Warm end to March, cold start to April?

It looks like March will be ending like a lamb....However,April looks like it will start like a Lion as warmth will dominate this week before yet another semi- wintry pattern hits the east coast for the first week of April. The warm day this week appears to be Wednesday as we hit between 75-80 but with a Greenland block possibly setting up, it appears now that the first week of April will feel like the first week of March. Full update on Monday