Extratropical Storm Bill Moves Away From Newfoundland, and Out to Sea

WOCN31 CWHX 241200
Post-tropical storm Bill information statement issued by the
Canadian hurricane centre of Environment Canada at 9.30 AM NDT
Monday 24 August 2009.

The next statement will be issued by 12.30 PM NDT

... Bill moves away from Newfoundland.. Toward the open sea ...

1. Current position, strength, central pressure and motion

At 9.30 AM NDT... Post-tropical storm Bill was located near
Latitude 48.9 N and longitude 45.3 W ... About 305 nautical miles
Or 570 km east northeast of st johns. Maximum sustained winds
Are estimated at 55 knots... 102 km/h... And central pressure at
990 MB. Bill is moving east at 42 knots... 78 km/h.

2. Forecast position, central pressure and strength

Date time lat lon MSLP Max wind
NDT MB kts kmh
Aug 24 9.30 AM 48.9N 45.3W 990 55 102 post-tropical
Aug 24 3.30 PM 49.1N 38.7W 990 55 102 post-tropical
Aug 24 9.30 PM 49.4N 31.4W 990 50 93 post-tropical

3. Public weather impacts and warnings summary

All warnings ended for Newfoundland. Strong to gale force
West to northwest winds linger along the east coast of Newfoundland
until later this morning. Seas along the southern coast of the
Avalon are abating as Bill moves out to sea.

4. Marine weather impacts and warnings summary

At 0630 NDT a rig in the Northern Grand Banks reported southwest
Winds of 80 kts ... Suggesting that Bill remains a strong tropical
storm with surface winds 55-60 kts. Gales extend back to the east
coast of Newfoundland at forecast time.

Remaining storm warnings with Bill will likely be lowered later
This morning and gale warnings ended this afternoon.

5. Technical discussion for meteorologists

A. Analysis
The centre of Bill is clearly east of Newfoundland waters at
Forecast time. 11Z report from drifter buoy z44622 ... Just east of
The southern extent of the Funk Island Bank marine area ...Had
pressure of 991 MB and falling. It is likely that the centre of
Bill was near the buoy at that time.

Sustained gales extended as far back as Newfoundland coast until 10Z.

B. Prognostic

Bill moving rapidly in westerlies and we carry it only to 00Z before
discontinuing track as it will exit the CHC response zone this
afternoon. Nhc discontinued messaging on Bill at 09Z.

C. Public weather
Final meteorological storm values will be given in the final
hurricane bulletin to be issued by the canadian hurricane centre at
12:30 PM NDT.

D. Marine weather
It is no longer appropriate to speak about wind radii since the
gradient has filled in to nearly 400 NM behind Bill.

Final oceanographic storm values will be given in the final
Hurricane bulletin to be issued by the canadian hurricane centre at
12:30 PM NDT.

End March/campbell/bowyer




WOCN31 CWHX 241200
POST-TROPICAL STORM BILL INFORMATION STATEMENT ISSUED BY THE
CANADIAN HURRICANE CENTRE OF ENVIRONMENT CANADA AT 9.30 AM NDT
MONDAY 24 AUGUST 2009.

THE NEXT STATEMENT WILL BE ISSUED BY 12.30 PM NDT

... BILL MOVES AWAY FROM NEWFOUNDLAND.. TOWARD THE OPEN SEA ...

1. CURRENT POSITION, STRENGTH, CENTRAL PRESSURE AND MOTION

AT 9.30 AM NDT... POST-TROPICAL STORM BILL WAS LOCATED NEAR
LATITUDE 48.9 N AND LONGITUDE 45.3 W ... ABOUT 305 NAUTICAL MILES
OR 570 KM EAST NORTHEAST OF ST JOHNS. MAXIMUM SUSTAINED WINDS
ARE ESTIMATED AT 55 KNOTS... 102 KM/H... AND CENTRAL PRESSURE AT
990 MB. BILL IS MOVING EAST AT 42 KNOTS... 78 KM/H.

2. FORECAST POSITION, CENTRAL PRESSURE AND STRENGTH

DATE TIME LAT LON MSLP MAX WIND
NDT MB KTS KMH
AUG 24 9.30 AM 48.9N 45.3W 990 55 102 POST-TROPICAL
AUG 24 3.30 PM 49.1N 38.7W 990 55 102 POST-TROPICAL
AUG 24 9.30 PM 49.4N 31.4W 990 50 93 POST-TROPICAL

3. PUBLIC WEATHER IMPACTS AND WARNINGS SUMMARY

ALL WARNINGS ENDED FOR NEWFOUNDLAND. STRONG TO GALE FORCE
WEST TO NORTHWEST WINDS LINGER ALONG THE EAST COAST OF NEWFOUNDLAND
UNTIL LATER THIS MORNING. SEAS ALONG THE SOUTHERN COAST OF THE
AVALON ARE ABATING AS BILL MOVES OUT TO SEA.

