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.