Kuala Lumpur Monsoon Activity Centre November 2011

Figure 2: Time Series of Mean Zonal Wind (ms -1 ) Averaged between
10°N – 30°N at 850-hPa for Sep – Oct 2011
2. Outgoing Long Wave Radiation (OLR)
The time series of OLR anomalies averaged between Equator and 10°N from 1 September
to 31 October 2011 as shown in Figure 3a indicates that negative OLR anomalies, signifying
enhanced convection are observed between 90°E and 120°E from the second pentad of September
to the end of October. During this period, the convective activity had an aperiodic oscillation of 5 to
10 days cycle, meanwhile suppressed convections are dominant from mid-October over the western
and central Pacific Ocean.
(a)
(b)
Figure 3: Time Series of OLR Anomalies (Wm -2 ) Averaged between 0° – 10°N (left panel) and 10°N – 20°N (right
panel) for September – October 2011