Currently, at 500 hPa the weather over Stony Brook is being dominated by a shortwave trough just to the south of Long Island, which is followed by longwave ridging centered over Texas. The trough is associated with low pressure offshore currently bringing scattered light rain to the area, which will clear overnight as high pressure associated with the ridge moves into the southeast United States. The low temperature for Stony Brook tonight will be around 38F with northerly flow. The high pressure will allow for sunny skies on Thursday and a more northeasterly flow, with a high temperature of around 47F.

Currently, at 500 hPa there is a longwave trough over Quebec and ridging dominating most of the eastern United States. The trough is associated with a surface frontal system of which Stony Brook is currently in the warm sector ahead of the cold front. The ridge is associated with high pressure at the surface located behind the cold front. Tonight, the trough will continue to move eastward away from the northeast US and the cold front will therefore pass through Stony Brook. Lows tonight in Stony Brook. will drop sharply to around 40F as a result with clear skies, northwesterly flow, and no more precipitation expected. Tomorrow will see clear skies and northwesterly continuing with high pressure moving in, bringing a high of around 51F.

Currently, there is a longwave trough at 500 hPa moving offshore of the eastern United States in place of a longwave ridge centered over the Midwest and covering most of the central US. This will allow for high pressure at the surface to dominate the weather at Stony Brook for the next few days, bringing clear skies during this time. Tonight’s temperatures will drop down to around 32F and winds will be from the north. This trend will continue on Sunday as flow shifts to the west, bringing warmer air to Stony Brook and allowing highs to rise to around 52F.

Currently, most of the eastern United States is dominated by a longwave ridge at 500 hPa ahead of a longwave trough centered over the Midwest. The ridge is associated with surface high pressure centered over the mid-Atlantic while the trough is associated with a frontal system over the Great Lakes. The high pressure that has been driving weather in Stony Brook the last few days will move offshore overnight as the trough deepens and moves east with the frontal system, pushing the high pressure offshore. This will result in clouds increasing and winds becoming more southwesterly in Stony Brook as the low temperature drops to around 40F. On Friday the frontal system will bring about 0.03 inches of rain to Stony Brook starting in the afternoon. The Friday high temperature will be around 47F and winds will shift to being from the southeast.

The longwave trough at 500 hPa is starting to move offshore and over the North Atlantic Ocean. There is a shortwave ridge behind it currently centered over the Great Lakes region which is associated with high pressure at the surface in the Midwest. This will result in clear skies and a more northerly flow for Stony Brook, bringing tonight’s low down to around 25F. High pressure will continue to build into Stony Brook on Sunday as the 500 hPa ridge moves eastward into Ontario, with flow becoming more northwesterly and the high reaching around 37F. This weather pattern will continue until Monday when another longwave trough and frontal system will begin to approach the area.

Currently, at 500 hPa there is a longwave trough over much of the eastern United States, which is associated with weak low pressure at the surface currently centered over New York City. The low will move offshore overnight, which will lead to clouds decreasing and a strong westerly flow over Stony Brook. The low temperature tonight will be around 27F. This weather pattern will continue Saturday as the 500 hPa trough weakens and moves eastward, bringing a high temperature of around 34F to Stony Brook.

There has not been much change in the 500 hPa longwave ridging over the continental United States since the last forecast. As a result, high pressure continues to dominate at the surface in Stony Brook, leading to continuous westerly flow and blue skies for the weekend. The low temperature tonight will be around 36F for Stony Brook, while the high on Sunday will get up to 48F because of the consistent weather pattern.

Currently at 500 hPa, longwave ridging sits over almost the entire continental United States. This is associated with high pressure at the surface continuing through the end of the weekend in Stony Brook, which will maintain clear skies during this time. Winds will become more westerly overnight, resulting in the temperature recovering to around freezing by sunrise on Saturday with a high of around 43F in the afternoon.

Currently, at 500 hPa a longwave ridge sits over much of the eastern United States in association with high pressure off the coast of New England. These will continue to move offshore, bringing southerly flow to Stony Brook and allowing temperatures to continue to climb overnight to around 34F by sunrise on Sunday. This weather pattern will continue through Sunday and bring a high temperature of around 42F in Stony Brook. Throughout this time, skies will be nice in Stony Brook and no precipitation is expected until a longwave trough at 500 hPa approaches the area starting on Tuesday.

Currently, a shortwave trough at 500 hPa along the coast of New England is giving way to a longwave ridge over the Midwest. This will result in a surface high dominating synoptic-scale weather over Stony Brook for the next few days. This high is currently located over western New York, which will lead to strong northerly flow bringing colder temperatures tonight. The morning low for Stony Brook will be around 17F. As the surface high moves east with the 500 hPa ridge on Saturday, the flow will become weaker and temperatures will rise throughout the day to around 32F by midnight Sunday.