Search citation statements
Paper Sections
Citation Types
Year Published
Publication Types
Relationship
Authors
Journals
SUMMARY This paper reviews qualitative results of study of 35 mm. moving pictures taken of PPI scopes of 23 cm. radar installations on the southeast coast of New England during spring and autumn migrations in 1959 and 1960. Gulls, waders and passerines are readily distinguished from each other; small, medium, and large movements are easily separated. New England weather is controlled by eastward flow of large air masses out of the continent of North America or the Gulf of Mexico. These take several days to cross New England, so that short‐range weather forecasts are more reliable than in northwestern Europe. Winter is characterized by regular eastward passage of air masses. Wintering buntings increase their fat deposits in low temperatures and move their feeding grounds with storms. Unstable early spring weather marks the end of winter. Early spring migrants respond to 10° rise in temperature and usually move with overcast skies. The dispersal of flocks of wintering Tree Sparrows studied over five years and conspicuous first arrivals of spring migrants, including large flocks of day‐migrating icterids, may be as early as 22 February or as late as 10 April and coincide with the first moderate movements on radar. Late spring is marked by orderly flow of maritime air up the east coast of North America, either with the movement of low‐pressure systems or with circulation around the Bermuda high. Late spring migrants are more regular in their schedule of arrival and respond to clear skies, rising temperatures, and favourable winds. In mid‐ and late May, stalling of the warm air in a reentrant centred over coastal New England results in the grounding of large numbers of birds which winter in Central and South America. Week‐long rain resulting from such stalled weather produces especially large movements when the skies clear. Passage of a sharp cold front stimulates reversed migration during spring months, more marked in March and April, but still evident in May. In early August, adults start to migrate and continue as a steady flow in small numbers, which increase with the passage of each cold front until early September. As the sun's declination falls, cold continental polar air masses cross New England, accompanied by increasingly evident cold fronts and falls of temperature during September and October. Warblers and thrushes move with each cold front in early September; buntings join them in late September and become predominant among night migrants in October. In September, tropical storms on the Atlantic coast bring southern stragglers with them. Wintering buntings appear and day‐migrant icterids again are conspicuous in October and November, with continued cold fronts and stalled high‐pressure systems of Indian Summer. The first freezing weather sends icterids, geese, White‐throated and Fox Sparrows farther south in reversed order of spring arrivals. Unstable early spring weather marks the end of winter. Unstable stalled air masses and late autumn northeast storms forecast winter's arrival. Early spring migration...
SUMMARY This paper reviews qualitative results of study of 35 mm. moving pictures taken of PPI scopes of 23 cm. radar installations on the southeast coast of New England during spring and autumn migrations in 1959 and 1960. Gulls, waders and passerines are readily distinguished from each other; small, medium, and large movements are easily separated. New England weather is controlled by eastward flow of large air masses out of the continent of North America or the Gulf of Mexico. These take several days to cross New England, so that short‐range weather forecasts are more reliable than in northwestern Europe. Winter is characterized by regular eastward passage of air masses. Wintering buntings increase their fat deposits in low temperatures and move their feeding grounds with storms. Unstable early spring weather marks the end of winter. Early spring migrants respond to 10° rise in temperature and usually move with overcast skies. The dispersal of flocks of wintering Tree Sparrows studied over five years and conspicuous first arrivals of spring migrants, including large flocks of day‐migrating icterids, may be as early as 22 February or as late as 10 April and coincide with the first moderate movements on radar. Late spring is marked by orderly flow of maritime air up the east coast of North America, either with the movement of low‐pressure systems or with circulation around the Bermuda high. Late spring migrants are more regular in their schedule of arrival and respond to clear skies, rising temperatures, and favourable winds. In mid‐ and late May, stalling of the warm air in a reentrant centred over coastal New England results in the grounding of large numbers of birds which winter in Central and South America. Week‐long rain resulting from such stalled weather produces especially large movements when the skies clear. Passage of a sharp cold front stimulates reversed migration during spring months, more marked in March and April, but still evident in May. In early August, adults start to migrate and continue as a steady flow in small numbers, which increase with the passage of each cold front until early September. As the sun's declination falls, cold continental polar air masses cross New England, accompanied by increasingly evident cold fronts and falls of temperature during September and October. Warblers and thrushes move with each cold front in early September; buntings join them in late September and become predominant among night migrants in October. In September, tropical storms on the Atlantic coast bring southern stragglers with them. Wintering buntings appear and day‐migrant icterids again are conspicuous in October and November, with continued cold fronts and stalled high‐pressure systems of Indian Summer. The first freezing weather sends icterids, geese, White‐throated and Fox Sparrows farther south in reversed order of spring arrivals. Unstable early spring weather marks the end of winter. Unstable stalled air masses and late autumn northeast storms forecast winter's arrival. Early spring migration...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.