As of 1200 on Sep 10 forecasted hurricane level winds from both Irma and Jose are impacting the US mainland. Metar wind direction (yellow arrows) show storm surge is likely as far north as the Florida panhandle. First outages are being reported in the Jacksonville area.

Sep 10 Florida Areas under Threat

Probability plots of exposure to greater than 64 kt winds show impacts from Tampa to Tallahassee through the main East-West transmission lines.  This track could outage as many as 9 million customers in Florida, Georgia and Alabama.