AWCN11 CWTO 212152
UPDATED WEATHER SUMMARY FOR ALL OF SOUTHERN ONTARIO AND THE
NATIONAL CAPITAL REGION ISSUED BY ENVIRONMENT CANADA
AT 5:40 PM EDT SUNDAY 21 JULY 2013.
-------------------------------------------------------------
==WEATHER EVENT DISCUSSION==
A HOT AND HUMID AIR MASS AHEAD OF A COLD FRONT PROVIDED THE PERFECT
COMBINATION TO SET OFF SEVERE THUNDERSTORM ACTIVITY ACROSS CENTRAL
AND SOUTHERN ONTARIO FRIDAY. THE SEVERE WEATHER BECAME EXTENSIVE
DURING THE AFTERNOON AND EVENING HOURS RESULTING IN THE BIGGEST
SEVERE WEATHER OUTBREAK OF THE SEASON. AN EXCEPTIONALLY LARGE AREA
WAS AFFECTED, FROM WINDSOR TO OTTAWA AND FROM LAKE ERIE TO NORTH BAY.
FRIDAY MORNING, THUNDERSTORMS GAVE SEVERE WIND DAMAGE TO CALLANDER
(NEAR NORTH BAY) RESULTING IN THE DECLARATION OF A STATE OF
EMERGENCY FOR THE TOWN.
SEVERE THUNDERSTORMS CONTINUED TO DEVELOP EASTWARD AND SOUTHWARD. IN
THE EARLY AFTERNOON, STORMS PRODUCED A SWATH OF DAMAGE FROM
PEMBROOKE TO PETAWAWA WHERE CARS WERE FLIPPED OVER, ROOFS BLOWN
DOWN, TREES UPROOTED, STREET LIGHTS SNAPPED, AND TRAILERS
OVERTURNED. BY LATE AFTERNOON, WIND DAMAGE WAS REPORTED IN DOZENS
OF COMMUNITIES IN A BROAD SWATH FROM LAKE HURON AND GEORGIAN BAY
THROUGH TO EASTERN ONTARIO.
THE SEVERE STORMS DEVELOPED SOUTHWARD DURING THE EVENING HOURS,
CAUSING WIND DAMAGE IN THE GOLDEN HORSESHOE AND IN SOUTHWESTERN
ONTARIO. FLOODING AND DOWNED TREES WERE REPORTED IN NIAGARA
FALLS WITH RAINFALL ESTIMATED AT 75 TO 100 MM. 150 MM WAS REPORTED
TO HAVE FALLEN AT RONDEAU BAY.
2 MINOR INJURIES WERE REPORTED IN CHATHAM LATE FRIDAY EVENING WHEN A
TREE FELL ON A CAR WITH THE PEOPLE IN IT.
HUNDREDS OF THOUSANDS OF RESIDENTS WERE LEFT WITHOUT POWER FOLLOWING
THE STORMS. AS OF SUNDAY MORNING, APPROXIMATELY 50,000 HOMES
REMAINED WITHOUT POWER.
ENVIRONMENT CANADA STORM DAMAGE TEAMS HAVE INVESTIGATED DAMAGE IN
BARRIE, ORILLIA, GRAVENHURST, HAMILTON, PETAWAWA, CALLANDER AND
DUFFERIN COUNTY. THE MOST SEVERE DAMAGE WAS FOUND NEAR
HONEYWOOD, IN DUFFERN COUNTY, WHERE ESTIMATED WINDS OF 150 KM/HR
DESTROYED A CATTLE BARN AND THREW THE ROOF 300 METRES. THIS DAMAGE
RATES F1 ON THE FUJITA SCALE. EVIDENCE THUS FAR INDICATES THAT
THE STORM DAMAGE IN ONTARIO HAS BEEN DONE BY STRAIGHT LINE DOWNBURST
WINDS.
BELOW IS A LIST OF THE MOST SIGNIFICANT DAMAGE REPORTS THAT
ENVIRONMENT CANADA HAS RECEIVED AS OF 4:00 PM SUNDAY.
