Weather links for Swarthmore:

The Clear Sky Clock graphic above uses models from Environment Canada.
Here is the cloud forecast for tonight.
Click the "Play" button to run the animation.
The number with a "Z" in the header of each frame is the UTC, e.g. "22Z" means 22:00 UTC, which is 18:00 EDT / 17:00 EST.

Cloud models for the next twelve hours from UCAR.
(Times are in Universal time [essentially GMT] so to get our local time, subtract 5 hours during standard time, 4 hours during daylight savings time.)

National Weather Service forecast:

• Detailed graphical forecast map, including cloud cover. Find the "Sky Cover" row on the left-hand column, and position your mouse over a particular time to see the map.
• Text
• Hourly sky coverage percentage, next 48 hours.

Animated Doppler radar.

Satellite IR loop for BWI (or this non-java version).

Satellite visible loop for BWI (or non-java version).

Latest visible image.

Latest infrared image.

Radar from Mt. Holly, NJ.

Phillywx.com, comprehensive local weather commentary (especially good for focused forecasts of winter storms with more local nuance).