12z runs of the Euro, GFS, and GGEM all have the back door scenario to one level or another. Differences are in how far the front progresses. We may just be a bit cooler over the weekend because the front is nearby and brings in cloud cover. All 3 plus GEFS and GEPS bring in the real cold front sometime Tuesday next week that cools us down to at least seasonable temps and probably more like low 80s.