A pattern of hit-and-miss rain, including the occasional thunderstorm, is in store for Long Island into Saturday, the National Weather Service said.
Tim Morrin, a meteorologist with the Upton office, said the on-and-off-again rain pattern should continue through Saturday night but clear by Sunday, Mother's Day.
"We have waves of precipitation moving northwest to southeast," Morrin said Friday, "with some embedded thunderstorms.
"These waves keep coming in and out, in and out, throughout the day and into most of Saturday."
Clearing is expected for Mother's Day, Morrin said, when a warm front lifts eastward.
Sunday's high is expected to be near 75, with northwest winds reaching up to 10 mph.
Until then, expect showers and some thunderstorms with lightning, Morrin said. Fog, which hovered through the late morning Friday, also should return Friday night and linger overnight into Saturday morning.
"There's not much of a break until Sunday," he said.
Friday's high is expected to be near 60, with mild winds from the southeast at 5 to 11 mph.
Chance of precipitation during the daytime hours is 80 percent, with new rainfall amounts of less than one-tenth of an inch.
The exception to the rainfall totals is areas hit by possible thunderstorms, the service said.
Morrin said rain should end for most of Long Island early Sunday morning, between daybreak and 8 a.m.