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“There is growing confidence in another extended period of unusually warm weather by the middle to the end of next week, and potentially as early as Tuesday in parts of the Pacific (Northwest),” the National Weather warned. Portland, Oregon service.
Other areas are also expected to sweat with above average temperatures, with the central United States experiencing it early in the week and then the northeast by mid-week.
Excessive heat monitoring is already in effect for parts of Washington, Oregon and California, and additional heat alerts will likely be added in the coming days as the incoming heat wave grips the region, the National Weather Service said.
A high pressure ridge along with an increase in the jet stream will move eastward from the North Pacific, reaching the Northwest by mid-week.
“Although it’s hot, the general trend is nothing like the record heat around the end of June,” the Portland National Weather Service office said.
“While this upcoming heat wave is unlikely to match the event at the end of June in terms of magnitude, there is still an increasing likelihood of an extended period of potentially dangerous heat.”
High temperatures for most of the northwest on Monday will be in the 70s and 80s, which is near average, but will increase until the 90s and 100s from Wednesday, becoming around 20 degrees above normal temperature for this time of year.
Only the mountain peaks and the immediate coast will escape the heat, with temperatures hovering into the 70s and 80s.
The most dangerous heat will occur in the second half of the week, particularly Thursday and Friday, for cities like Seattle, Portland and Medford, Oregon.
Portland is currently expected to hit at least 100 degrees for three consecutive days starting Wednesday. That’s the equivalent in duration of the late June heat wave for the city, but around that time, temperatures reached 116 degrees, shattering the city’s all-time record.
Temperatures this week will likely be around 10 degrees below that record, but the city is still expected to set daily records.
In Seattle, high temperatures could reach the mid-90s from Wednesday or Thursday, likely breaking the day’s record.
The lack of significant cooling during the night could also make this heatwave more dangerous for this part of the country.
“Nighttime lows are also expected to be quite warm during this time, falling in the 60s above or below 70 and potentially contributing to an increased risk of heat-related illness during this time,” the weather service warned.
Along with this heat there will be dry conditions with no rain expected for the northwest over the weekend once the ridge moves midweek.
The high pressure ridge will drift east by next weekend, bringing significantly above average temperatures to the interior of northwest and southwest Canada before temperatures cool down slightly next week.
Highs are expected to remain above average in the Northwestern United States for the extended future.
Heatwave this week for the North-East too
Another area of high pressure will also bring above average temperatures to much of the east this week, particularly the northeast.
Widespread high temperatures 5 to 15 degrees above average will be common in the central United States and the northeast interior to start the week.
The highs will be in the 90s and 100s in the Southern Plains, while they will be in the 80s and 90s for the Midwest during this time.
Heat advisories are in effect for more than 25 million people, including Dallas, Oklahoma City, Kansas City and St. Louis.
As the high pressure moves east, the heat will also shift, becoming more important for the northeast at the end of the work week. Some cities may even beat their daily record for high temperatures.
Cities like New York, Boston, and Washington, DC are expected to hit low in the mid-90s from Wednesday to Friday, but it will likely look like the 100s in some places taking into account the high humidity levels.
New York’s National Weather Service said it “appears there is growing potential for heat advisory criteria to be met from Wednesday to Friday next week for much of the region.”
With the warm, humid air mass and weak thunderstorm systems sweeping the north, there will be a risk of scattered thunderstorms much of this week in the northeastern United States. There is even the risk of a few severe storms, especially in the Midwest.
A cold front is then expected to sweep the northeast this weekend, paving the way for relief from the heat and sticky conditions and ending the risk of rain.
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