11/3/2023 0 Comments Meteorological phenomena ontarioToronto is situated by Lake Ontario and a lake breeze often develops during the day. One area of Thornhill, just north of the Toronto City limits recorded 175 millimetres (7 in) of rain in less than one hour. Studies were made to try to explain the change in behavior to an extremely high producer of rain. Convective storm detection showed on weather radars a hook echo, a BWER and a strong mesocyclone but the vortex left the ground after the second tornado. The Toronto Supercell maintained all the characteristics of a tornado producer as it approached the city. It produced winds of well over 100 km/h (62 mph), golf ball sized hail, but mostly heavy rain flooding many parts of the city between 2 and 4 pm. When the storm came close to the Greater Toronto Area, a tornado warning was issued, but the storm changed its characteristics. Severe thunderstorm warnings were sent, mentioning the possibility of tornadoes in view of the radar output and the potential analysis. At their worst, the tornadoes reached the F2 level, with gusts between 180 and 250 km/h (110 and 160 mph). Dozens of storm cells populated the line, two of them developing into tornadic supercells. They tracked eastward and reached as far as Oshawa during the afternoon. The first one was near Stratford, Ontario (20 km (12 mi) west of Kitchener), and spread as far north as Georgian Bay near Collingwood, Ontario while the second one was following behind near the shores of Lake Huron. With the advancing cold front, two lines of thunderstorms developed. Furthermore, the wind shear in the lower troposphere was creating a large helicity value conducive to a tornado potential. All of these were very favorable for the development of severe thunderstorms. As shown in the map to the left, there was up to 50 mm (2.0 in) of precipitable water in the warm air mass invading Southern Ontario with a strong southwesterly low level jet parallel to the cold front and the presence of an upper jet-stream. This same system had been causing an outbreak of tornadoes over Wisconsin the day before. ![]() ![]() On the early morning of August 19, a low-pressure area was sitting over Northern Michigan with a cold front southwestward. Meteorological events Composite weather map on the morning of AugTornadoes and downpour cells tracks with time shown in local time and their motion speed in yellow The Insurance Bureau of Canada has estimated that insured losses were the highest in the province's history, exceeding 500 million Canadian dollars, two and a half times that of Ontario's losses during the 1998 ice storm and the second largest loss event in Canadian history until another event of torrential rain of J(1 billion CAD). The storms morphed into heavy rain cells when reaching Toronto. A tornado was reported within the Toronto city limits, although this was never officially confirmed by the Meteorological Service of Canada. The Southern Ontario tornado outbreak of 2005 was a series of thunderstorms on the afternoon of August 19, 2005, that spawned tornadoes damaging homes in the Conestoga Lake, Fergus, and Tavistock areas. Supercell thunderstorm hitting Toronto and the surrounding suburbsġ Most severe tornado damage see Fujita scaleĢ Time from first tornado to last tornado
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