Ok I brewed a belgian white ale about two weeks ago when the weather was warmer and pitched the yeast at about 70 and the first two days of fermentation looked good. Then the weather changed. Nothing but cold and rain for the last two weeks. Well I wrapped my fermentor in some blnakets thinking this might keep the brew warm enough but I dont think it did. Temp on the ale pail was sitting between 58 and 60 probbly this whole time. Since I hadnt seen any fermentation in the air lock I went to take a sample reading and it was still pretty high wih not much fermentation having occured and there was what Im assuming was yeast colonies on the top. Are my yeast dead or should me heating the fermentor up reactivate the yeast?