Due to an incompatible change in the geocoding API of Google we are facing difficulties with mapping ZIP-codes to geo-coordinates. A fix was introduced which should be active in the latest Us Weather Radar Gadget.
Some instances might have cached the Weather Radar gadget. Helpful is the following gadget from Google which enables you to control caching behaviour of gadgets:
Please let us know if you still have issues after turning off caching of the gadget. If it is working for you you can turn off caching again.
Update Oct. 20th: The issue with the Google geocoder is still not solved. We did further modifications to the geocoding process using 3 different geocoder now and will track results and issues. For us it is working so we need feedback if you have trouble even after turning off caching.