Spatial Variability of Midtropospheric Circulation Patterns and Associated Surface Climate in the United States During Enso Winters

Keables, Michael J.

doi:10.1080/02723646.1992.10642461

Cited by 16 publications

(16 citation statements)

References 30 publications

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“…On the other hand, La Niña winters are characterized by lower atmospheric pressures over central and western Canada (Rogers 1984;Trenberth and Caron 2000), favoring more continental storm activity in the Midwest and St. Lawrence storm tracks (Kunkel and Angel 1999). Still, evidence for a consistent NE hydroclimatic response to ENSO remains elusive: regional precipitation is sensitive to many other factors that are unrelated to variability in ENSO, such as the mean location of the East Coast trough (Keables 1992;Bradbury, Keim, and Wake 2002). Other considerations may include the strength of individual El Niño and La Niña events and the indices chosen to define them (Noel and Changnon 1998).…”

Section: Previous Studies Of Regional Cyclone Activitymentioning

confidence: 95%

The Influence of Regional Storm Tracking and Teleconnections on Winter Precipitation in the Northeastern United States

Bradbury

Keim

Wake

2003

Annals of the Association of American Geographers

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Secular changes in regional storm tracking are examined as physical mechanisms for observed teleconnections between the New England hydroclimate and four predictor variables: the Southern Oscillation Index, the North Atlantic Oscillation, the Pacific Decadal Oscillation, and regional sea-surface temperatures. The main modes of New England winter precipitation, snowfall, and cyclone variability are resolved using varimax rotated principal component analysis. The first rotated principal component of regional cyclone variability defines an out-of-phase relationship between marine versus continental cyclone activity and is statistically linked with the Southern Oscillation, the Pacific Decadal Oscillation, and precipitation in northern New England. Also, El Niño winters generally accompany a slight increase in southern New England precipitation. The second cyclone rotated principal component, defining an inverse relationship between cyclone occurrences along the East Coast and cyclone occurrences along the northern boundary of the Gulf Stream, is well correlated with regional precipitation and snowfall, demonstrating the significance of marine storm tracking as a control on New England winter hydroclimatic variability.Extreme North Atlantic Oscillation conditions are linked with distinct regional storm tracking patterns such that northwestern New England experiences fewer cyclones during negative North Atlantic Oscillation winter months. Statistical relationships between sea-surface temperatures and principal modes of regional cyclone occurrences are also noteworthy; however, more work is needed to assess the utility of sea-surface temperatures in the development of future seasonal forecasts. Also, confirming earlier findings, cool sea-surface temperature conditions are shown to accompany both drier conditions inland and greater winter snowfall totals in southern coastal regions.

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Section: Previous Studies Of Regional Cyclone Activitymentioning

confidence: 95%

The Influence of Regional Storm Tracking and Teleconnections on Winter Precipitation in the Northeastern United States

Bradbury

Keim

Wake

2003

Annals of the Association of American Geographers

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“…Conversely, the reverse PNA pattern results in a zonal (non-sinuous) flow and below-average precipitation in the Southwest. The PNA pattern can also exist in a modified form, during which the centers of activity are displaced to the east (Keables 1992). The modified PNA pattern is associated with an increase in precipitation in the Southwest due to a combination of heightened southwesterly flow originating in the tropical Pacific and a southward shift of the westerly storm tracks (Woodhouse 1997 .…”

Section: Winter Climate Features and Processesmentioning

confidence: 99%

The climate of the US Southwest

Sheppard¹,

Comrie

Packin³

et al. 2002

Clim. Res.

505

394

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“…It is known that great distortions of the PNA pattern are possible, to the extent that the resulting anomaly pattern only vaguely (if at all) resembles the PNA configuration (Yarnal and Diaz, 1986;Kushnir and Wallace, 1989;Keables, 1992). Often these distortions are due to the influence of other teleconnection patterns.…”

Section: Role Of Individual Teleconnection Indices a The Pol Indexmentioning

confidence: 99%

“…Thus, Keables (1992) identified three types of the PNA-like circulation. Two of these types are associated with predominantly negative SAT anomalies in the Great Lakes region.…”

Section: Role Of Individual Teleconnection Indices a The Pol Indexmentioning

confidence: 99%

Atmospheric teleconnection patterns and severity of winters in the Laurentian Great Lakes basin

Rodionov

Assel

2000

Atmosphere-Ocean

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We analyzed the relationship between an index of Great Lakes winter severity (winters 1950-1998) and atmospheric circulation characteristics. Classification and Regression Tree analysis methods allowed us to develop a simple characterization of warm, normal and cold winters in terms of teleconnection indices and their combinations. Results are presented in the form of decision trees. The single most important classifier for warm winters was the Polar/Eurasian index (POL).

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Spatial Variability of Midtropospheric Circulation Patterns and Associated Surface Climate in the United States During Enso Winters

Cited by 16 publications

References 30 publications

The Influence of Regional Storm Tracking and Teleconnections on Winter Precipitation in the Northeastern United States

The Influence of Regional Storm Tracking and Teleconnections on Winter Precipitation in the Northeastern United States

The climate of the US Southwest

Atmospheric teleconnection patterns and severity of winters in the Laurentian Great Lakes basin

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