Severe Weather Alerts - Hancock, MI Winter Storm Warning Winter Storm Warning in effect from Sunday, 12:00 AM EST until Sunday, 10:00 AM EST. Source: U.S. National Weather Service ...WINTER STORM WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 10 AM EST SUNDAY... * WHAT...Heavy snow expected. Total snow accumulations of 5 to 8 inches are expected. * WHERE...Keweenaw and Northern Houghton Counties. * WHEN...From midnight tonight to 10 AM EST Sunday.