Online guides from the University of Illinois: educational modules on weather

Forces and winds
Clouds and precipitation
Air masses and fronts
Midlatitude cyclones
Guide to reading weather maps
Weather forecastiing
Severe storms
Hurricanes
El Nino
Hydrologic cycle

General list of weather-related sites

An Introduction to Weather and Climate (class from Univ. Wisconsin - Madison)
Real-time composite satellite image of continental U.S.
U. of Wisconsin Space Science and Engineering Center - images and data
National Climatic Data Center
    Hazards and Climate Extremes from NCDC
Extreme weather and climate events
NCDC Historical GOES Browse Server (pick a satellite image for any day in the last 6 years)
UNISYS Weather
Current weather information - University of Illinois
The Weather Channel
Interactive U.S. Climate pages
Historical significant events imagery - searchable for different types of weather events

Clickable Map of US States - Climatic records
WeatherNet
Gallery of weather satellite images
Some global climate data sets
Climate research and applications from National Climatic Data Center (includes climatic events for 1997-2002)
Climate products and publications from National Climatic Data Center
Types of weather data available from Unidata
National Drought Mitigation Center

Extratropical cyclones

Historical significant events imagery - click on extratropical low-pressure systems
Extratropical cyclone of Oct. 16-17, 2002

Tropical cyclones

Frequently asked questions (start here!)
Course module on tropical cyclones from Univ. South Carolina
Hurricanes (the online guide from Univ. Illinois, listed above also)
The Tropical Meteorology Project at Colorado State University
    note: for the above site, you need to scroll right to see most of the content
National Hurricane Center Tropical Prediction Center
Images of Hurricanes and Other Storms
 Hurricane Isidore approaching Louisiana - radar animation

    Hurricane Georges approaching Gulf Coast - Sept. 28, 1998 (4.6 mb MPEG)
    Hurricane Georges striking Dominican Republic - good view of eye (September 22) (excellent picture)
CIMSS Tropical Cyclones page
Hurricane Lili
Animations from NASA
NASA advanced visualization (includes an animation of Hurricane Andrew, 1992)
JHU/APL Atlantic Hurricane Track Maps
NOAA field experiments on genesis of tropical cyclones


Severe storms

Severe storms (the online guide from U. Illinois, listed above also)
The online tornado FAQ
The tornado project
Vortex: unraveling the secrets (from NOAA)
Severewx.com
Cross-section through a tornado-producing supercell
National Severe Storms Laboratory
The storm machine
 

Storm chaser homepages

Stormtrack stormchaser home page
Stormchaser.com
Cyclone Jim
Greg Stumpf's Weather Links page
Nebraska Storm chaser page
Kansas tornado chasers

El Nino

El Nino theme page, from NOAA
        make sure you look at the pages on the most recent El Nino/La Nina cycle and on impacts of ENSO
El Nino (the online guide from U. Illinois, listed above also)
Tracking El Nino--NOVA Online Adventure
National Academy of Science El Nino/La Nina page
NASA El Nino page
ENSO page from the Climate Diagnostics Center
Experimental El Nino Forecast
Climate Prediction Center El Nino/La Nina homepage
The ENSO Signal Newsletter
NOAA/OGP El Nino-Southern Oscillation Page
Jet Propulsion Laboratory El Nino watch
El Nino watch from space
World Meteorological Organization El Nino page
El Nino animations and graphics
Animations of El Nino and La Nina events
Comparison of 2 big El Nino events
Pacific ENSO Applications Center
The effects of El Nino on marine life
U.S. Geological Survey news on El Nino
Effects of El Nino on streamflow, lake level and landslide potential
USAID famine early warning system - tracking El Nino/La Nina
Other El Nino sites
North Atlantic Oscillation (NAO) - not the same as El Nino, but interesting