​Upper air maps

• Current upper air maps, University of Wyoming
• Storm Prediction Center upper air maps
• Northern Hemisphere 500-mb map, Canadian Weather Service
• Northern Hemisphere 500-mb map, wxmaps.org
• Northern Hemisphere 500-mb map, Penn State. (currently not working)

Surface maps

• Current surface chart
• Interactive surface chart
• North American surface chart which includes marine obs
• Link to a suite of land/sea surface charts (The NWS "unified" surface analysis)
• Current TAFB analysis
• Different NOAA surface charts
• Temperature
• Dewpoint
• Theta-E
• COCORAS precipitation observations

Current satellite and radar

• National radar
• GIS radar version (current conditions as well as archives)
• NSSL's Multi-Radar Multi-Sensor (MRMS) product
• Northern Hemisphere Infrared grey scale (Plymouth University)
• Northern Hemisphere infrared
• Northern Hemisphere water vapor
• Northern Hemisphere visible

Vertical motion QG diagnostics from the CMC model, courtesy Thomas Galarneau of CIMSS/NSSL

• Vertical motion associated with vertical change of vorticity advection from 900 to 500 mb
• Vertical motion associated with Laplacian of temperature advection at 700 mb
• Vertical motion combining two terms above from Omega equation
• Vertical motion from Trenberth thermal wind diagnostic at 700 mb
• Q-vectors at 700-mb

Mesoscale analysis

• SPC mesoanalyses 
• UCAR Rap website
• SPC HRRR

SkewTs

• WXCaster website
• SPC website
• University of Wyoming
• GOES-derived
• POES-derived: 1. Continental US; 2. Global (click on subsections)

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Severe weather outlook

• SPC homepage
• Weather Prediction Center - Winter Weather

International weather

• Europe weather maps --- analysis and forecast (courtesy of Free University of Berlin's Dept of Geoscience)
• Great Britain forecast charts (from UKMET)
• West Pacific forecast charts (courtesy Hong Kong Observatory)
• Additional sites on weathercsi.net

Archive information

• Raw radar data
• NWS watches, warnings, and advisories
• Archived images
• Amazon AWS access to Level 2 radar data through an agreement with NOAA's "Big Data Project"  (registration required)
• SPC storm reports
• Weather surface map archives
• Daily weather maps back to 1871. Link to a talk on the history of weather maps here
• Archived METARs (courtesy Plymouth State University)
• Archived COCORAS precipitation reports
• NEXRAD QPE CDR (courtesy NCEI)
• Satellite archives (University of Wisconsin)
• NOAA 21-day satellite archive
• Plymouth State University weather archives (surface, satellite, radar, upper air, and model)
• Colorado State University links to archives (courtesy Andrea Schumacher; some links may be old)
• NCEI monthly climate reports