River Flood Warning 11, NWS New Orleans, LA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW ORLEANS LA
433 PM CST WED JAN 9 2013

.SYNOPSIS...
SURFACE ANALYSIS SHOWED A 1011MB LOW OVER CENTRAL TEXAS COAST
WITH A WARM FRONT/STATIONARY FRONT EXTENDING EAST ALONG TEXAS AND
LOUISIANA COAST. A 1031MB HIGH WAS LOCATED FROM TENNESSEE VALLEY
TO THE CAROLINAS. COOL AIR FROM THE NORTHEAST AND WARM MOIST
SOUTHEAST FLOW SOUTH OF THE WARM FRONT HAVE CREATED A SATURATED
ATM ACROSS THE CENTRAL AND NORTH PARTS OF THE FORECAST AREA.
THEREFORE...DENSE FOG THREAT WILL REMAINS IN EFFECT THROUGHOUT THE
DAY FOR AREAS NEAR TIDAL LAKES AND EAST HALF OF NEW ORLEANS METRO
AREA. PLANER VIEW OF PRECIPITABLE WATER VALUES SHOWED 1.5 INCHES
OVER THE TEXAS COAST...LOUISIANA COAST AND EXTEND NORTH TO CENTRAL
MISSISSIPPI. UPPER AIR CHARTS SHOWED THE CLOSED LOW OVER TEXAS BIG
BEND WITH DIVERGENCE OVER EAST TEXAS AND WEST LOUISIANA.

&&

.SHORT TERM...
UPPER LEVEL LOW AND ASSOCIATED SURFACE LOW ARE EXPECTED TO TRACK
NORTH TO THE ARKLATEX REGION TONIGHT THROUGH THURSDAY. SURFACE
HIGH WILL REMAIN OVER OHIO VALLEY THROUGH TONIGHT. THIS WILL ALLOW
OR PREVENT THE WARM FRONT FROM TRACK TOO FAR NORTH. GFS SHOWED THE
DEEPEST MOISTURE PW VALUES UP TO 2 INCHES OVER SOUTHWEST LOUISIANA
THIS EVENING. AS THE UPPER LOW SHIFT EAST THROUGH THURSDAY
AFTERNOON...THIS MOISTURE AXIS WITH 2 INCHES OF PW WILL SHIFT EAST
ACROSS WEST ZONES EARLY THURSDAY MORNING AND SHIFT EAST OVER
MISSISSIPPI COAST AND COASTAL WATERS THURSDAY AFTERNOON AND
EVENING. AT THE SAME TIME...THE BEST DIVERGENCE WILL BE OVER THE
WEST ZONES THURSDAY MORNING AND SHIFT EAST THROUGH THURSDAY
AFTERNOON. IN ADDITION...AS THE UPPER LOW OPENS UP...THE JET MAX
WILL INCREASE ON THE FRONT SIDE OF THE LOW WITH A JET MAX OF 120
TO 130 KNOTS FROM NORTHWEST LOUISIANA TO SOUTHEAST KANSAS. THIS
SLIGHT NEGATIVE TILT MAY PROVIDE A SHORTER WAVELENGTH. AS A
RESULT...LL HELICITY MAY INCREASE UP TO 300 M/S FROM MIDNIGHT
TONIGHT THROUGH NOON THURSDAY ACCORDING TO GFS. MODEL SOUNDING SHOW A
CAPE VALUES INCREASE UP TO 800 J/KG BY LATE TONIGHT THROUGH
THURSDAY. THEREFORE...CANT RULE OUT STRONG TO SEVERE STORMS DURING
THIS TIME WITH THE MAIN THREAT DAMAGING WINDS AND A TORNADO OR
TWO...VERY SLIGHT CHANCE BUT HEAVY RAINFALL IS THE MAIN THREAT.

HAVE ADDED THE FLASH FLOOD WATCH ACROSS EAST ZONES AT THIS TIME
BUT LEFT HARRISON AND JACKSON AS THE SYSTEM WILL PICK UP SPEED
THURSDAY NIGHT. HAVE UP TOTALS WITH WIDESPREAD 2 TO 4 WITH HIGHER
AMOUNTS.

THE STORM SYSTEM WILL QUICKLY EXIT TO THE NORTHEAST THURSDAY NIGHT
WITH THE STALLED WEAK FRONTAL SYSTEM SLOWLY DISSIPATING ACROSS THE
FORECAST AREA. RAIN CHANCES WILL SLOWLY FALL WITH FRIDAY EXPECTED
TO BE THE DRIEST DAY OF THE NEXT WEEK WITH ONLY A 10 TO 20 PERCENT
CHANCE OF LEFTOVER SHOWERS. FOG WILL BE LIKELY ESPECIALLY IN
COASTAL AREAS FRIDAY NIGHT.