-------------------------------------------------------------
TIME(LCL) LOCATION EVENT DESCRIPTION
10:50 AM CALANDER TREES DOWN AND UPROOTED, HOMES
DAMAGED, POWER OUTAGES
11:20 AM GRAVENHURST 2.5 CM HAIL
12:40 PM PETAWAWA AND ROOF DAMAGE, TRAILERS FLIPPED,
PEMBROOKE POWER OUTAGES
12:55 PM PETAWAWA PLAZA FRONT FACET OFF, WINDOWS BLOWN OUT,
ROOF CAVED IN
1:55 PM GRAVENHURST LARGE TREES DOWN, POWER LINES DOWN
2:30 PM COLDWATER TREES DOWN AND SNAPPED, POWER OUTAGES
2:45 PM GRAVENHURST CARS OVERTURNED
2:50 PM ORILLIA TREES DOWN, POWER LINES DOWN, STREET
LIGHTS SNAPPED
2:55 PM LAKE DALRYMPLE POWER LINES AND TREES DOWN
3:00 PM W OF OTTAWA ROOF DAMAGE, CROP DAMAGE, TREES DOWN
3:00 PM S OF GULL LAKE 150 TREES DOWN ON SOUTH MORRIS ISLAND
3:15 PM BARRIE FUNNEL CLOUD, TREES DOWN - CAUSED
DAMAGE TO HOMES
3:20 PM SE OF TREE DAMAGE
BRACEBRIDGE
3:20 PM BOBCAYGEON TREES UPROOTED
3:30 PM KANATA LARGE HAIL
4:00 PM N OF ARTHUR TREES DOWN
4:35 PM BARRIE BUILDING DAMAGE, TREES SNAPPED,
POWER OUTAGES
5:10 PM OTTAWA BRANCHES DOWN
5:10 PM BORDEN WIND GUST OF 96 KM/H
5:10 PM MULMAR BARN ROOF THROWN 300 METRES, BARN
DESTOYED NEAR HONEYWOOD, F1 DAMAGE,
WINDS ESTIMATED AT 150 KM/HR, F1
DAMAGE
5:15 PM NAPANEE TREES DOWN, GAS LEAKS, POWER OUTAGES
5:30 PM INNISFIL FUNNEL CLOUD, LIMBS DOWN
5:30 PM WATERLOO ARPT WIND GUST OF 119 KM/H, TREES DOWN
5:35 PM SW OF BRADFORD FUNNEL CLOUD
5:40 PM GUELPH DOZENS OF TREES SNAPPED OR UPROOTED,
HUNDREDS OF BRANCHES DOWN, DAMAGE TO
HOMES FROM FALLEN TREES OR LIMBS
5:45 PM CASSELMAN 53 MM RAIN
5:50 PM KITCHENER TREES DOWN - CAUSED DAMAGE TO HOMES,
-WATERLOO POWER OUTAGES, DAMAGE TO BUS SHELTER
5:50 PM STRATFORD TREES DOWN
5:55 PM PORT CARLING MATURE TREES DOWN, TREES SNAPPED
PORT SEVERN
5:55 PM GRAVENHURST LARGE TREES DOWN, POWER LINES DOWN
6:00 PM TORONTO PEARSON WIND GUST OF 104 KM/H
6:00 PM PARIS TREE DAMAGE, WOODEN BALCONY TORN OFF
HOUSE, CINDERBLOCK WAREHOUSE COLLAPSE
6:10 PM TORONTO TREES DOWN, INCLUDING A
HISTORIC CENTURY OLD TREE, POWER
LINES DOWN
6:30 PM HAMILTON TREES DOWN
6:45 PM STONEY CREEK TREES DOWN, TREES SNAPPED
7:05 PM HAMILTON ARPT WIND GUST OF 104 KM/H
7:10 PM ST CATHARINES TREES DOWN, 75-85 MM OF RAIN,
FLOODING
7:3O PM CHATHAM TREES DOWN, POWER LINES DOWN,
7:45 PM GRIMSBY TREES DOWN, POWER OUTAGES, 65 MM OF
RAIN
7:45 PM WATERDOWN TREES DOWN
8:20 PM CHATHAM-KENT TREES DOWN, POWER OUTAGES
8:30 PM ANCASTER TREES AND POWER LINES DOWN, SMALL
HAIL
8:45 PM NORWICH WIND GUST OF 90 KM/H, TREES DOWN
9:00 PM MULMUR BARN DAMAGE, CROP DAMAGE, ROOF
DAMAGE, POWER OUTAGES
9:10 PM HAMILTON ARPT WIND GUST OF 106 KM/H
9:20 PM MOUNT HOPE TREES DOWN, TRAMPOLINE BLOWN ONTO
ROOF, CROP DAMAGE
10:00 PM PORT COLBORNE WIND GUST OF 98 KM/H
11:00 PM PORT COLBORNE WIND GUST OF 93 KM/H, POWER OUTAGES
02:00 AM (SAT) WATERLOO ARPT WIND GUST OF 91 KM/H
REPORTS WITH EXACT TIME UNKNOWN:
ST GEORGE TREES AND HYDRO LINES DOWN
ESSEX COUNTY TREES DOWN
SIMCOE COUNTY TREES DOWN
RONDEAU BAY 150 MM RAIN
CHATHAM MINOR INJURIES TO TWO PASSENGERS OF
A CAR
WIARTON LARGE TREE UPROOTED
BLENHEIM TREES DOWN, FLOODED BASEMENTS, POWER
OUTAGES
NIAGARA FALLS 75-100 MM RAIN, FLASH FLOODING
BEAMSVILLE/ 75-85 MM RAIN, FLASH FLOODING
VINELAND
Sunday, July 21, 2013
Monday, June 17, 2013
Weather Event Discussion from EC - June 16th 2013
Updated weather summary for all of Southern Ontario and the
National Capital Region issued by Environment Canada
At 7:25 AM EDT Monday 17 June 2013.
