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Severe Weather Event Tues 3/8-Wed 3/9


tornadotony

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Just updated latest severe weather threat map, still seeing the highest potential for tornadic development in Central part of Louisiana. RUC showing SFC Based Capes still running over a 1000 (J/kg) in this area, coupled with SFC LI's holding around -6, and MLCAPES still running between 50-75. Also starting to see increased instability and potential across MS areas.

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MESOSCALE DISCUSSION 0211

NWS STORM PREDICTION CENTER NORMAN OK

0439 AM CST WED MAR 09 2011

AREAS AFFECTED...SERN LA/SERN MS

CONCERNING...TORNADO WATCH 45...

VALID 091039Z - 091145Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 45 CONTINUES.

THE THREAT FOR TORNADO-PRODUCING SUPERCELLS IS INCREASING ACROSS

PORTIONS OF SERN LA AND SERN MS. TORNADO WATCH 45 HAS BEEN EXPANDED

SWD TO INCLUDE THE REMAINDER OF SERN LA.

A SQUALL LINE EXTENDING FROM NEAR MEI TO 30 MILES WEST OF PIB TO 35

MILES SSW OF HEZ CONTINUES ADVANCING E-SEWD WITH AN ATTENDANT THREAT

FOR DAMAGING WINDS AND ISOLATED TORNADOES. MEANWHILE...RECENT RADAR

IMAGERY HAS INDICATED AN UPWARD TREND IN SEMI-DISCRETE CONVECTION

OVER SERN LA AND SERN MS AHEAD OF THE SQUALL LINE. THIS ACTIVITY IS

IN RESPONSE TO INCREASING ASCENT IN ASSOCIATION WITH A SUBTLE

MID-LEVEL SHORTWAVE TROUGH SWINGING THROUGH THE NWRN GULF OF MEXICO

AND SRN LA. THE ASCENT IS BEING AUGMENTED BY INCREASING LOW-LEVEL

CONVERGENCE WITHIN THE EXIT REGION OF A 50-55-KT 850-MB JET NOSING

INTO SRN LA PER RUC ANALYSIS. AS SUCH...SEMI-DISCRETE CONVECTION IS

FORECAST TO CONTINUE TO EVOLVE OVER SERN LA AND STREAM NEWD INTO

SERN MS EARLY THIS MORNING. RUC ANALYSIS INDICATES SBCAPE VALUES ON

THE ORDER OF 500-1000 J/KG OVER THE DISCUSSION AREA...WITH LITTLE IN

THE WAY OF CONVECTIVE INHIBITION...ALLOWING CONVECTION TO BECOME

ROOTED IN THE BOUNDARY LAYER AND DEEPEN. EFFECTIVE BULK SHEAR

MAGNITUDES AROUND 50 KT WILL PROMOTE SUPERCELLULAR STRUCTURES. GIVEN

VERY HIGH EFFECTIVE STORM-RELATIVE HELICITY VALUES BETWEEN 500 TO

700 M2/S2...LOW-LEVEL ROTATION WILL BE A THREAT WITH ANY SUSTAINED

SUPERCELLS /AS EVIDENT WITH THE EVOLVING SUPERCELL OVER CNTRL LAKE

PONTCHARTRAIN AND MARION COUNTY MISSISSIPPI/ WITH AN ATTENDANT

THREAT FOR TORNADOES. TORNADO WATCH 45 HAS BEEN EXPANDED SWD ACROSS

SERN LA IN COORDINATION WITH WFO SLIDELL.

..COHEN.. 03/09/2011

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Here's that strong couplet at the MS/LA state line I was talking about.

SEVERE WEATHER STATEMENT

NATIONAL WEATHER SERVICE NEW ORLEANS LA

528 AM CST WED MAR 9 2011

LAC103-MSC045-109-091200-

/O.CON.KLIX.TO.W.0020.000000T0000Z-110309T1200Z/

PEARL RIVER MS-HANCOCK MS-ST. TAMMANY LA-

528 AM CST WED MAR 9 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 AM CST FOR

NORTHWESTERN HANCOCK AND SOUTHWESTERN PEARL RIVER COUNTIES...AND

EASTERN ST. TAMMANY PARISH...

