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MOnthly weather bulletin OCTOBER 2007 1. SUMMARY In general, 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 lower than average amounts of daily solar radiation and experienced lower rates of evaporation. 2. RAINFALL October is an inter-monsoon month. During this month, heavy rains were noted in several areas over northern part of Peninsular Malaysia and west of Johor. The recorded total amount of rainfall was average to much above average. Few episodes of flooding had struck these areas (lower areas of west coast of Johor and Northwestern of Peninsular Malaysia) on the 13th, 22nd, 23rd and 26th of October. This wet weather was influenced by stronger convective activities due to the weak and variables wind, higher than usual surface temperature, high moisture content and unstable atmosphere condition during the period. Besides that, the occurrences of tropical storm activities (Lekima, Krosa, Haiyan, Podul, Lingling, Kajiki and Faxai) in the Pacific Ocean and the north of South China Sea had also influenced the weather for the country particularly Sabah and Sarawak. As for total monthly rainfall, Kuantan recorded the highest total rainfall of 520.2 mm where as Mersing recorded the lowest total rainfall of 92.6 mm. Over East Malaysia, Sandakan recorded the highest total rainfall of 428.8 mm while Tawau recorded the lowest total rainfall of 153.6 mm. Based on the classification scheme, there were 5 stations recorded very much above average rainfall, 3 stations recorded above average and 22 stations recorded average rainfall. Meanwhile, there were 2 stations recorded below average rainfall and 1 station recorded much below average rainfall. It was noted that Kuching had its highest daily rainfall on record of 195.4 mm on 31st of October. The number of rainy days for Peninsula Malaysia ranged from 13 to 28 days while the East Malaysia ranged from 14 to 25 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 26.1°C to 27.9°C as recorded at Labuan and Senai respectively. Kuantan recorded the largest positive deviation of +0.7°C from normal. The mean minimum temperature over lowland areas varied from 22.9°C (Kuala Krai) and 24.9°C (Labuan). The lowest temperature of the month was 21.7°C being recorded at Kluang. The mean maximum temperature over lowland areas varied from 30.1°C (Butterworth) to 32.8°C (Kluang) The highest temperature registered in the month was 36.3°C, in Kluang. Cameron Highlands, a highland station, had temperature ranging from 13.9°C to 23.9°C with a mean temperature of 17.6°C. 4. SOLAR RADIATION The country generally received below average amount of solar radiation. The daily mean values varied from 12.64MJm-2 at Senai to 19.78MJm-2 at Miri. The largest positive and negative deviations from normal were +3.75MJm-2 and -2.35MJm-2 at Miri and Senai respectively. Cameron Highlands recorded the mean daily solar radiation at 11.29MJm-2 with the deviation of -0.88MJm-2 .
5 . EVAPORATION
Overall, the country experienced lower rates of evaporation during this October. The daily mean evaporation rate over the lowland areas ranged from 2.6mm/day (Kuala Krai) to 5.0mm/day (Sandakan). The largest negative deviation was -0.7mm/day (Pulau Langkawi and Mersing) while the largest positive deviation was +0.7mm/day (Sandakan). The mean daily evaporation rate at Cameron Highlands was 2.0mm/day, with the deviation of +0.4mm/day.
Figure
1 : Rainfall Map for Peninsular Malaysia
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