Extratropical Storm Hanna Update 9

WOCN31 CWHX 072100
POST-TROPICAL STORM HANNA INTERMEDIATE INFORMATION STATEMENT
ISSUED BY THE CANADIAN HURRICANE CENTRE OF ENVIRONMENT CANADA
AT 6.00 PM ADT SUNDAY 07 SEPTEMBER 2008.

THE NEXT STATEMENT WILL BE ISSUED BY 9.00 PM ADT

AT 6.00 PM ADT... POST-TROPICAL STORM HANNA WAS LOCATED NEAR
LATITUDE 46.8 N AND LONGITUDE 60.9 W... ABOUT 50 NAUTICAL MILES
OR 95 KM NORTHWEST OF SYDNEY.

HANNA IS MOVING TOWARDS THE EAST NORTHEAST AT 37 KNOTS... 69
KM/H. MAXIMUM SUSTAINED WINDS ARE ESTIMATED AT 40 KNOTS... 74
KM/H AND CENTRAL PRESSURE AT 997 MB.

THE POSITION OF HANNA IS BASED ON SURFACE OBSERVATIONS.
CIRCULATION IS NOT EVIDENT ON RADAR AND THE SYSTEM IS BEGINNING
TO LOOK BAROCLINIC ON SATELLITE IMAGERY.

THE HEAVY RAINS HAVE JUST ABOUT CLEARED THE MARITIMES AND HAVE
SPREAD ACROSS WESTERN NEWFOUNDLAND. RAIN WILL CONTINUE OVER
NEWFOUNDLAND THIS EVENING AND TAPER TO SCATTERED SHOWERS
OVERNIGHT.

IMPACTS NOTED...
THE PUBLIC AND HAVE REPORTED FLOODED ROADS AND DITCHS ACROSS
SOUTHERN NEW BRUNSWICK AND NORTHERN NOVA SCOTIA.

RAINFALL AMOUNTS...
NOTEWORTHY RAINFALL ACCUMLATIONS ASSOCIATED WITH HANNA TO 5 PM ADT
INCLUDE...
142 MM AT SAINT JOHN NEW BRUNSWICK
105 MM AT CROWE BROOK NEW BRUNSWICK
104 MM AT PARRSBORO NOVA SCOTIA
92 MM AT HARRINGTON PEI.

PUBLIC AND MARINE INTERESTS ARE ADVISED TO MONITOR FORECASTS
AND WARNINGS ISSUED FOR THEIR REGION BY ENVIRONMENT CANADA.

END SAULNIER

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WOCN31 CWHX 071800
POST-TROPICAL STORM HANNA INFORMATION STATEMENT ISSUED BY THE
CANADIAN HURRICANE CENTRE OF ENVIRONMENT CANADA AT 3.00 PM ADT
SUNDAY 07 SEPTEMBER 2008.

THE NEXT STATEMENT WILL BE ISSUED BY 9.00 PM ADT

... HANNA SOAKS PARTS OF THE MARITIMES AND NOW HEADED FOR
NEWFOUNDLAND...

1. CURRENT POSITION, STRENGTH, CENTRAL PRESSURE AND MOTION

AT 3.00 PM ADT... POST-TROPICAL STORM HANNA WAS LOCATED NEAR
LATITUDE 46.1 N AND LONGITUDE 62.9 W... ABOUT 10 NAUTICAL MILES
OR 25 KM SOUTHEAST OF CHARLOTTETOWN . MAXIMUM SUSTAINED WINDS
ARE ESTIMATED AT 40 KNOTS... 74 KM/H... AND CENTRAL PRESSURE AT 996
MB. HANNA IS MOVING EAST NORTHEAST AT 35 KNOTS... 65 KM/H.

2. FORECAST POSITION, CENTRAL PRESSURE AND STRENGTH

DATE TIME LAT LON MSLP MAX WIND
ADT MB KTS KMH
SEP 07 3.00 PM 46.1N 62.9W 996 40 74 POST-TROPICAL
SEP 07 9.00 PM 47.6N 58.4W 997 40 74 POST-TROPICAL
SEP 08 3.00 AM 48.8N 53.7W 998 35 65 POST-TROPICAL
SEP 08 9.00 AM 49.7N 49.9W 998 45 83 POST-TROPICAL
SEP 08 3.00 PM 50.5N 45.9W 996 45 83 POST-TROPICAL
SEP 08 9.00 PM 51.2N 42.3W 994 50 93 POST-TROPICAL
SEP 09 3.00 AM 51.9N 38.5W 997 50 93 POST-TROPICAL
SEP 09 9.00 AM 52.3N 34.9W 988 55 102 POST-TROPICAL
SEP 09 3.00 PM 52.7N 30.7W 985 55 102 POST-TROPICAL

