:14 AM CST	Special Marine Warning	LIX		101 min
Nov 30, 8:12 AM CST	Special Marine Warning	LIX		33 min
Nov 30, 8:14 AM CST	Special Marine Warning	LIX		2 hr
Nov 30, 8:30 AM CST	Special Marine Warning	LIX		30 min
Nov 30, 8:51 AM CST	Special Marine Warning	LIX		54 min
Nov 30, 8:54 AM CST	Special Marine Warning	LIX		2 hr
Nov 30, 10:05 AM CST	Special Marine Warning	LIX		115 min
Nov 30, 10:10 AM CST	Special Marine Warning	LIX		103 min
Nov 30, 11:25 AM CST	Gale Warning	LIX		4 hr
Nov 30, 11:25 AM CST	Small Craft Advisory	LIX		23 hr
Nov 30, 11:51 AM CST	Special Marine Warning	LIX		114 min
Nov 29, 11:43 PM CST	Severe Thunderstorm Warning	LIX	Wilkinson	47 min
Nov 30, 12:01 AM CST	Tornado Warning	LIX	Wilkinson	44 min
Nov 30, 3:04 AM CST	Tornado Warning	LIX	Amite, Pike	41 min
Nov 30, 3:38 AM CST	Tornado Warning	LIX	Pike, Walthall	17 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2010 Every severe thunderstorm warning in 2010

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.