A slow and weak upper level pattern will result in a fairly stagnant weather pattern across the lower 48 states through the weekend.
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A couple upper level troughs will impact the West and Southeast during the period, which will change up the pattern slightly.
The first upper trough will move very slowly across the West over the next few days.
This feature will be fairly weak, but will produce shower and thunderstorm chances each day for much of the Great Basin and northern Rockies.
Locally heavy rainfall will be possible with slow-moving storms, and isolated to scattered instances of flash flooding will be possible.
Shower and thunderstorm chances will also prevail each day over parts of the High Plains due to persistent troughing and enhanced convergence in this region.
Locally heavy rainfall may lead to isolated to scattered instances of flash flooding.
Isolated to scattered severe thunderstorms will also be possible, and the Storm Prediction Center has a Marginal Risk of Severe Thunderstorms (level 1/5) over the entire region for Friday and Saturday with smaller embedded Slight Risk areas (level 2/5) for Friday.
The second upper trough will bring a surface low towards the Southeast coast over the weekend.
This feature will approach the coast very slowly, resulting in a prolonged period of less than ideal holiday weekend conditions.
Shower and thunderstorm chances will increase along the coast and over Florida on Friday, then shift north into the Carolinas and southern Mid-Atlantic Saturday into Sunday.
The heaviest rain is expected in the Carolinas over the weekend, and scattered instances of flash flooding will be possible.
Beach conditions along the Southeastern coast will be hazardous through the weekend with gusty winds and frequent rip currents possible.
Temperatures will trend above average for the majority of the Northwest and North-Central U.S. with highs in the 70s and 80s.
Above average temperatures will expand into the Northeast Saturday and Sunday as a warm front lifts north of the region, and highs will reach into the 80s by Sunday.
Forecast cloud cover and precipitation will result in below normal temperatures in the Southeast and southern Mid-Atlantic region through the weekend with highs only reaching the 60s and lower 70s. ■