Alert archive / Louisiana / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 49, NWS New Orleans, LA

March 21, 2012Saint Tammany Parish, Washington Parish, Louisiana; Hancock County, Pearl River County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Mar 21, 2012, 12:55 PM CDT for Saint Tammany Parish, Washington Parish, Louisiana; Hancock County, Pearl River County, Mississippi. It was in force for 65 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 21, 2012, 12:55 PM CDT (17:55 UTC)
Expired: Mar 21, 2012, 2:00 PM CDT
In force: 65 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Saint Tammany Parish, LA, Washington Parish, LA, Hancock County, MS, Pearl River 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
Mar 21, 10:07 AM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.9 hours before the alert went out and 27 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: 983 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 519 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 363 m²/s²
0-3 km storm-relative helicity: 421 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 10.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

514 
WUUS54 KLIX 211755
SVRLIX
LAC103-117-MSC045-109-211900-
/O.NEW.KLIX.SV.W.0049.120321T1755Z-120321T1900Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1255 PM CDT WED MAR 21 2012

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN ST. TAMMANY PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITIES OF...SLIDELL...EDEN ISLE...
  EASTERN WASHINGTON PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF BOGALUSA...
  HANCOCK COUNTY IN SOUTHERN MISSISSIPPI...
  THIS INCLUDES THE CITIES OF...WAVELAND...DIAMONDHEAD...
  PEARL RIVER COUNTY IN SOUTHERN MISSISSIPPI...
  THIS INCLUDES THE CITIES OF...POPLARVILLE...PICAYUNE...

* UNTIL 200 PM CDT

* AT 1248 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 9 MILES NORTH OF VARNADO TO LACOMBE...OR ALONG A LINE
  EXTENDING FROM 16 MILES SOUTH OF COLUMBIA TO 7 MILES WEST OF
  SLIDELL...AND MOVING EAST AT 25 MPH.



PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 600 PM CDT WEDNESDAY EVENING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 3036 8935 3035 8937 3029 8935 3025 8942
      3017 8946 3018 8948 3017 8956 3015 8957
      3017 8970 3022 8985 3024 8987 3025 8995
      3100 8990 3102 8950 3099 8943 3102 8942
      3101 8935
TIME...MOT...LOC 1755Z 287DEG 22KT 3101 8981 3029 8984

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 21, 7:34 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, Iberville, Livingston, Pointe Coupee, West Baton Rouge, West Feliciana	56 min
Mar 21, 8:30 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, East Baton Rouge, Iberville	60 min
Mar 21, 8:32 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, West Baton Rouge, West Feliciana	58 min
Mar 21, 8:45 AM CDT	Areal Flood Advisory	LIX	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Lafourche and 7 more	2 hr
Mar 21, 8:49 AM CDT	Tornado Warning	LIX	Ascension, Assumption, Iberville, Saint James	38 min
Mar 21, 9:10 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Saint Helena, West Feliciana	65 min
Mar 21, 9:18 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, Lafourche, Saint James, Terrebonne	57 min
Mar 21, 9:19 AM CDT	Tornado Warning	LIX	Ascension, East Baton Rouge, Iberville, Livingston	26 min
Mar 21, 9:29 AM CDT	River Flood Warning	LIX	Saint Tammany, Washington	19 days
Mar 21, 9:36 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Livingston, Saint Helena, Tangipahoa	54 min
Mar 21, 9:49 AM CDT	Tornado Warning	LIX	East Baton Rouge, East Feliciana, Livingston, Saint Helena	56 min
Mar 21, 10:05 AM CDT	River Flood Warning	LIX	Tangipahoa	4 days
Mar 21, 10:07 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Saint Charles, Saint John the Baptist, Saint Tammany, Tangipahoa and 1 more	53 min
Mar 21, 10:11 AM CDT	Special Marine Warning	LIX		2 hr
Mar 21, 10:16 AM CDT	Tornado Warning	LIX	Livingston, Saint John the Baptist, Tangipahoa	44 min
Mar 21, 10:24 AM CDT	River Flood Warning	LIX	Saint Tammany	49 hr
Mar 21, 10:24 AM CDT	Severe Thunderstorm Warning	LIX	Livingston, Saint Helena, Tangipahoa, Washington	51 min
Mar 21, 10:33 AM CDT	Special Marine Warning	LIX		117 min
Mar 21, 11:01 AM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa, Washington	59 min
Mar 21, 11:05 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Saint Charles, Saint John the Baptist, Tangipahoa, Terrebonne	55 min
Mar 21, 11:11 AM CDT	Small Craft Advisory	LIX		5 hr
Mar 21, 11:12 AM CDT	Areal Flood Advisory	LIX	Jefferson, Lafourche, Saint Charles, Saint John the Baptist, Saint Tammany, Tangipahoa and 2 more	2 hr
Mar 21, 11:18 AM CDT	Severe Thunderstorm Warning	LIX	Tangipahoa, Washington	57 min
Mar 21, 11:52 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles	53 min
Mar 21, 12:03 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Washington	57 min
Mar 21, 12:04 PM CDT	Special Marine Warning	LIX		116 min
Mar 21, 12:12 PM CDT	Tornado Warning	LIX	Saint Tammany	36 min
Mar 21, 12:38 PM CDT	Tornado Warning	LIX	Jefferson, Orleans, Saint Bernard	25 min
Mar 21, 1:16 PM CDT	Special Marine Warning	LIX		119 min
Mar 21, 1:46 PM CDT	Tornado Warning	LIX	Saint Tammany	29 min
Mar 21, 1:57 PM CDT	Special Marine Warning	LIX		33 min
Mar 21, 2:05 PM CDT	Severe Thunderstorm Warning	LIX	Washington	55 min
Mar 21, 3:13 PM CDT	Special Marine Warning	LIX		2 hr
Mar 21, 4:57 PM CDT	Areal Flood Advisory	LIX	Orleans, Plaquemines, Saint Bernard, Saint Tammany	2 hr
Mar 21, 5:25 PM CDT	Flash Flood Warning	LIX	Orleans, Saint Bernard, Saint Tammany	2 hr
Mar 21, 5:44 PM CDT	Special Marine Warning	LIX		2 hr
Mar 21, 4:29 AM CDT	Coastal Flood Warning	LIX		20 hr
Mar 21, 9:38 AM CDT	River Flood Warning	LIX	Pike, Walthall	44 hr
Mar 21, 9:46 AM CDT	River Flood Warning	LIX	Pearl River	4 days
Mar 21, 10:35 AM CDT	Severe Thunderstorm Warning	LIX	Amite, Pike	55 min
Mar 21, 12:49 PM CDT	Areal Flood Advisory	LIX	Hancock, Harrison, Jackson, Pearl River	116 min
Mar 21, 3:50 PM CDT	Severe Thunderstorm Warning	LIX	Hancock, Harrison, Jackson	40 min
Mar 21, 3:52 PM CDT	Areal Flood Advisory	LIX	Hancock, Harrison, Jackson	113 min
Mar 21, 6:18 PM CDT	Areal Flood Advisory	LIX	Hancock, Pearl River	117 min
Mar 21, 6:50 PM CDT	Flash Flood Warning	LIX	Hancock	3 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 2012 Severe Thunderstorm Warnings in Mississippi, 2012 Every severe thunderstorm warning in 2012

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.