I've been looking at the ARRL bulletins and spaceweather.com for what
the cause is but don't see anything.

The bands at my QTH (mid-Atlantic US) were really really sucky this
past weekend. Just a very few ham signals and the shortwave bands were
nearly empty, even the normal powerhouses were just barely trickling
in. Conditions for MW reception in the evening were awful too.

Local weather has had a long string of rain/thunderstorms that began
about the same time as the bad propogation (Friday night/Saturday
morning).

Tim.