A cold front moved through the city early this morning, clearing out the humidity and giving us bright blue skies. We should see afternoon highs in the mid 80s. We may also see a few clouds later in the day as a mid-level disturbance rides over the surface high pressure system.
The same scenario, a disturbance passing over the surface high, is making tomorrow's forecast very vexing. A high pressure system is sinking air, which brings clear skies. An upper-level shortwave pulls air upward, which will results in clouds and rain. The mystery with tomorrow's forecast is that it's not clear whether the upward pulling will be greater than the downward pushing. The National Weather Service and Weather Channel are both giving a not very confident 40% chance of showers and thunderstorms for Saturday afternoon. That doesn't tell the whole story as the chance of rain will be greater over the city and New Jersey than on eastern Long Island. The forecasters do agree that tomorrow's high will be in the upper 70s to near 80.
A cold front passage late Saturday night has all the forecasters in agreement that Sunday should be very nice. Look for mostly sunny skies and a high in the lower 80s. The mild and dry weather is expected to last through Monday.