The cool weather pattern that has dominated parts of central and eastern Canada this spring will prevail into the majority of the summer, while western Canada will have a warmer, drier summer compared to normal.
A persistent dip in the jet stream across central and eastern Canada will lead to an increase of cool spells in the region, especially during June and July. In addition to the jet stream pattern, the record extent of ice coverage over the Great Lakes this spring has delayed the normal warming of the lakes.
As a result, the lagging lake temperatures will have a cooling effect on the surrounding regions, including areas in and around Ontario, such as Thunder Bay, Sault Ste. Marie and Toronto, during the first half of the summer.
The combination of below-normal temperatures and lower humidity levels will reduce the threat for severe weather this summer from the eastern Prairies into northwestern Ontario.
While Atlantic Canada will experience a cool start to summer, the region will transition to conditions warmer and more humid than normal for the second half of the summer.
For the first half of summer, near-normal rainfall is expected across most of Atlantic Canada, including Halifax, Nova Scotia, and St. John's, Newfoundland.
However, for the second half of the season, the region will transition into a period of above-normal rainfall as a more moist, southerly flow takes over with the opportunity for heavier, tropical rainfall late in the summer.
Meanwhile, high pressure reigns, above-normal temperatures and less rainfall are predicted for much of British Columbia into areas in extreme western Alberta this summer.
The combination of increased heat and little rainfall, coupled with the ongoing Pine Bark Beetle infestation, will raise the risk for large wildfires along and west of the Continental Divide.
In Vancouver, British Columbia, the combination of high pressure and above-normal sea surface temperatures in the northeast Pacific will lead to a slightly warmer-than-normal summer with reduced chances for rainfall.
While portions of the mid-Atlantic have enjoyed a day or two of spring warmth in March, most of New York and New England will finally break out of the persistent winter chill.
A pattern change during the middle of April could bring rain and cooler conditions to California, while erasing persistent chill in the Northeast.
It was a very active day Monday along the "Ring of Fire," the zone of seismic activity in the Pacific Basin.
Rainfall has been excessive across the region since late February, AccuWeather.com Senior Meteorologist Jason Nicholls said.
It is no joke that severe weather will take aim at the central Plains on Wednesday, April Fools' Day.
As a cold front sweeps through the region early this week, record-breaking warmth in some areas will be replaced by cooler, seasonable temperatures.
Early heat wave, but the heat was welcome after a bitterly cold January. Binghamton, NY, reached 82 degrees, a new March record. Another March record was set in Hartford, CT, as the mercury there soared to 87. Baltimore Airport had a record high of 87, also a March record.
Flooding as a result of heavy rain on top of a heavy snowpack. Homes in Huntingdon county along the Juniata River were evacuated.
Philadelphia, PA (1998)
86 degrees; only 10 short of March record set March 29, 1945.