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MOnthly weather bulletin NOVEMBER 2007 1. SUMMARY Generally, most parts of the country received normal to much below normal rainfall. The temperature recorded was higher than normal temperature. The country recorded below normal amount of solar radiation and experienced lower rate of evaporation. 2. RAINFALL During November 2007, most of the places in Malaysia particularly over east coast states of peninsular had recorded much below average amount of rainfall. This was due to the outbreak of strong monsoon surge from the Siberian High during the end of the month. The occurrences of weak sub-tropical ridge during the period had caused the trade wind to enter the Southeast Asian Region. The cold and dried monsoon surge from the Siberian High had dominant the wind path over the region before crossing the equator (cross-equatorial flow) towards the active monsoon trough in Southern Hemisphere. These had influenced the weather for most of the places over west of Southeast Asian region including Peninsular Malaysia. Based on the classification scheme, there were 20 stations recorded average rainfall, 2 stations recorded above average, 1 station recorded much above average, 4 stations recorded below average and 6 stations recorded much below average rainfall. The number of rain days for Peninsular Malaysia varied from 17 to 22 days while East Malaysia the recorded 14 to 24 days. For total monthly rainfall over Peninsular Malaysia, Kuala Terengganu recorded the highest total rainfall of 346.6 mm while Temerloh had the lowest (119.8 mm). In Sarawak, Kuching recorded the highest total rainfall (457.2 mm) while Sibu recorded the lowest amount (295.8 mm). In Sabah, Kota Kinabalu recorded the highest total rainfall (502.7 mm) while the lowest amount (163.4 mm) was recorded in Sandakan. For total daily rainfall, Kuala Terengganu Station recorded the highest amount (128.0 mm) in Peninsular Malaysia on the 10th. In Sarawak, the highest amount was 188.6 mm, recorded in Kuching on the 30th. In Sabah, the highest amount was 90.6 mm, recorded in Kota Kinabalu on the 17th. 3. TEMPERATURE The monthly mean temperature of lowland areas varied from 25.7°C in Kuala Krai to 27.2°C in Pulau Langkawi. The largest positive deviation from normal (+0.7°C) was recorded in Kluang. The monthly mean minimum temperature of lowland areas ranged from 22.9°C in Kuala Krai to 24.5°C in Pulau Langkawi. The lowest temperature of 21.0°C was recorded in Senai. The monthly mean maximum temperature of lowland areas ranged from 29.7°C in Kota Bharu to 32.1°C in Temerloh. The highest temperature was 35.5°C, recorded in Kluang. Temperature in Cameron Highlands ranged from 13.9°C to 24.0°C with a mean of 17.5°C. 4. SOLAR RADIATION The mean daily solar radiation varied from 11.45 MJm-2 in Senai to 17.15 MJm-2 in Subang. The largest positive and negative deviations were recorded in Subang (+2.69 MJm-2) and Kuching (-3.02 MJm-2) respectively.
5 . EVAPORATION The mean daily evaporation rates in lowland areas varied from 2.2 mm/day in Mersing to 4.4 mm/day in Sandakan. The largest positive and negative deviations from average were +0.7 mm/day in Kudat and -1.0 mm/day in Mersing respectively. The rate of evaporation in Cameron Highlands was 1.7 mm/day with a deviation of 0.1 mm/day.
Figure
1 : Rainfall Map for Peninsular Malaysia
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