   Lagged cross correlations between outgoing longwave radiation
(OLR) and National Meteorological Center global analyses are
utilized to isolate the preferred upper-level and surface
circulation anomalies associated with tropical convection during
northern winter. Three intraseasonal time scales are studied:
30-70, 14-30, and 6-14 days. In the 30-70-day band, the upper-
level circulation signals are zonally elongated, with zonal
wavenumbers 0-2 dominant. Higher-frequency signals are dominated
by zonal wavenumbers 5 and 6. In the 14-30-day band, convection
over the eastern hemisphere is associated with upper-level
anticyclones in the subtropics and appears to be linked in some
cases to midlatitude wave trains. The strongest signals are for
convection over Africa, Australia, and the eastern Indian Ocean.
Only weak signals are seen for convection over Indonesia. In
these regions of upper-level easterlies, OLR anomalies peak
prior to the maximum anomalies in wind, suggesting forcing of
the circulation by tropical