Special Weather Statement Issued by Environment Canada
A weather disturbance termed by meteorologists as a cold low has
arrived over the Great Lakes and is responsible for the unsettled
showery weather today. Scattered thunderstorms will affect parts of
southern Ontario this afternoon into this evening. A few of these
storms may briefly produce 1 to 2 centimetre hail and gusty winds to
70 or 80 km/h.
Conditions are also favourable for the development of funnel clouds
this afternoon and this evening. These types of funnel clouds form
out of large cumulus clouds or weak thunderstorms and normally do not
have enough energy to reach the ground.
However there is a risk that one of these funnels may briefly touch
down as a weak tornado and become destructive over a very small area.
Treat all funnel clouds and tornadoes seriously and avoid when
possible. Should one develop overhead, take shelter until it
dissipates. Remember, these funnel clouds will normally appear with
little or no warning.
The thunderstorm activity will gradually diminish this evening as
heating from the late June sun wanes.
Updated June 29
11am.... Summer is put on hold.
 It
appears that summer weather is going on a vacation for
this week as unsettled and cool conditions will
dominate. Increasing clouds across the Golden Horseshoe
will spark some showers and some scattered thunderstorms
later in the day.There is the chance of some of these
thunderstorms becoming severe later in the day with the
main threat being some small hail and gusty winds to
90km/h.
The jet stream will stay south of the
regions for this week and this will keep warm air from
moving northwwards into Southern Ontario. Temperatures
will hover into the low 20's for much of the work week.
There is a cold pool of air aloft and this is the reason
for the showes and thunderstorm development each day
this week. As the ground heats up and warm air rises, it
enters into the cool layer of air above and condenses.
As the warmer air continues to rise, clouds become
convective in nature and begin to from showers and
evenetually thundershowers.
Thunderstorm Potential
Forecast from Environment Canada
Today and tonight..Slight risk of isolated severe thunderstorms this
afternoon and evening over southern Ontario with 2 cm hail and wind
gusts approaching 90 km/h being the main threats. Otherwise over
Southern..Eastern and northeastern Ontario scattered non-severe
thunderstorms are expected mostly this afternoon and evening. These
Thunderstorms may contain small hail..Wind gusts to 60 km/h and
Brief heavy downpours.
Tuesday..Scattered non-severe thunderstorms are once again expected
Mostly in the afternoon and evening over southern..Eastern..And
Northeastern Ontario. Small hail..Brief heavy downpours and gusty
winds are the main issues. Some of these may approach severe limits
over parts of southern and eastern Ontario with large hail and brief
very strong wind gusts being the main threats.
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