The cold temperatures will continue throughout the weekend and next week, the weather service says.
A weather service statement Wednesday showed there was still significant snow pack across many areas of Western New York, including almost 2 feet near Springville.
High temperatures will be rise Monday into the 30s, with lows in the teens.
A flash freeze occurs when there's a rapid drop in temperature, causing a quick freeze of water already on the ground such as from rain or melted snow. Chance of precipitation is 50 percent.
The timing of the snowfall may affect road conditions Sunday and Monday morning activities and commutes as roads become slick, according to the weather service.
The National Weather Service in Valley, Nebraska, calls for increasing cloud cover in Pottawattamie County and a high of around 14 today. Chance of precipitation is 70 percent, with new snow accumulation of possibly 1 to 3 inches.
But, forecasters said, "There may be impacts with the upcoming winter weather, beginning Thursday afternoon into Friday".
Not only do we have a flood watch, we also have winter storm warnings in effect for northern New England due to the rapid change from rain to freezing rain and snow tonight.
Saturday Night: Mostly clear, with a low around 20. South wind 10 to 17 miles per hour becoming northwest in the afternoon.
Blowing snow is possible Friday night as winds increase. "The rain is going to be [Friday]".
During the day it will feel between 15 and 25 degrees with the 15-mph winds, while at night, with a low around 10 degrees expected, the wind will make it feel as cold as 5 below zero.
DE is expected to be partly sunny with highs in the high 20s Monday. High near 44. North wind 9 to 14 miles per hour.