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Developing La Niña Event Could Mean Cool Summer

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Private weather forecaster WSI said April 19 the June-through-August summer season would average above normal in the eastern United States and central and southern Plains, and below normal in parts of the northern Plains, Rockies, and Southwest.

Weather Services International’s chief meteorologist Todd Crawford said a warm May, especially across the western U.S., would turn to a cooler-than-normal June across much of the northern U.S., likely lasting into July.

By late summer, as the impacts of a newly forming La Nińa event become more firmly established, Crawford said more widespread heat

Not sure what’s up with precipitation data across the Prairies, but it seems like no maps have been updated since April 13. This issue’s map shows the departure from average amounts of precipitation over the 30-day period from March 15 to April 13. With the exception of central Saskatchewan, most regions were running between zero and 20 millimetres below the long-term average during this period.

was expected. For the June-August period as a whole, WSI forecast 644 population-weighted cooling degree days, three to four per cent more than last year and about two per cent more than the 30-year mean.

Degree days, a measure of departure in the mean daily temperature from 8 C are used to reflect demand for energy to cool homes and businesses in summer and heat homes in winter months.

For the upcoming three-month period from May through July, WSI said temperatures would average cooler than normal in the northeastern U.S. and in California coastal cities and warmer than normal in most of the southern and western United States.

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