1. HEMISPHERIC MEAN CIRCULATION The 700-mb. mean circulation in th,e Northern Hemisphere
during July 1968 was characterized by a continuation of the fast westerlies which had prevailed over the Pacific during June [l]. A deep vortex (80 m. below normal) developed over northern Hudson Bay, in part contributed to by the amplification of an unusually strong ridge over the upper Yukon Valle...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.395.1389 http://docs.lib.noaa.gov/rescue/mwr/096/mwr-096-10-0746.pdf |
| Summary: | during July 1968 was characterized by a continuation of the fast westerlies which had prevailed over the Pacific during June [l]. A deep vortex (80 m. below normal) developed over northern Hudson Bay, in part contributed to by the amplification of an unusually strong ridge over the upper Yukon Valley and neighboring Arctic Ocean, where monthly mean heights were 120 m. above normal (fig. 1 and 2). Amplification progressed downstream to the Atlantic where a ridge replaced the trough which had been there in June. The 700-mb. height anomaly values increased by as much as 180 m. between June and July south of Iceland (fig. 3). As the trough moved eastward, associated storminess caused heavy rains and floods in parts of England just before the middle of the month. The trough |
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