| A | B |
|---|
| FRONT | A BOUNDARY BETWEEN TWO AIR MASSES |
| COLD FRONT | A COLD AIR MASS MOVES UNDER A WARM AIR MASS |
| WARM FRONT | A WARM AIR MASS OVERTAKES A COLD AIR MASS AND MOVES OVER IT |
| STATIONARY FRONT | A "STAND-OFF" BETWEEN WARM AND COLD AIR |
| OCCLUDED FRONT | A COLD FRONT OVERTAKES A WARM FRONT; PUSHING WARM AIR UPWARDS |
| MARITIME POLAR AIR MASS | MOIST AND COLD AIR |
| MARITIME TROPICAL | MOIST AND WARM AIR |
| CONTINENTAL POLAR | DRY AND COLD AIR |
| CONTINENTAL TROPICAL | DRY AND WARM AIR |
| CIRROSTRATUS CLOUDS | "SEE-THROUGH" WHITE CLOUDS;OFTEN FORM AS HALO AROUND THE SUN |
| STRATUS CLOUDS | THICK,LOW SHEETLIKE CLOUDS; FOG |
| CUMULUS CLOUDS | LARGE PILE OF WHITE,FAIR WEATHER CLOUDS |
| ALTOCUMULUS CLOUDS | ROUNDED HEAPS OF MEDIUM LEVEL CLOUDS |
| LOW CLOUDS | THE CATEGORY OF CLOUDS THAT HAVE AN ALTITUDE OF UP TO 8000 FEET |
| MEDIUM CLOUDS | THE CATEGORY OF CLOUDS THAT HAVE AN ALTITUDE OF 8000-15000 FEET |
| HIGH CLOUDS | THE CATEGORY OF CLOUDS THAT ARE ABOVE 15000 FEET |
| CUMULONIMBUS CLOUDS | THUNDERCLOUDS |
| SNOW, RAIN, SLEET | FORMS OF PRECIPITATION |
| mP | the abbreviation for a maritime polar air mass |
| cT | the abbreviation for a continental tropical air mass |
