093  
WOCN31 CWHX 051457  
TROPICAL CYCLONE INFORMATION STATEMENT  
FOR EASTERN CANADA  
UPDATED BY ENVIRONMENT CANADA  
AT 11:57 A.M. ADT WEDNESDAY 5 AUGUST 2020.  
---------------------------------------------------------------------  
TROPICAL CYCLONE INFORMATION STATEMENT FOR:  
NEW BRUNSWICK  
METRO MONTREAL - LAVAL  
VAUDREUIL - SOULANGES - HUNTINGDON  
RICHELIEU VALLEY - SAINT-HYACINTHE  
LANAUDIERE  
EASTERN TOWNSHIPS  
BEAUCE  
DRUMMONDVILLE - BOIS-FRANCS  
MAURICIE  
QUEBEC  
MONTMAGNY - L'ISLET  
CHARLEVOIX  
KAMOURASKA - RIVIERE-DU-LOUP - TROIS-PISTOLES  
TEMISCOUATA  
RIMOUSKI - MONT-JOLI  
AMQUI - MATAPEDIA VALLEY  
MATANE  
SAINTE-ANNE-DES-MONTS - GRANDE-VALLEE  
GASPESIE NATIONAL PARK - MURDOCHVILLE  
RESTIGOUCHE - BONAVENTURE  
NEW CARLISLE - CHANDLER  
FORILLON NATIONAL PARK - GASPE - PERCE.  
 
---------------------------------------------------------------------  
==DISCUSSION==  
 
FOR POST-TROPICAL STORM ISAIAS.  
 
THIS IS AN UPDATED METEOROLOGICAL SUMMARY FOR POST-TROPICAL STORM  
ISAIAS. THIS WILL BE THE FINAL INFORMATION STATEMENT FOR THIS STORM.  
 
1. FULL DISCUSSION OF THE EVENT.  
 
ISAIAS IS CURRENTLY A POST-TROPICAL SYSTEM THAT IMPACTED MUCH OF THE  
CARIBBEAN AND THE ATLANTIC COAST OF THE UNITED STATES AS A CATEGORY  
1 HURRICANE. THE STORM STARTED DEVELOPING OFF THE COAST OF AFRICA,  
AND REACHED TROPICAL STORM STATUS ON JULY 30 AS IT MOVED WEST  
TOWARDS THE CARIBBEAN. THE NEXT DAY, ISAIAS REACHED HURRICANE  
STRENGTH WITH A MAXIMUM INTENSITY OF 137 KILOMETRES PER HOUR WITH A  
CENTRAL PRESSURE OF 997 MILLIBARS. THE STORM IMPACTED NORTH ANDROS  
IN THE BAHAMAS ON AUGUST 1 AND THEN WEAKENED TO A TROPICAL STORM AS  
IT MOVED UP ALONG THE EAST COAST OF THE UNITED STATES. AS IT MOVED  
TOWARDS THE CAROLINAS, IT RE-INTENSIFIED TO A CATEGORY 1 SYSTEM JUST  
BEFORE MAKING LANDFALL NEAR OCEAN ISLE BEACH IN NORTH CAROLINA, NEAR  
MIDNIGHT ON AUGUST 3. ISAIAS THEN REMAINED INLAND AS IT MOVED UP  
ALONG THE COAST TOWARDS NEW ENGLAND AS A STRONG TROPICAL STORM.  
NUMEROUS WARNINGS AND WATCHES WERE ISSUED FOR THE CARIBBEAN, THE  
BAHAMAS, AND MUCH OF THE EAST COAST OF THE UNITED STATES, INCLUDING  
HURRICANE WARNINGS AND WATCHES, AND STORM SURGE WARNINGS FROM THE  
CAROLINAS SOUTH.  
 