-------------------------------------------------------------
==weather event discussion==
Several areas of thunderstorms roared across Southern and Eastern
Ontario, spawning numerous reports from Canwarn trained and
Ontario provincial police spotters of pea to marble sized hail,
frequent lightning, very heavy downpours and strong and gusty winds.
The strongest thunderstorms of the series from father's day roared
southeast from Lake Huron across the London area into St Thomas,
dumping hail as large as ping pong balls near Kettle Point and
resulting in tornado warnings for those regions. A funnel cloud was
seen by a Canwarn trained spotter just east of St. Thomas last
evening.
Severe weather reports received by Environment Canada as of 6.30
AM are found in the table below.
All watches and warnings have been ended by Environment Canada.
-------------------------------------------------------------
Time(lcl) location event description
7.00 PM 2 km E Kettle Point 4 cm hail 9.00 PM (EST'd)
E of St Thomas funnel cloud 9.20 PM Stayner area
pine trees down
10.10 PM Mount Albert 2 cm hail
11.05 PM Bowmanville 2 cm hail
National Capital Region issued by Environment Canada
At 7:25 AM EDT Monday 17 June 2013.
-------------------------------------------------------------
==weather event discussion==
Several areas of thunderstorms roared across Southern and Eastern
Ontario, spawning numerous reports from Canwarn trained and
Ontario provincial police spotters of pea to marble sized hail,
frequent lightning, very heavy downpours and strong and gusty winds.
The strongest thunderstorms of the series from father's day roared
southeast from Lake Huron across the London area into St Thomas,
dumping hail as large as ping pong balls near Kettle Point and
resulting in tornado warnings for those regions. A funnel cloud was
seen by a Canwarn trained spotter just east of St. Thomas last
evening.
Severe weather reports received by Environment Canada as of 6.30
AM are found in the table below.
All watches and warnings have been ended by Environment Canada.
-------------------------------------------------------------
Time(lcl) location event description
7.00 PM 2 km E Kettle Point 4 cm hail 9.00 PM (EST'd)
E of St Thomas funnel cloud 9.20 PM Stayner area
pine trees down
10.10 PM Mount Albert 2 cm hail
11.05 PM Bowmanville 2 cm hail
Friday, May 24, 2013
3rd and 4th Tornadoes confirmed in Ontario from May 21st 2013
AWCN11 CWTO 242021
Weather summary for all of Southern Ontario and the
National Capital Region issued by Environment Canada
At 4:16 PM EDT Friday 24 May 2013.
-------------------------------------------------------------
==weather event discussion==
Third and fourth tornadoes of the season confirmed.
…
Ongoing investigations by Environment Canada personnel in the wake of
the strong thunderstorms on May 21 have led to the confirmation of
two additional tornadoes on this day.
At approximately 1:30 PM EDT on Tuesday May 21, an enhanced Fujita
scale zero (ef-0) occurred near the community of Elmvale which is
about 18 kilometres south of Midland. The peak winds involved in this
event were between 90 and 130 kilometers per hour. The length of
damage was 570 metres and the maximum width was 50 metres. The
tornado uprooted or snapped about a dozen mature trees and did very
minor damage to a barn roof.
At approximately 2:00 PM EDT on Tuesday May 21, another enhanced
Fujita scale zero (ef-0) tornado occurred near the community of
dalston which is about 12 kilometres north of Barrie. The length of
damage was 4.5 kilometres and the maximum width was 500 metres. At
least 50 mature trees were uprooted or snapped off along the track
and the cap of a farm silo was damaged.
The enhanced Fujita scale is used to rate the intensity of tornadoes
and damaging wind events. The scale goes from zero (weakest) to 5
(strongest).
Ontario has had 4 tornadoes so far this year. Ontario normally has 12
tornadoes each year in a season that runs from late April until early
October.
