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MOnthly weather bulletin FEBRUARY 2008 1. SUMMARY The influence of Northeast Monsoon is tapering off during this month. Overall, Malaysia received average to very much above average amount of rainfall particularly over east coast part of Peninsular, Sabah and Sarawak. However, there were a few places in the northwestern part of Peninsular recorded below average amount of rainfall. 2. RAINFALL For February 2008, the cross equatorial drift coupled with the occurrence of mid-tropospheric trough in the early and middle of the month resulted in drier weather conditions in Peninsular Malaysia. From early February till middle of the month, most areas particularly over northwestern part of Peninsular Malaysia had experienced several long dry spells. However, the weakening northeasterly wind and the occurrence of the ‘Borneo low’ by end of February 2008 had caused the movement of the monsoon trough from south of equator to the north of equator. The existence of the monsoon trough over the region had caused several episodes of heavy rainfall and flashflood over inland areas of Pahang, Kelantan, Terengganu and Kedah during the period. Those events had contributed to the total monthly rainfall for the month. The total amounts of rainfall recorded in most places over Peninsular Malaysia were average to very much above average. The number of rain days ranged from 5 days in Pulau Langkawi to 13 days in Petaling Jaya in Peninsular Malaysia; 16 days in Miri to 25 days Sibu in Sarawak; and from 15 days in Tawau to 22 days in Kudat in Sabah. As for total monthly rainfall, Kuantan recorded the highest total rainfall of 402.0mm where as Pulau Langkawi recorded the lowest total rainfall of 31.4mm. Over East Malaysia, Bintulu recorded the highest total rainfall at 514.0mm while Miri recorded the lowest total rainfall at 252.6mm in Sarawak. In Sabah, Sandakan recorded the highest total rainfall at 872.0mm where as Tawau recorded the lowest total rainfall at 112.6mm. For total daily rainfall over Peninsular Malaysia, Kuantan registered the highest total rainfall amount at 218.6mm on 28th while Butterworth registered the lowest total rainfall amount at 18.4mm on 28th. In Sarawak, the highest amount was 87.6mm, recorded in Bintulu on the 28 th and the lowest amount was 52.0mm,recorded in Sibu on the 19th. In Sabah, the highest amount was 186.0mm, recorded in Sandakan on the 16th as the lowest amount was 42.0mm recorded in Kota Kinabalu on the 16th. 3. TEMPERATURE The mean temperature of the month over lowland areas varied from 25.1°C (Kuala Krai) to 28.5°C (Pulau Langkawi). Tawau recorded the largest positive deviation of +0.4°C from normal. The mean minimum temperature over lowland areas varied from 21.4°C (Kuala Krai) to 24.6°C (Pulau Langkawi). The lowest temperature of the month was 19.2°C recorded at Kuala Krai and Batu Embun. The mean maximum temperature over lowland areas varied from 28.7°C (Sandakan) to 34.0°C (Chuping). The highest temperature registered in the month was 36.1°C (Chuping). Cameron Highlands, the highland station, recorded temperature ranging from 13.7°C to 22.5°C with a mean temperature of 17.2°C. 4. SOLAR RADIATION The country generally received less of solar radiation. The daily mean values varied from 11.75 MJm² at Kuching to 21.75 MJm² at Bayan Lepas. The largest positive and negative deviations from normal were +2.55 MJm² and -3.80 MJm² at Subang and Senai respectively. Cameron Highlands recorded the mean daily solar radiation at 17.55MJm-2 with the deviation of 1.73MJm-2. 5 . EVAPORATION The country experienced lower rates of evaporation due to the decrease in the solar radiation. The daily mean evaporation rate over the lowland areas ranged from 2.8 mm/day (Sri Aman) to 6.0 mm/day (Alor Setar). The largest negative deviation was -1.3 mm/day (Pulau Langkawi) while the largest positive deviation was +0.6 mm/day (Kuala Terengganu). The mean daily evaporation rate at Cameron Highlands was 2.3 mm/day.
Figures and tables:
Figure
1 : Rainfall Map for Peninsular Malaysia
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