What does the contraction VRB in the Terminal Aerodrome Forecast (TAF) mean?

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On a Surface Analysis Chart, the solid lines that depict sea level pressure patterns are called

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What weather phenomenon is implied within an area enclosed by small scalloped lines on a U.S. High-Level Significant Weather Prognostic Chart?

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Which is true regarding the use of airborne weather-avoidance radar for the recognitionof certain weather conditions?

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