AT 524 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR AND STORM

SPOTTERS WERE TRACKING A CONFIRMED STRONG TORNADO. THIS TORNADO WAS

LOCATED NEAR PICAYUNE...MOVING NORTHEAST AT 30 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MCNEIL.

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One on the ground 15 miles or so West of N.O.

LAC095-091200-

/O.CON.KLIX.TO.W.0019.000000T0000Z-110309T1200Z/

ST. JOHN THE BAPTIST LA-

546 AM CST WED MAR 9 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 AM CST FOR

NORTHEASTERN ST. JOHN THE BAPTIST PARISH...

AT 543 AM CST...A TORNADO WAS REPORTED. THIS TORNADO WAS LOCATED

NEAR LAPLACE...MOVING EAST AT 45 MPH.

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Actually, make that 2 tornadoes on the ground, west of N.O. heading east.

LAC095-091200-

/O.CON.KLIX.TO.W.0019.000000T0000Z-110309T1200Z/

ST. JOHN THE BAPTIST LA-

546 AM CST WED MAR 9 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 AM CST FOR

NORTHEASTERN ST. JOHN THE BAPTIST PARISH...

AT 543 AM CST...A TORNADO WAS REPORTED. THIS TORNADO WAS LOCATED

NEAR LAPLACE...MOVING EAST AT 45 MPH.

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LAC103-MSC109-091230-

/O.CON.KLIX.TO.W.0023.000000T0000Z-110309T1230Z/

PEARL RIVER MS-ST. TAMMANY LA-

602 AM CST WED MAR 9 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 AM CST FOR

SOUTHWESTERN PEARL RIVER COUNTY...AND CENTRAL ST. TAMMANY PARISH...

AT 601 AM CST...A TORNADO WAS REPORTED. THIS TORNADO WAS LOCATED

NEAR BUSH...OR 10 MILES NORTHWEST OF PICAYUNE...MOVING EAST AT 25

MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MCNEIL

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MSC109-091230-

/O.CON.KLIX.TO.W.0024.000000T0000Z-110309T1230Z/

PEARL RIVER MS-

603 AM CST WED MAR 9 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 AM CST FOR EAST

CENTRAL PEARL RIVER COUNTY...

AT 601 AM CST...A TORNADO WAS REPORTED. THIS TORNADO WAS LOCATED

OVER PEARL RIVER COUNTY...OR 11 MILES SOUTHEAST OF POPLARVILLE...

MOVING NORTHEAST AT 30 MPH.

THE TORNADO WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE

INDICATED COUNTY.

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MARINE WEATHER STATEMENT

NATIONAL WEATHER SERVICE NEW ORLEANS LA

621 AM CST WED MAR 9 2011

GMZ530-091330-

/O.CON.KLIX.MA.W.0031.000000T0000Z-110309T1330Z/

621 AM CST WED MAR 9 2011

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 730 AM CST...

FOR THE FOLLOWING AREA...

LAKE PONTCHARTRAIN/LAKE MAUREPAS OVER GULF OF MEXICO WATERS...

INCLUDING EDEN ISLE...ORLEANS MARINA AND THE MID POINT OF THE

CAUSEWAY BRIDGE...

AT 615 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO

DETECT A THUNDERSTORM...PRODUCING A WATERSPOUT 8 NM NORTHWEST OF

ORLEANS MARINA...MOVING EAST AT 35 KNOTS.

THIS IS A VERY LARGE DANGEROUS TORNADIC WATERSPOUT AND WILL CROSS

THE SOUTH HALF OF THE CAUSEWAY BRIDGE.

