WOCN31 CWHX 061932 CCA  
INTERMEDIATE TROPICAL CYCLONE INFORMATION STATEMENT CORRECTED BY THE  
CANADIAN HURRICANE CENTRE OF ENVIRONMENT CANADA  
AT 4:32 PM ADT SUNDAY 6 JULY 2014  
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INTERMEDIATE TROPICAL CYCLONE INFORMATION STATEMENT FOR:  
      NOVA SCOTIA  
      PRINCE EDWARD ISLAND  
      NEW BRUNSWICK.  
  
      FOR POST-TROPICAL STORM ARTHUR.  
  
      *** CORRECTIONS: CHARLOTTETOWN 'PEI' IN SUMMARY TABLE, NOT  
      'NS'. ALSO MODIFIED WORDING REGARDING RAIN-RELATED FLOODING IN  
      NEW BRUNSWICK AND ADDED SOME NEW DATA. ***  
  
      THIS IS A SPECIAL METEOROLOGICAL SUMMARY FOR POST-TROPICAL  
      STORM ARTHUR.  
  
      THIS IS THE FINAL STATEMENT BY THE CANADIAN HURRICANE CENTRE  
      ON THIS STORM.  
  
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INTERMEDIATE TROPICAL CYCLONE INFORMATION STATEMENT ENDED FOR:  
      NEWFOUNDLAND  
      QUEBEC MARITIME.  
  
      ALTHOUGH THE LINGERING EFFECTS OF ARTHUR ARE STILL OCCURRING  
      OVER PARTS OF THESE REGIONS, THIS BULLETIN IS SERVING AS A  
      SUMMARY REPORT FOR THE PRIMARY AFFECTED AREAS AROUND THE  
      MARITIME PROVINCES.  
  
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==DISCUSSION==  
  
*** METEOROLOGICAL SUMMARY OF THE EVENT ***.  
  
HURRICANE ARTHUR TRANSFORMED INTO A POTENT POST-TROPICAL STORM OVER  
THE MARITIME PROVINCES ON SATURDAY JULY 5 2014 CAUSING SIGNIFICANT  
TREE DAMAGE AND REPORTS OF FLOODING IN MANY AREAS. THE  
TRANSFORMATION WAS A RESULT OF THE MERGING OF THE HURRICANE WITH A  
COLD FRONT - SIMILAR TO HURRICANE IGOR IN NEWFOUNDLAND IN 2010 - BUT  
OBVIOUSLY FARTHER WEST AND NOT AS SEVERE.  
  
THIS EVENT AS WELL AS OTHERS LIKE IGOR HIGHLIGHT THAT WHEN A  
HURRICANE BECOMES A POST-TROPICAL STORM IT IS NOT ALWAYS A  
'DOWNGRADE'.  IN FACT, WHEN THESE STORMS UNDERGO THE TRANSFORMATION  
TO POST-TROPICAL STATUS, THE AREA OF HIGH WINDS (AND RAIN) EXPANDS  
SIGNIFICANTLY EVEN THOUGH THE HIGHEST WINDS AND HEAVIEST RAINFALL  
INTENSITY IN THE STORM MAY DECREASE A BIT. AS A RESULT A WIDER AREA  
IS AFFECTED AND THE STORM'S TOTAL ENERGY ACTUALLY INCREASES IN MANY  
CASES.  IN THE CASE OF ARTHUR THE HIGHEST WINDS AT THE END OF ITS  
HURRICANE STATUS WERE ABOUT 120 KM/H AND DURING THE HOURS AFTER WE  
DECLARED IT POST-TROPICAL THE HIGHEST WINDS WERE STILL AROUND 110  
KM/H (WHICH WE SAW IN THE FORM OF GUSTS OVER LAND).  
  
