Aviation Meteorology

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