Upper Midwest Aviation Weather

Central reference for aviation weather resources, focusing on current and forecast conditions in the upper midwest region of the US, including Minnesota, Wisconsin, South Dakota, North Dakota, and Iowa.
http://weather.cloud7.org/

Northwest Airlines Meteorology

Providing weather forecasting products for the aviation industry, including specialized turbulence and thunderstorm forecasts.
http://www.nwa.com/weather

Landings: Aviation Weather

Large database of aviation specific weather links.
http://www1.drive.net/evird.acgi$pass*15878422!_h-www.landings.com/_landings/pages/wthr/av_weather.html

METARTAF Aviation Weather Delivery Service

Send current METARs and TAFS for US airports to any email address
http://www.metartaf.com

Base Ops

Aviation Weather for Flight Preparation with TAF Metar Sigmet Radar and Sat-pictures.
http://www.baseops.de/

Data Transformation Corp DUAT

FAA's Direct User Access Terminal service provides free aviation weather and flight planning for certified pilots in the US.
http://www.duat.com

Ace's Pilot Shop Weather Data

Aviation weather and flight planning, including forecasts, observations, weather maps, DUATS briefings, icing, and turbulence.
http://www.acespilotshop.com/wx2.htm

Winds and Temperatures Aloft

By selecting one of over 160 continental cities in the U.S.A. or one of 30 cities in Alaska, you can obtain wind direction, speed, and temperature forecasts.
http://www.usairnet.com/cgi-bin/Winds/Aloft.cgi

Weather Briefing for Pilots

Weather links to various weather information sources for pilots.
http://pilotweather.topcities.com

Aviation Digital Data Service (ADDS)

Comprehensive user-friendly aviation weather graphics including icing, turbulence, and convection. Also includes a "Flight Path Tool" for pilots.
http://adds.aviationweather.noaa.gov/

Aviation Weather Center

The National Weather Service's aviation weather site with official forecast products as well as experimental products.
http://aviationweather.noaa.gov/

Enflight

Obtain plain-language weather briefings using exclusive WXpert translation. View up-to-date weather graphics. Helps prepare and file flight plans. Available both on the Web and on mobile PDAs (Palm i705, etc.)
http://www.enflight.com/

Pilot's Guide to Aviation Weather Services

An online brochure to help pilots use the "National Aviation Weather System."
http://www.nws.noaa.gov/om/brochures/pilot.htm

SA Weather Service - Aviation

Provides weather services for the aviation industry in Southern Africa. Includes metars, sigmet charts and forecasts.
http://aviation.weathersa.co.za

WSI

Provides pre-flight and in-flight weather information. Aviation weather also available online through WSI Pilotbrief.
http://www.wsi.com/solutions/aviation/

Flying in Europe

Weather information for flying in Europe, including all airport notams, calculations, country information, airport webcams, FBO database, and all aviation abbreviations.
http://www.flyingineurope.be

Pilot Weather Briefing

Free weather information for pilots, including surface conditions, upper level winds, turbulence, icing, thunderstorms, TAFs and Metars, radar and satellite images.
http://www.pilotweatherbriefing.com