Weather summary for all of Southern Ontario and the
National Capital Region issued by Environment Canada
At 4:16 PM EDT Friday 24 May 2013.
-------------------------------------------------------------
==weather event discussion==
Third and fourth tornadoes of the season confirmed.
…
Ongoing investigations by Environment Canada personnel in the wake of
the strong thunderstorms on May 21 have led to the confirmation of
two additional tornadoes on this day.
At approximately 1:30 PM EDT on Tuesday May 21, an enhanced Fujita
scale zero (ef-0) occurred near the community of Elmvale which is
about 18 kilometres south of Midland. The peak winds involved in this
event were between 90 and 130 kilometers per hour. The length of
damage was 570 metres and the maximum width was 50 metres. The
tornado uprooted or snapped about a dozen mature trees and did very
minor damage to a barn roof.
At approximately 2:00 PM EDT on Tuesday May 21, another enhanced
Fujita scale zero (ef-0) tornado occurred near the community of
dalston which is about 12 kilometres north of Barrie. The length of
damage was 4.5 kilometres and the maximum width was 500 metres. At
least 50 mature trees were uprooted or snapped off along the track
and the cap of a farm silo was damaged.
The enhanced Fujita scale is used to rate the intensity of tornadoes
and damaging wind events. The scale goes from zero (weakest) to 5
(strongest).
Ontario has had 4 tornadoes so far this year. Ontario normally has 12
tornadoes each year in a season that runs from late April until early
October.
CHILLY START TO THE DAY....
What a chilly morning... temperatures only around 4°C with gusty winds making it feel like zero.
Reports of flurries north and west of the city around Kitchener and Elora this morning.
Reports of flurries north and west of the city around Kitchener and Elora this morning.
Wednesday, May 22, 2013
EF-2 Tornado Confirmed in Glenarm, Ontario ... May 21st 2013
AWCN11 CWTO 230915
Updated weather summary for all of Southern Ontario and the
National Capital Region issued by Environment Canada
At 5:15 AM EDT Thursday 23 May 2013.
-------------------------------------------------------------
==weather event discussion==
Second tornado of the season confirmed in Ontario
An Environment Canada damage survey team has confirmed the
Occurrence of the second tornado of the season in Ontario. At
approximately 3 PM EDT Tuesday, near the small community of glenarm
about 12 kilometres to the west of Fenelon Falls, an enhanced Fujita
scale 2 (ef-2) tornado occurred. The main damage that verified this
rating was the roof being removed from a house in that area. This
damage is consistent with the low end of the ef-2 category or wind
speeds between 180 and 200 kilometres per hour. The enhanced Fujita
scale goes from ef-0 (weakest) to ef-5 (strongest). This tornado
Had a path length of 7 km and a width of 500 metres. There is also
sporadic damage along this path in the form of downed trees and one
destroyed older barn.
This is the second tornado of the season in Ontario. Ontario normally
has 12 tornadoes each year in a season that runs from late April
until early October.
In addition, a second damage path that was 10 km long was identified
to the southwest of Fenelon Falls. This damage appeared to be
Caused by straight line winds. There was also sporadic downed trees
and a destroyed older barn along this path, in addition to several
damaged cars at a car delearship from flying Debris.
Updated weather summary for all of Southern Ontario and the
National Capital Region issued by Environment Canada
At 5:15 AM EDT Thursday 23 May 2013.
-------------------------------------------------------------
==weather event discussion==
Second tornado of the season confirmed in Ontario
An Environment Canada damage survey team has confirmed the
Occurrence of the second tornado of the season in Ontario. At
approximately 3 PM EDT Tuesday, near the small community of glenarm
about 12 kilometres to the west of Fenelon Falls, an enhanced Fujita
scale 2 (ef-2) tornado occurred. The main damage that verified this
rating was the roof being removed from a house in that area. This
damage is consistent with the low end of the ef-2 category or wind
speeds between 180 and 200 kilometres per hour. The enhanced Fujita
scale goes from ef-0 (weakest) to ef-5 (strongest). This tornado
Had a path length of 7 km and a width of 500 metres. There is also
sporadic damage along this path in the form of downed trees and one
destroyed older barn.
This is the second tornado of the season in Ontario. Ontario normally
has 12 tornadoes each year in a season that runs from late April
until early October.
In addition, a second damage path that was 10 km long was identified
to the southwest of Fenelon Falls. This damage appeared to be
Caused by straight line winds. There was also sporadic downed trees
and a destroyed older barn along this path, in addition to several
damaged cars at a car delearship from flying Debris.
