WEATHER UPDATE: Snow, Ice Set to Cause a Monday Mess

UPDATE: Latest Long Island Snowfall Totals

Snowfall projections for a Sunday night and Monday winter storm have declined for Long Island, but enough white stuff and rain is still expected to fall to cause treacherous conditions on the roadways.

A winter storm warning is now in effect for northern Nassau and northwest Suffolk County until 6 p.m. Monday. The rest of the island is under a winter storm advisory until 6 p.m. Monday.

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Northern Nassau/northwest Suffolk

Snow accumulations of 2 to 5 inches, with one or two tenths of an inch of ice is expected for areas under the winter storm warning, according to the National Weather Service. Heavy snow may fall at a rate of 1-2 inches per hour late Sunday night into Monday morning.

The snow will change to heavy rain and freezing rain Monday morning and then back to a wintry mix in the afternoon, the NWS says. The snowfall range could be 1 to 2 inches higher or lower based on the timing of the changeover to rain in the morning.

Southern Long Island/North Fork

Snow accumulations of 1 to 4 inches along with a few hundredths of an inch of ice. The lowest snow totals are likely on the South Fork. Brief heavy snow late Sunday night into early Monday morning will change to heavy rain and then back to a wintry mix in the late afternoon.

The snowfall range could be an inch higher or lower based on the timing of the changeover to rain in the morning. Heavy rain and snow-clogged storm drains could cause some flooding, the NWS says.

The Roads

The roads are expected to be in poor shape for both the morning and afternoon commutes.

Temperatures will fall rapidly on Monday afternoon to the mid and upper 20s and then continue to fall into the teens by midnight.

“This will likely result in a flash freeze of standing water and slush,” the NWS said of the temperature plunge. ”This could make the afternoon commute just as treacherous as the morning commute.”

Wind

The strongest winds will be along the coast.

• E 15-20 gusts to 25 mph Sunday night/early Monday morning
• N 10-20 gusts to 25 mph Monday afternoon
• NW 20-30 gusts to 35-40 mph Monday night

Wind chill temperatures will drop to 5 to 15 degrees below zero on Monday night.

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