Summary Expires: 12/31/2017 4:00 AM ... ...LAKE EFFECT SNOW WARNING IN EFFECT FROM 1 PM FRIDAY TO 4 AMEST SUNDAY...* WHAT...Heavy lake effect snow expected. Travel will be verydifficult at times. Total snow accumulations of 15 to 20 inchesare expected in the most persistent lake snows.* WHERE...Chautauqua, Cattaraugus, and Southern Erie counties. Thegreatest accumulations are expected along the Lake Erie shoreand the Chautauqua Ridge.* WHEN...1 PM Friday to 4 AM Sunday.* ADDITIONAL DETAILS...Heavy lake effect snow will result in verydifficult travel conditions at times with deep snow cover onroads and very low visibility.