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The online Glossary of Meteorology is recommended as a resource for reviewing basic meteorology terminology and concepts.
NWS JetStream Weather School
NWS Publications
NWS Directive/NWS Operations and Services
Fundamentals of Atmospheric Science (Penn State Univ)
Climate Change
Global Warming - Climate (EPA)
Climate.org (Climate Institute)
Anthropogenic Threats to Corals (NOS)
Encyclopedia of the Atmospheric Environment (Atmosphere, Climate & Environment Information Progamme)
Climate Variability
El Nino (UCAR)
Basic Concepts & Terminology
WW2010 Online Guides: Midlatitude Cyclone (Univ. of Illinois)
WW2010 Online Guides: Air Masses and Fronts (Univ. of Illinois)
Feature Analysis
Reexamining the Cold Conveyor Belt (David Schultz, NSSL)
Life Cycle
Atmospheric Blocking (The Weather Prediction.com)
Instruments
ASOS (NWS)
Requirements and Standards for NWS Climate Observations (NWS)
Data
METAR (NOAA)
Units (NWS)
Weather Maps
Station plots
Station plots (Univ. of Wisconsin)
Facts
Flash Floods and Floods...the Awesome Power! (NOAA)
Flooding (The Weather Channel)
Flood Mitigation
NOAA
FEMA
Informing the Public
Floods (NOAA)
Jetstream (NWS)
Types of Models
Ensemble Prediction Systems (NCEP)
Model Derived Products
NWS/Environmental Modeling Center
Atmospheric Structure and Composition
UCAR Learning Zone (UCAR)
PhysicalGeography.net: Introduction to the Atmosphere (Okanagan University College)
Hydrostatic Equilibrium
Hydrostatic Balance (Penn State University)
Cloud Physics
Cloud Physics (Penn State)
Dual-Polarization Radar Training
Doppler Radar
Jetstream:Doppler Radar (NWS SRH)
NWS New Technology - Radar Signatures
Tracking the Southwest Monsoon (NWS)
WW2010 Online Guides: Satellite Meteorology (Univ. of Illinois)
Classifying Events
Tornado FAQ (SPC)
Enhanced Fujita Tornado Damage Scale (SPC)
Air Quality
Air Quality Index (AQI) - AIRNow (EPA)
UV Radiation
SunWise Program (EPA)
The Shadow Rule (NCBI)
Lightning
NASA Lightning Primer (NASA)
Watersheds
Watersheds (EPA)
Weather Folklore
Weather Almanac: Groundhog Day (STORMFAX®)
Weather Proverbs (The "Weather Dude")
Earthquakes
Earthquake FAQs (USGS)
Earthquake Survival (Univ. of Memphis)
Earthquake Magnitudes (USGS)
Common Myths about Earthquakes (USGS)
Earthquake Lists, Maps, and Statistics (USGS)
Space
NOAA Space Weather Prediction Center (SWPC)
Windows to the Universe (UCAR)
Astronomy Pictures of the Day (NASA)
Solar and Lunar Eclipses (National Geographic)
Rotation of the Moon (Fort Lewis College)
Stardate Online Glossary (University of Texas)
NASA Explorers
Constellations and their Stars (Go Astronomy)
NWS National Hurricane Center
Tornadoes and Tropical Cyclones
NOAA Hurricane Research Division
NOAA Weather Radio
Tornadoes
Thunderstorms, Tornadoes, Lightning ... Nature's Most Violent Storms
Severe Thunderstorms
Disaster Safety (American Red Cross)
Lightning Primer (NASA, safety information on page 4)
Hurricanes
Hurricane Safety Tips and Resources (NWS)
Flooding
Hazard Information (FEMA)
Impacts of flooding on automobiles (NWS)
TURN AROUND DON'T DROWN™ (NWS)
Winter Storms
Winter Storms...The Deceptive Killers (NWS)
Winter Storms and Extreme Cold (FEMA)
Wind Chill Chart (NWS)
Heat Safety
Emergency Preparedness and Response - Natural Disasters (CDC)
AIRNow (EPA)
How Winter Storms Form (UCAR)