Yukon ; Northwest Territories ; Nunavut - First of all, I apologize for not been writing my weather blog since April 23. I had been spending this time in trying to edit my website. Those of you who are interested, can click on the "Back to Home Page" link above.

During this time I had been away from editing my blog, a major weather pattern change happened in the North. Noticeably, the North had significantly warmed up as we enter May, and some parts of the Arctic begins to receive almost 24-hour sunlight.

For areas south of the Arctic Circle, daily temperature highs have been reaching to the positive single digits. For traditionally colder areas (because of the colder Labrador Current flowing past), such as Baffin Island, the local temperature have been reaching as high as 5 C. Wet snow had been falling in the area, and it is forecasted that the local temperature may even reach as high as 11 C by the end of this week.

Towards the west shore of Hudson Bay, cold arctic air had been persistent in the area, and hence the coldest spot of the nation had been in these areas for the past 2 weeks. The locale also reached 0 C in some cases (i.e. Arviat, NU). Note that places such as Boothia Peninsula, Bathurst Inlet, are still way below the freezing mark with temperature around the negative double digits.

As we progress west to Yellowknife and Hay River area, the temperature had been holding steady at around 5 C for the past 2 weeks, when the warm air from Arizona and Texas attacked Alberta and Saskatchewan. The warm air was, at one point, so strong that it pushes the jet stream as north as Yellowknife. However, currently, the jet stream is nowhere near the 60th Parallel. The north has warm temperature solely because of the longer daylight hours.

The Yukon - Alaska Border, the westernmost frontier of Canada, is even warmer. Whitehorse had been reporting temperature in the positive double digits. And like Yellowknife, the reason for this warm up was that the longer daylight hours, invasion of warm air, etc.

Looks like the North is set for summer, but Southern Canada, hmm, not really. Southern Canada's temperature had been lingering in the double digits. Unlike April, Southern Canada's temperature had been holding steady around 13 to 19 C. Whereas in April, Southern Canada's temperature had soared as high as 30 C. One notable example would be Val Marie, Saskatchewan, which hit 29 C. This temperature still remains as the warmest value in Canada for 2008.

National - This blog entry is probably already covered in the news. Wacky weather we're having here across Canada, eh? Canadians have probably heard that it is snowy and frigid cold in the west, while blazing dry and hot in the east. Well, more wacky weather seems to be on the way, a switch of pattern in place! This is in store for next week. I'll explain more later in this entry.

Currently, a warm air mass that moved from the foothills of Alberta and into Eastern Canada stays stagnant in Eastern Canada. Meanwhile, chilly cold arctic air sweeps across the Western Prairies in order to replace the already moved warm air mass.

As of now, the warm air mass continues to advance north and east. The air mass is driven by the cold air from the west. There is currently several boundaries between this heat and the bonechill temperature. Much of Southern Ontario has already experienced the first one. As of 6 PM EDT, the front is pushing towards the Ottawa / St. Lawrence River Valley, scattering a thundershower or two. The front has not much use of all, frankly. The front is only responsible to change the wind direction, while only dropping Toronto's high tomorrow by only 3 C. There will be a stronger front during the weekend. This front will provide possibly heavy thundershowers (not necessarily severe thundershowers). Ahead of this front, warm air (like the Eastern Canadians are experiencing now) will continue to push up north and east. Behind this front is the bone chill cold temperatures from the prairies. This front will be a major weather maker for the weekend, and I will not be surprised if hail is reported. Behind this front, temperature will drop significantly. It is forecasted that for next Tuesday in Toronto, that cold rain will fall with a high of only 2 C. Forecasts also suggest possible wet snow in the suburban areas of Toronto and Muskoka regions. Winter again, Ontarians?

It looks like if this warm pocket of air continues to push north and east, it looks like that areas as north as southern Baffin Island, Iqaluit, Apex, can achieve temperature as high as 5 C. The current forecast models suggest the leading edge of the warm air will reach as far north as Qikiqtarjuaq, and later move into parts of Southern Greenland. This can be some major thawing for some Arctic residents.

Alright, now let me explain the switch in patterns. We already understands the cooling trend for Eastern Canada next week. I'll explain the warming trend for the West. This next warming trend is not going to be very impressive, but enough to bump the temperature in the Prairies up to the high single digits to mid teens. Currently, we are seeing a warm gulf of air near the shores of British Columbia, as well as south of the border near Washington State. These gulfs of air will eventually make way to the Prairies and the temperature will hence be bumped up. For example, temperature of Calgary will reach to 13 C by next Tuesday. Massive snowmelt is entirely possible, so beware of overflowing streams and flooded roadways.

