Convectively Coupled Kelvin Waves Multi-Scale Study Over Africa in 2011 Matthew Janiga.

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Presentation transcript:

Convectively Coupled Kelvin Waves Multi-Scale Study Over Africa in 2011 Matthew Janiga

Overview of Convective Events May-Present Several westward propagating episodes of enhanced convection were observed over Africa in The average propagation speeds of these events was approximately 20 ms -1, typical of convectively coupled Kelvin waves. The most intense of these events passed over Africa around June °N TRMM 3B42RT (mm day -1, shaded) and 850 hPa zonal wind anomalies (2, 4, 6 ms -1, contours)

Overview of Convective Events May-Present 0-10°N TRMM 3B42RT (mm day -1, shaded) and 850 hPa zonal wind anomalies (2, 4, 6 ms -1, contours) Westward propagating convective events are embedded within the envelope of enhanced rainfall associated with the Kelvin wave. Specifically we see two periods of especially heavy rainfall. 1.) June 8 over West Africa 2.) June 10 over East Africa

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Kelvin Wave and Mid-Latitude Trough IR (°C, shaded), 500 hPa stream function anomalies (x10 6 m 2 s -1, green contours), and 850 hPa vector wind anomalies

Case Summary A clear connection was found to an upper-level midlatitude trough as indicated by stream function anomalies and cloud pattern. Both heavy rainfall periods began in the afternoon and persisted until early morning consistent with the typical diurnal cycle over West Africa.