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MESOSCALE DISCUSSION 0212

NWS STORM PREDICTION CENTER NORMAN OK

0628 AM CST WED MAR 09 2011

AREAS AFFECTED...SE LA...SRN MS...SW AL

CONCERNING...TORNADO WATCH 45...

VALID 091228Z - 091400Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 45 CONTINUES.

THE TORNADO AND WIND DAMAGE THREAT ACROSS WW 45 WILL CONTINUE TO

GRADUALLY MOVE EWD INTO FAR SE LA...FAR SRN MS...SRN AL AND THE WRN

FL PANHANDLE. A NEW WW WILL BE NEEDED TO REPLACE WW 45 BEFORE THE

14Z EXPIRATION.

A CLUSTER OF TORNADIC SUPERCELLS IS ONGOING ACROSS SE LA AND SRN MS

LOCATED ON THE SWRN END OF A LINEAR MCS EXTENDING NEWD INTO CNTRL

AL. THE STORMS ARE BEING SUPPORTED BY STRONG DEEP LAYER SHEAR AND

ENHANCED LOW-LEVEL SHEAR PROFILES ASSOCIATED WITH A 55 TO 70 KT

LOW-LEVEL JET. WSR-88D VWPS IN SRN MS CURRENTLY SHOW 0-3 KM

HELICITIES IN THE 400 TO 550 M2/S2 RANGE WHICH COMBINED WITH LOW-LCL

HEIGHTS WILL CONTINUE TO SUPPORT TORNADO DEVELOPMENT. A STRONG

TORNADO COULD OCCUR WITH THE MORE DOMINANT SUPERCELL STORMS. WIND

DAMAGE WILL ALSO BE POSSIBLE WITH SUPERCELLS AND WITH THE

FASTER-MOVING BOWING LINE-SEGMENTS ESPECIALLY AS THE MORE DISCRETE

STORMS CONGEAL INTO THE LINEAR MCS OVER THE NEXT FEW HOURS. THE

STRONGER INSTABILITY IS CURRENTLY LOCATED ACROSS SRN MS AND FAR SRN

AL SUGGESTING THE GREATEST SEVERE THREAT WILL REMAIN ACROSS THE SERN

PART OF THE WATCH.

..BROYLES.. 03/09/2011

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BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING

NATIONAL WEATHER SERVICE NEW ORLEANS LA

635 AM CST WED MAR 9 2011

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...

NORTHEASTERN ORLEANS PARISH IN SOUTHEAST LOUISIANA...

SOUTHEASTERN ST. TAMMANY PARISH IN SOUTHEAST LOUISIANA...

THIS INCLUDES THE CITIES OF...SLIDELL...EDEN ISLE...

HANCOCK COUNTY IN SOUTHERN MISSISSIPPI...

THIS INCLUDES THE CITIES OF...WAVELAND...DIAMONDHEAD...

SOUTHWESTERN PEARL RIVER COUNTY IN SOUTHERN MISSISSIPPI...

* UNTIL 730 AM CST

* AT 633 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A

SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 10 MILES

SOUTHWEST OF LACOMBE...OR 11 MILES NORTHWEST OF EAST NEW ORLEANS...

MOVING NORTHEAST AT 45 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PEARL

RIVER...PEARLINGTON...STENNIS SPACE CENTER AND KILN.

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220

NWUS54 KLIX 091239

LSRLIX

PRELIMINARY LOCAL STORM REPORT

NATIONAL WEATHER SERVICE NEW ORLEANS LA

639 AM CST WED MAR 09 2011

.TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON

.DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.

..REMARKS..

0520 AM TORNADO 10 SW BUSH 30.51N 90.02W

03/09/2011 ST. TAMMANY LA EMERGENCY MNGR

*** 1 INJ *** TREES DOWN AND HOUSE DAMAGE NORTH OF

WALDHEIM. TRAILER DESTROYED. 1 INJURED.

