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Fronts & Models Eng
| Term | Definition |
|---|---|
| Front | when air masses meet but do not mix |
| Cold front | faster moving cold air meets slow moving warm air, warm air rises |
| Warm front | faster moving warm front moves over slower moving cold front |
| Stationary front | Cold and warm front meet, neither moves |
| Occluded | Warm air caught between two cold, warm air goes up |
| Cold front weather conditions | rain and thunderstorms |
| Warm front weather conditions | Light rain/snow, clear skies |
| Stationary front weather conditions | cloudy/windy/some rain |
| Occluded front weather conditions | cloudy/rainy followed by dry weather |
| Air masses | parcel of air throughout which temperature and moisture are consistent (the same) |
| Air masses take on the characteristics of... | the land or water they are over |
| Characteristics of air masses - maritime polar | wet and cold |
| Characteristics of air masses - maritime tropical | wet and warm |
| Characteristics of air masses - continental polar | dry and cold |
| Characteristics of air masses - continental tropical | dry and warm |
| Characteristics of air masses - continental arctic | dry and very cold |
| Steps to encode barometric pressure | drop either the first 9 or 10, move decimal one place to the right |
| Encode barometric pressure of 983.0mb | remove 9 (83.0), move decimal 1 right (830) -> 830 mb |
| Steps to decode barometric pressure above 500 | add 9 before the number, move decimal between last 2 numbers |
| Decode barometric pressure of 889 | add 9 (9889), move decimal between last two numbers (988.9) -->988.9mb |
| Steps to decode barometric pressure below 500 | add 10 before the number, move decimal between last two numbers |
| Decode barometric pressure of 178 | add 10 (10178) move decimal between last two numbers (1017.8) -> 1017.8mb |
| Barometric trend | the pressure for the last 3 hours |
| Barometric trend "+" | pressure is higher now than 3 hours ago |
| Barometric trend "-" | pressure is lower now that 3 hours ago |
| Weather station model: symbol on the middle left shows | current conditions |
| WSM: a whole feather is | 10 knots (wind speed) |
| WSM: a half feather is | 5 knots (wind speed) |