UA.III.A.K4
KnowledgeWeather charts.
From the FAA library
- Chapter 13: Aviation Weather Services › Weather Charts › Weather Depiction Chart
Weather Depiction Chart A weather depiction chart details surface conditions as derived from METAR and other surface observations. The weather depiction chart is prepared and transmitted by computer every 3 hours beginning at 0100Z time and is valid data ... five miles) are not outlined. Also plotted are fronts, troughs, and squall lines from the previous hours surface analysis chart. Weather depiction charts show a modified station model that provides sky conditions in the form of total sky cover, ceiling…
- Chapter 13: Aviation Weather Services › Weather Charts › Surface Analysis Chart
wind is forecast to be from 230° at a speed of 21 knots with a temperature of –4 °C. Weather Charts Weather charts are graphic charts that depict current or forecast weather. They provide an overall picture of the United ... States and should be used in the beginning stages of flight planning. Typically, weather charts show the movement of major weather systems and fronts. Surface analysis, weather depiction, and significant weather prognostic charts are sources of current weather information. Significant…
- Chapter 13: Aviation Weather Services › Weather Charts › Significant Weather Prognostic Charts
Significant Weather Prognostic Charts Significant weather prognostic charts are available for low-level significant weather from the surface to FL 240 (24,000 feet), also referred to as the 400 mb level and high-level significant weather from ... contiguous states, southern Canada and the coastal waters for altitudes below 24,000 ft. Low altitude Significant Weather charts are issued four times daily and are valid at fixed times: 0000, 0600, 1200, and 1800 UTC. Each chart is divided…
- Chapter 12: Weather Theory › Wind and Currents › Wind and Pressure Representation on Surface Weather Maps
five knots, and a pennant is equal to 50 knots. The pressure for each station is recorded on the weather chart and is shown in mb. Isobars are lines drawn on the chart to depict lines of equal pressure. These ... thousand feet above the surface. Close to the ground, Figure 12-18. Depiction of winds on a surface weather chart. L wind direction is modified by the friction and wind speed decreases due to friction with the surface. At levels…
- 25 Analysis › 25.2 Weather Charts › 25.2.1 Weather Observation Sources
Weather Charts A weather chart is a map on which data and analyses are presented that describe the state of the atmosphere over a large area at a given moment in time. The possible variety of such charts is enormous ... upper atmosphere. Because weather systems are three dimensional (3D), both surface and upper air charts are needed. Surface weather charts depict weather on a constant-altitude (usually sea level) surface, while upper air charts depict weather on constant-pressure surfaces…