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MOnthly weather bulletin JANUARY 2008 1. SUMMARY Overall, the country received average to very much above average amounts of rainfall. In most places, the temperatures recorded were higher than the long-term average value. The country recorded higher than average amounts of daily solar radiation and experienced lower rates of evaporation. 2. RAINFALL During this month, the recorded total amount of rainfall over Peninsular Malaysia was average to much above average. However, there were certain areas in northern peninsular recorded below average amount of rainfall. For Sabah and Sarawak, the recorded total amount of rainfall was below average to above average. The speed convergence and the development of cyclonic vortices have induced the convective activities particularly over southern Peninsular Malaysia and western Sarawak and have influenced the weather condition over those areas. In contrast, the northern region of Peninsular Malaysia experienced drier weather during the period. As for total monthly rainfall, over Peninsular Malaysia; Mersing recorded the highest total rainfall of 415.8 mm where as Pulau Langkawi recorded the lowest total rainfall of 0.4 mm. In Sarawak, Sibu recorded the highest total rainfall of 420.7 mm while Miri recorded the lowest total rainfall of 290.2 mm. For Sabah, Kudat recorded the highest total rainfall of 287.0 mm while Kota Kinabalu recorded the lowest total rainfall of 81.4 mm. Based on the classification scheme, there were 6 stations recorded very much above average rainfall, 4 stations recorded above average and 16 stations recorded average rainfall. Meanwhile, there were 6 stations recorded below average rainfall and 1 station recorded much below average rainfall. It was noted that Cameron Highlands (235.8 mm) had its highest monthly rainfall on record for the month of January where as Butterworth had its highest daily rainfall on record of 195.4 mm on 7th of January. The number of rainy days for Peninsula Malaysia ranged from 2 to 24 days while for Sabah and Sarawak ranged from 13 to 23 days. 3. TEMPERATURE Generally, most places in the country had higher than average temperature. The mean temperature of the month over lowland areas varied from 25.2°C to 28.5°C as recorded at Kuala Krai and Pulau Langkawi respectively. Alor Setar and Kuantan recorded the largest positive deviation of +0.7°C from normal. The mean minimum temperature over lowland areas varied from 22.1°C (Kuala Krai) and 25.5°C (Pulau Langkawi). The lowest temperature of the month was 20.7°C being recorded at Sri Aman. The mean maximum temperature over lowland areas varied from 29.0°C (Mersing) to 33.4°C (Alor Setar and Ipoh). The highest temperature registered in the month was 35.8°C, in Alor Setar. Cameron Highlands, a highland station, had temperature ranging from 14.2°C to 25.0°C with a mean temperature of 17.7°C. 4. SOLAR RADIATION The country generally received higher than average amount of solar radiation. The daily mean values varied from 14.03MJm-2 at Kuching to 20.43MJm-2 at Bayan Lepas. The largest positive and negative deviations from normal were +3.54MJm-2 and -1.46MJm-2 at Miri and Senai respectively. Cameron Highlands recorded the mean daily solar radiation at 13.06MJm-2 with the deviation of -1.46MJm-2. 5 . EVAPORATION Overall, the country experienced lower rates of evaporation during this January. The daily mean evaporation rate over the lowland areas ranged from 2.6mm/day (Muadzam Shah and Kuantan) to 5.2mm/day (Pulau Langkawi). The largest negative deviation was -1.1mm/day (Pulau Langkawi) while the largest positive deviation was +0.7mm/day (Batu Embun). The mean daily evaporation rate at Cameron Highlands was 1.8mm/day, with the deviation of -0.2mm/day.
Figures and tables:
Figure
1 : Rainfall Map for Peninsular Malaysia
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