This research stems from the first author’s Ph.D. dissertation, which has been supported by the Climate Dynamics Program of the National Science Foundation under Grant ATM-8318853. She is indebted to Professor John M. Wallace of the University of Washington for his scientific mentoring. A number of professors and colleagues have contributed to the success of this research during the last two decades. They are Professors James R. Holton and Dennis Hartmann of the University of Washington and Drs. Eugene Rasmusson, K.-M. Lau, C.-H. Sui, John Christy, Richard McNider, Pete Robertson, and Gary Jedlovec. The second author has been supported under an IPA assignment to the NASA Marshall Space Flight Center, Global Hydrology and Climate Center. He is also supported by NOAA GCIP Grant GC99-473. Last, but not least, the first author thanks Dr. Tina Chen of the Computer Science Corporation for providing her a comfortable private environment in which to revise the manuscript.
Atlas, R., N. Wolfson, and J. Terry, 1993: The effect of SST and soil moisture anomalies on GLA model simulations of the 1988 U.S. summer drought. J. Climate,6, 2034–2048.
Betts, A. K., J. H. Ball, A. C. M. Beljaars, M. J. Miller, and P. A. Viterbo, 1996: The land surface–atmosphere interactions: A review based on observational and global modeling perspectives. J. Geophys. Res.,101, 7209–7225.
Bretherton, C., C. Smith, and J. M. Wallace, 1992: An intercomparison of methods for finding coupled patterns in climate data. J. Climate,5, 541–560.
Broomhead, D. S., and G. P. King, 1986: Extracting qualitative dynamics from experimental data. Physica,20, 217–236.
Chang, F.-C., 1986: On the seasonality of climate fluctuations over the contiguous United States. Ph.D. Dissertation, University of Washington, Seattle, WA, 161 pp.
——, and J. M. Wallace, 1987: Meteorological conditions during heat waves and droughts in the United States Great Plains. Mon. Wea. Rev.,115, 1253–1269.
Charney, J. G., 1975: Dynamics of deserts and drought in the Sahel. Quart. J. Roy. Meteor. Soc.,101, 193–202.
——, W. J. Quirk, S-H. Chow, and J. Kornfield, 1977: A comparative study of the effects of albedo change on drought in semi-arid regions. J. Atmos. Sci.,34, 1366–1385.
Currie, R. G., 1979: Distribution of solar cycle signal in surface air temperature over North America. J. Geophys. Res.,84, 753–761.
Douglas, M. W., 1995: The summertime low-level jet over the Gulf of California. Mon. Wea. Rev.,123, 2334–2347.
——, R. A. Maddox, K. Howard, and S. Reyes, 1993: The Mexican monsoon. J. Climate,6, 1665–1677.
Guttman, L., 1954: Some necessary conditions for common factor analysis. Psychometrika,19, 149–161.
Holopainen, E. O., 1970: An observational study of the energy of the stationary disturbance in the atmosphere. Quart. J. Roy. Meteor. Soc.,96, 626–644.
Horel, J. D., 1981: A rotated principal component analysis of the interannual variability of the Northern Hemisphere 500 mb height field. Mon. Wea. Rev.,109, 2080–2092.
Kalnay, E., M. Kanamitsu, and W. E. Baker, 1990: Global numerical weather prediction at the National Meteorological Center. Bull. Amer. Meteor. Soc.,71, 1410–1428.
——, and Coauthors, 1996: The NCEP/NCAR 40-Year Reanalysis Project. Bull. Amer. Meteor. Soc.,77, 437–471.
Kanamitsu, M., and Coauthors, 1991: Recent changes implemented into the global forecast system at NMC. Wea. Forecasting,6, 425–435.
Karl, T. R., and R. G. Quayle, 1981: The 1980 summer heat wave and drought in historical perspective. Mon. Wea. Rev.,109, 2055–2073.
——, C. N. Williams, P. J. Young, and W. M. Wendland, 1986: A model to estimate the time of observation bias associated with monthly mean maximum, minimum and mean temperatures for the United States. J. Climate Appl. Meteor.,25, 145–160.
Kerr, R. A., 1989: Hansen versus the world on the greenhouse threat. Science,244, 1041–1043.
Klein, W. H., 1952: The weather and circulation of June 1952: A month with a record heat wave. Mon. Wea. Rev.,80, 99–104.
Koster, R. D., and M. J. Suarez, 1995: Relative contributions of land and ocean processes to precipitation variability. J. Geophys. Res.,100, 13 775–13 790.
Kutzbach, J. E., 1967: Empirical eigenvectors of sea level pressure, surface temperature and precipitation complexes over North America. J. Appl. Meteor.,6, 791–802.
Labitzke, K., 1987: Sunspots, the QBO, and the stratospheric temperature in the north polar region. Geophys. Res. Lett.,14, 535–537.
Lean, J., and D. Rind, 1998: Climate forcing by changing solar radiation. J. Climate,11, 3069–3094.
