Weather Sites for Flight Planning

General

American Weather Concepts (commercial site that has gone down hill fast)
Good surface and upper air maps (University of Michigan)
Automated Weather Observation Site
Aviation Digital Data Service
Geostationary Satellite Server
DUATS on the web
Raw Sounding data
1 km visible satellite images for western US
Weather depiction chart from AWC (nice and big)
Radar Summary chart from AWC (nice and big)
Lifted Index/K Index chart (TIF file, upside down)
NWS Fax Charts

NOAA HPC (great forecast maps)

Surface Analysis
1 and 2 day forecasts
3, 4 and 5 day forecasts
6 and 7 day forecasts

Intellicast Current Conditions

Surface analysis
Intellicast Radar Summary
Intellicast Radar Loop

Intellicast by State

Intellicast Washington
Intellicast Oregon
Intellicast Massachusetts

Weather channel Current Conditions

Weather Channel Current Surface
Weather Channel Airport Conditions (VFR/MVFR)

Weather Channel Weekly Forecast

Morning, Midday, Evening
Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday

Weather Channel City Forecasts

Washington
Seattle
Oregon
La Grande, Pendleton, Eugene, Portland, Medford
Massachusetts
San Jose, San Francisco, Redding, Novato

Misc. Stuff

Very cool current images from OSEI (updated daily)
Weather cams, weather cams and more weather cams