.LONG TERM...
THE UPPER LEVEL TROUGH OVER THE WESTERN STATES WILL LINGER OVER
THE WEEKEND...THEN THE BASE OF THE MAIN TROUGH MAY RETROGRADE BACK
WEST CLOSER TO THE DESERTS OF ARIZONA AND SOUTHERN CALIFORNIA
EARLY NEXT WEEK. THIS WILL MAINTAIN SOUTHWEST FLOW AND MAINTAIN A
STALLED FRONTAL BOUNDARY ACROSS THE FORECAST MONDAY THROUGH
WEDNESDAY. AS A RESULT...SOME COOLER TEMPS MAY TRY TO SNEAK INTO
NORTHWEST ZONES TUESDAY AND WEDNESDAY...COAST WILL REMAIN WARM.

AVIATION...
COMPLICATED TAF PACKAGE THIS PERIOD. GUIDANCE IS VERY PESSIMISTIC
WITH IFR TO LIFR CIGS PREVAILING THROUGH THE ENTIRE PERIOD AT MOST
TAF SITES...ESPECIALLY WITH THE WARM FRONT TO THE SOUTH.

MARINE...
A TIGHT PRESSURE GRADIENT IS EXPECTED TO PERSIST OVER THE COASTAL
WATERS AS A COLD FRONT SLOWLY MOVES TOWARD THE AREA TODAY AND
TONIGHT. EXERCISE CAUTION HEADLINES HAVE BEEN CONVERTED TO
ADVISORY TONIGHT THROUGH FRIDAY MORNING. A COLD FRONT WILL SLOWLY
MOVE THROUGH THE WATERS THURSDAY WITH WEAK HIGH PRESSURE BRIEFLY
BUILDING IN BEHIND IT. SOUTH FLOW WILL INCREASE OVER THE AREA
FRIDAY THROUGH SUNDAY. ANOTHER COLD FRONT WILL APPROACH THE WATERS
LATE MONDAY AND STALL WINDS WILL LIKELY DECREASE THEN.

DECISION SUPPORT...
DSS CODE...YELLOW.
DEPLOYED...NONE. ACTIVATION...NONE.
ACTIVITIES...SLURRY SUPPORT.

DECISION SUPPORT SERVICES (DSS) CODE LEGEND
GREEN  = NO WEATHER IMPACTS THAT REQUIRE ACTION
BLUE   = LONG FUSED WATCH/WARNING/ADVISORY IN EFFECT OR HIGH
         VISIBILITY EVENT
YELLOW = HEIGHTENED IMPACTS WITH SHORT FUSED
         WATCH/WARNING/ADVISORY ISSUANCES; RADAR SUPPORT
ORANGE = HIGH IMPACTS - SLIGHT TO MODERATE RISK SEVERE; NEARBY
         TROPICAL EVENTS; HAZMAT OR OTHER LARGE EPISODES
RED    = FULL ENGAGEMENT FOR MODERATE TO HIGH RISK SVR
         AND/OR DIRECT TROPICAL THREATS; EVENTS OF NATIONAL
         SIGNIFICANCE

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  65  71  55  75 /  60  90  50  20
BTR  67  73  58  77 /  70  90  40  20
ASD  67  70  57  75 /  40  90  60  20
MSY  69  73  57  74 /  50  90  50  20
GPT  68  70  58  73 /  30  90  70  20
PQL  68  71  57  74 /  30  90  80  40

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...DENSE FOG ADVISORY UNTIL 7 PM WEDNESDAY FOR THE FOLLOWING ZONES:
     LOWER PLAQUEMINES...LOWER ST. BERNARD...ORLEANS...UPPER
     PLAQUEMINES...AND UPPER ST. BERNARD.

     COASTAL FLOOD ADVISORY UNTIL 6 AM FRIDAY FOR THE FOLLOWING
     ZONES: ASCENSION...LIVINGSTON...LOWER PLAQUEMINES...LOWER
     ST. BERNARD...ORLEANS...SOUTHERN TANGIPAHOA...ST.
     CHARLES...ST. JAMES...ST. JOHN THE BAPTIST...ST.
     TAMMANY...UPPER JEFFERSON...UPPER PLAQUEMINES...AND UPPER
     ST. BERNARD.

     FLASH FLOOD WATCH FROM MIDNIGHT THURSDAY TO MIDNIGHT FRIDAY FOR
     THE FOLLOWING ZONES: LOWER JEFFERSON...LOWER
     LAFOURCHE...LOWER PLAQUEMINES...LOWER ST.
     BERNARD...ORLEANS...ST. CHARLES...ST. TAMMANY...UPPER
     JEFFERSON...UPPER PLAQUEMINES...UPPER ST. BERNARD...AND
     WASHINGTON.

