A significant winter storm is set to bring heavy snowfall to parts of Upstate New York this weekend. Our Spectrum News 1 Weather Experts discuss which of the counties will be affected the most in this county-by-county breakdown.

Onondaga

Winter Storm Warning (until 7 p.m. Sunday)

Main impact: Saturday afternoon through Sunday evening

Total snowfall: 5 to 9 inches

Snowfall rates up to 1 inch per hour are possible through Saturday evening.

Oneida

Winter Storm Warning (until 7 p.m. Sunday)

Main impact: Saturday afternoon through Sunday evening

Total snowfall: 5 to 9 inches

Snowfall rates up to 1 inch per hour are possible through Saturday evening.

Broome

Winter Storm Warning (until 7 p.m. Sunday)

Main impact: Saturday afternoon through Sunday evening

Total snowfall: 6 to 10 inches

Snowfall rates up to 1 inch per hour are possible through Saturday night.

Winds: Gusts up to 30 mph

Tompkins

Winter Storm Warning (until 7 p.m. Sunday)

Main impact: Saturday afternoon through Sunday evening

Total snowfall: 5 to 9 inches

Snowfall rates up to 1 inch per hour are possible through Saturday evening.

Oswego

Winter Storm Warning (in effect from 7 p.m. Saturday until 7 p.m. Sunday)

Main impact: Saturday night through Sunday evening

Total snowfall: 4 to 8 inches

Jefferson

Winter Storm Warning (in effect from 7 p.m. Saturday until 7 p.m. Sunday)

Main impact: Saturday night through Sunday evening

Total snowfall: 4 to 8 inches

Madison

Winter Storm Warning (until 7 p.m. Sunday)

Main impact: Saturday afternoon through Sunday evening

Total snowfall: 5 to 9 inches

Snowfall rates up to 1 inch per hour are possible through Saturday evening.

Cortland

Winter Storm Warning (until 7 p.m. Sunday)

Main impact: Saturday afternoon through Sunday evening

Total snowfall: 6 to 10 inches

Snowfall rates up to 1 inch per hour are possible through Saturday night.

Winds: Gusts up to 30 mph

Cayuga

Winter Storm Warning (until 7 p.m. Sunday)

Main impact: Saturday afternoon through Sunday evening

Total snowfall: 5 to 9 inches

Snowfall rates up to 1 inch per hour are possible through Saturday evening.

Herkimer

Winter Storm Warning (in effect from 7 p.m. Saturday until 7 p.m. Sunday)

Main impact: Saturday evening through Sunday evening

Total snowfall: 6 to 12 inches possible, with locally higher amounts reaching up to 15 inches

Snowfall rates up to 1 inch per hour are possible Saturday night into Sunday morning.

Chemung

Winter Storm Warning (until 7 p.m. Sunday)

Main impact: Saturday afternoon through Sunday evening

Total snowfall: 5 to 9 inches

Snowfall rates up to 1 inch per hour are possible through Saturday evening.

Steuben

Winter Storm Warning (until 7 p.m. Sunday)

Main impact: Saturday afternoon through Sunday evening

Total snowfall: 5 to 9 inches

Snowfall rates up to 1 inch per hour are possible through Saturday evening.

Lewis

Winter Weather Advisory (in effect from 7 p.m. Saturday until 7 p.m. Sunday)

Main impact: Saturday evening through Sunday evening

Total snowfall: 4 to 8 inches

Delaware

Winter Storm Warning (until 7 p.m. Sunday)

Main impact: Saturday afternoon through Sunday evening

Total snowfall: 6 to 10 inches

Snowfall rates up to 1 inch per hour are possible through Saturday night.

Winds: Gusts up to 30 mph

Chenango

Winter Storm Warning (until 7 p.m. Sunday)

Main impact: Saturday afternoon through Sunday evening

Total snowfall: 6 to 10 inches

Snowfall rates up to 1 inch per hour are possible through Saturday night.

Winds: Gusts up to 30 mph

Otsego

Winter Storm Warning (until 7 p.m. Sunday)

Main impact: Saturday afternoon through Sunday evening

Total snowfall: 6 to 10 inches

Snowfall rates up to 1 inch per hour are possible through Saturday night.

Winds: Gusts up to 30 mph

Our team of meteorologists dives deep into the science of weather and breaks down timely weather data and information. To view more weather and climate stories, check out our weather blogs section.