Look at that large swath of hurricane force wind gusts off the Oregon coast late Saturday morning (all the blues, tans, and whites - white is >80 mph!). Then this storm moves up to batter Portland around dinner and Seattle area in the evening and night. Batten down the hatches!
Looks like Matthew is undergoing an eyewall replacement cycle (ERC). In an ERC, an outer eyewall begins to form around the inner eye and gradually cuts it off. This is a natural process in strong hurricanes.
There is good and bad in the ERC. The good is, it tends to weaken the maximum winds (in the intense inner eye), but the bad is that it spreads the winds out over a larger area (bigger eye).
Hermine got its act together just in time to become a hurricane before landfall in Florida. Visible satellite is pretty impressive, but the radar shows that it doesn't have a consolidated inner core, yet.
Even though it's a minimal hurricane, it will still be a dangerous beast. If you live in the area, check out the NHC (http://www.nhc.noaa.gov/) for official warnings, advisories, and guidance.