2013-06-07 -2: Andrea is no longer a tropical storm and has transitioned to a post-tropical depression. However it still has capacity for considerable rain and storm conditions along the US eastern seaboard and will be monitored for a time yet.

2013-06-07: Andrea is expected to become post-tropical later today as it begins to be become absorbed into the continental air mass pattern. It will continue to drop 50-100mm of rain along the coast from the Carolinas into the maritimes and across to Newfoundland as it moves briskly along the coast.

2013-06-05: Tropical Storm Andrea, the first named Atlantic storm of the 2013 season, forms in the Gulf of Mexico.

The images above contains active information elements which can be accessed at the NHC site. Click on the image to go there or to the National Hurricane Center.

WTNT31 KNHC 072335
TCPAT1

BULLETIN
POST-TROPICAL CYCLONE ANDREA INTERMEDIATE ADVISORY NUMBER 9A
NWS NATIONAL HURRICANE CENTER MIAMI FL AL012013
800 PM EDT FRI JUN 07 2013

…POST-TROPICAL ANDREA MOVING RAPIDLY NEAR THE MID-ATLANTIC
COAST…

SUMMARY OF 800 PM EDT…0000 UTC…INFORMATION
———————————————-
LOCATION…37.5N 76.0W
ABOUT 45 MI…70 KM NNE OF NORFOLK VIRGINIA
ABOUT 75 MI…120 KM SW OF OCEAN CITY MARYLAND
MAXIMUM SUSTAINED WINDS…45 MPH…75 KM/H
PRESENT MOVEMENT…NE OR 40 DEGREES AT 35 MPH…55 KM/H
MINIMUM CENTRAL PRESSURE…996 MB…29.41 INCHES

WATCHES AND WARNINGS
——————–
CHANGES WITH THIS ADVISORY…

NONE.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT…

A TROPICAL STORM WARNING IS IN EFFECT FOR…
* SURF CITY NORTH CAROLINA TO CAPE CHARLES LIGHT VIRGINIA
* PAMLICO AND ALBEMARLE SOUNDS
* LOWER CHESAPEAKE BAY SOUTH OF NEW POINT COMFORT

GALE CONDITIONS ARE EXPECTED NEAR PORTIONS OF THE U.S. EAST COAST
FROM THE DELMARVA PENINSULA NORTHWARD TO SOUTHERN NEW JERSEY…AS
WELL AS COASTAL RHODE ISLAND AND SOUTHEASTERN MASSACHUSETTS. A
HIGH WIND ADVISORY IS IN EFFECT FOR NANTUCKET MASSACHUSETTS.

FOR ADDITIONAL INFORMATION…INCLUDING OTHER INLAND WATCHES AND
WARNINGS…PLEASE MONITOR PRODUCTS ISSUED BY YOUR LOCAL NATIONAL
WEATHER SERVICE FORECAST OFFICE AT WEATHER.GOV.

DISCUSSION AND 48-HOUR OUTLOOK
——————————
AT 800 PM EDT…0000 UTC…THE CENTER OF POST-TROPICAL CYCLONE
ANDREA WAS LOCATED NEAR LATITUDE 37.5 NORTH…LONGITUDE 76.0 WEST.
ANDREA IS MOVING TOWARD THE NORTHEAST NEAR 35 MPH…55 KM/H…AND
THIS GENERAL MOTION IS EXPECTED THROUGH SATURDAY. A TURN TOWARD THE
EAST-NORTHEAST AND EAST SHOULD OCCUR SATURDAY NIGHT AND SUNDAY. ON
THE FORECAST TRACK…THE CENTER OF ANDREA WILL MOVE NORTHEASTWARD
NEAR THE U.S. EAST COAST THROUGH SATURDAY…AND ACROSS ATLANTIC
CANADA LATE SATURDAY THROUGH SUNDAY.

MAXIMUM SUSTAINED WINDS REMAIN NEAR 45 MPH…75 KM/H…WITH HIGHER
GUSTS…MAINLY OVER THE ATLANTIC WELL TO THE EAST OF THE CENTER.
LITTLE CHANGE IN STRENGTH IS FORECAST DURING THE NEXT 48 HOURS.

TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 230 MILES…370 KM
TO THE EAST OF THE CENTER. A WEATHERFLOW STATION IN THE AVON
SOUND…RECENTLY REPORTED A SUSTAINED WIND OF 40 MPH…64
KM/H…AND A WIND GUST TO 49 MPH…79 KM/H.

THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 996 MB…29.41 INCHES.

HAZARDS AFFECTING LAND
———————-
RAINFALL…ANDREA IS EXPECTED TO PRODUCE TOTAL RAIN ACCUMULATIONS OF
2 TO 4 INCHES FROM CENTRAL NORTH CAROLINA NORTHEASTWARD ALONG THE
EASTERN SEABOARD INTO COASTAL MAINE.

