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Weekend Weather Update (26-28 June 2015)
Topic Started: Jun 26 2015, 03:47 AM (50 Views)
Webster
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Accuweather: Extreme Heat To Bake West This Weekend

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A developing upper-level high will spread triple-digit heat into the Northwest this weekend and beyond.

According to AccuWeather Long-Range Meteorologist Paul Pastelok, "A large upper-level high will build over the West late this week and persist into the beginning of July."

Many cities across the Northwest will witness triple-digit heat for the first time this season. "High temperatures will be 20 to 30 degrees above normal in some areas," Pastelok said.

Record-high temperatures will be challenged or broken this weekend including the cities of Seattle; Portland, Oregon; Missoula, Montana; Boise, Idaho; Reno, Nevada; and Salt Lake City. "The hottest weather will occur this weekend with the hottest day more likely to be Sunday over Saturday across inland areas," According to AccuWeather Western U.S. Expert Ken Clark.

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"Many areas east of the Cascades this weekend will be over 100 F and some places can exceed 110 F," Clark said. Not only will the Northwest deal with triple-digit heat over the weekend, the Desert Southwest will continue to have day-after-day of high temperatures nearing 110 F, including Las Vegas and Phoenix, Arizona.

The building drought and dry ground across the West will assist in temperatures rising rapidly throughout the daylight hours.

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This extreme heat, along with low humidity, will bring little to no relief to the wildfires currently spreading across portions of California, Oregon and Arizona. According to AccuWeather Meteorologist Evan Duffey, "With fires springing up already across much of the Western states, high heat will slow firefighters by testing their physical limits and threatening heat-related illness."

"At the same time, high heat will allow fuel temperatures to rise, increasing the risk of ignition and spotting and increasing the chances for extreme fire behavior," he added.

This heat will make it feel uncomfortable for anyone heading to weekend festivities including the Camlann Medieval Village Midsomer Festival near Seattle; the 39th Annual Utah Arts Festival in Salt Lake City; the Boise Music Festival in Boise, Idaho; or the Festival of Balloons Soccer Tournament near Portland, Oregon.

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Be sure to stay out of fierce sunlight and drink plenty of water for anyone heading outside for weekend activities. Wear light-colored clothing and avoid strenuous activities.
The best ways to beat the heat are to stay in air-conditioned buildings or travel to the beaches along the coasts of Washington, Oregon and California.
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Webster
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Accuweather: Wet Weekend Shaping Up For Northeast

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After powerful thunderstorms struck the Northeast early in the week, the weekend will end up soggy for many with flooding also possible in some areas.

A storm system over Illinois and Indiana will become more organized Friday afternoon and set its sights on the Northeast for the weekend. Saturday's rain will mainly focus from southern Ontario to western New York and Pennsylvania, including the cities of Cleveland, Ohio; Buffalo, New York; Rochester, New York; and Pittsburgh and Erie, Pennsylvania.

The heaviest rain is expected Saturday night, shifting from western Pennsylvania to central New York and to the I-95 corridor from Boston to Washington, D.C.

Outdoor events this weekend ranging from camping trips and weddings to pool days could require alternate planning. Baseball games from Friday evening through Sunday afternoon could have rain delays. This includes three home games for the Pittsburgh Pirates against the Braves at PNC Park and games Saturday and Sunday at Citi Field, as the New York Mets take on the Cincinnati Reds.

With this persistent rain, some downpours will also be possible, bringing the risk for flooding. "With the slow-moving nature of this system and its gradual strengthening, heavy rain is inevitable," AccuWeather Meteorologist Evan Duffey said. "Through Saturday and Sunday, a swath of 1 to 2 inches (25 to 55 mm) will be across the Northeast, with locally higher amounts," Duffey said.

With rainfall totals of this magnitude, some flooding problems may occur. "We do not expect widespread flooding but more rather small stream flooding in south-central and southeastern Pennsylvania," Senior Hydrologist at the National Weather Service Middle Atlantic River Forecast Center Scott Kroczynski said.

Heavy rain is likely to fall farther to the west over Pennsylvania, parts of Ohio and western New York. These areas have the potential for flash, urban and small stream flooding.

Flooding on roadways and poor drainage areas is also possible in the heaviest rain. Some major highways where traffic could be affected by downpours in this rainstorm include I-70, I-79, I-80, I-81, I-86, I-88 and I-90 during Saturday and Saturday night. Eastern parts of I-90 and I-87 will have more travel delays Saturday night into Sunday.

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AccuWeather Chief Meteorologist Elliot Abrams explained that this rain comes as nature's way of balancing out the persistent dry weather in the West. "This setup will end the extreme heat wave that has been baking the Southeast," Abrams said.

He further explained that the shape of the system in the Northeast and its exact track could make the difference between widespread flooding and just cooler conditions with showers and thunderstorms.

With the track of the system now shifting farther north, the weekend looks like heavy rain will pass through in addition to a more refreshing air mass for much of the East Coast by late Sunday.
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DrLeftover
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We've got more thunderstorms. Tornado watch. Flash flood warning. Etc.
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Webster
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DrLeftover
Jun 26 2015, 12:00 PM
We've got more thunderstorms. Tornado watch. Flash flood warning. Etc.
Stay safe out there, Doc.
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Webster
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Accuweather: Triple-Digit Heat, Lightning To Increase Wildfire Risk In Western U.S.

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Soon after temperatures surge to record high levels in the Northwest this weekend, a disturbance will roll in from the Pacific Ocean with spotty storms and dry lightning.

Record high temperatures will be challenged from Seattle to Salt Lake City this weekend. High temperatures will reach 100 F from the deserts to the upper part of the Great Basin, the Snake River Basin and part of the Northwest during one or both days of the weekend.

According to AccuWeather Chief Long Range Meteorologist Paul Pastelok, "Much of the West, especially the Northwest will remain hot into early July." The only cool spots will be right along the California coast, due to a sea breeze.

Be sure to avoid strenuous activity this weekend into this week. If you will be outside for lengthy periods, be sure to drink plenty of water, avoid direct sunlight and where light-colored and light-weight clothing.

The combination of ongoing heat, dry landscape, low humidity and lack of rain will continue the wildfire threat over much of the West. According to AccuWeather Meteorologist Evan Duffey, who is also a volunteer firefighter, the extreme conditions in the West will test the physical limits of firefighters.

"At the same time, high heat will allow fuel temperatures to rise, increasing the risk of ignition and increasing the chances for extreme fire behavior," Duffey said.

Even though temperatures will throttle back a little early this week, the risk of wildfires will continue and may increase substantially as a moisture-starved system moves in from the Pacific Ocean.

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This disturbance will produce spotty thunderstorms, but not the type that bring drenching rainfall in most cases. Many of the storms that occur will bring dry lightning strikes, or simply lightning without rainfall.

The system will track from the Northwest coast Sunday night into Monday, to the interior Northwest and northern Rockies Monday night into Tuesday. Meanwhile, over parts of New Mexico, Arizona and interior Southern California, enough moisture may pulse northward from Mexico to produce storms with little rainfall and dry lightning as well, during this weekend into early this week.

"Prior to the middle of July, a series of storms from the Pacific will attempt to chop down the heat in the Northwest," Pastelok said. "The pattern shift could cause extreme heat in the Southwest, prior to another surge of moisture and a ramp up of the monsoon in the region."

How much drenching rain versus dry thunderstorms that occur in the Northwest and the Southwest during the pattern adjustment is uncertain this far out.
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