Snow fell over the weekend on the higher mountain ranges
Recent GFS model runs (up to 00Z on Wed 20th) continue to wobble with respect to the amount of rainfall, but there is no doubt that this will be an intense weather event.
Surface wind speeds are starting to look incredible (along with deep sea swells), with this link predicting winds of 100km/h at the summit of Table Mountain on Fri 22nd! http://www.mountain-forecast.com/peaks/Table-Mountain/forecasts/1087
Edit: One of the (several) factors producing such heavy rain during Fri 22nd, is the inflow of mid-level moisture into the front, driven by strong jet-stream winds. This GFS chart at 12Z shows a long curved stream of moisture, which will interact with upper instability (see 500hPa temperatures mentioned previously), to produce significantly enhanced precipitation. The rain will cease abruptly once the front has passed, and this source of moisture will no longer be over CT.