Friday, 4 September 2015

Spectacular weather for Labour Day weekend

Summer 2015 is ending on a high note across much of Eastern Canada and the northeast US. Sunshine and much above normal temperatures are forecast across the entire region.

A weak backdoor cold front brought in a little cooler and dryer air overnight in Montreal. No precipitation fell in the city and we have had none so far this month. After a 28C (84F) high on Thursday we dropped to 14C (58F) this morning. High pressure will re-establish itself along the Eastern Seaboard into the upcoming holiday weekend with nothing but sunshine forecast through Sunday. Temperatures will rise from a high of 25C (77F) today to as warm as 32C (90F) on Monday, which is well above normal for early September. The normal high in Montreal is 22C (72F). The threat for precipitation will increase by late Monday in the form of showers and thunderstorms as a frontal boundary crosses the Great Lakes into Quebec. The weather will remain very warm and humid into Tuesday before we see any appreciable cooling.

Incidentally despite the warm weather, the leaves are rapidly changing colour and in some cases even falling off the trees. As we have learned in the past, cooler weather and frost accelerates this process, however it is the change in daylight that actually reduces the amount of chloraphyll in the leaves and generates the color. The leaves would change colour even if is stayed hot into October.

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