Of the three summer holidays it is the Memorial Day holiday weekend that usually creates the most issues especially for Long Island. The cold ocean and the persistent onshore flow that shows up for much of the time in the spring still hasn't run its course. We are setting up for that today with low pressure developing just to our south and an upper air trough moving overhead. This has certainly put us in lots of clouds today. Now we have to deal with rain and some heavier downpours that surround us on the radar today.
SATELLITE
A weak upper low that has moved out of the Tennessee Valley is now over New Jersey and it is producing some downpours and thunderstorms that are showing up on the radar. Not everyone will get into the heavier downpours or the isolated thunderstorms that are in the mix but it seems that everyone will see something at some point today. Temperatures are just into the 60s and will likely hold there into this afternoon.
The next issue is for Sunday. Low pressure will be off the south shore. High pressure will be near Nova Scotia and that means an east northeast flow develops tonight and lasts into Sunday night. It keeps things overcast and then it will turn rather raw. Overnight temperatures will drop into the 40s. Sunday will Cloudy raw and breezy especially along the coast. Temperatures will be hard pressed to get out of the 50s.
Some hope lies for Monday as the onshore flow breaks down and clouds should give way to some breaks of sunshine by afternoon (fingers crossed). Highs should reach the 60s in most places. If we get enough sun 70 is doable. Beginning Tuesday a warm weather pattern sets up in the Eastern US which means no rain until late Friday, sunshine each day, and temperatures in the 70s away from the ocean. We might even see some low 80s in Northern Nassau and Northwest Suffolk County beginning on Wednesday if the wind direction is not too unfavorable.
Please note that with regards to any tropical storms or hurricanes, should a storm be threatening, please consult your local National Weather Service office or your local government officials about what action you should be taking to protect life and property.
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Posted from my blog with SteemPress : https://www.weatherlongisland.com/long-island-surrounded-by-downpours-today-onshore-flow-sunday/