Aviation Weather Services, Advisory Circular 00-45G, Change 1, is published jointly by the National Weather Service (NWS) and the Federal Aviation Administration (FAA). AC 00-45G, Change 1, explains U.S. aviation weather products and services. It details the interpretation and application of advisories, coded weather reports, forecasts, observed and prognostic weather charts, and radar and satellite imagery. Product examples and explanations are taken primarily from the Aviation Weather Center’s Aviation Digital Data Service. Aviation Weather Services, Advisory Circular, AC 00-45G, Change 1, supersedes AC 00-45G. Chapters includes: AVIATION WEATHER SERVICE PROGRAM, NATIONAL OCEANIC and ATMOSPHERIC ADMINISTRATION (NOAA), FEDERAL AVIATION ADMINISTRATION, DISSEMINATION of AVIATION WEATHER PRODUCTS, AVIATION WEATHER PRODUCT CLASSIFICATION AND POLICY, CLASSIFICATION of AVIATION WEATHER PRODUCTS, Types of AVIATION WEATHER INFORMATION, AVIATION ROUTINE WEATHER REPORTS (METAR) and AVIATION SELECTED SPECIAL WEATHER REPORTS (SPECI), METAR/SPECI Type and Frequency of Lightning, PILOT WEATHER REPORTS (PIREP), RADAR WEATHER REPORT (SD/ROB), RADAR AND SATELLITE IMAGERY, SATELLITE, GRAPHICAL OBSERVATIONS, SURFACE ANALYSIS CHARTS, FREEZING-LEVEL GRAPHICS, RADAR SUMMARY CHART, PRODUCTS FOR AVIATION HAZARDS, CENTER WEATHER ADVISORY (CWA), TROPICAL CYCLONES, VOLCANIC ASH ADVISORY PRODUCTS, TERMINAL AERODROME FORECAST, INTERNATIONAL AVIATION ROUTE FORECASTS, FORECAST CHARTS, LOW-LEVEL SIGNIFICANT WEATHER (SIGWX) CHARTS, HIGH-LEVEL SIGNIFICANT WEATHER, NATIONAL CONVECTIVE WEATHER FORECAST, CURRENT ICING PRODUCT, FORECAST ICING POTENTIAL, GRAPHICAL TURBULENCE GUIDANCE, METEOROLOGICAL IMPACT STATEMENT, DEFINITION OF COMMON TERMS USED IN EN ROUTE FORECASTS AND ADVISORIES, STANDARD CONVERSION CHART, DENSITY ALTITUDE CALCULATION, ADVISORY PLOTTING CHART, WEATHER RADAR NETWORK, GEOGRAPHICAL AREA DESIGNATOR MAP, PRESENT WEATHER SYMBOLS, TURBULENCE AND ICING INTENSITY DEPICTIONS.