Wednesday, August 29, 2012

NOAA: Hurricane Isaac Flooding Southeast Louisiana

NEW ORLEANS, Louisiana -- At 6:00 a.m. Central Daylight Time on Wednesday August 29, 2012, NOAA's National Hurricane Center in Miami, Florida, issued a Hurricane Isaac Public Advisory due to Hurricane Isaac's pummeling of southeast Louisiana with two separate landfalls and accompanying storm surge and flooding. 


8 AM August 30 UPDATE: NOAA: 100% Chance New Tropical Cyclone Forms In Atlantic


NOAA reports that maximum winds associated with Hurricane Isaac are 80 miles per hour and that Hurricane force winds extend out 60 miles from the center while tropical storm force winds extend 175 miles out from the center.


Flooding from Hurricane Isaac's storm surge has been, and will continue to occur throughout Wednesday as Hurricane Isaac slowly moves through New Orleans, Louisiana.
 


NOAA says that Hurricane Isaac poses a significant storm surge threat to the northern U.S. Gulf Coast:


Southeast Louisiana and Mississippi: 6 to 12 feet. 
Alabama: 3 to 6 feet.
South Central Louisiana: 3 to 6 feet.
Florida Panhandle and Apalachee Bay: 2 to 4 feet


U.S. Gulf Coast Vulnerable To Erosion From Hurricane Isaac

Florida Governor Declares State of Emergency

Florida Power & Light Activates Emergency Plan

Florida Attorney General Activates Hurricane Price Gouging Hotline



NOAA's National Hurricane Center
stormtracker forecasts that Hurricane Isaac will take a northwesterly track and arrive just off the coast of New Orleans, Louisiana today.


The northeast quadrant of Tropical Storm Issac turned Hurricane Isaac, the most powerful area of a hurricane in the northern hemisphere, is now over Mississippi and the Alabama-Florida border as Hurricane Isaac passes over southeast Louisiana.



The majority of the spaghetti models predict that Hurricane Isaac will head west-northwest on Wednesday and become a tropical storm after landfall. Hurricane Issac is predicted to become a tropical depression on Friday when it reaches Arkansas and Missouri.


Hurricane Isaac 2012 Path Map: 

 


Latest Tropical Storm Isaac and Hurricane Isaac 2012 Information:

 

Hurricane Isaac is located 50 miles south-southwest of New Orleans, Louisiana with maximum sustained winds of 80 miles per hour, with higher gusts, as it moves west-northwest at 6 miles per hour .



A Hurricane Warning is in effect from Morgan City, Louisiana
(including metropolitan New Orleans, Louisiana, Lake Maurepas, and Lake Pontchartrain) to the Mississippi/Alabama border.
 


A Hurricane Watch is in effect from Intracoastal City to Morgan City, Louisiana.

A Tropical Storm Warning is in effect from the Mississippi/Alabama Border
to Destin, Florida, and from Cameron, Louisiana to Morgan City, Louisiana.
 

A Tropical Storm Watch has been issued from east of High Island, Texas to west of Cameron, Louisiana.


 
A hurricane warning means that hurricane conditions are expected somewhere within the warning area - in this case within the next 24 hours.  Preparations to protect life and property should be rushed to completion.




A hurricane watch means that hurricane conditions are possible within the watch area.  A watch is typically issued 48 hours before the anticipated first occurrence of tropical-storm-force winds.  Conditions that make outside preparations difficult or dangerous.

 
A tropical storm warning means that tropical storm conditions are expected somewhere within the warning area within 36 hours.
 

A tropical storm watch means that tropical storm conditions are possible within the watch area, in this case within 12 to 24 hours.

 

U.S. Gulf Coast Vulnerable To Erosion From Hurricane Isaac

NOAA Raises 2012 Hurricane Season Prediction 

Could Sahara Sand In Florida Mean Less 2012 Hurricanes? 


