Severe Weather Threat Sep 17-21

00z Deterministic/Ensemble Guidance Generally Suggest That A
Progressive Belt Of Westerlies Will Remain Over The Northern Half Of
The Conus Into Canada Through The Middle Part Of The Week...With A More Amplified/Stagnant Pattern Potentially Evolving Thereafter.

Initially...Little Severe Potential Is Expected Through Day 4/Tuesday.

Low-Level Moisture Will Otherwise Gradually Spread Northeastward Into Much Of The Middle/Upper Ms River Valley And Midwest Ahead Of An Amplifying Upper Trough/Southeast-Moving Cold Front.

Although The Predictability/Expected Magnitude Do Not Warrant 30 Percent Equivalent Risk Areas...Current Indications Are That At Least Some Severe Tstms May Be Possible On Day 5/Wednesday Across
Portions Of The Dakotas/Upper Midwest.

As The Front Continues Southeastward On Day 6/Thursday...A Similar Severe Risk Could Then Potentially Spread Into Additional Parts Of The Midwest/Great Lakes/Middle Ms River Valley.

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