Long Island Weather: Powerful Storms to Impact Monday Commute

A storm system that has killed at least seven people across the country has the potential to cause problems for the Monday morning commute on Long Island.

Tornado watches were in effect in several states Sunday night, but the worst of the weather is expected to remain west of the island.

"As a cold front moves through, the potential for damaging winds will be possible, in addition to heavy rainfall and localized urban and poor drainage flooding," the National Weather Service says. "Expect a slow Monday morning commute as the front moves through the region."

Minor urban and poor drainage flooding is the main threat for Long Island.

"You can figure the roughest weather with downpours and possible thunderstorms will be from about 3am to 9am Monday morning from west to east as the line of thunderstorms moves through," Joe Cioffi, a meteorologist for WPIX-TV and FiOS1 News, says on his website.

A dense fog advisory is also in effect for the entire island, except for northern Nassau County, until 6 a.m. Monday. Limited visibilities of a quarter mile or less at times will make travel very difficult, the NWS says.

The full forecast:

Sunday Night- A chance of showers, then showers and possibly a thunderstorm after 2am. Some of the storms could produce heavy rainfall. Areas of fog. Low around 55. Breezy, with a south wind 14 to 22 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

Monday- Showers and possibly a thunderstorm before 8am, then a chance of showers and thunderstorms between 8am and 11am. Some of the storms could produce heavy rainfall. Temperature rising to near 62 by noon, then falling to around 55 during the remainder of the day. Windy, with a west wind 16 to 21 mph increasing to 23 to 28 mph in the afternoon. Winds could gust as high as 38 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Monday Night- Partly cloudy, with a low around 40. Windy, with a northwest wind 21 to 29 mph, with gusts as high as 41 mph.

Tuesday- Sunny, with a high near 60. West wind 16 to 18 mph, with gusts as high as 30 mph.

Tuesday Night- A 20 percent chance of rain. Partly cloudy, with a low around 45. West wind 5 to 9 mph becoming calm after midnight.

Wednesday- Partly sunny, with a high near 58.

Wednesday Night- Mostly cloudy, with a low around 46.

Thursday- A 30 percent chance of rain. Mostly cloudy, with a high near 57.

Thursday Night- A 30 percent chance of rain. Mostly cloudy, with a low around 51.

Friday- A 50 percent chance of showers. Mostly cloudy, with a high near 62. Breezy.