I figured I would start it, and add to it as I have time. Anybody else is welcome to help. Just PM me with your list and I will add it to this post to reduce confusion.

**I am only giving the meaning of the acronyms. If you want to know what the terms themselves mean, then you should be able to use the information I am giving you to return more results with Google. (Or you can always ask one of our resident experts)**

*I have also noticed that it is slightly outdated in some respect. I will be adding and altering in the near future.

Places:
OV - Ohio Valley
GOM - Gulf of Mexico
NA - North America

NOAA and NWS:
NOAA - National Oceanic and Atmospheric Administration
NWS - National Weather Service
SPC - Storm Prediction Center
FA- Forecast Area

Airport Codes:
These are also referred to without the beginning "K"
KCVG - Cincinnati/Northern Kentucky International Airport
KHAO - Butler County Regional Airport
KLUK - Cincinnati Municipal Airport - Lunken Field
KDAY - James M. Cox Dayton International Airport

Models:
GFS- Global Forecast System
NAM - North American Mesoscale
CMC - Canadian Meteorological Center
Euro/ECMWF - European Center for Medium range Weather Forecasting
GEM - Global Environmental Multiscale
CFS - Climate Forecast System
RUC - Rapid Update Cycle

Radar terms:
RADAR - Radio Detecting And Ranging
TVS - Tornado Vortex Signature - a symbol that pops up on Radar when Radar is indicating that a tornado may be present. Often an upside down purple triangle.
POH - Possibility of Hail - Usually found under "Storm Attributes" on some Radar screens
POSH - Possibility of Severe Hail - Usually found under "Storm Attributes" on some Radar screens. It refers to the possibility of hail in a orgy meeting or exceeding severe limitations.

Watches and Warnings:
The "w"s on the end can also mean "Warning", but in most cases "Warning" will be typed out.
FFW - Flash Flood Watch
WSW - Winter Storm Watch
WWA - Winter Weather Advisory

General Weather:
WAA - Warm Air Advection
CAA - Cool Air Advection
CAPE - Convective Available Potential Energy
HW - Heat Wave
OSF - Offshore Flow

Advanced Weather:
NAO - North Atlantic Oscillation
ENSO - El Nino-Southern Oscillation
QBO - Quasi-Biennial Oscillation
MJO - Madden-Julian Oscillation
CV - Canadian Vortex

Marine Weather:
MW - Marine Weather
ML - Marine Layer

Measurements:
hPa - Hectopascal

Times:
GMT, z, and UTC - Greenwich Mean Time, Zulu, and Universal Time Coordinated. They are all the same thing and refer to the time in Greenwich, England. For our time deduct 4 hours during Daylight Savings Time, and 5 hours during Standard Time.
EST - Eastern Standard Time
EDT - Eastern Daylight Time
DST - Daylight Savings Time

Just for Fun:
RATIC - Run A Tornado is Coming

Thanks for putting this up, Aaron!

Yeah...I started it years ago (2007-ish). It took me about a week to get where I am, then I completely forgot about it. lol.

Dang...wish I had that before I made that list back in 2007. I would have just linked to it

LOL - sorry - we should prob load the html, convert it to a pdf or something on here? Take only the definitions?

Alright, thanks =)