THE STRATOSPHERIC WARMING OVER NORTH AMERICA IN 1957. II. HEIGHT, TEMPERATURE, VORTICITY, AND VERTICAL MOTION AT THE 50-MB SURFACE
Three subdivisions are recognized for the period 16 Jan. to 16 Feb. 9a) Until about 20-21 January, a single trough extended from the high latitude low and moved slowly from the United States over the Atlantic Ocean. This trough was warm in middle latitudes, the lapse rate in the trough was positive...
| Main Authors: | , , |
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| Format: | Text |
| Language: | English |
| Published: |
1961
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| Subjects: | |
| Online Access: | http://www.dtic.mil/docs/citations/AD0259735 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0259735 |
| Summary: | Three subdivisions are recognized for the period 16 Jan. to 16 Feb. 9a) Until about 20-21 January, a single trough extended from the high latitude low and moved slowly from the United States over the Atlantic Ocean. This trough was warm in middle latitudes, the lapse rate in the trough was positive and there was descending motion west of the trough and ascending motion east of the trough. (b) From about 20-21 January until about 2 February, two troughs were usually in evidence, one extending into the southwestern United States, the other over Southern Greenland from the high-latitude low. The latter was not always defined at 50 mb and might possibly have been absent on some days. (c) During the period after about 2 February, the greatest changes took place. The high latitude low moved slowly westward and filled. The United States trough became a cold trough, particularly at 50 mb, and slowly retrogressed. A broad area of downward motion overspread nearly the entire United States and all of Canada except the northwester part. The Atlantic warm center intensified, particularly at 50 mb, and moved generally northwestward. (Author) |
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