Tropical Storm Hanna Update 6

000
WTNT33 KNHC 070307
TCPAT3
BULLETIN
TROPICAL STORM HANNA ADVISORY NUMBER 41...CORRECTED
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL082008
1100 PM EDT SAT SEP 06 2008

CORRECTED MAXIMUM WIND SPEED IN REPEAT SECTION

...HANNA PRODUCING HEAVY RAINFALL ACROSS MOST OF NEW ENGLAND...

AT 11 PM EDT...0300 UTC...THE TROPICAL STORM WARNING IS DISCONTINUED
FROM SANDY HOOK NEW JERSEY SOUTHWARD. A TROPICAL STORM WARNING IS
NOW IN EFFECT FROM NORTH OF SANDY HOOK NORTHWARD TO MERRIMACK RIVER
MASSACHUSETTS...INCLUDING NEW YORK HARBOR...LONG ISLAND SOUND...
BLOCK ISLAND...MARTHA'S VINEYARD AND NANTUCKET. A TROPICAL
STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE EXPECTED
WITHIN THE WARNING AREA WITHIN THE NEXT 24 HOURS.

FOR STORM INFORMATION SPECIFIC TO YOUR AREA...INCLUDING POSSIBLE
INLAND WATCHES AND WARNINGS...PLEASE MONITOR PRODUCTS ISSUED
BY YOUR LOCAL WEATHER OFFICE.

AT 1100 PM EDT...0300Z...THE CENTER OF TROPICAL STORM HANNA WAS
LOCATED NEAR LATITUDE 40.5 NORTH...LONGITUDE 73.4 WEST OR ABOUT 90
MILES...145 KM...WEST-SOUTHWEST OF THE EASTERN TIP OF LONG ISLAND
AND ABOUT 135 MILES...220 KM...SOUTHWEST OF PROVIDENCE RHODE ISLAND.

HANNA IS MOVING TOWARD THE NORTHEAST NEAR 30 MPH...48 KM/HR. THIS
GENERAL MOTION IS EXPECTED TO CONTINUE WITH AN INCREASE IN FORWARD
SPEED DURING THE NEXT COUPLE OF DAYS. ON THE FORECAST TRACK...THE
CENTER OF HANNA WILL MOVE NEAR OR OVER SOUTHERN NEW ENGLAND TONIGHT
AND SUNDAY MORNING... AND MOVE OVER THE CANADIAN MARITIMES BY
SUNDAY AFTERNOON.

INFORMATION FROM SHIPS...BUOYS...AND NOAA DOPPLER WEATHER RADARS
INDICATE MAXIMUM SUSTAINED WINDS REMAIN NEAR 55 MPH...93 KM/HR...
WITH HIGHER GUSTS. LITTLE CHANGE IN STRENGTH IS FORECAST DURING THE
NEXT COUPLE OF DAYS. HOWEVER...HANNA IS EXPECTED TO LOSE TROPICAL
CHARACTERISTICS BY SUNDAY AFTERNOON.

TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 200 MILES...325 KM
...MAINLY OVER WATER TO THE EAST AND SOUTHEAST OF THE CENTER. DURING
THE PAST COUPLE OF HOURS...REPORTS FROM SEVERAL SHIPS AND BUOYS
SOUTH OF LONG ISLAND INDICATE SUSTAINED WINDS OF 45 MPH...72 KM/HR
TO 55 MPH...86 KM/HR...WITH HIGHER GUSTS.

THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 992 MB...29.29 INCHES.

STORM SURGE FLOODING OF 1 TO 3 FEET ABOVE NORMAL TIDE LEVELS...WITH
LOCALLY HIGHER LEVELS IN BAYS AND ACCOMPANIED BY LARGE AND DANGEROUS
BATTERING WAVES...IS EXPECTED IN THE WARNING AREA.

HANNA IS EXPECTED TO PRODUCE RAINFALL ACCUMULATIONS OF 2 TO 4 INCHES
ACROSS NEW ENGLAND...WITH ISOLATED MAXIMUM AMOUNTS OF 6 INCHES
POSSIBLE. THESE RAINFALL AMOUNTS COULD PRODUCE FLASH FLOODS ACROSS
THE REGION.

