1. ISSUES RELATED TO WINTER MONSOON IN MALAYSIA
Subramaniam Moten
Malaysian Meteorological Department
1ST MAHASRI ISSC Meeting, Oct 2006, Bangkok, Thailand

2. OUTLINE Rainfall characteristics Synoptic features
Characteristics of SST over the SC sea

3. MEAN ANNUAL RAINFALL (mm) FOR MALAYSIA

4. Mean Monthly Rainfall (cm)

5. STEAMLINE ANALYSIS AT 850 hPa LEVEL
NOVEMBER
DECEMBER
JANUARY
FEBRUARY

6. 1951/12 to 2002/02 all vortex centers
C.P. Chang et al, 2002

8. RAINFALL FREQ FOR DIFF INTENSITIES
RAINFALL FREQUENCY
RAINFALL FREQ FOR DIFF INTENSITIES
BAYAN LEPAS
BAYAN LEPAS
MELAKA
MELAKA
KOTA BHARU
KOTA BHARU

9. DAILY RAINFALL KOTA BHARU KUANTAN KOTA BHARU MERSING KOTA BHARU
KUCHING

11. Intraseasonal Oscillation in Monsoon Rainfall
PERIOD (DAYS)
Spectra of Monsoon Rainfall (Nov – Feb)
All Years
El Nino Years
La Nina Years
Spectra of Monsoon Rainfall (Nov – Feb)
Peak Oscillation centered around 30 days
Intraseasonal Oscillation in Monsoon Rainfall

12. STANDARDIZED ANNUAL RAINFALL ANOMALY
PENINSULAR MALAYSIA
SABAH & SARAWAK

14. Montly Mean SST Gradient over South China Sea

15. Time Series of Seasonal and Annual SST anomaly over the South China Sea

16. Power Spectrum of Annual SST Over The South China Sea
7 years
17 years

17. Time-Longitude Section of SST Correlation between South China Sea and Equatorial Pacific at Lag –2

18. 1000 HPA WIND VECTOR ANOMALY DURING POSITIVE SST ANOMALY FOR JANUARY
1000 HPA WIND VECTOR ANOMALY DURING NEGETIVE SST ANOMALY FOR JANUARY

19. Composite OLR during El Nino (January)
Composite OLR during La Nina (January)
Composite SST during El Nino (January)
Composite SST during La Nina (January)

20. Composite OLR during El Nino (February)
Composite OLR during La Nina (February)
Composite SST during El Nino (February)
Composite SST during La Nina (February)

21. Issues relevant to winter monsoon
Monsoon Vortex (Borneo Low)
Cold Surges and Heavy rain episodes
Intraseasonal Oscillation
Interannual Variability
SST over the South China Sea

22. THANK YOU