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.
Friday, May 24, 2013
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.
Thursday, May 16, 2013
Tuesday, May 14, 2013
Monday, May 13, 2013
FROST WARNING - May 13th 2013
SEVERE WEATHER BULLETIN
ISSUED BY ENVIRONMENT CANADA
AT 3:20 PM EDT MONDAY 13 MAY 2013.
---------------------------------------------------------------------
WATCHES/WARNINGS IN EFFECT FOR SOUTHERN ONTARIO...
FROST WARNING FOR:
CITY OF TORONTO
ELGIN
LONDON - MIDDLESEX
SIMCOE - DELHI - NORFOLK
DUNNVILLE - CALEDONIA - HALDIMAND
OXFORD - BRANT
NIAGARA
CITY OF HAMILTON
HALTON - PEEL
YORK - DURHAM
HURON - PERTH
WATERLOO - WELLINGTON
DUFFERIN - INNISFIL
GREY - BRUCE
BARRIE - ORILLIA - MIDLAND
BELLEVILLE - QUINTE - NORTHUMBERLAND
NAPANEE - CONSECON
KINGSTON - ODESSA - FRONTENAC ISLANDS
PETERBOROUGH - KAWARTHA LAKES
STIRLING - TWEED - SOUTH FRONTENAC
BANCROFT - BON ECHO PARK
BROCKVILLE - LEEDS AND GRENVILLE
CITY OF OTTAWA
GATINEAU
PRESCOTT AND RUSSELL
CORNWALL - MORRISBURG
SMITHS FALLS - LANARK - SHARBOT LAKE
PARRY SOUND - MUSKOKA
HALIBURTON
RENFREW - PEMBROKE - BARRY'S BAY
ALGONQUIN
BURK'S FALLS - BAYFIELD INLET.
WIDESPREAD FROST TONIGHT.
---------------------------------------------------------------------
==DISCUSSION==
CONDITIONS WILL BE MORE FAVOURABLE FOR FROST TONIGHT AS SKIES CLEAR
AND WINDS BECOME LIGHT IN A CHILLY ARCTIC AIR MASS. TEMPERATURES
WILL FALL TO ZERO SO WIDESPREAD FROST IS EXPECTED OVERNIGHT AND
EARLY TUESDAY MORNING.
TENDER PLANTS SHOULD BE PROTECTED OR BROUGHT INDOORS OUT OF THE COLD
THIS EVENING IF POSSIBLE.
ISSUED BY ENVIRONMENT CANADA
AT 3:20 PM EDT MONDAY 13 MAY 2013.
---------------------------------------------------------------------
WATCHES/WARNINGS IN EFFECT FOR SOUTHERN ONTARIO...
FROST WARNING FOR:
CITY OF TORONTO
ELGIN
LONDON - MIDDLESEX
SIMCOE - DELHI - NORFOLK
DUNNVILLE - CALEDONIA - HALDIMAND
OXFORD - BRANT
NIAGARA
CITY OF HAMILTON
HALTON - PEEL
YORK - DURHAM
HURON - PERTH
WATERLOO - WELLINGTON
DUFFERIN - INNISFIL
GREY - BRUCE
BARRIE - ORILLIA - MIDLAND
BELLEVILLE - QUINTE - NORTHUMBERLAND
NAPANEE - CONSECON
KINGSTON - ODESSA - FRONTENAC ISLANDS
PETERBOROUGH - KAWARTHA LAKES
STIRLING - TWEED - SOUTH FRONTENAC
BANCROFT - BON ECHO PARK
BROCKVILLE - LEEDS AND GRENVILLE
CITY OF OTTAWA
GATINEAU
PRESCOTT AND RUSSELL
CORNWALL - MORRISBURG
SMITHS FALLS - LANARK - SHARBOT LAKE
PARRY SOUND - MUSKOKA
HALIBURTON
RENFREW - PEMBROKE - BARRY'S BAY
ALGONQUIN
BURK'S FALLS - BAYFIELD INLET.
WIDESPREAD FROST TONIGHT.
---------------------------------------------------------------------
==DISCUSSION==
CONDITIONS WILL BE MORE FAVOURABLE FOR FROST TONIGHT AS SKIES CLEAR
AND WINDS BECOME LIGHT IN A CHILLY ARCTIC AIR MASS. TEMPERATURES
WILL FALL TO ZERO SO WIDESPREAD FROST IS EXPECTED OVERNIGHT AND
EARLY TUESDAY MORNING.
TENDER PLANTS SHOULD BE PROTECTED OR BROUGHT INDOORS OUT OF THE COLD
THIS EVENING IF POSSIBLE.
Chilly Morning For The Golden Horseshoe
Certainly not the your typical temperatures for the middle of May. Cold air across the region will only get temps up to the upper single digits for this afternoon. Some instability across the region will also spark off some showers and possible ice pellets/snow pellets this afternoon due to cold air aloft.
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