4. MARINE WEATHER IMPACTS AND WARNINGS SUMMARY

AT 0630 NDT A RIG IN THE NORTHERN GRAND BANKS REPORTED SOUTHWEST
WINDS OF 80 KTS ... SUGGESTING THAT BILL REMAINS A STRONG TROPICAL
STORM WITH SURFACE WINDS 55-60 KTS. GALES EXTEND BACK TO THE EAST
COAST OF NEWFOUNDLAND AT FORECAST TIME.

REMAINING STORM WARNINGS WITH BILL WILL LIKELY BE LOWERED LATER
THIS MORNING AND GALE WARNINGS ENDED THIS AFTERNOON.

5. TECHNICAL DISCUSSION FOR METEOROLOGISTS

A. ANALYSIS
THE CENTRE OF BILL IS CLEARLY EAST OF NEWFOUNDLAND WATERS AT
FORECAST TIME. 11Z REPORT FROM DRIFTER BUOY Z44622 ... JUST EAST OF
THE SOUTHERN EXTENT OF THE FUNK ISLAND BANK MARINE AREA ...HAD
PRESSURE OF 991 MB AND FALLING. IT IS LIKELY THAT THE CENTRE OF
BILL WAS NEAR THE BUOY AT THAT TIME.

SUSTAINED GALES EXTENDED AS FAR BACK AS NEWFOUNDLAND COAST UNTIL 10Z.

B. PROGNOSTIC

BILL MOVING RAPIDLY IN WESTERLIES AND WE CARRY IT ONLY TO 00Z BEFORE
DISCONTINUING TRACK AS IT WILL EXIT THE CHC RESPONSE ZONE THIS
AFTERNOON. NHC DISCONTINUED MESSAGING ON BILL AT 09Z.

C. PUBLIC WEATHER
FINAL METEOROLOGICAL STORM VALUES WILL BE GIVEN IN THE FINAL
HURRICANE BULLETIN TO BE ISSUED BY THE CANADIAN HURRICANE CENTRE AT
12:30 PM NDT.

D. MARINE WEATHER
IT IS NO LONGER APPROPRIATE TO SPEAK ABOUT WIND RADII SINCE THE
GRADIENT HAS FILLED IN TO NEARLY 400 NM BEHIND BILL.

FINAL OCEANOGRAPHIC STORM VALUES WILL BE GIVEN IN THE FINAL
HURRICANE BULLETIN TO BE ISSUED BY THE CANADIAN HURRICANE CENTRE AT
12:30 PM NDT.

END MARCH/CAMPBELL/BOWYER

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000
WTNT33 KNHC 240840
TCPAT3
BULLETIN
TROPICAL STORM BILL ADVISORY NUMBER 36
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL032009
500 AM AST MON AUG 24 2009

...BILL LOSES TROPICAL CHARACTERISTICS...

AT 500 AM AST...0900 UTC...ENVIRONMENT CANADA HAS DISCONTINUED ALL
TROPICAL STORM WATCHES AND WARNINGS FOR NEWFOUNDLAND.

FOR STORM INFORMATION SPECIFIC TO YOUR AREA OUTSIDE OF THE UNITED
STATES...PLEASE MONITOR PRODUCTS ISSUED BY YOUR NATIONAL
METEOROLOGICAL SERVICE.

AT 500 AM AST...0900 UTC...THE CENTER OF BILL WAS LOCATED NEAR
LATITUDE 48.6 NORTH...LONGITUDE 50.2 WEST OR ABOUT 190 MILES...
305 KM...NORTHEAST OF CAPE RACE NEWFOUNDLAND.

BILL IS MOVING TOWARD THE EAST-NORTHEAST NEAR 43 MPH...69 KM/HR. AN
EAST-NORTHEAST MOTION WITH SOME INCREASE IN FORWARD SPEED IS
EXPECTED DURING THE NEXT DAY OR TWO.

MAXIMUM SUSTAINED WINDS ARE NEAR 70 MPH...110 KM/HR...WITH HIGHER
GUSTS. GRADUAL WEAKENING IS FORECAST DURING THE NEXT COUPLE OF
DAYS. EVEN THOUGH BILL IS NO LONGER A TROPICAL CYCLONE...IT IS
EXPECTED TO PRODUCE A LARGE AREA OF STORM AND GALE FORCE WINDS OVER
THE NORTH ATLANTIC DURING THE NEXT DAY OR TWO.

TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 315 MILES...510 KM
FROM THE CENTER.

ESTIMATED MINIMUM CENTRAL PRESSURE IS 980 MB...28.94 INCHES.

...SUMMARY OF 500 AM AST INFORMATION...
LOCATION...48.6N 50.2W
MAXIMUM SUSTAINED WINDS...70 MPH
PRESENT MOVEMENT...EAST-NORTHEAST OR 75 DEGREES AT 43 MPH
MINIMUM CENTRAL PRESSURE...980 MB

THIS IS THE LAST PUBLIC ADVISORY ISSUED BY THE NATIONAL HURRICANE
CENTER ON THIS SYSTEM. ADDITIONAL INFORMATION ON THIS SYSTEM CAN BE
FOUND IN HIGH SEAS FORECASTS ISSUED BY THE NATIONAL WEATHER
SERVICE...UNDER AWIPS HEADER NFDHSFAT1 AND WMO HEADER FZNT01 KWBC.

$$
FORECASTER BROWN/ROBERTS

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000
WTNT43 KNHC 240843
TCDAT3
TROPICAL STORM BILL DISCUSSION NUMBER 36
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL032009
500 AM AST MON AUG 24 2009

SATELLITE IMAGERY AS WELL AS RADAR AND SURFACE DATA FROM
NEWFOUNDLAND CANADA INDICATE THAT BILL HAS QUICKLY LOST TROPICAL
CHARACTERISTICS THIS MORNING. THE CLOUD PATTERN HAS BECOME
INCREASING ASYMMETRIC WITH THE STRONGEST WINDS AND COLDEST CLOUD
TOPS WELL REMOVED FROM THE CENTER. THE SYSTEM IS RAPIDLY MOVING
EAST-NORTHEASTWARD WITHIN A BAND OF STRONG UPPER-LEVEL WESTERLY
WINDS ASSOCIATED WITH THE SOUTHERN EXTENT OF A POLAR JET THAT IS
LOCATED JUST TO THE NORTH OF THE CYCLONE. THE INITIAL INTENSITY
ESTIMATE IS 60 KT...WHICH IS BASED PRIMARILY ON BUOY...SHIP...AND
LAND OBSERVATIONS THAT RECORDED 50-56 KT WINDS DURING THE PAST 6
HOURS. THE EXTRATROPICAL LOW IS FORECAST TO GRADUALLY WEAKEN
THROUGHOUT THE FORECAST PERIOD.

THE CYCLONE CONTINUES TO ACCELERATE EAST-NORTHWESTWARD WITH AN
INITIAL MOTION ESTIMATE OF 075/37. BILL SHOULD CONTINUE TO MOVE
RAPIDLY EAST-NORTHEASTWARD ACROSS THE NORTH ATLANTIC DURING THE
NEXT DAY OR SO. THE GLOBAL MODELS INDICATE THAT BILL WILL SLOW
DOWN AS IT INTERACTS WITH A LARGE EXTRATROPICAL LOW SOUTHWEST OF
ICELAND IN A COUPLE OF DAYS. THE MODELS SUGGEST THAT THE
EXTRATROPICAL REMNANTS OF BILL WILL BE ABSORBED INTO THE LARGER LOW
SHORTLY THEREAFTER. THE OFFICIAL FORECAST IS SIMILAR TO THE
PREVIOUS ADVISORY AND IS CLOSE TO THE MODEL CONSENSUS.

THIS WILL BE THE LAST NHC ADVISORY ON BILL. ADDITIONAL INFORMATION
ON THIS SYSTEM CAN BE FOUND IN HIGH SEAS FORECASTS ISSUED BY THE
NATIONAL WEATHER SERVICE...UNDER AWIPS HEADER NFDHSFAT1 AND WMO
HEADER FZNT01 KWBC.

FORECAST POSITIONS AND MAX WINDS

INITIAL 24/0900Z 48.6N 50.2W 60 KT...EXTRATROPICAL
12HR VT 24/1800Z 50.0N 41.5W 55 KT...EXTRATROPICAL
24HR VT 25/0600Z 51.5N 29.5W 45 KT...EXTRATROPICAL
36HR VT 25/1800Z 52.5N 19.0W 40 KT...EXTRATROPICAL
48HR VT 26/0600Z 55.0N 11.0W 35 KT...EXTRATROPICAL
72HR VT 27/0600Z 62.5N 1.0W 30 KT...EXTRATROPICAL
96HR VT 28/0600Z...DISSIPATED

$$
FORECASTER BROWN/ROBERTS