Intramonthly Indices of the Pacific/North American Teleconnection Pattern and Temperature Regimes over the United States

1998 ◽  
Vol 60 (1-4) ◽  
pp. 11-19 ◽  
Author(s):  
C. E. Konrad
Keyword(s):  
United States ◽  
North American ◽  
The United States ◽  
Teleconnection Pattern ◽  
Pacific North American ◽  
Temperature Regimes ◽  
The Pacific

scholarly journals Subseasonal prediction of springtime Pacific-North American transport using upper-level wind forecasts

2020 ◽  
Author(s):  
John R. Albers ◽  
Amy H. Butler ◽  
Melissa L. Breeden ◽  
Andrew O. Langford ◽  
George N. Kiladis
Keyword(s):  
United States ◽  
North American ◽  
Weather Forecasting ◽  
The United States ◽  
Anomalous Transport ◽  
Pacific North American ◽  
The North ◽  
The Pacific ◽  
Upper Level ◽  
Jet Variability

Abstract. Forecasts of Pacific jet variability are used to predict stratosphere-to-troposphere transport (STT) and tropical-to-extratropical moisture exports (TME) during boreal spring over the Pacific-North American region. A retrospective analysis first documents the regionality of STT and TME for different Pacific jet patterns. Using these results as a guide, Pacific jet hindcasts, based on zonal-wind forecasts from the European Centre for Medium-Range Weather Forecasting Integrated Forecasting System, are utilized to test whether STT and TME over specific geographic regions may be predictable for subseasonal forecast leads (3–6 weeks ahead of time). Large anomalies in STT to the mid-troposphere over the North Pacific, TME to the west coast of the United States, and TME over Japan are found to have the best potential for subseasonal predictability using upper-level wind forecasts. STT to the planetary boundary layer over the intermountain west of the United States is also potentially predictable for subseasonal leads, but likely only in the context of shifts in the probability of extreme events. While STT and TME forecasts match verifications quite well in terms of spatial structure and anomaly sign, the number of anomalous transport days is underestimated compared to observations. The underestimation of the number of anomalous transport days exhibits a strong seasonal cycle, which becomes progressively worse as spring progresses into summer.

scholarly journals Subseasonal prediction of springtime Pacific–North American transport using upper-level wind forecasts

2021 ◽  
Vol 2 (2) ◽  
pp. 433-452
Author(s):  
John R. Albers ◽  
Amy H. Butler ◽  
Melissa L. Breeden ◽  
Andrew O. Langford ◽  
George N. Kiladis
Keyword(s):  
United States ◽  
North American ◽  
Weather Forecasting ◽  
The United States ◽  
Anomalous Transport ◽  
Pacific North American ◽  
The North ◽  
The Pacific ◽  
Upper Level ◽  
Jet Variability

Abstract. Forecasts of Pacific jet variability are used to predict stratosphere-to-troposphere transport (STT) and tropical-to-extratropical moisture export (TME) during boreal spring over the Pacific–North American region. A retrospective analysis first documents the regionality of STT and TME for different Pacific jet patterns. Using these results as a guide, Pacific jet hindcasts, based on zonal-wind forecasts from the European Centre for Medium-Range Weather Forecasting Integrated Forecasting System, are utilized to test whether STT and TME over specific geographic regions may be predictable for subseasonal forecast leads (3–6 weeks ahead of time). Large anomalies in STT to the mid-troposphere over the North Pacific, TME to the west coast of the United States, and TME over Japan are found to have the best potential for subseasonal predictability using upper-level wind forecasts. STT to the planetary boundary layer over the intermountain west of the United States is also potentially predictable for subseasonal leads but likely only in the context of shifts in the probability of extreme events. While STT and TME forecasts match verifications quite well in terms of spatial structure and anomaly sign, the number of anomalous transport days is underestimated compared to observations. The underestimation of the number of anomalous transport days exhibits a strong seasonal cycle, which becomes steadily worse as spring progresses into summer.

Synoptic analysis of the Pacific-North American teleconnection pattern

2011 ◽  
Vol 137 (655) ◽  
pp. 329-346 ◽  
Author(s):  
Christian Franzke ◽  
Steven B. Feldstein ◽  
Sukyoung Lee
Keyword(s):  
North American ◽  
Teleconnection Pattern ◽  
Pacific North American ◽  
Synoptic Analysis ◽  
The Pacific

Half-century perspectives on North American spring snowline and snow cover associations with the Pacific-North American teleconnection pattern

2018 ◽  
Vol 74 (3) ◽  
pp. 201-216 ◽  
Author(s):  
TJ Ballinger ◽  
RV Rohli ◽  
MJ Allen ◽  
DA Robinson ◽  
TW Estilow
Keyword(s):  
Snow Cover ◽  
North American ◽  
Teleconnection Pattern ◽  
Half Century ◽  
Pacific North American ◽  
The Pacific

scholarly journals Formation Mechanisms of the Pacific–North American Teleconnection with and without Its Canonical Tropical Convection Pattern

2017 ◽  
Vol 30 (9) ◽  
pp. 3139-3155 ◽  
Author(s):  
Ying Dai ◽  
Steven B. Feldstein ◽  
Benkui Tan ◽  
Sukyoung Lee
Keyword(s):  
North American ◽  
Wave Train ◽  
Dominant Role ◽  
Teleconnection Pattern ◽  
Wave Activity ◽  
Tropical Convection ◽  
Formation Mechanisms ◽  
Convection Pattern ◽  
Pacific North American ◽  
The Pacific

The mechanisms that drive the Pacific–North American (PNA) teleconnection pattern with and without its canonical tropical convection pattern are investigated with daily ERA-Interim and NOAA OLR data (the former pattern is referred to as the convective PNA, and the latter pattern is referred to as the nonconvective PNA). Both the convective and nonconvective positive PNA are found to be preceded by wave activity fluxes associated with a Eurasian wave train. These wave activity fluxes enter the central subtropical Pacific, a location that is favorable for barotropic wave amplification, just prior to the rapid growth of the PNA. The wave activity fluxes are stronger for the positive nonconvective PNA, suggesting that barotropic amplification plays a greater role in its development. The negative convective PNA is also preceded by a Eurasian wave train, whereas the negative nonconvective PNA grows from the North Pacific contribution to a circumglobal teleconnection pattern. Driving by high-frequency eddy vorticity fluxes is largest for the negative convective PNA, indicating that a positive feedback may be playing a more dominant role in its development. The lifetimes of convective PNA events are found to be longer than those of nonconvective PNA events, with the former (latter) persisting for about three (two) weeks. Furthermore, the frequency of the positive (negative) convective PNA is about 40% (60%) greater than that of the positive (negative) nonconvective PNA.

Sign in / Sign up

Export Citation Format

Share Document