Upper Air (sounding) codes:

ABQ - Albuquerque, NM
ABR - Aberdeen, SD
ALB - Albany, NY
AMA - Amarillo, TX
BIS - Bismarck, ND
BMX - Birmingham, AL
BNA - Nashville, TN
BOI - Boise, ID
BUF - Buffalo, NY
CHH - Chatham, MA
CHS - Charleston, SC
CRP - Corpus Christi, TX
DDC - Dodge City, KS
DRT - Del Rio, TX
DTX - Detroit, MI
DVN - Davenport, IA
EPZ - El Paso, TX
FFC - Peachtree City (Atlanta), GA
FWD - Dallas/Ft. Worth, TX
GRB - Green Bay, WI
GSO - Greensboro, NC
GYX - Gray, ME (Portland, ME)
IAD - Dulles Airport, VA (Wash. DC)
ILN - Wilmington, OH
ILX - Lincoln, IL
INL - International Falls, MN
JAN - Jackson, MS
JAX - Jacksonville, FL
LBF - North Platte, NE
LCH - Lake Charles, LA
LMN - Lamont, OK
LZK - Little Rock, AR
MAF - Midland, TX
MPX - Minneapolis, MN
OAX - Omaha, NE
OKX - Upton, NY
OUN - Oklahoma City/Norman, OK
PIT - Pittsburgh, PA
RAP - Rapid City, SD
RIW - Riverton, WY
SGF - Springfield, MO
SHV - Shreveport, LA
SLC - Salt Lake City, UT
TBW - Tampa, FL
TFX - Great Falls, MT
TOP - Topeka, KS
TUS - Tucson, AZ
VEF - Las Vegas, NV