Hi all and welcome to another Weather Wednesday. This week we are turning the corner, from fall to winter in a good-sized chunk of North America, possibly the whole continent. It usually happens from about now to December 21st at the latest and it of course, depends on when the ultra strong cold front will bring in the arctic air and freeze us all. I have some examples of how varied the corner has been turned, as the mercury takes a dive from above freezing to sub-freezing temperatures.
In 1989 just after November 11th it began to warm up from just above the freezing mark to about 18 degrees c or 64 f, with showers. In fact it happened on the 13th, when it was sunny and it was supposed to go up to 9 or 48. That’s when it heated up and set the stage for a sharp cold fron to move in on Wednesday November 15th and bring cold temperatures and snow. This of course, caused a lot of accidents and that was the start of a winter with 2 parts; one part was cold throughout almost all of December and the rest was mild with cold weekends and an early spring warm up.
This event came at the end of a warm fall, with the mercury staying around 20 degrees c for almost a couple of weeks, off and on throughout the season, untill that sharp cold front ended the party with heavy rain, wind and eventually snow.
Another example also came in a warmer than normal fall and it was in 2001, of course just after September 11th. The temperatures would be cooling off for a day then warm back up to around the same as 1989 but it took much longer for the weather to turn cold enough for an accumulation of snow on the ground. In fact it didn’t stay below freezing untill December 21st and it was also a mild winter with a cool wet spring in 2002.
As for this year, the weather is turning cooler today in Southern Ontario and we may just turn that corner but I’m not sure that will happen yet. We may be in for one more warm up before we go from waring no mits to bundling up. That has been the patern this fall, with a cool off but a prolonged warm spell for a few days before the cool off continues. Then again, we may just be turning the corner after all because this is a front which has swept through the American midwest and pushed temperatures below freezing south of the Canadian border. It may be a prolonged period of cold weather which will probably result in Southern Ontario going below freezing during the day for the first time this season. Actually, both examples I have sighted here happened in Southern Ontario.
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Another blog you may want to follow alongside this one is from Phil Chadwick. He is a retired meteorologist from Environment Canada and his specialty was severe weather. Here is the url.
Check it out if you are a weather nut. He has stuff in there that I didn’t even know. Well, after all, he did work for Environment Canada for many years and he retired in 2011.
Well, that’s it for today’s blog post. Talk to you on Sunday.