Alert archive / Louisiana / Tornado Watches in 2003

Tornado Watch 606

June 30, 20034 counties in Alabama; 23 parishes in Louisiana; 15 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Jun 30, 2003, 6:55 AM CDT for 4 counties in Alabama; 23 parishes in Louisiana; 15 counties in Mississippi. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued: Jun 30, 2003, 6:55 AM CDT (11:55 UTC)
Expired: Jun 30, 2003, 4:00 PM CDT
In force: 9 hr
Issued by: the Storm Prediction Center

All 42 counties

Baldwin County, AL, Clarke County, AL, Mobile County, AL, Washington County, AL, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Pointe Coupee Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Stone County, MS, Walthall County, MS, Wilkinson County, MS

Warnings issued inside it

11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jun 30, 7:00 AM CDT	Flash Flood Warning	LIX	Jackson	6 hr
Jun 30, 10:07 AM CDT	Flash Flood Warning	LIX	Assumption, Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard and 4 more	4 hr
Jun 30, 10:46 AM CDT	Tornado Warning	LIX	Saint Bernard	44 min
Jun 30, 11:54 AM CDT	Tornado Warning	LIX	Saint Bernard	31 min
Jun 30, 12:20 PM CDT	Flash Flood Warning	LCH	Saint Martin, St. Mary	4 hr
Jun 30, 12:31 PM CDT	Tornado Warning	LIX	Saint John the Baptist	29 min
Jun 30, 12:43 PM CDT	Tornado Warning	LIX	Orleans	32 min
Jun 30, 1:09 PM CDT	Flash Flood Warning	LIX	Saint Tammany, Tangipahoa	3 hr
Jun 30, 1:17 PM CDT	Tornado Warning	LIX	Saint Tammany	28 min
Jun 30, 1:42 PM CDT	Flash Flood Warning	LIX	Jackson	3 hr
Jun 30, 3:34 PM CDT	Flash Flood Warning	LIX	Hancock	4 hr

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 11.9 hours before the alert went out and 66 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: 122 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 700 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -90 m²/s²
0-3 km storm-relative helicity: -48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 301200
SEL6  
SPC WW 301155
ALZ000-LAZ000-MSZ000-CWZ000-302100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 606 
NWS STORM PREDICTION CENTER NORMAN OK 
655 AM CDT MON JUN 30 2003

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       SOUTHWEST ALABAMA
       SOUTHEAST LOUISIANA
       SOUTHERN MISSISSIPPI
       COASTAL WATERS

EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 655 AM UNTIL 400
PM CDT.

TORNADOES...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS
LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 70 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 45 MILES WEST SOUTHWEST OF BATON ROUGE
LOUISIANA TO 30 MILES EAST OF MOBILE ALABAMA.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.




DISCUSSION...CONDITIONS IN ADVANCE OF T.S. BILL WILL BECOME
INCREASINGLY FAVORABLE FOR ISOLATED TORNADOES ACROSS SERN LA/SRN
MS/SRN AL THROUGH THE MORNING. DIURNAL HEATING WILL AID
DESTABILIZATION OF THE AIR MASS AND LOW LEVEL SHEAR WILL STRENGTHEN
AS T.S. CENTER APPROACHES THE COAST. PRIMARY TORNADO POTENTIAL WITH
THIS SYSTEM WILL BE GREATEST ALONG AND EAST OF BILL/S TRACK.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH EXTREME
TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI
WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 18020.


...EVANS

311,0915 314,0874 294,0874 291,0915

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 30, 9:57 AM CDT	Mesoscale Discussion	SPC	Conecuh, Covington, Escambia, Monroe	93 min
Jun 30, 10:30 AM CDT	Tornado Watch	SPC	Baldwin, Escambia	6 hr
Jun 30, 11:23 AM CDT	Mesoscale Discussion	SPC	Mobile, Washington	2 hr
Jun 30, 1:46 PM CDT	Mesoscale Discussion	SPC	Baldwin, Escambia	119 min
Jun 30, 3:13 PM CDT	Mesoscale Discussion	SPC	Baldwin, Escambia, Mobile, Washington	92 min
Jun 30, 3:35 PM CDT	Tornado Watch	SPC	Baldwin, Escambia, Mobile	6 hr
Jun 30, 4:46 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, Jefferson, Lafourche, Livingston and 10 more	2 hr

Nearby

Tornado Watches in Louisiana, 2003 Tornado Watches in Mississippi, 2003 Tornado Watches in Alabama, 2003 Every tornado watch in 2003

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.