ISOLATED TORNADOES ARE POSSIBLE TONIGHT OVER THE COASTAL AREAS OF
SOUTHERN NEW ENGLAND.

REPEATING THE 1100 PM EDT POSITION...40.5 N...73.4 W. MOVEMENT
TOWARD...NORTHEAST NEAR 30 MPH. MAXIMUM SUSTAINED WINDS...55 MPH.
MINIMUM CENTRAL PRESSURE...992 MB.

AN INTERMEDIATE ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE
CENTER AT 200 AM EDT FOLLOWED BY THE NEXT COMPLETE ADVISORY AT 500
AM EDT.

$$
FORECASTER STEWART

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ZCZC MIATCDAT3 ALL
TTAA00 KNHC DDHHMM
TROPICAL STORM HANNA DISCUSSION NUMBER 41
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL082008
1100 PM EDT SAT SEP 06 2008

THE CENTER OF HANNA IS MOVING OVER THE WEST-CENTRAL PORTION OF LONG
ISLAND. THE INITIAL MOTION ESTIMATE IS 050/26...AND HANNA IS RIGHT
ON TRACK. GRADUAL ACCELERATION IS FORECAST DURING THE NEXT 48 HOURS
AS HANNA GETS CAUGHT UP IN THE FAST UPPER-LEVEL WESTERLIE...AND THE
NEW NHC MODEL GUIDANCE IS TIGHTLY CLUSTERED ABOUT THE PREVIOUS
FORECAST TRACK. THEREFORE...NO SIGNIFICANT CHANGES HAVE BEEN MADE
AND HANNA IS EXPECTED TO CLEAR THE U.S. COASTLINE AROUND CAPE COD
MASSACHUSETTS BY 07/0900Z.

HANNA'S FAST FORWARD MOTION HAS LIKELY CONTRIBUTED TO SOME OF
INCREASE IN OBSERVED SURFACE WINDS OBTAINED FROM SHIPS AND BUOYS
SOUTH OF LONG ISLAND. TWO UNCONFIRMED SHIP REPORTS OF 64 KT AND 60
KT HAVE BEEN RECEIVED DURING THE PAST COUPLE OF HOURS...ONE OF
WHICH OCCURRED IN A RAIN BAND. HOWEVER...THESE COULD HAVE BEEN
ISOLATED GUSTS AND THE RAIN BANDS HAVE SINCE DISSIPATED.
THEREFORE...THE INITIAL INTENSITY WILL BE 50 KT FOR THIS ADVISORY
BASED ON EARLIER DOPPLER VELOCITY VALUES OF 70 KT AT 5000 TO 7000
FT THAT COVERED A SIGNIFICANT PORTION OF THE SOUTHEASTERN QUADRANT
OF HANNA IN SEVERAL RAIN BANDS. LITTLE CHANGE IN STRENGTH IS
EXPECTED THROUGHOUT THE FORECAST PERIOD...AND HANNA COULD EASILY BE
AN EXTRATROPICAL STORM WITH 50-KT SUSTAINED WINDS AT ANY OF THE
FORECAST TIMES.

FORECAST POSITIONS AND MAX WINDS

INITIAL 07/0300Z 40.5N 73.4W 50 KT...BECOMING EXTRATROPICAL
12HR VT 07/1200Z 43.0N 68.8W 50 KT...EXTRATROPICAL
24HR VT 08/0000Z 46.4N 61.1W 45 KT...EXTRATROPICAL
36HR VT 08/1200Z 48.8N 53.2W 45 KT...EXTRATROPICAL
48HR VT 09/0000Z 50.0N 45.0W 45 KT...EXTRATROPICAL
72HR VT 10/0000Z 52.5N 28.3W 45 KT...EXTRATROPICAL
96HR VT 11/0000Z 56.5N 15.5W 45 KT...EXTRATROPICAL
120HR VT 12/0000Z 61.5N 11.5W 45 KT...EXTRATROPICAL

$$
FORECASTER STEWART

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