A cold front moved through late Friday and Saturday will be cold with a high of 32.
A clipper disturbance moves through Sunday and merges with a coastal front bringing heavy rain, especially in NJ. Low pressure spawning from this merger will bring cold air back in later Sunday. Right now, it doesn’t appear that there will be a changeover to snow, but it remains a possibility. High on Sunday about 38.
A cold cyclonic flow and cold surface high pressure will bring well below average temperatures for Saturday. Breezy conditions will make the temperatures seem even colder. It will be sunny but highs will be around 20 on Saturday.
Winds shift to the southwest on Sunday and temperatures are expected to moderate into the mid 30s. Mostly sunny most of the day but with moisture returning with some clouds late in the day on Sunday.
A low pressure system is expected to move to our south on Monday. Precipitation moving in before daybreak will arrive with surface temperatures below freezing, so expect some sleet and icy conditions early Monday. It’s not clear how soon surface temperatures will move above freezing, but travel will be affected early Monday. Stay tuned.
A clipper-type system will move through Tuesday morning, bringing light snow to our area during the morning, ending early afternoon. The models often over-predict the amount of precipitation with theses systems (and very occasionally under-predict coastal development).
Both the GFS and NAM are predicting about 0.12 inches of water, falling as snow. With low temperatures, the ratio may be as high as 1:20, so 1-2 inches appears to be the case here. Again, clippers are notoriously underperforming from a snow point of view, so we will have to see if we really get that much.
Rain continues for much of the morning today. There may be a pause in the rain during the early or mid afternoon. Rain redevelops as the actual cold front moves through about 6-7 PM. The GFS LAMP forecast doesn’t have the high temperature above 59 in PHL.
There continues to be a chance of light snow on Tuesday, maybe 1-2 inches.