STORM SURGE…LOCALIZED COASTAL FLOODING IS POSSIBLE ALONG PORTIONS
OF THE U.S. EAST COAST FROM NORTH CAROLINA TO NEW ENGLAND. FOR
INFORMATION SPECIFIC TO YOUR AREA…PLEASE SEE PRODUCTS ISSUED BY
YOUR LOCAL NATIONAL WEATHER SERVICE OFFICE.

WIND…TROPICAL STORM CONDITIONS WILL CONTINUE TO SPREAD
NORTHEASTWARD ALONG THE COASTS OF NORTH CAROLINA AND SOUTHEASTERN
VIRGINIA WITHIN THE WARNING AREA THROUGH THIS EVENING. WINDS NEAR
GALE FORCE ARE POSSIBLE ELSEWHERE ALONG THE COAST FROM VIRGINIA TO
ATLANTIC CANADA TONIGHT THROUGH SUNDAY.

TORNADOES…A FEW TORNADOES ARE POSSIBLE OVER NORTHEASTERN NORTH
CAROLINA…SOUTHEASTERN VIRGINIA…AND SOUTHEASTERN MARYLAND.

WTNT41 KNHC 072051
TCDAT1

POST-TROPICAL CYCLONE ANDREA DISCUSSION NUMBER 9
NWS NATIONAL HURRICANE CENTER MIAMI FL AL012013
500 PM EDT FRI JUN 07 2013

SURFACE OBSERVATIONS AND DOPPLER RADAR DATA INDICATE THAT ANDREA IS
NO LONGER TROPICAL. DEEP CONVECTION OVER NORTH CAROLINA
APPEARS TO BE ASSOCIATED MORE WITH A FRONTAL ZONE THAN THE
CYCLONE ITSELF…AND THE LOW-LEVEL CENTER HAS BEGUN TO LOSE
DEFINITION. HOWEVER…EVEN THOUGH THE CYCLONE IS BEING DECLARED
POST-TROPICAL…ADVISORIES FROM NHC WILL CONTINUE UNTIL THE SYSTEM
NO LONGER POSES A SIGNIFICANT THREAT TO THE U.S. EAST COAST.

THE INITIAL INTENSITY REMAINS 40 KT…WHICH IS SUPPORTED BY A
PARTIAL ASCAT PASS FROM 1448 UTC. TROPICAL STORM CONDITIONS ARE
PRIMARILY CONFINED TO THE ATLANTIC WATERS AND COASTAL AREAS OF
NORTH CAROLINA AND EXTREME SOUTHEASTERN VIRGINIA. THE INTENSITY
GUIDANCE CONTINUES TO SHOW ANDREA CHANGING LITTLE IN STRENGTH AS IT
MOVES UP THE U.S. EAST COAST…AND THE OFFICIAL INTENSITY FORECAST
IS UNCHANGED FROM THE PREVIOUS ONE. GLOBAL MODEL GUIDANCE IS
SHOWING ANDREA BEING STRETCHED OVER THE NORTH ATLANTIC IN 24-48
HOURS…WITH A SECOND LOW PRESSURE SYSTEM BECOMING THE MORE
DOMINANT SYSTEM AND ABSORBING ANDREA BY 72 HOURS EAST OF
NEWFOUNDLAND.

THE INITIAL MOTION IS 040/24 KT. ANDREA WILL CONTINUE TO ACCELERATE
NORTHEASTWARD DURING THE NEXT 24 HOURS WHILE IT BECOMES INCREASINGLY
EMBEDDED IN STRONG MID-LATITUDE FLOW. THE SPREAD AMONG THE TRACK
GUIDANCE REMAINS RELATIVELY SMALL…AND THE UPDATED NHC TRACK
FORECAST IS VERY SIMILAR TO THE PREVIOUS ONE.

IT SHOULD BE STRESSED THAT EVEN THOUGH ANDREA HAS BECOME
POST-TROPICAL…THE THREAT FOR HIGH WINDS…HEAVY RAINFALL…AND
LOCALIZED COASTAL FLOODING WILL CONTINUE THROUGH SATURDAY ACROSS
THE MID-ATLANTIC STATES AND NEW ENGLAND. HAZARDOUS CONDITIONS FROM
THE DELMARVA PENINSULA NORTHWARD TO NEW ENGLAND WILL CONTINUE TO BE
COMMUNICATED THROUGH LOCAL NATIONAL WEATHER SERVICE WARNING
PRODUCTS.

FORECAST POSITIONS AND MAX WINDS

INIT 07/2100Z 36.1N 77.8W 40 KT 45 MPH…POST-TROP/EXTRATROP
12H 08/0600Z 39.3N 74.1W 40 KT 45 MPH…POST-TROP/EXTRATROP
24H 08/1800Z 43.4N 67.6W 40 KT 45 MPH…POST-TROP/EXTRATROP
36H 09/0600Z 46.0N 60.0W 35 KT 40 MPH…POST-TROP/EXTRATROP
48H 09/1800Z 46.9N 51.5W 35 KT 40 MPH…POST-TROP/EXTRATROP
72H 10/1800Z…ABSORBED BY ANOTHER LOW

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Follow more general hurricane info at Atlantic and Eastern Pacific Hurricane Activity 2013