Kurt Bresswein | For lehighvalleylive.comA cold front arriving Tuesday night will usher in autumn air to the Lehigh Valley, bringing cooler temperatures and breezy northeast winds. The cold front moving through will bring a dramatic shift in the weather pattern, according to the National Weather Service forecast. Overnight low temperatures will dip into the mid to upper 40s in the Poconos and northern areas, with the Lehigh Valley experiencing lows in the upper 40s to low 50s. National Weather ServiceAfter clouds gradually clear Tuesday, Wednesday will feature mostly sunny skies with a persistent northeast breeze. Follow your local forecast from AccuWeather at lehighvalleylive.com/weather with National Weather Service watches, warnings and other advisories available as they’re issued at lehighvalleylive.com/weather-alerts.