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Tropical intraseasonal variability in the eastern North Pacific during June–September of 2000–03 is\udanalyzed using satellite and buoy observations. Quick Scatterometer ocean vector winds and the Tropical\udRainfall Measuring Mission (TRMM) precipitation indicate that periods of anomalous surface westerly flow\udover the east Pacific warm pool during a summertime intraseasonal oscillation (ISO) life cycle are generally\udassociated with an enhancement of convection to the east of 120°W. An exception is a narrow band of\udsuppressed precipitation along 8°N that is associated with negative column-integrated precipitable water\udanomalies and anticyclonic vorticity anomalies. Periods of surface easterly anomalies are generally associated\udwith suppressed convection to the east of 120°W. Summertime wind jets in the Gulfs of Tehuantepec\udand Papagayo exhibit heightened activity during periods of ISO easterly anomalies and suppressed convection.\udStrong variations in east Pacific warm pool wind speed occur in association with the summertime\udISO. Anomalous ISO westerly flow is generally accompanied by enhanced wind speed to the east of 120°W,\udwhile anomalous easterly flow is associated with suppressed wind speed. Intraseasonal vector wind anomalies\udadded to the climatological flow account for the bulk of the wind speed enhancement in the warm pool\udduring the westerly phase, while the easterly phase shows strong contributions to the negative wind speed\udanomaly from both intraseasonal vector wind anomalies and suppressed synoptic-scale eddy activity. An\udanalysis using Tropical Atmosphere Ocean buoys and TRMM precipitation suggests that wind–evaporation\udfeedback is important for supporting summertime intraseasonal convection over the east Pacific warm pool.\udA statistically significant correlation of 0.6 between intraseasonal latent heat flux and precipitation occurs\udat the 12°N, 95°W buoy. Correlations between precipitation and latent heat flux at the 10°N, 95°W and\ud8°N, 95°W buoys are positive (0.4), but not statistically significant. Intraseasonal latent heat flux anomalies\udat all buoys are primarily wind induced. Consistent with the suppressed convection there during the ISO\udwesterly phase, a negative but not statistically significant correlation ( 0.3) occurs between precipitation\udand latent heat flux at the 8°N, 110°W buoy

Satellite and Buoy Observations of Boreal Summer Intraseasonal Variability in the Tropical Northeast Pacific