- If your weather map has station models, each one will plot the temperature, dew-point, wind, sea level pressure, pressure tendency, and ongoing weather with a series of symbols. Temperature is generally recorded in Celsius degrees and rainfall is recorded in millimeters. In the US, temperatures are in Fahrenheit and rainfall is measured in inches.
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May 04, 2021 · The influence of long-term global warming is obvious: The earliest map in the series has the most widespread and darkest blues, and the most recent map has the most widespread and darkest reds. Annual U.S. temperature compared to the 20th-century average for each U.S. Climate Normals period from 1901-1930 (upper left) to 1991-2020 (lower right).
- High and Low Pressure Areas. Earth’s atmosphere is a jacket of gases that surrounds the planet. Although it seems like these gases could easily float away into space, gravity is constantly pulling the atmosphere toward Earth’s surface.
- What it Means on the Weather Map. Low pressure systems—like this one in the Tennessee valley—can cause the formation of clouds and storms. A high pressure system is a dense air mass that is usually cooler and drier than the surrounding air.
- High and Low Pressure Systems: From Space. From high above Earth, satellites such as GOES-16 keep an eye on the weather brought by low pressure systems.
- Cold Fronts and Warm Fronts. A warm front is the transition area where a mass of warm air moves to replace a mass of cold air. On a weather map, a warm front is usually drawn using a solid red line with half circles pointing in the direction of the cold air that will be replaced.
- Meteorology Expert
- Zulu, Z, and UTC Time on Weather Maps. One of the first coded pieces of data you might notice on a weather map is a 4-digit number followed by the letters "Z" or "UTC."
- High and Low Air Pressure Centers. The large letters (Blue H's and red L's) on weather maps indicate high- and low-pressure centers. They mark where the air pressure is highest and lowest relative to the surrounding air and are often labeled with a three- or four-digit pressure reading in millibars.
- Isobars. On some weather maps, you may notice lines surrounding and encircling the "highs" and "lows." These lines are called isobars because they connect areas where the air pressure is the same ("iso-" meaning equal and "-bar" meaning pressure).
- Weather Fronts and Features. Weather fronts appear as different colored lines that extend outward from the pressure center. They mark the boundary where two opposite air masses meet.
Feb 16, 2011 · How can a weather map tell us about forecoming weather? a weather map shows the locations of the fronts and pressures and also their locations... What does weather forecast tell us?
National Weather Maps. Surface Analysis. Highs, lows, fronts, troughs, outflow boundaries, squall lines, drylines for much of North America, the Western Atlantic and Eastern Pacific oceans, and the Gulf of Mexico.