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| 1. The average vertical depth of this layer of the atmosphere is 36,000 feet, but varies from about 65,000 feet at the equator to 20,000 feet at the poles. |
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| 2. Within which layer of the atmosphere does temperature increase with altitude, making it a stable layer, generally devoid of significant weather? |
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| 3. At what rate does temperature decrease with height (lapse rate) in the standard atmosphere? |
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| 4. Jet streams generally flow from ________ to ________. |
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| 5. Which gas constitutes only a small percentage of the earth’s atmosphere and varies widely in both time and space, ranging from trace amounts to 4 percent by volume? |
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| 6. When an air parcel has all the water vapor it can hold, it is ________. |
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| 7. When the ________ is greater than zero, the air is unsaturated. |
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Definition
| temperature-dew point spread (/1 pts ) |
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| 8. A sinking parcel of air compresses and ________ as it encounters increasing pressure; this causes a cloud to quickly ________. |
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Definition
| warms, dissipate (/1 pts ) |
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| 9. What type of clouds look like fluffy cotton balls or heaps, indicate upward vertical motion or thermal uplift of air, and can produce severe turbulence, icing, and other hazards? |
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Definition
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| 10. Air flow around a high diverges in a ________ motion and ________, causing the air to compress and warm, which tends to dissipate clouds. |
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Definition
| clockwise, sinks (/1 pts ) |
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Term
| 11. A Continental Tropical air mass is ________ and ________. |
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| 12. A warm, moist air mass moving over a ________ surface often produces ________, poor visibility, stratiform clouds, fog, and drizzle. |
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Definition
| cold, smooth air (/1 pts ) |
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| 13. Which front moves in such a way that colder air replaces warmer air? |
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| 14. Clouds and precipitation can occur in the areas of lift along, ahead of, and behind the surface position of a/an ________ front. |
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| 15. The three necessary ingredients for precipitation formation are ________, ________, and ________. |
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Definition
| water vapor, lift, a growth process (/1 pts ) |
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| 16. What type of precipitation occurs when there is a shallow layer aloft with above freezing temperatures, with a deep layer of below freezing air based at the surface? |
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| 17. Which National Weather Service office issues Terminal Aerodrome Forecasts (TAFs)? |
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Definition
| Weather Forecast Office (WFO) (/1 pts ) |
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