I noticed this morning at around 6, that it was perfectly clear in my area (seeing stars), but the NWS obs were overcast. There's almost no way it was completely overcast at the airport, but 15 miles away was clear.
It's something I've noticed with them a lot. Happens a lot in the summer too, especially when making a run at 90, lol. It will be pretty clear or partly cloudy in town, but mostly cloudy or overcast at the airport. Just weird.