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How this upcoming heat wave in the Spokane area could be historic

Spokane's all-time record high is 108 degrees, and forecasts are already hotter.

SPOKANE, Wash. — Spokane and the Inland Northwest are about to experience a heat wave the likes we haven't seen in years, if not all time. Forecasts for temperatures in the 100s would easily break daily temperature records with some areas pushing the 110s. 

Now it appears that all-time high temperature records may be in danger of falling during this heat wave. In Spokane, the city hit 108 degrees on July 26, 1928 and again on August 4, 1961. KREM Chief Meteorologist Tom Sherry's forecast for Monday, June 28 and Tuesday, June 29 is 109.

Other all-time high temperatures records for the area include 110 degrees in Omak, 109 in Colville, 108 in Rosalia, and 105 in Bonners Ferry.

Between Saturday and at least Tuesday of next week, Spokane's highs will be in the 100s which is record breaking territory to begin with in terms of daily records. The daily record highs are between 98 to 105 from June 25-30. Spokane is already forecasting 109 at the peak of this heat wave.

Speaking of 105 degrees, it was June 28, 2015 when we hit 105 and thus set the hottest temperature recorded in the month of June. We all remember 2015 as a hot summer and on record it was the hottest summer ever in Spokane. This is just another record that could be broken.

There's one more record that could be tied or broken and that's the record for most consecutive days at or above 100 degrees. In July of 1928, Spokane was 100 degrees or more six straight days. This included that 108 degree record. As of not, KREM meteorologist are also forecasting a stretch of six straight day at or above 100.

Why is this happening and why is there such confidence that all these record are in danger, especially as we forecast five days in advance and then some? The weather pattern responsible for this is called a "Heat Dome." A massive area of high pressure that is purely hot through-and-through the atmosphere. 

The result of the hot air physically expands the atmosphere and pushes the jet stream and other weather systems far away from the anchor point. This results in long periods of extreme heat for all states underneath the heat dome.