     FLASH FLOOD WATCH UNTIL 6 PM THURSDAY FOR THE FOLLOWING ZONES:
     ASCENSION...ASSUMPTION...EAST BATON ROUGE...EAST
     FELICIANA...IBERVILLE...LIVINGSTON...LOWER
     TERREBONNE...NORTHERN TANGIPAHOA...POINTE COUPEE...SOUTHERN
     TANGIPAHOA...ST. HELENA...ST. JAMES...ST. JOHN THE
     BAPTIST...UPPER LAFOURCHE...UPPER TERREBONNE...WEST BATON
     ROUGE...AND WEST FELICIANA.

GM...DENSE FOG ADVISORY UNTIL 7 PM WEDNESDAY FOR THE FOLLOWING ZONES:
     BRETON SOUND...CHANDELEUR SOUND...LAKE BORGNE...AND LAKE
     PONTCHARTRAIN AND LAKE MAUREPAS.

     SMALL CRAFT ADVISORY FROM MIDNIGHT THURSDAY TO 6 AM FRIDAY FOR
     THE FOLLOWING ZONES: BRETON SOUND...CHANDELEUR
     SOUND...COASTAL WATERS FROM BOOTHVILLE LA TO THE SOUTHWEST
     PASS OF THE MISSISSIPPI RIVER OUT 20 NM...COASTAL WATERS
     FROM PASCAGOULA MS TO STAKE ISLAND LA FROM 20 TO 60
     NM...COASTAL WATERS FROM PASCAGOULA MS TO STAKE ISLAND LA
     OUT 20 NM...AND COASTAL WATERS FROM STAKE ISLAND LA TO THE
     SOUTHWEST PASS OF THE MISSISSIPPI RIVER FROM 20 TO 60 NM.

     SMALL CRAFT ADVISORY FROM MIDNIGHT THURSDAY TO 6 PM THURSDAY FOR
     THE FOLLOWING ZONES: COASTAL WATERS FROM PORT FOURCHON TO
     LOWER ATCHAFALAYA RIVER FROM 20 TO 60 NM...COASTAL WATERS
     FROM PORT FOURCHON TO LOWER ATCHAFALAYA RIVER OUT 20
     NM...COASTAL WATERS FROM THE SOUTHWEST PASS OF THE
     MISSISSIPPI RIVER TO PORT FOURCHON FROM 20 TO 60 NM...AND
     COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI
     RIVER TO PORT FOURCHON OUT 20 NM.

MS...FLASH FLOOD WATCH UNTIL 6 PM THURSDAY FOR THE FOLLOWING ZONES:
     AMITE...PIKE...AND WILKINSON.

     FLASH FLOOD WATCH FROM MIDNIGHT THURSDAY TO MIDNIGHT FRIDAY FOR
     THE FOLLOWING ZONES: HANCOCK...PEARL RIVER...AND WALTHALL.

     COASTAL FLOOD ADVISORY UNTIL 6 AM FRIDAY FOR THE FOLLOWING
     ZONES: AND HANCOCK.

GM...DENSE FOG ADVISORY UNTIL 7 PM WEDNESDAY FOR THE FOLLOWING ZONES:
     BRETON SOUND...CHANDELEUR SOUND...LAKE BORGNE...AND LAKE
     PONTCHARTRAIN AND LAKE MAUREPAS.

     SMALL CRAFT ADVISORY FROM MIDNIGHT THURSDAY TO 6 AM FRIDAY FOR
     THE FOLLOWING ZONES: BRETON SOUND...CHANDELEUR
     SOUND...COASTAL WATERS FROM BOOTHVILLE LA TO THE SOUTHWEST
     PASS OF THE MISSISSIPPI RIVER OUT 20 NM...COASTAL WATERS
     FROM PASCAGOULA MS TO STAKE ISLAND LA FROM 20 TO 60
     NM...COASTAL WATERS FROM PASCAGOULA MS TO STAKE ISLAND LA
     OUT 20 NM...AND COASTAL WATERS FROM STAKE ISLAND LA TO THE
     SOUTHWEST PASS OF THE MISSISSIPPI RIVER FROM 20 TO 60 NM.

     SMALL CRAFT ADVISORY FROM MIDNIGHT THURSDAY TO 6 PM THURSDAY FOR
     THE FOLLOWING ZONES: COASTAL WATERS FROM PORT FOURCHON TO
     LOWER ATCHAFALAYA RIVER FROM 20 TO 60 NM...COASTAL WATERS
     FROM PORT FOURCHON TO LOWER ATCHAFALAYA RIVER OUT 20
     NM...COASTAL WATERS FROM THE SOUTHWEST PASS OF THE
     MISSISSIPPI RIVER TO PORT FOURCHON FROM 20 TO 60 NM...AND
     COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI
     RIVER TO PORT FOURCHON OUT 20 NM.

&&

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