Weather Event Summary - May 21st 2013
AWCN11 CWTO 221029
Updated weather summary for all of Southern Ontario and the
National Capital Region issued by Environment Canada
At 6:21 AM EDT Wednesday 22 May 2013.
-------------------------------------------------------------
==weather event discussion==
Two clusters of thunderstorms blasted across Southern Ontario
Tuesday afternoon as the warm air of summer continues to battle a
much cooler airmass just to the north. There were quite a few
Reports of small hail, very heavy downpours, strong and gusty winds
and frequent lightning from the thunderstorms, which were also
responsible for a number of power outages.
There was damage to trees and buildings reported at cambray, which
Is southwest of Fenelon Falls, as the first area of thunderstorms
roared across. A team from Environment Canada will travel to the
Fenelon Falls area today to assess the damage.
These thunderstorms spawned a number of severe thunderstorm watches
and warnings which have since been discontinued.
Reports from severe thunderstorms received by Environment Canada as
of 6.00 AM today are found in the table below.
-------------------------------------------------------------
Time(lcl) location event description
1.50 PM Orangeville 2 cm diameter hail
3.00 PM stouffville 2-3 cm hail
3.30 PM cambray (sw Fenelon Falls) barn down
Trees down
Roof torn from a house
Power lines down
4.50 PM laurel (nw Orangeville) 2.5 cm hail
Updated weather summary for all of Southern Ontario and the
National Capital Region issued by Environment Canada
At 6:21 AM EDT Wednesday 22 May 2013.
-------------------------------------------------------------
==weather event discussion==
Two clusters of thunderstorms blasted across Southern Ontario
Tuesday afternoon as the warm air of summer continues to battle a
much cooler airmass just to the north. There were quite a few
Reports of small hail, very heavy downpours, strong and gusty winds
and frequent lightning from the thunderstorms, which were also
responsible for a number of power outages.
There was damage to trees and buildings reported at cambray, which
Is southwest of Fenelon Falls, as the first area of thunderstorms
roared across. A team from Environment Canada will travel to the
Fenelon Falls area today to assess the damage.
These thunderstorms spawned a number of severe thunderstorm watches
and warnings which have since been discontinued.
Reports from severe thunderstorms received by Environment Canada as
of 6.00 AM today are found in the table below.
-------------------------------------------------------------
Time(lcl) location event description
1.50 PM Orangeville 2 cm diameter hail
3.00 PM stouffville 2-3 cm hail
3.30 PM cambray (sw Fenelon Falls) barn down
Trees down
Roof torn from a house
Power lines down
4.50 PM laurel (nw Orangeville) 2.5 cm hail
Friday, May 17, 2013
Thunderstorm Potential Next Week.....
Possibility of thunderstorms next week perhaps Monday and Tuesday. Two convective weather indexes are showing the potential for some good thunderstorm activity. The lifted Index and Convective Available Potential Energy. Below is a brief ex...planation of the two indexes mentioned. There are other things to look at as well, but for now I will just talk about the following.
Lifted Index is the difference in temperature of a parcel of air that is lifted to particular height compared to it's surrounding environment. Positive values indicate stable atmospheric conditions. Negative values indicate instability. The greater the negative value, the more unstable the atmosphere is.
Convective Available Potential Energy or CAPE is the amount of energy a parcel of air would have if lifted to a certain height in the atmosphere. The higher the number the more energy that parcel of air has to lift. Values over 2500 are generally associated with severe weather.
There is also Convective Inhibition or CIN. This is basically the opposite of CAPE and inhibits convection from taking place or slows it down due to a temperature inversion near the surface. When CIN values are very negative (at least -100 or greater) air cannot rise past the inversion layer or the CAP. If CIN values are small (about -25 or so), convection may have enough energy to push through the inversion layer and thunderstorms will develop.
Lifted Index is the difference in temperature of a parcel of air that is lifted to particular height compared to it's surrounding environment. Positive values indicate stable atmospheric conditions. Negative values indicate instability. The greater the negative value, the more unstable the atmosphere is.
Convective Available Potential Energy or CAPE is the amount of energy a parcel of air would have if lifted to a certain height in the atmosphere. The higher the number the more energy that parcel of air has to lift. Values over 2500 are generally associated with severe weather.
There is also Convective Inhibition or CIN. This is basically the opposite of CAPE and inhibits convection from taking place or slows it down due to a temperature inversion near the surface. When CIN values are very negative (at least -100 or greater) air cannot rise past the inversion layer or the CAP. If CIN values are small (about -25 or so), convection may have enough energy to push through the inversion layer and thunderstorms will develop.
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