574  
AWCN10 CWTO 111225  
WEATHER SUMMARY  
FOR ONTARIO AND THE NATIONAL CAPITAL REGION  
ISSUED BY ENVIRONMENT CANADA  
AT 8:25 A.M. EDT THURSDAY 11 OCTOBER 2018.  
 
DISCUSSION.  
 
SUMMER-LIKE WARMTH AFFECTED SOUTHERN ONTARIO ON WEDNESDAY OCTOBER  
10TH WITH RECORD HIGH TEMPERATURES BEING REPORTED IN SOME AREAS. A  
COLD FRONT WILL CROSS THE REGION TODAY FROM WEST TO EAST BRINGING A  
RETURN TO MORE TYPICAL AUTUMN TEMPERATURES.  
 
IN STARK CONTRAST TO THE HEAT IN THE SOUTH, MUCH OF NORTHERN ONTARIO  
DEALT WITH A STRONG LOW PRESSURE SYSTEM GIVING HEAVY RAINFALL IN THE  
NORTHEAST AND SNOW, ICE PELLETS AND FREEZING RAIN ACROSS THE  
NORTHWEST. VERY SIGNIFICANT RAINFALL TOTALS HAVE BEEN REPORTED IN  
PORTIONS OF NORTHEASTERN ONTARIO. SOME OF THE MORE IMPRESSIVE VALUES  
ARE SUMMARIZED BELOW.  
 
NEW RECORD MAXIMUM TEMPERATURES FOR OCTOBER 10TH ARE SUMMARIZED IN  
THE TABLE BELOW.  
 
LOCATION AND NEW RECORD MAXIMUM TEMPERATURES.  
 
PEARSON INTERNATIONAL AIRPORT 26.8  
PREVIOUS RECORD 26.1 SET IN 1949  
RECORD KEEPING BEGAN IN 1938  
 
BUTTONVILLE AIRPORT 27.2  
PREVIOUS RECORD 26.9 SET IN 2011  
RECORD KEEPING BEGAN IN 1986  
 
HAMILTON AIRPORT 26.8  
PREVIOUS RECORD OF 25.5 SET IN 2011  
RECORD KEEPING BEGAN IN 1960  
 
TRENTON AIRPORT 25.6  
PREVIOUS RECORD OF 25.0 SET IN 1949  
RECORD KEEPING BEGAIN IN 1935  
 
OTTAWA INTERNTIONAL AIRPORT 27.5  
PREVIOUS RECORD OF 23.9 SET IN 1955  
RECORD KEEPING BEGAIN IN 1939  
 
SOME OF THE MORE SIGNIFICANT RAINFALL AMOUNTS IN MILLIMETRES IN  
NORTHERN ONTARIO ARE SUMMARIZED IN THE TABLE BELOW. THESE AMOUNTS  
INCLUDE RAINFALL FROM TUESDAY EVENING UNTIL 8 AM EDT TODAY.  
 
LOCATION AND RAINFALL IN MILLIMETRES.  
 
LAKE SUPERIOR PROVINCIAL PARK 100  
WAWA 95  
PUKASKWA 51  
CHAPLEAU 96  
SAULT STE. MARIE 78  
THUNDER BAY 46  
TIMMINS 80  
EARLTON 45  
 
PLEASE NOTE THAT THIS SUMMARY MAY CONTAIN PRELIMINARY OR UNOFFICIAL  
INFORMATION AND DOES NOT CONSTITUTE A COMPLETE OR FINAL REPORT.  
 
END/OSPC  
 
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