WEEKEND WEATHER FORECAST

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We had the instability showers/snow showers today as forecast yesterday by the RRFS and GFS. Those will be ending with sunset, as cold air streams in from the northwest.

A broad dip in the jet flow will cause cold weather to be with us through the weekend and into much of the next week.

Current satellite water vapor image with superimposed RAP model 500-1000 mb thickness lines (yellow), Mean Sea Level Pressure isobars (black contours) potential vorticity (fine violet contours) with superimposed Composite RADAR. (Click on image for a larger view.)

For Saturday, cold with instability cloudiness again about noon into early afternoon. No showers expected. Sunday continues sunny and cold.

Saturday Forecast

Sunny in the morning, instability cloudiness towards noon into the early afternoon, then skies clear. Windy during the mid-day hours. Temperatures in meteogram below. Wind chills (‘apparent temperatures’ in the meteogram) below 30º

Sunday Forecast

Some warm air aloft from a southwesterly wind will cause some cloudiness during the morning hours, then partly sunny. Still somewhat windy mid-day into early afternoon.

A weak cold front moves through Sunday evening dropping temperatures.

NBM forecast temperatures for Blue Bell, PA (Click on image for a larger view.)
Looking Ahead

A cold front with a possible interaction with some southern jet stream energy will bring some very light showers or showers with some snow flakes later Wednesday. There’s uncertainty with is system.