VIGOROUS HURRICANE TRANSFORMATIONS LIKE THIS HAVE STRONG WINDS NOT  
ONLY TO THE RIGHT OF WHERE THE STORM CENTRE (LOWEST PRESSURE) TRACKS  
BUT ALSO SLIGHTLY TO THE LEFT OF THE TRACK AS WE SAW DURING THIS  
STORM AND OTHERS SUCH AS IGOR OVER NEWFOUNDLAND IN 2010. THESE  
LEFT-OF-TRACK WINDS ARE USUALLY FROM THE NORTH, NORTHWEST OR WEST  
AND ARE WHAT WE REFER TO IN METEOROLOGY AS A "STING JET". IT WAS  
THIS SO-CALLED "STING JET" THAT CAUSED THE HIGH WINDS AT  
FREDERICTON, ACROSS PARTS OF THE WESTERN HALF OF NOVA SCOTIA AND  
SPECIFICALLY THE ANNAPOLIS VALLEY. WE EMPHASIZED THESE WINDS IN  
THE FORECAST BULLETINS AND DURING MEDIA INTERVIEWS. THIS IS NOT A  
NEW PHENOMENON - BUT IS A TERM NOT OFTEN REFERRED-TO IN TRADITIONAL  
WEATHER FORECASTS.  
  
WHAT WAS EXCEPTIONAL ABOUT THIS STORM WAS THE EXTENT OF THIS WIND  
FEATURE TO THE LEFT (NORTHWEST) OF THE STORM TRACK - IN FREDERICTON  
- AND THE PEAK STRENGTH OF IT OVER THE ANNAPOLIS VALLEY WITH THE  
EXTREME GUST OF 138 KM/H AT THE GREENWOOD D.N.D. BASE. ALSO OF NOTE  
WITH THESE TYPES OF STORMS IS THAT THERE CAN BE VERY LITTLE RAIN AND  
EVEN SUNSHINE ON THE RIGHTHAND SIDE (USUALLY SOUTH) OF THE STORM  
CENTRE/TRACK. RAINFALL IS TYPICALLY VERY HEAVY NORTH (LEFT) OF THE  
STORM TRACK WHERE THE COLD FRONT ACTS AS A CONDUIT FOR THE MOISTURE  
FROM THE HURRICANE.  
  
THE GASPE REGION OF QUEBEC AND THE MAGDELAN ISLANDS WERE AFFECTED  
WITH HIGH WINDS AS WELL WITH GUSTS FROM 80 TO NEAR 100 KM/H. DAMAGE  
WAS PARTICULARLY BAD IN CARLETON-SUR-MER, QUEBEC ON THE OPPOSITE  
SIDE OF THE BAY OF CHALEUR NEAR DALHOUSIE, NEW BRUNSWICK. THIS MAY  
HAVE BEEN A RESULT OF TERRAIN-INDUCED ENHANCEMENT OF THE WINDS.  
NEWFOUNDLAND IS STILL BEING AFFECTED AT THE TIME THIS BULLETIN WAS  
ISSUED.  
  
THE OFFICIAL STATUS OF ARTHUR AT LANDFALL WAS A  
NEAR-HURRICANE-STRENGTH POST-TROPICAL STORM WITH MAXIMUM WINDS OF 60  
KNOTS (110 KM/H). THE LANDFALL LOCATION OF THE CENTRE WAS IN THE  
VICINITY OF PORT MAITLAND / METEGHAN IN WESTERN NOVA SCOTIA.  
THE CENTRAL PRESSURE AT LANDFALL WAS 980 MB (28.94").  
  
LISTING OF KNOWN TOP WIND SPEEDS:  
  
MAXIMUM GUSTS (KM/H):  
---------------------------------------------  
  
GREENWOOD, NS           138  
BRIER ISLAND, NS        128  
FIVE ISLANDS, NS        127 *  
YARMOUTH, NS            111  
LUNENBURG, NS           108  
CHARLOTTETOWN, PEI      105  
FREDERICTON, NB         100  
  
LISTING OF KNOWN TOP RAINFALL AMOUNTS:  
  
TOTAL RAINFALL (MM):  
---------------------------------------------  
  
GAGETOWN RWN, NB        150 **  
ST. STEPHEN, NB         143  
NOONAN, NB              140  
MILLVILLE, NB           127  
MIRAMICHI, NB           122  
  
MUCH LESS RAINFALL IN PRINCE EDWARD ISLAND AND NOVA SCOTIA. YARMOUTH  
HAD 52 MM AND WESTERN PEI HAD 27 MM (NORTH CAPE). GASPE RECORDED 67  
MM.  
  
* VOLUNTEER WEATHER OBSERVER.  
** HIGHEST REPORT FROM A NETWORK OF TOWERS AT GAEGETOWN D.N.D.  
  
OFFSHORE WAVES:  
  
BUOY 44024      5.4 M  
BUOY 44258      6.9 M (MOUTH HALIFAX HARBOUR)  
BUOY 44150      9.0 M  
  
END/FOGARTY