Weather and Climate Links

Observations
NCAR RAL Real-Time Weather
NWS OPC Unified Surface Analysis
NWS WPC Surface Analyses and QPF maps
NOAA View Data Imagery Portal
SUNY Albany Surface Theta and q
University of Wyoming Constant Pressure Surface Maps & Archive
NOAA SPC Surface & Upper Air Map Archive
SPC Hourly Mesoanalysis Archive
Colorado State DIFAX chart archive
Iowa State GEMPAK archive data and plots
NOAA/NCDC Analysis and Forecast Archive
NCAR/MMM Case Selection Data Archive
NCDC Climate Data Online
U.S. City Climate Comparison Graph maker
NCDC Local Climate Summaries
NWS Precipitation Analysis
OU CIMMS FLASH (Flooded Locations and Simulated Hydrographs)
National Mosaic & Multi-sensor QPE
NWS Precipitable Water Plots and Climatology
CIMMS Integrated Total Precipitable Water
University of Wisconsin SSEC Sea Surface Temperatures
CPC Monthly Ocean Briefing
CPC Historical ENSO anomalies
CPC Ocean NINO Index (ONI)
SPC Sounding Archive
University of Wyoming Sounding Page
Iowa Mesonet
Oklahoma Mesonet
The University of Utah Mesowest
Naval Postgraduate School West Coast Wind Profilers
Plymouth State METAR Archive
NWS 3-day Weather Observations

Radar and Satellite
NCDC archived radar
University of Washington Satellite Imagery
NASA GHCC
Naval Research Lab (NRL) Satellite Products
NOAA NESDIS CIRA Tropical RAMSDIS Online
NOAA NESDIS GIBBS Satellite Archive
NRL/NPOESS NexSat
NASA CloudSat
CLAUS Data Archive
SSEC @ University of Wisconsin-Madison MODIS Archive
University of Arizona satellite imagery
University of Arizona radar imagery
National Snow and Ice Data Center
Arctic Sea Ice Graphs

Models
Heather Archambault's GFS Analyses and Archive
Alicia Bentley's Real-time GFS Analyses and Forecast Maps
Tomer Burg's GFS Analyses and Forecast Maps
Tropical Tidbits Forecast Models
Kyle Griffin's GFS Forecasting Maps
Penn State e-Wall
TwisterData
Real-time Quasi-Geostrophic Diagnostics
Real-Time Diagnosis of GFS Forecasts for last 60 days
NCAR Ensemble Forecasts
Rapid Refresh & HRRR
NCEP 4.0 km WRF-NMM runs
NSSL Real-time 4 km WRF
CSU 4km WRF
University of Arizona 1.8 km WRF (Arizona region)
University of Arizona 1.8 km WRF (Idaho region)
NCEP SREF Plume Viewer
EMC GEFS plumes
NCEP models
NWS Raleigh High Resolution NWP Reflectivity Comparison
Current MOS Forecast Products
NCEP Model Output Hourly Time Series
NOAA/ESRL High resolution Precipitation Forecasts
NMC/EMC Model Output Archive
University of Utah Weather Center
University of Washington Regional Numerical Weather Prediction for the Western U.S.
NCEP/WPC Standardized Anomalies
Environment Canada Cloud Model
NOAA/ESRL/PSD Interactive Plotting and Analysis
HYSPLIT Trajectory Model

Hurricanes and Tropical Meteorology
National Hurricane Center
NRL Tropical Cyclones
RAP Tropical Cyclone Guidance Project
Unisys Tropical Cyclone tracks
HRD reconn data archive
Live Atlantic basin reconnaissance
Radar Loops of Landfalling TCs
OceanWeather Inc.
Tropical Tidbits
Knapp/Kossin TC Satellite Reanalysis
CIRA Tropical Cyclones
CIRA Tropical Cyclone Formation Probability Guidance
CIMMS Tropical Cyclones
Kerry Emanuel's Hurricane Potential Intensity Maps
ECMWF Ensemble Tropical Cyclone Guidance
Brian Tang's Tropical Cyclone Guidance
Tropical Cyclone Track Probability
Meteocentre Multi-model Tropical Cyclone Automated Tracking
NCEP Hurricane WRF
Experimental Tropical Cyclone Genesis Potential Fields
NOAA HFIP Experimental Real-time High-resolution TC Forecasts
GFDL Hurricane Model Ensemble Forecasts
Paul Roundy's Monitoring and Prediction of Tropical Convection
Mike Ventrice's MJO, Monsoon and Tropical Wave Monitoring
Carl Schrek's Plots of Precipitation and 850 hPa winds
North Carolina State-CICS-NC Monitoring of the MJO and Tropical Waves
TIGGE MJO forecasts 
2004-08 North Atlantic TC Synoptic Charts

Severe Weather
Storm Prediction Center
NOAA Aviation Weather Center
SPC Severe Weather Climatology
NOAA/OPC Experimental Lightning Strike Density

K-12 Educational Resources and Outreach
Monsoon safety awareness 
NWS Tucson, AZ 
National Hurricane Center 
Storm Prediction Center 
Steven Moore's Storm and Emergency Guide for kids 

Other links
University at Albany map discussion archive
Kristen Corbosiero's weather links (source of many of the above links)