SPC Sep 6, 2017 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook

Day 4-8 Convective Outlook  
NWS Storm Prediction Center Norman OK
0331 AM CDT Wed Sep 06 2017

Valid 091200Z - 141200Z

...DISCUSSION...
Primary feature of interest during the extended period is Hurricane
Irma. Guidance continues to indicate run-to-run and model-to-model
variability, particularly at longer forecast ranges (i.e. days 4 to
7). This forecast uncertainty combined with typical uncertainties
regarding tropical cyclone tornado environments results in low
predictability.

Upper ridging will likely be in place across the central CONUS on
D4/Saturday with some westerly drift possible on D5/Sunday. This
ridge is not expected to be overly strong but it still results in a
general blocking pattern and northward displacement of the stronger
westerlies. As a result, the CONUS will remain void of any strong
shortwave troughs through at least the beginning of next week.

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