Hi guys,
I thought it would be interesting to post my personal weather outlook/predictions for this coming Spring, especially since the season is expected to officially commence in just a little less than a week's time (March 20th, at 1:32 p.m. EDT).
The reason for my prediction of a mild Winter this past year is simply because of the building El Nino signatures that were present since last Summer - in fact, this El Nino event turned out to be significant enough to become the 4th strongest since 1972-1973 once it reached its peak in early January. An El Nino event often causes extreme global weather anomalies when the signal is particularly high, as was the case for the last couple of months. Most notable events was the persistent dry weather in Australia (as well as the great flood and hailstorm in parts of Queensland recently), the record-breaking snowfall in the Northeastern U.S, frequent powerful Nor'Easters, numerous flooding events in parts of South America (such as in Argentina), severe wind storms and snowstorms in Europe, drought in parts of the Caribbean, frequent cold spells in the Southeastern U.S (particularly in Florida), a very inactive previous hurricane season, and an early start to tornado activity in the U.S Midwest. Just recently, too, there has been a severe windstorm as well as flooding in the Northeastern U.S. With respect to Canada, the story has been the persistent mild to warm weather combined with very little snow for most of the Winter across much of the country. As such, the polar jet stream was shifted further to the North during the Winter, allowing for steady flows of warm moist air to enter much of Canada, strengthening storm systems and making them numerous while keeping them South of the border, namely South of Eastern Canada.
December was likely the more Winter-like month, even though the harshest conditions happened to fall at the end of Autumn. However, the month was still above normal with respect to temperatures and possessed our only snowstorm (roughly 28 cm worth), so far, since November (November being one of the warmest on record). The two major cold spells occurred just past mid December and at the very end of January into the first few days of February. January was generally very warm, including a day possessing a daytime high nearly attaining 10 C (January 26th). Overnight lows very scarcely went below the -20 C threshold for the month (the coldest night being -21.6 C). Nearly 33% of the month had daytime highs above freezing. February continued on being as much as 3 degrees Celsius above average (both daytime highs and overnight lows) with very little snow - remember that large expanses of grass were exposed for the vast majority of the Winter. March has been stellar thus far with a real taste of Spring this past week - the feeling enhanced by the longer days and a stronger sun. Interestingly, this March may also not, for the first time in recorded history, have a single day where the temperature was below 0 C for daytime highs - I'm sort of crossing my fingers for that, especially since the weather could be briefly cooling down to seasonal standards once we advance past the arrival of Spring.
To put our accumulated snowfall (in Montreal, a city known for its snow) into perspective, using the 1971-2000 climate averages, our mean snowfall amount running from October to April is 217.5 cm, or ~7 feet. This year, we've only received 148.6 cm (shy of 5 feet), some 68 cm (just over two feet) less than the yearly average. However, the 149 cm value is a little deceiving as we need to remember that temperatures additionally were usually well above average, and so the actual snow depth on the ground never exceeded 20 cm (2/3 of a a foot) from December up until this point in time - this signals that much of the snow that did in fact fall was, more often than not, in the form of heavy wet snow. In that regard, daily maximum temperatures have been as much as 3-4 degrees Celsius above monthly averages while overnight lows seldom went below -15 C (certainly not a combination that is conducive to adequately freezing major bodies of water to an ideal depth). Needless to say, this has been a great Winter, especially after the harsh two consecutive ones we came across over the last two years, possibly due to, in part, La Nina. Summer of last year, too, was one of the coolest on record, so this Winter is, ideally, some compensation for that loss.

This is/was my kind of Winter...now if only every Winter season could exhibit conditions like this one...
As El Nino continues to dwindle slowly, I feel its lingering existence will allow for similar weather patterns across North America to persist this Spring, though with temperatures becoming milder, this should decrease the likelihood of major snowstorms (still very well possible, of course). Ideally, assuming a consistent jet stream pattern, this would cause our Spring in Eastern Canada to be overall dry in nature along with persistent mild conditions.
Summer is where it gets a little tricky, even though the models are exhibiting some similarities amongst themselves. I feel that this Summer may be quite the contrast from last year's with more incidences of hot and humid conditions, though an increase in severe weather/thunderstorms is also very possible in that regard due to elevated moisture content and warmer temperatures. Comparatively, however, although the Summer of 2005 was one of the hottest on record, there were surprisingly very few t-storms that erupted that year by contrast to 2006, which was also an El Nino year and a hot/humid one as well. El Nino is expected to significantly weaken by that point in time to likely neutral standards, but I pesonally feel that its effects will possibly continue to linger as a result of a delayed adjustment in global atmospheric circulation patterns to the changes in the Eastern equatorial Pacific. All in all, it is with a fair likelihood that we should witness a normal to above normal Summer this year with respect to temperatures. Assuming a warm, but dry Summer, my only concern, then, is that this may result in drought-like conditions since we've had so little snow this Winter and possibly below average rainfall for this Spring. Water levels, too, could remain at lower levels in that regard.
I also suspect that a weak El Nino could possibly continue into the Summer as opposed to completely dissipating, as illustrated in some of the models. Should that be the case, there is a chance that this will cause hurricane season to be below average/delayed in activity by the time we hit August. Other models suggest neutral conditions, favoring normal hurricane activity. It should be easier to make an assessment on hurricane activity by June.
There is my analysis as well as my personal predictions for the course of the next several months.
And just a reminder, don't forget to put your clocks one hour ahead before you go to bed tonight.
Trav.
