Ceiling and Visibility Analysis Product from ADDS

The NWS Aviation Weather Center is releasing a new tool on 24 July, when the Ceiling and Visibility Analysis Product goes live on ADDS.

CVA presents simplified area maps of ceiling, visibility and flight category outlined as:

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).

CVA is intended to accompany other aviation weather products such as METARS, AIRMETS, TAFs and Area Forecasts to help the general aviation pilot (particularly the VFR-only pilot) avoid IFR conditions. To remain current in rapidly changing conditions, CVA is updated every 5 minutes using the latest observations. The use of CVA should be followed by further examination of METARs, TAFs, AIRMETs, Area Forecasts and other weather information.

CVA primarily is intended to help the general aviation pilot; however, CVA’s quick-glance overview of ceiling and visibility conditions can be useful to others involved in flight planning or weather briefing.

CVA initially will be available only via the ADDS website at:



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