https://youtu.be/IIeYO8XSerg

Currently, at 500 hPa there is a shortwave trough from Quebec centered over the mid-Atlantic United States followed by a longwave ridge over much of the western two-thirds of the US. The trough is associated with a frontal system centered over New England, which was responsible for today’s rain over Stony Brook before its cold front passed through. The ridge is associated with a surface high over the Southeast. Tonight the frontal system will continue to move northeast away from Long Island in favor of high pressure. This will result in clearing skies and northerly flow with a low temperature of around 49F for Stony Brook. Tomorrow will be a sunny day with northwesterly winds as a result of the high pressure, with the high temperature getting up to around 67F. These conditions will be relatively short-lived as another shortwave trough forms at 500 hPa over the Great Lakes, resulting in a new frontal system that will bring a return to rain on Sunday.

At 500 hPa, the trough over the southeast United States has deepened while the weak ridging over New England is starting to move out of the region. The trough’s associated low pressure system is located over the Ohio Valley and will move into the Northeast, bringing about 0.1 inches of rain to Stony Brook starting late overnight. Winds will be from the southeast and the low temperature will be about 46F. Rain will continue throughout Sunday as the trough moves in and the surface low passes just south of Long Island. An additional half-inch of rain will fall over Stony Brook, with southeast winds increasing and a high temperature of around 52F. Rain will then continue overnight into Tuesday when the trough and low move out to sea.

Currently, at 500 hPa there is a longwave trough centered over Quebec and extending down into much of the eastern United States. This trough is associated with a frontal system that has passed offshore of the Eastern Seaboard. At Stony Brook, cloud cover will decrease tonight and wind flow will be from the west with a low temperature of around 45F. Tomorrow the 500 hPa trough will deepen in the Southeast, resulting in weak ridging and surface high pressure moving into Long Island during the day. This will result in mostly sunny skies and weak northwesterly flow at Stony Brook with a high temperature of around 57F. Tomorrow night the deepened trough will bring a strong surface low into the area, resulting in rain moving back in overnight.

Currently, at 500 hPa there is a longwave trough centered over Hudson Bay and extending down into much of the continental United States. This trough is associated with surface low pressure over Quebec, with a cold front extending down to the Northeast. The cold front will begin approaching Stony Brook tonight, which will see mostly cloudy skies and southwest flow. The low temperature will be around 48F. The cold front will pass through Long Island early in the morning, which will bring light rain before clearing later. Stony Brook will see about 0.4 inches of rain and a high temperature of around 49F.

Currently, at 500 hPa the longwave trough previously over Nova Scotia had moved northeast over Labrador while weak ridging sits over the southeast United States ahead of another longwave trough forming over the western US. The ridging is associated with surface high pressure over the eastern US which has been responsible for today’s calm weather over Stony Brook. This weather pattern will continue tonight as the high pressure moves offshore, resulting in westerly flow and clear skies with a low temperature of around 42F. Tomorrow the western trough will deepen and move into Great Plains while the ridge strengthens into the Northeast, with the former spurning the development of a strong frontal system at the surface over the south-central US. As a result cloud cover will increase during the day Sunday and flow will become more southerly, bringing the high temperature to around 55F for Stony Brook. Rain will then move in on Sunday night as the frontal system pushes into the Great Lakes.

Currently, at 500 hPa there is a longwave trough centered over Nova Scotia covering most of the northeastern United States, followed by weak ridging over the south-central US. The trough is associated with a surface low over Nova Scotia which was responsible for the unsettled weather over Stony Brook earlier today, while the ridge is associated with surface high pressure over the southeast US. Tonight, the strong northwesterly flow will drive the low temperature for Stony Brook down to around 38F with clouds diminishing through the night. The 500 hPa trough and surface low over Nova Scotia will continue to move to the northeast tomorrow, allowing the southeast high pressure to bring sunny skies and a high temperature of around 50F to Stony Brook, with northwesterly flow weakening. Calm weather will continue into Sunday before another 500 hPa longwave trough forms over the central US and returns rain to the northeast Sunday night.

Currently, at 500 hPa there is a longwave ridge centered over northern Canada extending south into the northeastern United States followed by a longwave trough centered off the coast of the Pacific Northwest extending east into central Canada. The ridge is associated with weak surface high pressure over the East Coast, while the trough is associated with a surface low over Quebec with a cold front extending down to the Gulf of Mexico. The high pressure will remain over Stony Brook tonight, resulting in mostly cloudy skies and weak southerly flow with a low temperature of around 45F. This weather pattern will continue into Sunday as the cold front approaches Long Island; the high temperature will reach around 49F. The cold front will bring rain to Stony Brook Sunday night, as the 500 hPa trough moves into Quebec and cuts off the ridging over the Eastern US from its center over Canada, before clearing by Monday morning after the front passes through.

Currently, at 500 hPa a longwave trough sits off the East Coast of the United States ahead of longwave ridging over eastern Canada into the Midwest US. The trough is associated with a surface low east of New England which is responsible for the wet and cloudy conditions over Stony Brook today, while the ridge is associated with surface high pressure further inland. Tonight, the 500 hPa ridge will deepen and force the trough further south, resulting in a warm front pushing south into New England. This will bring about 0.1 inches of rain to Stony Brook tonight and strong northerly flow, with a low temperature of around 45F. This weather pattern will continue on Friday with the warm front ultimately passing through Stony Brook early Friday evening. An additional 0.2 inches of rain will fall during the day on Friday; northerly flow will continue and the temperature will remain relatively steady with the high only reaching around 47F.

Currently, at 500 hPa there is a longwave ridge over much of the eastern United States followed by a shortwave trough over the Great Plains. The ridge is associated with high pressure offshore while the trough is associated with a frontal system centered over Kansas with a long warm front extending east across the US and south of Long Island. Strong frontogenesis is occurring along this front, which will bring some light rain today to Stony Brook. This weather pattern will continue tonight and temperatures will remain relatively steady in Stony Brook with a low of around 45F and southeasterly flow. Rain will become more heavy overnight with a precipitation amount of around 0.4 inches. On Sunday the 500 hPa trough will move into the Great Lakes and rain will become lighter over Stony Brook as the warm front approaches but remains just south of Long Island. The high temperature will reach around 50F and an additional 0.1 inches of rain will fall, with southeasterly flow continuing.