| 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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