Severe Weather Threat Sep 4-8

24 Hours Ago...The 01/00z Ecmwf And Gfs Were Similar Concerning The Timing Of The Inland Acceleration Of The Significant Closed Low...To Become Cut-Off From The Stronger Westerlies Off The Pacific Northwest Coast.

Both Continue To Suggest That This May Occur As Early As Thursday /Day 5/...But Later In The Day...And With A Slower Eastward Progression Along The Canadian/U.S. Border...Across The Northern Rockies...Late This Coming Week Into Next Weekend.

Meanwhile...The Spread Within Their Respective Ensemble Data Remains Quite Large. While It Still Does Not Appear Out Of The Question That A Relatively Substantive Risk For Severe Storms Could Develop Across Parts Of Northeast Oregon And Eastern Washington Into The Mountains Of Western Montana...Probabilities Appear Too Low/Uncertainties Remain Too Large To Delineate A Regional Severe Risk Area. Current Indications Are That Any Severe Weather Potential With This System East Of The Northern Rockies Into The Plains Later In The Period Will Remain Fairly Low.

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