KGRAHAM

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SEVERE WEATHER STATEMENT

NATIONAL WEATHER SERVICE NEW ORLEANS LA

643 AM CST WED MAR 9 2011

LAC051-071-075-087-089-091330-

/O.CON.KLIX.SV.W.0019.000000T0000Z-110309T1330Z/

ST. CHARLES LA-ST. BERNARD LA-JEFFERSON LA-ORLEANS LA-PLAQUEMINES LA-

643 AM CST WED MAR 9 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 AM CST

FOR NORTHWESTERN PLAQUEMINES...ORLEANS...NORTHERN JEFFERSON...WEST

CENTRAL ST. BERNARD AND SOUTHERN ST. CHARLES PARISHES...

AT 638 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO

DETECT A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING

DESTRUCTIVE WINDS IN EXCESS OF 80 MPH. THESE STORMS WERE LOCATED

ALONG A LINE EXTENDING FROM LAKEFRONT AIRPORT TO AVONDALE TO DES

ALLEMANDS...OR ALONG A LINE EXTENDING FROM EAST NEW ORLEANS TO

AVONDALE TO 8 MILES SOUTH OF HAHNVILLE...MOVING EAST AT 30 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO

MARRERO...GRETNA...CHALMETTE...HARVEY...TERRYTOWN...TIMBERLANE...LAKE

CATHERINE...VIOLET AND BELLE CHASSE

NEW ORLEANS INTERNATIONAL AIRPORT RECORDED A GUSTS OF 78 MPH AND THE

STRONGEST WINDS ARE MOVING INTO DOWNTOWN NEW ORLEANS RIGHT

NOW...TAKE COVER!!!

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SEVERE WEATHER STATEMENT

NATIONAL WEATHER SERVICE NEW ORLEANS LA

653 AM CST WED MAR 9 2011

LAC071-103-MSC045-109-091330-

/O.CON.KLIX.TO.W.0025.000000T0000Z-110309T1330Z/

PEARL RIVER MS-HANCOCK MS-ORLEANS LA-ST. TAMMANY LA-

653 AM CST WED MAR 9 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 AM CST FOR HANCOCK

AND SOUTHWESTERN PEARL RIVER COUNTIES...AND SOUTHEASTERN ST. TAMMANY

AND NORTHEASTERN ORLEANS PARISHES...

AT 647 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO

DETECT A TORNADO. THIS TORNADO WAS LOCATED NEAR SLIDELL...MOVING

NORTHEAST AT 50 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PEARL

RIVER...PEARLINGTON...STENNIS SPACE CENTER...WAVELAND...KILN AND

DIAMONDHEAD

STRONG ROTATION MOVING OVER NORTHSHORE MALL AND NUMEROUS POWER HITS

HAVE OCCURRED AT THE WFO. CIRCULATION WILL BE MOVING OVER THE

INTERSTATE 12 AND 59 SHORTLY.

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SEVERE WEATHER STATEMENT

NATIONAL WEATHER SERVICE MOBILE AL

659 AM CST WED MAR 9 2011

MSC039-041-111-131-091315-

/O.CON.KMOB.TO.W.0009.000000T0000Z-110309T1315Z/

GEORGE MS-STONE MS-PERRY MS-GREENE MS-

659 AM CST WED MAR 9 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 AM CST FOR

SOUTHWESTERN GREENE...SOUTHERN PERRY...NORTHEASTERN STONE AND

NORTHWESTERN GEORGE COUNTIES...

AT 656 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO

INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS

TORNADO WAS NEAR DEEP CREEK...OR ABOUT 14 MILES NORTHEAST OF

WIGGINS...MOVING NORTHEAST AT 55 MPH. TREES AND POWER LINES HAVE

BEEN DOWNED IN WIGGINS.

THE TORNADO WILL BE NEAR...

AVENT...AVENT STATION...LEAF AND ROYCE AROUND 705 AM CST...

MERRILL AND BEXLEY AROUND 710 AM CST...

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