Latest Hurricane Isaac National Weather Service Official Public Advisory:

000
WTNT34 KNHC 291054
TCPAT4

BULLETIN
HURRICANE ISAAC INTERMEDIATE ADVISORY NUMBER  33A
NWS NATIONAL HURRICANE CENTER MIAMI FL       AL092012
600 AM CDT WED AUG 29 2012

...ISAAC CONTINUES TO LASH NEW ORLEANS...DANGEROUS STORM SURGE AND
FLOOD THREAT FROM HEAVY RAINS LIKELY TO CONTINUE THROUGH TODAY AND
TONIGHT...


SUMMARY OF 600 AM CDT...1100 UTC...INFORMATION
----------------------------------------------
LOCATION...29.4N 90.5W
ABOUT 20 MI...30 KM SE OF HOUMA LOUISIANA
ABOUT 50 MI...75 KM SSW OF NEW ORLEANS LOUISIANA
MAXIMUM SUSTAINED WINDS...80 MPH...130 KM/H
PRESENT MOVEMENT...NW OR 310 DEGREES AT 6 MPH...9 KM/H
MINIMUM CENTRAL PRESSURE...970 MB...28.64 INCHES


WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY...

NONE.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT...

A HURRICANE WARNING IS IN EFFECT FOR...
* EAST OF MORGAN CITY LOUISIANA TO THE MISSISSIPPI-ALABAMA BORDER...
INCLUDING METROPOLITAN NEW ORLEANS...LAKE PONTCHARTRAIN...AND LAKE
MAUREPAS

A HURRICANE WATCH IS IN EFFECT FOR...
* INTRACOASTAL CITY TO MORGAN CITY LOUISIANA

A TROPICAL STORM WARNING IS IN EFFECT FOR...
* THE MISSISSIPPI-ALABAMA BORDER TO DESTIN FLORIDA
* MORGAN CITY TO SABINE PASS TEXAS

A TROPICAL STORM WATCH IS IN EFFECT FOR...
* EAST OF HIGH ISLAND TEXAS TO JUST WEST OF SABINE PASS

FOR STORM INFORMATION SPECIFIC TO YOUR AREA...PLEASE MONITOR
PRODUCTS ISSUED BY YOUR LOCAL NATIONAL WEATHER SERVICE FORECAST
OFFICE. 


DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
AT 600 AM CDT...1100 UTC...THE CENTER OF HURRICANE ISAAC WAS LOCATED
NEAR LATITUDE 29.4 NORTH...LONGITUDE 90.5 WEST.  ISAAC HAS BEEN
WOBBLING OVER THE PAST COUPLE OF HOURS...BUT A GENERAL
NORTHWESTWARD MOTION NEAR 6 MPH...9 KM/H...IS EXPECTED THIS
MORNING.  A NORTHWESTWARD MOTION IS EXPECTED TO CONTINUE THROUGH
TONIGHT...FOLLOWED BY A TURN TOWARD THE NORTH-NORTHWEST BY THURSDAY
NIGHT OR EARLY FRIDAY.  ON THE FORECAST TRACK...THE CENTER OF ISAAC
WILL MOVE OVER LOUISIANA TODAY AND TOMORROW...AND OVER SOUTHERN
ARKANSAS EARLY FRIDAY.

MAXIMUM SUSTAINED WINDS ARE NEAR 80 MPH...130 KM/H...WITH HIGHER
GUSTS.  ISAAC IS A CATEGORY ONE HURRICANE ON THE SAFFIR-SIMPSON
HURRICANE WIND SCALE.  WEAKENING IS FORECAST AS ISAAC MOVES OVER
LAND DURING THE NEXT 48 HOURS.

HURRICANE-FORCE WINDS EXTEND OUTWARD UP TO 60 MILES...95 KM...FROM
THE CENTER...AND TROPICAL-STORM-FORCE WINDS EXTEND OUTWARD UP TO 
175 MILES...280 KM.   