3. PUBLIC WEATHER IMPACTS AND WARNINGS SUMMARY POST-TROPICAL STORM
HANNA IS BRINGING PERIODS OF HEAVY RAIN
TO CAPE BRETON AND IS SPREADING INTO NEWFOUNDLAND. RAINFALL
WARNINGS ARE IN EFFECT FOR PRINCE EDWARD ISLAND NORTHEASTERN
NOVA SCOTIA AND SOUTHERN AND CENTRAL NEWFOUNDLAND. TOTAL
RAINFALLS OF 40 TO 60 MM ARE FORECAST FOR REGIONS OF
NEWFOUNDLAND AND LOCALLY HIGHER AMOUNTS ARE POSSIBLE. WINDS
GUSTING UP TO 70 KM/H CAN BE EXPECTED OVER EASTERN NOVA SCOTIA
MOSTLY NEAR THE ATLANTIC COAST.

THERE HAVE BEEN REPORTS OF LOCALIZED FLOODING ACROSS SOUTHERN
NEW BRUNSWICK AND NORTHERN NOVA SCOTIA AND NUMEROUS REPORTS OF
DOWNED TREE BRANCHES AND SOME POWER OUTAGES.

4. MARINE WEATHER IMPACTS AND WARNINGS SUMMARY
GALES ARE FORECAST OVER MARITIME AND NEWFOUNDLAND WATERS SOUTH
OF THE TRACK OF POST-TROPICAL STORM HANNA FOR THE REMAINDER OF
THE AFTERNOON AND TONIGHT. GALES WILL PERSIST OVER SOUTHERN
EASTERN WATERS OF NEWFOUNDLAND ON MONDAY.
WAVE HEIGHTS ASSOCIATED WITH THESE WINDS HAVE REACHED 5 TO 6
METRES OVER WESTERN AREAS AND WILL SPREAD EASTERN TONIGHT.

5. TECHNICAL DISCUSSION

A. ANALYSIS
THE CENTRE OF HANNA IS OVER THE NORTHUMBERLAND STRAIT AND IS
WELL PLACED BY SURFACE OBSERVATIONS. HANNA HAS BEEN A TYPICAL
AND WELL BEHAVED EXTRA-TROPICAL SYSTEM. LATEST RADAR DATA
SHOWS THE BULK OF THE HEAVIEST RAIN IS LEFT OF THE STORM'S
TRACK AND THE STRONGEST WINDS HAVE BEEN OBSERVED TO THE RIGHT
OF HANNA'S TRACK.

B. PROGNOSTIC
THE GREATEST CONCERN WITH POST-TROPICAL HANNA IS RAINFALL.
COMPUTER MODELS HAVE BEEN VERY CONSISTENT WITH REGARDS TO THE
TRACK AND INTENSITY OF HANNA..WITH THE CONSENSUS TAKING THE
CENTRE OF POST-TROPICAL HANNA ALONG A PATH THROUGH THE GULF
OF ST LAWRENCE TO CLIP THE NORTHERN EDGE OF CAPE BRETON THIS
EVENING AND AND ACROSS NEWFOUNDLAND TONIGHT AND THEN MOVING
ALONG EASTERWARD WITH THE 500 MB FLOW ON MONDAY. A SHORTWAVE
TROUGH IS FORECAST TO BEGIN INTERACTING WITH THE REMNANTS OF
HANNA IN ABOUT 24 HOURS AND FORM A TRAILING BAROCLINIC STORM
OVER THE NORTH ATLANTIC.

C. PUBLIC WEATHER
SEE ABOVE.

D. MARINE WEATHER
THESE WIND RADII REPRESENT BOTH HANNA AND THE LARGE SCALE CIRCULATION
AT THE OUTER EDGES OF THE STORM.

PREDICTED WIND RADII (NM)
TIME GALES STORMS HURRICANE
NE SE SW NW NE SE SW NW NE SE SW NW
07/18Z 0 185 185 0 0 0 0 0 0 0 0 0
08/00Z 0 180 180 0 0 0 0 0 0 0 0 0
08/06Z 0 150 150 0 0 0 0 0 0 0 0 0
08/12Z 90 180 180 30 0 0 0 0 0 0 0 0
08/18Z 120 225 200 60 0 0 0 0 0 0 0 0
09/00Z 150 225 200 90 0 0 0 0 0 0 0 0
09/06Z 175 250 200 150 0 0 15 0 0 0 0 0
09/12Z 225 250 250 150 0 0 60 60 0 0 0 0
09/18Z 250 250 250 150 0 0 75 75 0 0 0 0

END SAULNIER