The mild start to June across the northwestern United States will come to an end for a short time before warmth returns by next week.
Temperatures will be held at bay into the upcoming weekend as a storm system passes through the region.
“A dip in the jet stream will bring a brief end to the warm and dry start to June in parts of the West,” AccuWeather Meteorologist Ryan Adamson said.
The change to more cloudier and cooler air will begin on Thursday and continue on Friday.
“Along the leading edge of the cooler air, heavy to locally severe thunderstorms are forecast to erupt from parts of central and southwestern Montana to southeastern Idaho, western Wyoming and northern Utah into Thursday evening,” according to AccuWeather Senior Meteorologist Alex Sosnowski.
“Some cities at risk for storms with damaging winds and hail include Pocatello, Idaho; Helena, Montana; Jackson, Wyoming; and Salt Lake City,” Sosnowski said.
On Friday, locally severe storms will shift farther to the east across Wyoming and the western portion of the Dakotas.
Over the span of May 29 to June 5, temperatures averaged 3 to 7 degrees Fahrenheit above normal. This includes the cities of Seattle, Washington; Portland, Oregon; Boise, Idaho; and Great Falls, Montana.
At the height of the cooldown, temperatures will average 5 to 15 F below normal.
High temperatures will bottom out close to 60 F in Seattle and Portland on Friday. Normal high temperatures this time of year are in the upper 60s to lower 70s F.
Hikers and campers could get caught off guard with this push of cooler air and should be prepared to bring extra layers for the colder overnight hours.
The cool air will aid in the wildfire efforts across the region. The Highway 243 Fire, among others, continues to burn in Washington state.
Warmth will even be trimmed as far south as Central California, where portions of the San Joaquin Valley reached 100 F on Wednesday for the first time this year.
“Fresno, California, had its fist 100-degree day of the year on Wednesday, but temperatures will fall into the 80s F by Friday,” Adamson said.
The storm system passing across the region will also contain enough moisture for a few rain and snow showers.
“While the precipitation will not be overly heavy or steady, it can lead to some minor delays on roads and at local airports,” Adamson said.
Friday will likely be the wettest day across Seattle and Portland. Umbrellas and raincoats will be needed for those venturing outdoors.
A few strong to severe thunderstorms can erupt from northern Utah into central Montana on Thursday, capable of producing hail and locally damaging winds. The threat will then shift eastward into far eastern Montana and the northern Plains on Friday.
Little if any rain will reach northern portions of California. However, gusty winds will pick up from Friday night into Saturday.
As the cooler air arrives, snow showers can fall in some of the higher elevations.
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“Any snow should be confined to elevations above 6,000 feet, so the passes should not be impacted,” Adamson said.
A general 1 to as much as 3 inches of snow can fall through the end of the week.
The additional snow showers can add to the snowpack across several ski resorts and only add additional days to the already prolonged ski season. Many resorts have already extended their season past the Fourth of July.
This cooldown will not last long as warmer air is set to return by the end of the weekend.
“As the jet stream lifts back to the north, warmer and dry conditions will return to the West by the end of the weekend and into next week,” Adamson said.
Download the free AccuWeather app to see if or when rain will fall on your area and the best days for outdoor plans. Keep checking back for updates on AccuWeather.com and stay tuned to the AccuWeather Network on DirecTV, Frontier and Verizon Fios.
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