See the pattern switch? While the east is bathing in heat for this Thursday (April 24), the west suffers from the bone chill temperatures. Next week, however, switch in patterns. The east will be suffering from cold rain and wet snow, while the west sees partly cloudy skies and temperature in the mid-teens. Well, I can only conclude with three words, EVERYTHING IS FAIR!

Southern ON (in particular GTA) - The long anticipated heat wave from Western Canada has finally arrived in Ontario and Quebec. This heat wave had pushed the mercury up as high as 29 C when it hit Saskatchewan on Tuesday. Now, finally, this air mass has struck much of Ontario, Quebec and parts of the Maritimes. In fact, the warm air is expected to stay within this locale for at least until mid-week next week. A stationary front has been formed to "protect" the locale from the cold air, but it is evident that this front is slowly pushing towards the east. During the time the locale is in the warmth sector, the locale can expect temperatures anywhere from 15 C - 28 C (or at least 5 C above seasonal average).

Markham, Ontario had reached a high of 26.9 C earlier today, setting this the record of the highest Ontario temperature so far of the year. Other "hot locals" include St. Catharine (26 C), Windsor (24 C), etc.

One thing that is worth noticing is that the daily high temperature today across much of Southern Ontario matches to what most of Florida is experiencing today. In Miami, the forecasted condition is partly cloudy with a high of 25 C, while Markham (or the GTA) achieved sunny skies and a high of 27 C.

There is also a general cooling trend across Canada. It is also noteworthy that Alberta is in for another spring snow event, up to 15 cm of snow can fall in Calgary area. This pocket of cold air will eventually move east, and Southern Ontarians cold expect cooler than normal temperatures about 1-2 weeks from now. It is forecasted that the temperatures then will only hit a daily high of around 5 to 15 C (10 degrees below seasonal to seasonal).

Alberta; Saskatchewan - After a long cool-down, and dull days (consistent cloud covers brought by troughs after troughs), finally sunny and hot days arrive!

A low pressure system situated near the coast of Queen Charlottes Island is tracking its way along the jet stream. To the east of this system, are warm, southerly, desert air from Arizona and parts of Texas in United States. This pushes the jet stream way to the north. It is forecasted that it is even possible for the jet stream to reach Beaufort Sea by Monday. Even Yellowknife, Northwest Territories may experience temperature as high as 11 C on Monday.

While this is good news for Alberta and Saskatchewan, it is, in fact, a bad piece of news for West Coasters. Heavy rain and winds are expected on the West Coast. Environment Canada had issued warnings to the locales earlier today.

Back to discussing the low pressure system. As the system advances towards the East, the warm air follows the low pressure system. The core of the warm air, has a high of 40 C in Texas! Right now, as of 17:09 MDT, Calgary experiences a temperature of 16 C; Edmonton experiences a temperature of 18 C. This is such a contrast to the previous snowfall on Thursday. Major snowmelt is expected, as the 23 cm of snow that had fallen on last Thursday melt under the warm 18 C and sunshine. Rivers can easily break its banks. For local residents, it is advised to move further up to higher grounds. It will continue be warm for Sunday in much of Alberta.

This system will continue advance to the East, and so will the warm air. By Monday, much of the heat will move into Saskatchewan, while Alberta is left with a cold front, cooling down the locale. By Tuesday, much of Alberta will cool down slightly back down to seasonal temperatures. Some non-severe thundershowers may be expected with the cold front. Meanwhile, Saskatchewan will be scorching in this summer's heat. According to the models, it looks as if the hot air mass' core will move as north as South Dakota. As a result, it is possible for Regina to reach 26 C as a daily high on Tuesday. For my personal forecast, I think the national warmest spot for Monday will be around Estevan in Saskatchewan, where the temperature might reach as high as 30 C (this is the extreme value, of course, the actual temperature for that day can be anywhere between 23 C to 30 C)!

By Tuesday, it is Manitoba's turn. This time, the heat's core moved back down south, and slightly weakened. As for Saskatchewan, once again, the temperature will return to slightly above average value (as opposite to way over average values). On Tuesday, Winnipeg can reach as high as 23 C (forecast calls for 20 C, but I think anywhere between 17 C to 23 C is possible).

By Wednesday, it will be Ontario's turn. Without any more description (I am sure you are bored with my descriptions), Toronto will reach 15 C, and warmer down towards Windsor, Sarnia, and London.

Windsor - Quebec Corridor, ON / QC - It is feeling more like May in Ontario and Quebec! Warm southerly flow brought by the warm front, which arrived in the morning hours for much of Ontario, and the noon hours for Eastern Ontario and Quebec, had brought the temperature up to 20s and upper teens! Windsor, hit 21.4 C yesterday, while in the Markham Weather Centre (my personal weather station), we hit a 20.0 C at 15:57 EDT, making it the warmest day so far in the season.

