This morning lows were just mild enough (mid-upper 30s) to preclude some frost forming on vegetation across SE PA and Central-South NJ last night. Scattered high-level cirrus clouds may have kept temps up just a bit to keep temps at those levels. A weak system is approaching the area for tonight and that will bring some occasional light rain showers until tomorrow morning. Then we have a pattern shift with a deep trough moving into Western US. This forces a ridge to build into the East and temps are going to rise. 70s and maybe even a few 80s are going to become common for highs starting tomorrow. The weekend is looking fantastic with sunshine and warm Fall temps. Enjoy.
500mb Upper-Air Map for 10-10-08 (8 AM)
