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Old 08-10-2013, 12:40 PM
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Default Re: Aug 7th 2013

EC summary:
Code:
Emailed to you at: Sat, 10 Aug 2013 06:28:57 -0400
 018 
 AWCN11 CWTO 101028
 UPDATED WEATHER SUMMARY FOR ALL OF SOUTHERN ONTARIO AND THE
 NATIONAL CAPITAL REGION ISSUED BY ENVIRONMENT CANADA
 AT 6:28 AM EDT SATURDAY 10 AUGUST 2013.

TWELFTH, THIRTEENTH AND FOURTEENTH TORNADOES OF THE SEASON  CONFIRMED.

THIS REPORT IS UPDATED TO INCLUDE INFORMATION FROM THE DAMAGE SURVEY
 CARRIED OUT FRIDAY NEAR CARNARVON.

A LINE OF SEVERE THUNDERSTORMS DEVELOPED LATE WEDNESDAY AFTERNOON
 FROM THE ARTHUR AREA TO ORILLIA TO NORTH OF MINDEN.  THESE
 THUNDERSTORMS TRACKED EASTWARD AND PRODUCED THREE CONFIRMED
 TORNADOES.

AN ENVIRONMENT CANADA STORM DAMAGE SURVEY TEAM TRAVELLED THE
 AREA FRIDAY AROUND CARNARVON, NORTH OF MINDEN, AND CONFIRMED THAT AN
 ENHANCED FUJITA SCALE ZERO (EF-0) TORNADO MOVED OVER THAT AREA
 WEDNESDAY AFTERNOON.  THE TORNADO TRACK WAS 2.25 KILOMETRES LONG.
 THE WIDTH OF THE TRACK WAS DIFFICULT TO DETERMINE AS THE TORNADO WAS
 MAINLY OVER THE WATER OF NEARBY BOSHKUNG LAKE.  NUMEROUS TREES WERE
 DOWN AS A RESULT OF THIS TORNADO.

THE ENHANCED FUJITA SCALE ESTIMATES THE WIND ASSOCIATED WITH A
 TORNADO BY THE DAMAGE IT CAUSES AND GOES FROM ZERO (WEAKEST) TO 5
 (STRONGEST). WINDS IN AN EF-0 TORNADO ARE BETWEEN 90 AND 130
 KILOMETRES PER HOUR.

AN ENVIRONMENT CANADA STORM INVESTIGATOR TRAVELLED THE AREA BETWEEN
 ARTHUR AND GRAND VALLEY THURSDAY AND CONFIRMED THAT AN ENHANCED
 FUJITA SCALE ZERO (EF-0) TORNADO MOVED THROUGH THAT AREA WEDNESDAY
 AFTERNOON.  THE TORNADO TRACK WAS 4.5 KILOMETRES LONG AND 100 METRES
 WIDE.

WITH A COMBINATION OF EYEWITNESS ACCOUNTS, IMAGES OF LOCALIZED DAMAGE
 AND OTHER PHOTOGRAPHIC EVIDENCE, AN EF-0 TORNADO WAS CONFIRMED IN THE
 ORILLIA AREA.

EYEWITNESS AND PHOTOGRAPHIC EVIDENCE WERE ALSO INSTRUMENTAL IN
 CONFIRMING A WATERSPOUT OVER HEAD LAKE IN THE NORTHERN KAWARTHA LAKES
 AREA WEDNESDAY AFTERNOON. AT THIS POINT IT APPEARS THE WATERSPOUT
 STAYED OVER THE LAKE AND DID NOT COME ONSHORE. IF EVIDENCE COMES TO
 LIGHT THAT THERE WAS A TRACK OF DAMAGE ONSHORE FROM THIS EVENT THEN
 IT WOULD ALSO BE CATEGORIZED AS A TORNADO.

ENVIRONMENT CANADA PERSONNEL CONTINUE TO INVESTIGATE THE NUMEROUS
 STORMS FROM WEDNESDAY AFTERNOON AND EVENING AND AS NEW INFORMATION
 BECOMES AVAILABLE THIS STATEMENT WILL BE UPDATED ACCORDINGLY.

IN ONTARIO 12 TORNADOES ARE VERIFIED ON AVERAGE EACH YEAR. THE TOTAL
 FOR THIS SEASON NOW STANDS AT 14. THE SUMMER SEVERE WEATHER SEASON IN
 ONTARIO NORMALLY RUNS FROM LATE APRIL UNTIL EARLY OCTOBER.


TIME AND LOCATION                         EVENT DESCRIPTION

4:30 P.M. ORILLIA                         CONFIRMED TORNADO  (EF-0)

5:00 P.M. CARNARVON                       CONFIRMED TORNADO  (EF-0)

5:50 P.M. ARTHUR-GRAND VALLEY             CONFIRMED TORNADO  (EF-0)

6:15 P.M. HEAD LAKE                       WATERSPOUT


THIS WEATHER SUMMARY CONTAINS PRELIMINARY INFORMATION AND MAY NOT
 CONSTITUTE AN OFFICIAL OR FINAL REPORT.

END/OSPC
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