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Product Legends. Surface Fronts and Boundaries In addition to High and Low centers, you may see one or more of the following eight features on a surface analysis or forecast. The definitions provided below are derived from the National Weather Service Glossary. Depiction of frontogenesis and frontolysis.
A surface analysis chart overlays weather conditions on a map. Pilots use it to get a visual understanding of phenomena like pressure, temperature, wind, and precipitation in the area at a given time. The National Weather Service (NWS) generates surface analysis charts.
Introduction: A surface chart (also called surface map or sea level pressure chart) is an analyzed chart of surface weather observations. Surface Analysis Charts are computer-generated charts with frontal and pressure analysis issued from the Weather Prediction Center (HPC) at https://www.wpc.ncep.noaa.gov/html/sfc2.shtml. Surface Analysis Charts:
On surface analysis charts, a "DEVELOPING GALE" label indicates gale force winds within the next 24 hours. When the label is used on the 48, 72, or 96 hour surface forecast charts, gale force winds are expected to develop by 72, 96, or 120 hours, respectively.
Surface analysis charts show locations of fronts, highs and lows, squall lines, dry lines, and other weather phenomena that are important in understanding current weather and predicting future weather events.
A beginner's guide to reading surface weather maps, Z time, weather fronts, isobars, station plots, and a variety of weather map symbols.
Surface weather analysis charts are a treasure trove of information about regional and continent-scale weather patterns. They are full of a variety of symbols that can give a good at-a-glance view of what conditions are occuring.
The Graphical Forecasts for Aviation (GFA) web page is intended to provide the necessary aviation weather information to give users a complete picture of the weather that may impact flight in the United States (including Alaska & Hawaii), Gulf of Mexico, the Caribbean, and portions of the Atlantic and Pacific Oceans.
There are three basic surface observation sets used at the Analysis Centers: METAR (from United States and Mexico land stations) observations, SHIP (which includes ships and buoys) observations, and SYNOP (international observations coded every 3-6 hours).
Ocean Prediction Center and the Tropical Prediction Center. Black and White Surface Analysis Products. *Image may require a special TIFF viewer. Click here for more information. Surface Analyses for Aviation Interests. All products are in color on a white background. [Table of Black and White Analyses]