Lorenz, E., 1956: Empirical orthogonal functions and statistical weather prediction. Scientific Rep. No. 1, NTIS AD 110268 M.I.T. Statistical Forecasting Project, 49 pp.
Madden, R. A., and J. Williams, 1978: The correlation between temperature and precipitation in the United States and Europe. Mon. Wea. Rev.,106, 142–147.
Mintz, Y., 1984: The sensitivity of numerically simulated climates to land-surface boundary conditions. The Global Climate, J. T. Houghton, Ed., Cambridge University Press, 79–106.
Namias, J., 1982: Anatomy of Great Plains protracted heat waves (especially the 1980 U.S. summer drought). Mon. Wea. Rev.,110, 824–838.
——, 1991: Spring and summer 1988 drought over the contiguous United States—causes and prediction. J. Climate Appl. Meteor.,22, 30–39.
Naujokat, B., 1986: An update of the observed quasi-biennial oscillation of stratospheric winds over the Tropics. J. Atmos. Sci.,43, 1873–1877.
NCDC, 1994: Time bias corrected divisional temperature–precipitation–drought data (Documentation for dataset TD-9640), 12 pp. [Available from DBMB, NCDC, NOAA, Federal Building, 37 Battery Park Ave. Asheville, NC 28801-2733.].
Nicolis, C., and G. Nicolis, 1984: Is there a climatic attractor? Nature,311, 529–532.
——, and ——, 1986: Evidence for climatic attractors. Nature,326, 523–524.
Palmer, T. N., and C. Brankovic, 1989: The 1988 U.S. drought linked to anomalous sea surface temperature. Nature,338, 554–557.
Palmer, W. C., 1965: Meteorological drought. Res. Pap. No. 45, U.S. Weather Bureau, Washington, D.C., 58 pp. [Available from Library and Information Services Division, NOAA, Washington, D.C. 20852.].
Parrish, D. F., and J. C. Derber, 1992: The National Meteorological Center’s spectral statistical interpolation analysis system. Mon. Wea. Rev.,120, 1747–1763.
Peixöto, J. P., and A. H. Oort, 1992: Physics of Climate. American Inst. of Physics, 500 pp.
Rasmusson, E., 1968: Atmospheric water vapor transport and the water balance of North America. Part II Large-scale water balance investigations. Mon. Wea. Rev.,96, 720–734.
——, 1997: North American hydrology: The evolution of an interdisciplinary perspective. Bull. Amer. Meteor. Soc.,78, 1187–1197.
——, P. A. Arkin, W-Y Chen, and J. B. Jalickee, 1981: Biennial variations in surface temperature over the United States as revealed by a singular decomposition. Mon. Wea. Rev.,109, 587–598.
Stockton, C. W., and D. M. Meko, 1983: Drought recurrence in the Great Plains as reconstructed from long-term tree-ring records. J. Climate Appl. Meteor.,33, 17–29.
Sud, Y. C., and M. J. Fennessy, 1982: A study of the influence of surface albedo on July circulation in semi-arid regions using the GLAS GCM. J. Climatol.,2, 105–125.
——, and ——, 1984: Influence of evaporation in semi-arid regions on the July circulation: A numerical study. J. Climatol.,4, 383–398.
Tang, M., and E. M. Reiter, 1984: Plateau monsoons of the Northern Hemisphere: A comparison between North America and Tibet. Mon. Wea. Rev.,112, 617–637.
Ting, M., and H. Wang, 1997: Summertime U.S. precipitation variability and its relationship to Pacific sea surface temperature. J. Climate,10, 1853–1873.
Trenberth, K. E., and G. W. Branstator, 1992: Issues in establishing causes of the 1988 drought over North America. J. Climate,5, 159–172.
——, and C. J. Guillemot, 1996: Physical processes involved in the 1988 drought and 1993 floods in North America. J. Climate,9, 1288–1298.
——, G. W. Branstator, and P. A. Arkin, 1988: Origins of the 1988 North American drought. Science,242, 1640–1645.
Vautard, R., and M. Ghil, 1989: Singular spectrum analysis in nonlinear dynamics, with applications to paleoclimatic time series. Physica D,35, 395–424.
Wallace, J. M., 1983: The climatological mean stationary waves: Observational evidence. Large-Scale Dynamical Processes in the Atmosphere, B. J. Hoskins and R. P. Pearce, Eds., Academic Press, 27–53.
——, and D. S. Gutzler, 1981: Teleconnections in the geopotential height field during the Northern Hemisphere winter. Mon. Wea. Rev.,109, 784–811.
——, C. Smith, and C. S. Bretherton, 1992: Singular value decomposition of wintertime sea surface temperature and 500-mb height anomalies. J. Climate,5, 561–576.
White, G. A., 1980: On the observed spatial scale of Northern Hemisphere transient motions. J. Atmos. Sci.,37, 892–894.