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Description:A guidance system to forecast open ocean fog and visibility has recently been implemented at NMC. The system, based on perfect prog statistics, forecasts fog and visibility over the open ocean during the months of April through September when these factors create significant hazards to navigation in the northern hemisphere. Although the forecasts degrade in time, evaluation of the guidance shows it to have skill against climatology through 72 hours. In the Pacific, the fog equations tend to be unbiased, while in the Atlantic they tend to underforecast fog. The visibility equations in both oceans tend to overforecast the lowest category. In the Pacific the 1200 UTC equations tend to out perform the 0000 UTC equations. In the Atlantic the reverse is true, but not as noticeably as in the Pacific.This forecast guidance is depicted on the Marine Significant Weather Chart during the months of April through September. Implementation of this system took place in September 1988.
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Content Notes:Lawrence D. Burroughs.
"January 1989."
Title from cover.
"This is an unreviewed manuscript, primarily intended for informal exchange of information."
Also available online in PDF via the NOAA Central Library.
Includes bibliographical references (pages 16-18).
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Rights Information:Public Domain
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Compliance:Library
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