Yep, sudden explosion is a good descriptor. My lilac buds started to open slightly especially with the upper 70s last week for a day. I'm sure the chillier weather the next few days will stunt it slightly but 6-10/8-14 day outlooks by NOAA all feature AN temps -- no slowing spring down!
Also notice my eyes itching/tearing the last few days. Allergy szn.