i have been huntin mushrooms since i could walk, my old man used to tell me 50deg nights were the key. over the years i have been watching the lilac bushes to tell me when to go. as the bush in the yard had some deep reddish purple blooms starting to poke through it, told me to go look for greys today. i have also noticed that the bigger the blooms the larger the crop. and when the lilac blooms are gone so are the morels. call me crazy, but watch and see what happens. what barometers do the rest of you use?