ON AUGUST 4TH, ISAIAS MOVED THROUGH NEW YORK INTO VERMONT, THEN  
CROSSED THE BORDER INTO QUEBEC THAT EVENING. WHILE WEAKENING  
GRADUALLY IT CONTINUED TO MOVE NORTHEASTWARD AND CROSS THE ST.  
LAWRENCE RIVER JUST EAST OF TROIS-RIVIERES. IMPACTS FOR CANADA WERE  
HIGH RAINFALL AMOUNTS, WINDS GUSTING TO STORM FORCE TUESDAY EVENING.  
THERE WAS SOME POSSIBLE LOCAL FLASH FLOODING, WITH WIDESPREAD  
RAINFALL AHEAD OF THE STORM IN THE 30 TO 60 MILLIMETRE RANGE, AND  
LOCALLY REACHING OVER 100 MILLIMETRES NEAR TROIS-RIVIERES AND WEST  
TO NORTH OF THE MONTREAL AREA. WIND GRADUALLY DROPPED OFF DURING THE  
EVENING AND OVERNIGHT, EXCEPT FOR PARTS OF THE ST. LAWRENCE RIVER,  
WHERE WINDS OF NEAR STORM FORCE PERSISTED INTO THE OVERNIGHT PERIOD.  
AREAS AROUND QUEBEC CITY SAW SOME WIND DAMAGE FROM FALLEN TREES AND  
SEVERAL THOUSAND WERE WITHOUT POWER TUESDAY NIGHT.  
 
THE STORM IS WEAKENING AS IT CONTINUES NORTH, WHERE IT WILL MERGE  
WITH A LOW PRESSURE SYSTEM AND THEN PASS EAST INTO LABRADOR.  
 
2. SUMMARY OF RAINFALL AMOUNTS IN MILLIMETRES IN QUEBEC:  
 
CHARLEVOIX (MASSIF): 124.7  
TROIS-RIVIERES: 90.2  
NICOLET: 85.7  
SHAWINIGAN: 82.6  
SAINT-JEAN-SUR-RICHELIEU: 69.6  
L'ACADIE: 65.7  
BOLOEIL: 65.3  
SAINT-HYACINTHE: 63.9  
SAINT-ARMAND: 59.2  
DESCHAMBAULTS: 57.3  
SAINT-GERMAIN-DE-GRANTHAM: 54.6  
LEMIEUX: 53  
STE-CLOTILDE: 51.0  
QUEBEC/JEAN LESAGE: 46.6  
SAINTE-FOY: 46.5  
DOLLARD-DES ORMEAUX: 45.2  
MONTREAL (DOWNTOWN): 45.0  
DEUX-MONTAGNES: 45.0  
LA TUQUE: 45  
FRELIGHSBURG: 43.4  
 
3. SUMMARY OF MAXIMUM WIND GUSTS IN KILOMETRES PER HOUR IN QUEBEC:  
 
ILE D'ORLEANS: 91  
BEAUPORT: 78  
QUEBEC/JEAN LESAGE: 69  
STE - FOY UNIVERSITY OF LAVAL: 63  
SHERBROOKE: 63  
ILES-AUX-GRUES: 57  
 
4. SUMMARY OF MAXIMUM WIND GUSTS IN KILOMETRES PER HOUR IN NEW  
ENGLAND AND MAINE:  
 
QUONSET AIRPORT: 98  
BRADLEY INTERNATIONAL AIRPORT: 91  
PROVIDENCE: 87  
BOSTON AIRPORT (LOGAN): 85  
WINDHAM AIRPORT: 83  
PORTSMOUTH: 82  
MT. WASHINGTON REGIONAL AIRPORT: 78  
 
5. SUMMARY OF MAXIMUM WIND GUSTS IN KILOMETRES PER HOUR IN THE GULF  
OF MAINE SOUTH TO LONG ISLAND, FROM BUOYS C-MAN STATIONS:  
 
STATION IOSN3: 74  
BUOY 44007: 70  
BUOY 44037: 67  
BUOY 44030: 63  
BUOY 44029: 57  
 
FORECASTER(S):MCARTHUR/MERCER  
 
PLEASE CONTINUE TO MONITOR ALERTS ISSUED BY THE CANADIAN HURRICANE  
CENTRE AND FORECASTS ISSUED BY ENVIRONMENT CANADA.  
 
HTTP://WEATHER.GC.CA  
 
END/ASPC  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab CANADA Page Main Text Page