courses:203:wx_theory
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| ===== Characteristics of Frontal Systems ===== | ===== Characteristics of Frontal Systems ===== | ||
| + | Frontal passage will be indicated by the following discontinuities: | ||
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| + | 1. A temperature change (the most easily recognizable discontinuity) | ||
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| + | 2. A continuous decrease in pressure followed by an increase as the front passes | ||
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| + | 3. A shift in the wind direction, speed, or both. | ||
| ===== Formation & Dangers of Thunderstorms ===== | ===== Formation & Dangers of Thunderstorms ===== | ||
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| Stratiform clouds are the flat, more evenly based clouds formed in stable conditions. They produce steady, continuous light rain and drizzle made up of much smaller raindrops. | Stratiform clouds are the flat, more evenly based clouds formed in stable conditions. They produce steady, continuous light rain and drizzle made up of much smaller raindrops. | ||
| + | The base of a cloud (AGL) that is formed by vertical currents (cumuliform clouds) can be roughly calculated by dividing the difference between the surface temperature and dew point by 4.4 and multiplying the remainder by 1,000. The convergence of the temperature and the dewpoint lapse rate is 4.4°F per 1,000 feet. | ||
| ===== Weather Hazards - Cold Weather Operation ===== | ===== Weather Hazards - Cold Weather Operation ===== | ||
courses/203/wx_theory.1519915834.txt.gz · Last modified: 2018/03/01 14:50 by evan
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