It looks like 562, also PHL-SFO A320, stopped yesterday in Omaha, and today took 35 minutes longer than recent flights. UA1750 yesterday, a 737-900, took 30-45 minutes longer than recent flights.
I don't know if old data is found anywhere, but
tomorrow's jet stream forecast shows 160mph nearly due east. Flights that didn't stop over the last 2 days have been routed abnormally far north.
I don't think a needed refueling is implausible.
EDIT:
WU's time-lapse shows 180-220mph Sunday.
EDIT2: You can find anything with Google...
Build your own jet stream analysis