65 MPH Winds May Knock Out Power; Flash Flood Watch Issued

Heavy rain and winds up to 65 mph will likely lead to power outages and flooding on Long Island Sunday and Monday. The National Weather Service has issued a flash flood watch and a high wind warning for the entire island.

Deepening low pressure along the mid-Atlantic coast Sunday will interact with a tropical feed of moisture, producing heavy rain showers along with embedded thunderstorms, the NWS says. Widespread rainfall amounts of 2 to 3 inches are expected, with localized higher amounts of up to 6 inches.

"While the area has been dry over the last couple of months, recent heavy rains this week and the likelihood of additional significant rainfall has necessitated the issuance of a flash flood watch," a NWS forecast discussion says.

The flash flood watch will be in effect from noon Sunday until 6 a.m. Monday. A high wind warning takes effect at 6 p.m. Sunday and expires at 6 a.m. Monday. Sustained southeast winds of 35-45 mph are likely with gusts up to 65 mph possible.

Widespread power outages are likely as high winds blow down trees and power lines, the NWS says. Travel will be difficult, especially for high profile vehicles.

The full forecast:

Sunday- Showers, with thunderstorms also possible after noon. Some of the storms could produce heavy rainfall. High near 66. Breezy, with a southeast wind 11 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

Sunday Night- Showers and possibly a thunderstorm before 1am, then showers likely. Some of the storms could produce heavy rainfall. Low around 51. Windy, with a southeast wind 26 to 36 mph becoming southwest 10 to 20 mph. Winds could gust as high as 55 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

Monday- Showers likely, mainly before 9am. Cloudy, then gradually becoming mostly sunny, with a high near 60. Windy, with a west wind 23 to 29 mph, with gusts as high as 40 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Monday Night- Mostly clear, with a low around 43. West wind 15 to 17 mph.

Tuesday- Sunny, with a high near 58. West wind around 14 mph.

Tuesday Night- Mostly clear, with a low around 43.