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Discussion groups, forums, and newsgroups
• sci.geo.meteorology (Your browser) (Google)
• uk.sci.weather (Your browser) (Google)

Decoding raw data
• Office for the Federal Coordinator of Meteorology -- this agency sets all guidelines for U.S. weather observations and practices. Especially noteworthy is the FMH #1 which tells you all you ever wanted to know about U.S. METAR observations.
• BADC Datasets- Radiosonde Data Help File -- great info from the BADC (sort of a British UCAR) on radiosondes and how to decode the data.
• NWS Communications and Codes -- the NWS Telecommunications Gateway is responsible for processing all kinds of weather data, so they have to know the ins and outs. You'll find some interesting resources on their page.
• NWS Decoding of FOUS -- Some good information on the FOUS ETA model output tables.
• Upper air data decoding -- this great reference sheet by FSU shows you how to decode raw upper air data.

Forecasting techniques
• Chuck Doswell's writings -- an excellent start for all meteorologists. You can head directly to the formal articles, informal articles, and essays.
• Chuck Doswell's Expressions of Opinion -- these "non-official" and somewhat provocative articles from an expert meteorologist address difficult topics most forecasters prefer to avoid, such as the future of forecasting, NOAA management, forecaster training, models, and much more. A "must see"!
• ISA and other matters -- all about the International Standard Atmosphere and different methods of measuring pressure (QFE, QNH, QFF, and QNE).
• Joseph Bartlo's Excellent Weather Forecasting Articles -- it's tough to find good, informal weather articles on the Internet, so Joseph Bartlo's material stands out. Especially useful are articles on surface analysis and upper air analysis.
• Principles of Weather Analysis (U Wisc) -- also has great info if you ever wanted to know what an isallohypse was.
• Vertical coordinate systems (Texas A&M) -- all about the eta, sigma, and theta coordinate systems.

Convective forecasting
• Predicting Supercell Motion Using Hodograph Techniques -- this article from UCAR has essentials for storm forecasters.

Tropical forecasting
• Christopher Landsea's Tropical FAQ -- everything you wanted to know about hurricanes, typhoons, and tropical cyclones.

Radar
• WSR-88D Radar Coverage -- Jian Zhang's excellent maps of geographic coverage vs. range and beam blockage for the NEXRAD radar network.

Instrumentation
• Kahlsico - Weather Sciences Instrumentation
• RS80 Radiosonde Page (Sebastian Zettl) -- (in German) Interesting explanation of RS80 signal principles.
• Roger Edwards Mobile Mesonet Page -- detail of instruments used by R.J. Evans, IHOP, others.

Publications & Journals
• OU Library Access -- (requires login) Access to AMS journals.
• Purdue Maps -- institutional map orders in bulk.

Organizations
• National Weather Association -- the definitive organization for operational meteorologists.
• American Meteorological Society -- the definitive organization for research meteorologists.
• Central Iowa Chapter of the NWA -- they host a great severe weather conference every March.

Amateur & professional meteorologists
• Justin Balbierer's weather page
• Mid-Atlantic Weather Station
• Paul Kalamaras' web site
• Shawn Selder's TORNADO SCAPES (Drawings & Prints)
• Trevor's UK Weather Images

Software
• Weather Graphics Technologies -- us, of course. The single biggest source of advanced weather software.
• HF-FAX Software List -- Maurius Rensen's exhaustive list of weather software resources.
• NWS software page -- links to things like PCGRIDDS and SHARP, as well as some internal programs.
• Weather-related Software -- it hasn't been updated in 4 years, but contains lots of interesting weather software.
• WX-NET weather software -- also somewhat dated but worth looking at.

EMWIN & NOAAPORT
EMWIN is a great datastream, but if you have serious cash to blow, NOAAPORT is the way to go.
• Colorado State's Live EMWIN feed -- if you've ever been thinking about getting an EMWIN dish, you can take a look at the live data feed right here!
• EMWIN Homepage -- everything you ever wanted to know about EMWIN.
• EMWIN Transmission Protocol -- describes the format of the incoming EMWIN data.
• SFWX geostationary satellite bearing calculation -- great for pointing your dish to an EMWIN satellite (or any satellite, for that matter). You must have Java enabled.
• Zephyrus Weather Products -- a fantastic provider of electronic weather data products.
• NOAAPORT Users Guide -- for the big spender, this is your ultimate satellite weather feed.

General Pages
• FSU Rawinsonde Page -- lots of good resources for viewing data.

Model Output
• Modifiable Hodograph -- display and manipulate forecast hodographs using the Bunkers method.
• UCAR models -- our favorite site for looking at model output.
• UWYO models -- another great site for model output.
• UNISYS Weather -- a great interface to computer model output.
• CAPS -- experimental high-resolution models for the central U.S.
• LAMP Analysis Images -- a preferred site for looking at moisture return over the Gulf of Mexico.
• NCEP's ETA-10 Home Page for SAMEX -- get the experimental stuff from the horse's mouth.
• NWS Fax Charts -- all your favorite DIFAX charts right here.
• U.S. Navy Model Output -- get output from the Navy's NOGAPS model.

Radar
• NEXRAD Radar Data -- it's free! Load up on excellent radar imagery here.
• American Weather Concepts -- a subscription-based radar service.
• WeatherTAP -- another good subscription-based radar service.
• CAPS radar archive -- go back and look at radar for some of your favorite storm days.

TAFs
• European TAFs

Satellite
• GHCC (All images) -- NASA MSFC is our favorite place to get satellite imagery, including 1 km vis.
• UCAR Satellite -- our second favorite spot for satellite images.
• Alaskan satellite images
• NASA satellite imagery -- another source of satellite images.
• International Weather Satellite Images -- an interesting list of where to get all kinds of obscure imagery!
• TNRCC Texas Imagery -- some close-up sectors of Texas.

Raw Data
Note that the individual files are usually listed by hour in a format like YYMMDDHH where YY=year, MM=month, DD=day, and HH=hour.
• Florida State University (FSU) -- contains METAR, SYNOP, upper air (world) upper air (US), text data, and more.
• National Weather Service -- spiffy! Also contains METAR.
• University at Albany -- contains METAR, SYNOP, upper air, and more.
• University of California at San Diego (UCSD) -- contains METAR, upper air, and more.
• Texas A&M Weather Page -- excellent way to get METARs for a particular station going back a few days.
• NWS IWIN site -- our favorite page for getting warnings, discussions, and other products.

Plots and analyses
Of course nothing beats the capabilities of Digital Atmosphere, but if you're in a bind and need an alternate source, these sites will do nicely.
• UCAR Surface Page -- our favorite page for surface plots!
• UCAR Upper Air Page -- our favorite page for upper air plots!
• NCDC Storm Events -- by state.
• UWYO Time Series Plots -- meteograms are neat, and useful!

Historical/archive
• CODIAC Surface Station Search -- limited historical surface data.
• CIRA Satellite Page -- goes back about 4 months.