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The lake-effect snow machine cranked up again Sunday evening and socked areas south and east of metro Buffalo, adding as much as half a foot or more on top of the foot or two that was already there.

Snow, sometimes accompanied by thunder, fell at the rate of 2 to 3 inches per hour. A National Weather Service spotter reported that 11.5 inches fell in 3½ hours in Wales Center. A spotter in East Aurora said that 9.5 inches fell there in three hours. Other reports indicated 6 inches fell in three hours in Lake View and Blasdell.

The storm was heaviest around nightfall in a 15-mile-wide band along Route 20A from Hamburg to Geneseo, then started moving quickly south to the Boston Hills and northern Chautauqua and Cattaraugus counties before tapering off.

Highways were slippery and snow-covered and wind gusts up to 30 mph caused whiteouts. Traffic moved at half the speed limit on Route 219 and the Aurora Expressway and parts of the Thruway between Lackawanna and Silver Creek.

The slippery road conditions kept police in Southtowns communities extra busy with minor vehicle mishaps.

Police in towns including Evans, Hamburg and Orchard Park reported dozens of cars sliding off roadways and requiring police assistance, beginning about midafternoon Sunday, though no injuries were reported.

East Aurora dispatchers said they dealt with 10 to 15 cars in ditches, beginning around 3 p.m.

A lake-effect snow advisory was extended to 4 p.m. today for the traditional snow belt areas in southern Erie, Wyoming, Chautauqua and Cattaraugus counties, with another 1 to 3 inches expected after daybreak, bringing totals for this latest snowfall to a foot or more.

The lake-effect machine had taken a day off during the storm Saturday and early Sunday that blanketed areas that had escaped squalls last week.

Northern Erie and Niagara counties measured 7 to 8 inches of snow.

Officially, 6.3 inches fell at Buffalo Niagara International Airport in Cheektowaga.

Another inch or two of snow is expected to be added to those totals today and tonight and more lake-effect is likely Tuesday and Wednesday.

When will it all end? Warmer temperatures are due Thursday and Friday, with highs in the upper 30s and low 40s. If there is snow then, forecasters say that it’s likely to be mixed with rain.

News Staff Reporter Sandra Tan contributed to this report. email: danderson@buffnews.com