Clip4
Final Approach
https://www.faa.gov/sites/faa.gov/f...supplements/flight_ground_instructor_akts.pdf
What are the small dark blue/ 2 colors of grey / red areas on Figure 2a?
1. Product Description:
Ceiling and Visibility Analysis (CVA) was developed under the Federal Aviation Administration’s Aviation Weather Research Program (AWRP). CVA is a real-time approximation of current ceiling and visibility conditions across the continental U.S. based on Meteorological Terminal Aviation Routine Weather Report (METAR) observations. CVA's ceiling and visibility fields are derived through nearest-neighbor interpolation of METAR data. This interpolation process, in effect, “stretches” limited-area METAR observations across the broader domain between stations and accounts for terrain effects on ceiling height. The resulting fields help to visualize the “likely” conditions at range from METARS.
CVA presents simplified area maps of ceiling, visibility and flight category as outlined below: Ceiling estimates are displayed as (i) “Possible Terrain Obscuration” (pale orange) for ceilings less than 200 ft agl, (ii) less than or equal to 1000 ft agl (pale yellow) from 200 to 999 ft, agl, and (iii) 1000 ft agl or greater (pale blue). Visibility estimates are displayed as (i) less than 3 miles (pale yellow), and (ii) 3 miles or greater (pale blue).
What are the small dark blue/ 2 colors of grey / red areas on Figure 2a?
1. Product Description:
Ceiling and Visibility Analysis (CVA) was developed under the Federal Aviation Administration’s Aviation Weather Research Program (AWRP). CVA is a real-time approximation of current ceiling and visibility conditions across the continental U.S. based on Meteorological Terminal Aviation Routine Weather Report (METAR) observations. CVA's ceiling and visibility fields are derived through nearest-neighbor interpolation of METAR data. This interpolation process, in effect, “stretches” limited-area METAR observations across the broader domain between stations and accounts for terrain effects on ceiling height. The resulting fields help to visualize the “likely” conditions at range from METARS.
CVA presents simplified area maps of ceiling, visibility and flight category as outlined below: Ceiling estimates are displayed as (i) “Possible Terrain Obscuration” (pale orange) for ceilings less than 200 ft agl, (ii) less than or equal to 1000 ft agl (pale yellow) from 200 to 999 ft, agl, and (iii) 1000 ft agl or greater (pale blue). Visibility estimates are displayed as (i) less than 3 miles (pale yellow), and (ii) 3 miles or greater (pale blue).
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