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Feb 13, 2024 · 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.
Oct 11, 2024 · Surface Analyses. The surface analyses show plots of surface station readings, lines of equal Mean Sea Level air pressure (called isobars), fronts (as drawn in by CMC meteorologists) and centres of high and low pressure.
Dec 4, 2021 · A station plot, shown in B above, displays temperature (57°F), dew point (24°F), the weather occurring at the time of observation (moderate rain), sky cover (overcast), wind (48-52 kts), sea level pressure (1010.3 mb), and the pressure trend.
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.
Once each location has a sea level pressure, they can be compared to each other to determine where relative low and high pressures are distributed across the map. Another huge difference between surface and upper air charts is the marking of fronts.
The central pressure of a shallow Low is above 1000 hPa, of a moderate Low 980-1000 hPa, and of a deep or intense Low below 980hPa. If there are two or more centres the Low is said to be complex. If the central pressure is rising the Low is said to be filling or weakening.
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Here's a relatively simple example of a surface map. Pressure, wind, temperature, cloud cover, and weather data are shown. Plotting the surface weather data on a map is just the beginning. You really can't tell, for example, what is causing the cloudy weather with rain (the dot symbols) and drizzle (the comma symbols) in the NE portion of the ...
