World Meteorological Organization - Global severe weather information center
Australian Government Bureau of Meteorology - Aussie current tropical cyclones
Canadian Hurricane Center - Canada's official tropical weather center, located in Nova Scotia
Fiji Meteorological Service - Official source of "first-level" information on tropical cyclones occurring in the South-West Pacific Ocean
India Meteorological Department - India's official weather bureau
Japan Meteorological Agency - Tropical Cyclone Information
Meteo France La Reunion - Tropical cyclone center
New Zealand Meteorological Service - Kiwi weather service
NASA Hurricane /Tropical Cyclone Web Page - Daily storm updates and satellite images, latest research, stunning video animations, educational tools, scientist profiles and historic storm information, on all storms going back to 2005, including monsters like Katrina.
Stormpulse - American ingenuity, courtesy of the private sector, has produced world's greatest mash-up of tropical weather information. Absolutely everything you need on one screen. When will Google buyout these guys?
Weather Underground - Worldwide tropical weather
South Florida's Water Management District's hurricane path models - The GFDL & HWRF models seems to be the best.
HurricaneTrack.com - News, commentary, and live reporting from hurricane sites.
Hurricane Hunters - Home of the Air Force Reserve 53rd Weather Reconnaissance Squadron, aka the "Hurricane Hunters".
Historic charts of tropical cyclones and hurricanes - Archival charts on the track of the storm plus a text based table of tracking information. Includes latitude and longitude, maximum sustained winds in knots, and central pressure in millibars.
Extreme Weather - World cities having the most unique weather over the past three hours.
Australian Weather Watch Radar Network - Australia national and local weather radar
British Isles Rainfall Radar - Great Britain national and local weather radar
Canadian Weather Radar - Canada national and local weather radar
Guadeloupe / Antilles Radar - Weather radar mosaic for Guadeloupe Island and the Antilles
Hong Kong - Hong Kong local weather radar
Jamaica Meteorological Service - Jamaica national weather radar
Korea - Korea national and local weather radar
Mexico Weather Radar - Mexico national and local weather radar
New Zealand Rain Radar - New Zealand national and local weather radar
Panama Canal Authority - Panama Canal time lapse weather radar
Puerto Rico (Haiti to Antigua) - NOAA's Puerto Rico weather radar
South Africa - South Africa national and local weather radar
Taiwan National - Taiwan national and local weather radar
Thailand - Royal rainmaker radar mosaic
U.S. radar.weather.gov - NOAA's national and local weather radar covering all of North America
Global sea surface temperatures - Current sea surface temperature plot
Global sea surface temperature anomalies - Anomalies in the sea surface temperature plot
Corla Bleaching Hot Spots - Areas that have exceeded the maximum monthly mean SST by at least one degree Celsius.
Daily Global 5km Satellite Coral Bleaching Heat Stress Monitoring - Provides near-real-time information on thermal stress that induces coral bleaching for 24 selected reef sites around the globe.
Degree Heating Week Charts - Degree Heating Weeks (DHWs) indicate the accumulation of thermal stress that coral reefs have experienced over the past 12 weeks.
Sea Surface Height Anomaly - Data relating to the difference between the best estimate of the satellite-observed sea surface height and a mean sea surface.
Worldwide Tsunami Buoy Stations - Deep-ocean Assessment and Reporting of Tsunami (DART) stations
Information on British Columbia Artificial Reef Society - mission is to create environmentally- and economically-sustainable "artificial reefs" in British Columbia and around the world
Information on California artificial reef - The Yukon. At 366' feet in length, it is one of California's largest wrecks accessible by divers
Florida - Resources from Florida's artificial reef program. Includes information on the Oriskany.
Information on Georgia's artificial reef program. Includes information on Gray's Reef National Marine Sanctuary & U.S.Navy TACS Tower
Informatio on Louisiana's artificial reef program, which largely takes advantage of obsolete oil and gas platforms.
