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

PilotWeather  
   Weather source for pilots, with aviation weather for your location, from Accuweather.
   http://www.pilotweather.com/

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 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.lattery.com/pilotwx