Today’s sunny day is predicted to be followed, perhaps just before or during the time we are traveling to rehearsal, with a brief period of INTENSE but brief snow squalls. If you are driving and it starts to snow around that time, PULL OVER and wait it out. No problem if that makes you late to rehearsal. Better to be safe. These squalls, as are typical for such in New England, are likely to last only 10 to 15 min. Then it will be clear and very cold.
BUT, please use your own good judgment about traveling out tonight. Weather conditions in these situations will vary very minutely by location.