Currently, at 500 hPa a longwave trough sits over much of the eastern United States. This trough is associated with a weak surface low centered over Chicago. The surface low will move east into the mid-Atlantic with a Canadian high to its north, the latter of which will bring the overnight low down to near freezing for Stony Brook. Some light mixed precipitation will then be possible early Sunday morning ahead of the low’s warm front, which after passing will bring a high of around 41. Ridging will then build in the area at 500 hPa starting Sunday but troughing in eastern Canada will bring additional frontal systems to the area in the near future.

Currently, at 500 hPa a longwave ridge is leaving the East Coast of the United States ahead of a longwave trough that sits over much of the central US. This trough is associated with a weak surface low centered south of New England, which is bringing rain to Stony Brook at this time. Rain will continue tonight as the trough continues to deepen and move into the East Coast, as another surface low associated with the trough center undergoes cyclogenesis in the southeast US and moves up the coast towards the Mid-Atlantic. About an inch of rain and weak northwesterly flow is expected overnight with a low of 38. The surface low will pass through the New York City metropolitan area tomorrow morning, with rain ceasing in the afternoon.

Currently, at 500 hPa a shortwave trough sits over much of the East Coast of the United States. A weak surface low over New England associated with the trough may bring some light rain and snow to the area with weak northwest winds tonight, as lows drop to around 35F. Cloudy skies will remain tomorrow as weak westerly flow brings a seasonable high of around 40F. More precipitation is possible tomorrow night from another weak system as lows fall to around 38F. After this, a longwave ridge at 500 hPa will move into the area from the Southeast US and its associated surface high pressure will bring sunny skies and unseasonably high temperatures to Stony Brook for Monday.

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