DURING THE PAST HOUR...A SUSTAINED WIND OF 54 MPH WITH A GUST TO 70
MPH WAS REPORTED AT LAKEFRONT AIRPORT IN NEW ORLEANS...A SUSTAINED
WIND OF 46 MPH WITH A GUST TO 69 MPH WAS REPORTED AT NEW CANAL
STATION IN NEW ORLEANS...AND A SUSTAINED WIND OF 58 MPH WITH A GUST
TO 73 MPH WAS REPORTED AT SHELL BEACH LOUISIANA.

THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 970 MB...28.64 INCHES.


HAZARDS AFFECTING LAND
----------------------
STORM SURGE...THE COMBINATION OF A STORM SURGE AND THE TIDE WILL
CAUSE NORMALLY DRY AREAS NEAR THE COAST TO BE FLOODED BY RISING
WATERS. THE WATER COULD REACH THE FOLLOWING DEPTHS ABOVE GROUND IF
THE PEAK SURGE OCCURS AT THE TIME OF HIGH TIDE...

* MISSISSIPPI AND SOUTHEASTERN LOUISIANA...6 TO 12 FT
* ALABAMA...3 TO 6 FT
* SOUTH-CENTRAL LOUISIANA...3 TO 6 FT
* FLORIDA PANHANDLE AND APALACHEE BAY...2 TO 4 FT

THE DEEPEST WATER WILL OCCUR ALONG THE IMMEDIATE COAST IN AREAS OF
ONSHORE WINDS.  SURGE-RELATED FLOODING DEPENDS ON THE RELATIVE
TIMING OF THE SURGE AND THE TIDAL CYCLE...AND CAN VARY GREATLY OVER
SHORT DISTANCES.  FOR INFORMATION SPECIFIC TO YOUR AREA...PLEASE
SEE PRODUCTS ISSUED BY YOUR LOCAL WEATHER SERVICE OFFICE.  NEAR THE
COAST...THE SURGE WILL BE ACCOMPANIED BY LARGE AND DANGEROUS WAVES.

WIND...TROPICAL STORM CONDITIONS WILL CONTINUE ACROSS THE WARNING
AREA THIS MORNING...AND HURRICANE CONDITIONS WILL CONTINUE TO AFFECT
PORTIONS OF SOUTHEASTERN LOUISIANA IN THE HURRICANE WARNING AREA.

WINDS AFFECTING THE UPPER FLOORS OF HIGH-RISE BUILDINGS WILL BE
SIGNIFICANTLY STRONGER THAN THOSE NEAR GROUND LEVEL. AT ABOUT THE
30TH STORY...WINDS WOULD LIKELY BE ONE SAFFIR-SIMPSON CATEGORY
STRONGER THAN AT THE SURFACE.

RAINFALL...ISAAC IS EXPECTED TO PRODUCE TOTAL RAINFALL AMOUNTS OF 
7 TO 14 INCHES...WITH POSSIBLE ISOLATED MAXIMUM AMOUNTS OF 20
INCHES...OVER MUCH OF LOUISIANA...SOUTHERN MISSISSIPPI...AND
SOUTHWEST ALABAMA THROUGH FRIDAY MORNING. THESE RAINS COULD RESULT
IN SIGNIFICANT LOWLAND FLOODING. RAINS ARE EXPECTED TO INCREASE
NORTHWARD INTO ARKANSAS ON THURSDAY WITH AMOUNTS OF 3 TO 6 INCHES
EXPECTED OVER SOUTHERN ARKANSAS BY FRIDAY MORNING.

TORNADOES...ISOLATED TORNADOES ARE POSSIBLE ALONG THE CENTRAL GULF
COAST REGION AND PARTS OF THE LOWER MISSISSIPPI RIVER VALLEY
THROUGH WEDNESDAY.

SURF...DANGEROUS SURF AND RIP CURRENT CONDITIONS WILL CONTINUE TO
AFFECT THE WEST COAST OF FLORIDA AND THE NORTHERN GULF COAST FOR THE
NEXT DAY OR SO.


NEXT ADVISORY
-------------
NEXT INTERMEDIATE ADVISORY...800 AM CDT.
NEXT COMPLETE ADVISORY...1000 AM CDT.

$$
FORECASTER PASCH/ROBERTS/STEWART