A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

 
M

M - Mesocyclone, Mach number (followed by figures), or Meters (preceded by figures)
m2/s2 -   meters squared per second squared, equivalent to J/kg.  See CAPE and CIN.
MA - Massachusetts
MAN - Manitoba
MAP -   Mean Areal Precipitation or Aeronautical maps and charts
MAR - March
MAREP -   Marine Reporting Program
MAX - Maximum
MAY - May
MB or mb -   Millibars.
MCC -   Mesoscale Convective Complex
MCD -   Mesoscale Discussion
MCDW -   Monthly Climatic Data of the World
McIDAS -   Man-computer Interactive Data Access System.
MCS -   Mesoscale Convective System
MCW - Modulated continuous wave
MD - Maryland
MDFY - Modify
MDFYD - Modified
MDFYG - Modifying
MDL - Model
MDLS - Models
MDS -   Minimum Discernible Signal
MDT - Moderate
MDTLY - Moderately
ME - Maine
MED - Medium
MEGG - Merging
MESO -   Mesocyclone or Mesoscale
MET - Meteorological or meteorology
METAR - Aviation rountine weather report (in aeronautical meteorological code)
METRO - Metropolitan
MEX - Mexico
MHKVLY - Mohawk Valley
MI - Michigan
MIC - Meteorologist-In-Charge
Micro-ART -   Microcomputer Automatic Radiotheodolite Master Control Unit
MID - Middle
MIDN - Midnight
MIFG - Shallow fog
MIL - Military
MIN - Minutes or Minimum
MISG - Missing
MLCAPE -  Mean Layer CAPE
MLLI -  Mean Layer Lifted Index
MLLW -   Mean Lower Low Water
MLOS -   Microwave Line-Of-Site
MLTLVL - Melting level
MLW -   Mean Low Water
MN - Minnesota
MNLND - Mainland
MNLY - Mainly
MNM - Minimum
MNT - Monitor or monitoring or monitored
MO - Missouri
MOD -   Meteorological Operations Division or Moderate
MOGR - Moderate or greater
MON - Above mountains or Monday
MOS -   Model Output Statistics
MOV - Move or moving or movement
MOVD - Moved
MOVG - Moving
MOVMT - Movement
MOVS - Moves
MPC -   Marine Prediction Center
MPH - Miles per hour
MPL -   Max Parcel Level
MRF -   Medium-Range Forecast model
MRGL - Marginal
MRGLLY - Marginally
MRNG - Morning
MRTM - Maritime
MS - Mississippi or Minus
MSG - Message
MSL -   Mean Sea Level
MST - Most
MSTLY - Mostly
MSTR - Moisture
MT - Montana or Mountain
MTN - Mountain
MTNS - Mountains
MTU - Metric units
MTW - Mountain waves
MUCAPE -  Most Unstable CAPE
MULI -  Most Unstable Lifted Index
MULT - Multiple
MULTILVL - Multi-level
MWO - Meteorological watch office
MX - Mixed type of ice formation (white and clear)
MXD - Mixed  


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