There was an AIRMET TANGO for the northeast on Sunday in the flight levels, valid until 1500Z. I wasn't flying until 1800Z, and I don't fly in the flight levels, so I discounted it. Upon reviewing my FFM briefing, however, were a couple nuggets that I missed:
AIRMET TANGO UPDT 1 FOR TURB AND STG SFC WNDS VALID UNTIL 101500
...
MOD TURB BTN FL180 AND FL390. CONDS CONTG BYD 15Z THRU 21Z.
, which would explain why my flight was not as boring as I'd expected.