Information on New Jersey's artificial reef program, which largely consists of old ships and barges, concrete and steel demolition debris and dredge rock sunk on the sea floor within designated reef sites.
New York - Information on New York's artificial reef program, which largely consists of rock, concrete, or steel, usually in the form of surplus or scrap materials, sunk at specific sites.
Information on South Carolina's artificial reef program, including locations of artificial reefs and wrecks.
Virginia - Information on Virginia’s Artificial Reef Program
Reef Ball Foundation - Publicly supported non-profit and international environmental NGO working to rehabilitate marine reefs.
Aquarius Monitoring Station: Conch Reef, Florida - Conch Reef Oceanographic Monitoring Station is located at NOAA's undersea research laboratory
BeachChairScientists.com -Two marine scientists bring a simplified perspective to the questions you have while relaxing on the beach.
Census of Marine Life - Global network of researchers in more than 80 nations engaged in a 10-year scientific initiative to assess and explain the diversity, distribution, and abundance of life in the oceans.
CSIRO Marine and Atmospheric Research - CSIRO Marine and Atmospheric Research (CMAR) houses Australia’s leading regional climate change modeling research teams.
ISAF (International Shark Attack File) - The International Shark Attack File is a compilation of all known shark attacks that is administered by the the American Elasmobranch Society and the Florida Museum of Natural History.
Mote Marine Laboratory - Florida's Mote Marine Laboratory is one of the world’s few remaining private marine research laboratories.
Ocean Now / National Geographic - National Geographic's Ocean Now is a project to study the last healthy, undisturbed places in the ocean. Follow Dr. Enric Sala and a team of scientists as they explore the pristine waters of the southern Line Islands.
Pelagic Shark Research Foundation - The Santa Cruz, California, based Pelagic Shark Research Foundation is an independent research, education and conservation group which specializes in shark research and management work in addition to generalized marine conservation efforts.
Scripps Institution of Oceanography - Scripps Institution of Oceanography is one of the oldest and largest centers for marine science research, graduate training, and public service in the world.
Shark Research Committee - Founded in 1962 scientific research organization, the Shark Research Committee's primary goal was to assist Leonard P. Schultz of the International Shark Attack File (ISAF) in documenting shark attacks from the Pacific Coast of North America. This initial objective was soon broadened to include conducting original research on the general biology, behavior and ecology of sharks indigenous to waters off the Pacific Coast, with particular emphasis on potentially dangerous species.
University of Miami Rosenstiel School of Marine and Atmospheric Science - The only subtropical applied and basic marine and atmospheric research institute in the continental United States
Woods Hole Oceanographic Institution - Massachusetts' WHOI is the world's largest private, nonprofit ocean research, engineering and education organization.
Algaebase - Listing the world's algae.
Cephbase - A database-driven web site on all living cephalopods (octopus, squid, cuttlefish and nautilus)
Fishbase - A search-driven global information system for fish
Reefbase - A global information system for coral reefs
Bonaire - The Bonaire webcams are home of the world's first permanent underwater ReefCam
Georgia Aquarium - Various webcams from the Georgia Aquarium
Monterey Bay Aquarium - Various webcams from the Monterey Bay Aquarium
Earthtouch new network - The "marine channel" of Earth-Touch, a wildlife documentary company.
Outdoors 720 - David Strege's outdoors blog about all things outdoors...A recipe for an outdoors blog: Take adventure, extreme sports and a fishing/hunting mixture, add a pinch of nature and wildlife, with a dash of action sports and expeditions, stir in some wild and wacky, and slowly savor the tales. Read until done
Pete Thomas Outdoors - Outdoors, action and adventure - Pete Thomas & company provide the inside scoop on what's happening outside
Southern Fried Science - Founded in 2008, Southern Fried Science is a blog by some marine science graduate students in the Carolina’s who love the ocean, science, conservation, philosophy, education, debate, and controversy.
Underwater Journal - Electronically-distributed (pdf) dive magazine with an emphasis on southeastern U.S. and Caribbean locations.