Mostly dry start on Monday across Long Island before late-day scattered showers
Quiet weather continues through Monday before a slow-moving storm system brings periods of heavy rain, thunderstorms and localized flooding concerns from Tuesday into Thursday.
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What to expect:
Pleasant, dry weather continues through Monday, with comfortable humidity.
Showers begin to develop Monday night.
Periods of rain and thunderstorms are likely Tuesday through Wednesday, with locally heavy rainfall possible.
A few thunderstorms could become strong Tuesday if enough sunshine develops, but confidence remains low.
Rain chances gradually diminish Thursday before sunshine returns Friday.
FORECAST
Overnight (Temperatures: Low to mid-60s)
Mostly clear and comfortable, with light winds and low humidity.
Monday (Temperatures: Low 80s)
Another pleasant summer day, with sunshine giving way to increasing afternoon clouds. Most locations stay dry, although an isolated shower can't be ruled out late in the day.
Monday Night (Temperatures: Upper 60s)
Clouds increase, with showers developing after midnight as the next weather system approaches. Rainfall will generally be light overnight.
Tuesday (Temperatures: Around 80 to Low 80s)
Periods of showers become more widespread, with thunderstorms developing during the afternoon. Some storms could produce heavy downpours and if enough breaks of sunshine develop, a few stronger storms cannot be ruled out. Localized ponding of water and minor flooding will be possible where heavier rain persists.
Tuesday Night (Temperatures: Mid- to upper 60s)
Widespread showers continue, with embedded thunderstorms. Periods of moderate to heavy rain may lead to localized flooding of poor drainage and low-lying areas.
Wednesday (Temperatures: Around 80 to Low 80s)
Cloudy and unsettled with additional showers likely through much of the day. While thunderstorms remain possible, the primary concern shifts toward periods of rain and locally heavy downpours before conditions gradually improve later in the day.
Thursday (Highs: Upper 70s to Around 80)
A few lingering showers remain possible early, but skies gradually brighten during the afternoon as drier air begins working into the region.
Friday (Temperatures: Low 80s)
Sunny, comfortable and seasonably pleasant, with low humidity.
Weather alerts, watches and hazards
Heavy Rain Potential (Tuesday through Wednesday):
A slow-moving storm system will bring several rounds of showers and thunderstorms capable of producing locally heavy rainfall. The Weather Prediction Center has placed Long Island under a marginal to slight risk for excessive rainfall, meaning isolated instances of flooding are possible, especially in poor drainage and low-lying areas.
Localized Flooding:
The exact placement of the heaviest rain remains uncertain as of Sunday evening's forecast because it depends on the eventual track of developing low pressure. Areas that receive repeated rounds of rain could experience ponding on roads and localized flooding.
Thunderstorm Risk (Tuesday):
A few thunderstorms may become strong Tuesday afternoon if enough instability develops. Confidence in any severe weather remains lower than confidence in the heavy rain threat, but gusty winds and frequent lightning will be possible with stronger storms.
Astronomical Tides:
Tides will continue running higher than normal through the week as the full moon approaches. While widespread coastal flooding is not currently expected, elevated water levels will be monitored in the event heavier rain coincides with high tide.
Improving Late Week:
Rain chances steadily decrease Thursday, with high pressure returning Friday to bring sunshine, comfortable humidity and pleasant late-summer weather.
