Aviation Meteorology

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AC 0 0-6A




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A VIATION"
WEATH ER

AC 00-6A

For Pil s and
Flight perations Personnel

R evised 1 975

DEPARTMENT OF TRANSPORTATION
FEDERAL AVIATION ADMINISTRATION
FI ight Standards Service

DEPARTMENT OF COMMERCE
NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION
National Weather Service

W ashington, D.C.
R eprinted b y

a sa PUBLICATIONS

E ditoria 1 N ote:
F igures 137 t hrough 139 and 142 on p ages 1 60,
1 61, a nd 165 h ave b een r earranged t o a lign w ith
t heir p roper l egends. C orresponding c orrections
h ave b een made i n t he C ontents, p age X II.

E ditorial N ote:

( 9/82)

F igures 137 t hrough 139 on p ages 160 a nd 161
have b een r earranged i n o rder t o f low i n
p roper s equence w ith t he t ext. C orresponding
c orrections h ave b een made i n t he C ontents,
page X II.

F or sale b y the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402

P reface
AVIATION WEATHER is published jointly by the FAA Flight Standards Service and the National Weather Service ( NWS). T he publication began in 1943 as CAA Bulletin No. 25, "Meteorology for Pilots," which a t the time contained weather knowledge considered essential for most pilots. But as aircraft flew farther, faster, a nd higher and as meteorological knowledge grew, the bulletin became obsolete. I t was revised in 1954 as "Pilots' W eather H andbook" a nd again in 1965 under its present title.

All these former editions suffered from one common problem. They dealt i n p art with weather services which change continually in keeping with current techniques a nd service demands. Therefore, each edition became somewhat outdated almost as soon as published; and its obsolescence grew throughout the period i t remained in print.

T o alleviate this problem, the new authors have completely rewritten this edition streamlining i t into a clear, concise, and· readable book and omitting all reference to specific weather services. Thus, the text will remain valid and adequate for many years. A companion manual, AVIATION WEATHER SERVICES, Advisory Circular 00-45, supplements AVIATION WEATHER. T his supplement (AC 00-45) periodically is u pdated to reflect changes brought about by latest techniques, capabilities, and service demands. I t explains current weather services and the formats and uses of weather charts a nd p rinted weather messages. T he two manuals are sold separately; so a t a nominal cost, a pilot can purchase a copy of the supplement (AC 00-45) periodically and keep current in aviation weather services.

C. H ugh Snyder, National Weather Service Coordinator and Training Consultant a t the FAA Academy, directed the preparation of AVIATION WEATHER a nd AVIATION WEATHER SERVICES. H e a nd his assistant, John W. Zimmerman, Jr., did much of the writing and edited the final manuscripts. Recognition is given to these meteorologists on the NWS Coordinator's staff who helped write the original m anuscript, organize the contents, and p lan illustrations: Milton Lee Harrison, Edward A. Jessup, Joe L. Kendall, a nd R ichard A. Mitchem. Beatrice Emery deserves special recognition for h er relentless effort in typing, retyping, proofing, correcting, a nd assembling page after page of manuscript. Many other offices and individuals have contributed to the preparation, editing, and publication of the two volumes.

I II

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