This is all thanks to the warm front, which brought some heavy thundershowers this morning across Southern Ontario (and noon for Eastern Ontario and Quebec). Behind it, a warm gust of southernly air from Texas and the Gulf of Mexico settled in. In the very heart of this airmass (which is in Texas), the local temperature soared up to 40 C!

Well, good things won't last long. A cold front have already swept through the Greater Toronto Area, as well as southwestern Ontario before we knew it. The front settled in these area during noon hours, when the area briefly clouded over, followed by the current sunshine. The winds shifted rapidly from southerly to westerly, and of course, with this, a stronger wind speed is recorded. Temperature will not rise any further for the rest of the daylight hours, and will drop to 3 C (for the GTA), as of tomorrow dawn hours.

After this warm shot of air, we have to deal with wintry conditions. It will be as if we have returned to early March in some cases on Friday. An incoming Colorado Low will stay south of us, but north enough to keep our precipitation as rain. Temperature will dip as low as 2 C (daytime high for Friday across the GTA), and a possible wet flurry or two during the overnight hours. We are expecting the low to linger across the weekend, dumping around 25 to 35 mm of rain throughout the weekend. A misery and cold weekend in store! More details will come later (I have a headache to deal with, and this wet snow business....)

As for the rain/snow line, the rough line will be drawn near the shores of Lake Huron, through Goderich, Wiarton, Owen Sound, Collingwood, Barrie, in through northern Peterborough County, eventually making its way to Renfrew County and Chelsea, Quebec. North of this line can experience primarily a snowfall event, accumulating as much as 10 to 15 cm in parts of northern Muskoka, and Parry Sound. Wow! So much for having temperature in the teens in the area today, then a wintry snow on Friday! Let's face the truth, winter is back! (momentarily, not for long, and of course, more details to come)

Markham, ON - The Colorado Low finally departed from us, and we have seen approximately 30 mm across the Greater Toronto Area, while significantly more (up to 50 mm) of rain across Cottage County, the "Nickel Belt", and Simcoe County. Barrie, Ontario had reported around 43 mm, for instance. They were primarily affected by the stationary warm front that "lags" the area, dumping continuous rain, while the GTA bathed in sunshine in the warm sector of the low pressure.

Cooler air funneled through behind the bulk of the system. With that, strong northwesterly winds affected much of Southern Ontario and Southeastern Quebec last night. Wind warnings were issued in some parts of these regions, as wind gusts were as high as 100 km/h in some open areas. In Toronto Downtown, the wind gust was reported at 89 km/h.

The cooler air affected the region today, as the high pressure comes along. Northerly flow of air gives Southern Ontario a cool, yet pleasant day. Most of Southern Ontario had reached their daytime high today, at 6 C for the GTA.

Tomorrow, as the high pressure tracks east, we will enter the sector where we see southerly flow from the high pressure (high pressure circulates clockwise), and hence, with that, a "bump" in temperature. Expect partly cloudy skies tomorrow and a high of 10 C for GTA, up to 17 C possible for Windsor and the Niagara Peninsula.

One last note... Windsor, Ontario and St. Catharines, Ontario made the national warmest spot for the past 3 days! Congratulations! We had not have this type of news since January!

National - We are already well past the spring equinox, which happened on March 20, 2008. Since then, we had past the equinox for 12 days, yet most of the country continues to experience winter like conditions. Good news is on the way, however.

According to our long term models (the temperature models for the next 7 days), we see temperatures above 0 C for majority of the populated regions of Canada, with the brief exceptions of Yellowknife, parts of Eastern Quebec, and Newfoundland. We are seeing a warm surge of temperature that will bounce up most of the country's temperature to above zero.

In the model, we are currently seeing only two more persistent cold air mass. The biggest airmass centres around Resolute, Nunavut; while the smaller one centres around just north of Newfoundland. The bigger airmass is constantly, more or less, moving, and has a centre temperature of about -20C. The smaller one is relatively stable, and has a centre temperature of about -10 C.

The first cold air mass keeps Northwest Territories and Nunavut way below the 0 C mark. The warmest part of Nunavut will only see up to -10 C in the next 7 days. The smaller air mass keeps Newfoundland, Labrador, and extreme Eastern Quebec below 0 C, keeping the temperature at around -5 C in the next 7 days. Occasionally, these cold air mass, during the next 7 days, move slightly towards the south, affecting parts of northeastern Saskatchewan, the entire Manitoba, northwestern Ontario, and parts of Northern Prince Edward Island, New Brunswick, and Nova Scotia. These areas during various time of the week, will have temperatures dipping down close to 0 C or slightly below 0 C (around -2 C). At other times, temperatures will stay above 0 C. The rest of the nation will stay above 0 C.