. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. AEROGRAPHER'S MATE 3 & 2 Pacific origin. Surface temperatures are colder, and the vertical extent of the convective activity is less. Maritime polar air also affects the south Alaskan coast but seldom reaches the Alaskan interior due to the mountain ranges which it must cross. In western Europe, mP air masses predomi- nate. They are quite varied in the weather they cause, depending on whether their trajectories are cyclonic or anticyclonic. The most unstable conditions are the rule with a cyclonic tra- jectory.
. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. AEROGRAPHER'S MATE 3 & 2 Pacific origin. Surface temperatures are colder, and the vertical extent of the convective activity is less. Maritime polar air also affects the south Alaskan coast but seldom reaches the Alaskan interior due to the mountain ranges which it must cross. In western Europe, mP air masses predomi- nate. They are quite varied in the weather they cause, depending on whether their trajectories are cyclonic or anticyclonic. The most unstable conditions are the rule with a cyclonic tra- jectory. In the Southern Hemisphere, mP air is the most prevalent air mass and is quite similar to its Northern Hemisphere counterpart in characteristics and in the weather it causes. MARITIME TROPICAL (mTv. —The mT air which is formed over the Gulf of Mexico is usually conditionally unstable. This instability may be released by frontal or orographic lifting. When mT air is forced up in the eastern mountains of the United States, practically the same types of weather result as were discussed under the Great Lakes effect. However, the weather associated with the mT air is more intense because of the greater quantity of moisture involved, and extends to a higher level. If mT idr is forced over mountainous terrain, as in the eastern part of the United States, the conditional instability of the air is released at higher levels. (See fig. 14-6.) This might produce thunderstorms or at least large cumuliform clouds. These clouds may develop out of stratiform cloud systems and therefore may be encountered without warning when flying within the clouds. Icing may also be present. Thus, as with the Great Lakes effect, a combination of all three hazards (fog, thunderstorms, and icing) is possible. Now consider the weather associated with maritime tropical warm air (mTw) of Atlantic origin. In winter, when the land surface is relatively cold, the mT air moves northward as mTw. It is cooled from b
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Keywords: ., bookcentury1900, booksubjectmeteorology, booksubjectunitedstates
