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MOnthly weather bulletin JUNE 2007 1. SUMMARY June falls within the Southwest monsoon. Climatologically, the weather condition of the country would be dry compared to the other month. About 90% of the country received average to much above average amount of rainfalls , however in Kota Bharu and Kuala Krai, in East Coast states recorded below average rainfall amount. The higher temperatures were recorded than the long term averages. The solar radiation rates and the evaporation rates were recorded slightly below normal. 2. RAINFALL Most of the central and north western regions of Peninsular Malaysia were wet and received much higher than average rainfall amount. However, some places in east coast of Peninsular Malaysia experienced long period of dry spells. It was noted that Petaling Jaya recorded 333.8mm of rainfall amount, the highest rainfall amount in record. In East Malaysia, Miri recorded rainfall amount at 648.8mm exceeding the current record 599.7mm in June 1959. Similarly, Kudat which recorded 231.2mm exceeding the current record 280.2mm in June 2005. On the 10th of June 2007, severe thunderstorms and heavy rains accompanied by strong winds occurred for about four hours in Kuala Lumpur, Putrajaya and Selangor (mainly in Klang Valley areas) during the late evening and night caused floods in Jalan Masjid India, Jalan Ipoh, Kampung Baru, Kampung Chubadak and Sentul. The areas surrounding Sultan Abdul Samad Complex and underground car park of the Merdeka Square were also submerged. The occurrence of continuous heavy rainfall over Miri in the early morning of 11th, also contributed significantly the rainfall amount for the month. This phenomenon associated with squall-lines developed offshore in the South China Sea. The number of rain days ranged from 7 days in Muadzam Shah to 21 days in Tanah Rata in Peninsular Malaysia; 19 days in Sri Aman to 25 days in Bintulu in Sarawak; and from 13 days in Sandakan to 24 days in Labuan in Sabah. This June, Pulau Langkawi recorded the highest monthly rainfall of 358.2mm whereas Kota Bharu recorded the lowest monthly rainfall of 51.0mm. Over East Malaysia, Miri recorded the highest monthly rainfall at 648.8mm while Sri Aman recorded the lowest monthly rainfall at 180.8mm in Sarawak. In Sabah, Labuan recorded the highest monthly rainfall at 616.0mm whereas Sandakan recorded the lowest monthly rainfall at 122.2mm. In Peninsular Malaysia, third day of the June, Cameron Highland registered the highest daily rainfall amount at 96.6mm. In Sarawak, Bintulu registered the highest daily rainfall amount at 59.4mm on 20th June; while in Sabah, Labuan registered the highest daily rainfall amount at 110.2mm on 15th June. 3. TEMPERATURE During this June, about 50% places in the country recorded normal temperature. The monthly mean temperature of lowland areas varied from 26.5°C as recorded at Kuching to 28.3°C as recorded at Kota Bharu. The largest positive deviation from normal was +0.9°C as recorded at Mersing and the largest negative deviation was -0.1°C as recorded at Kuala Krai and Tawau. The monthly mean minimum temperature of lowland areas ranged from 23.4°C at Kuching to 25.3°C at Pulau Langkawi. The lowest temperature of 21.5°C was recorded at Mersing. The monthly mean maximum temperatures of lowland areas ranged from 31.0°C at Labuan to 33.8°C at Muadzam Shah. The highest temperature of 36.1°C was recorded at Muadzam Shah. Cameron Highlands, the highland station, recorded temperature ranged between 15.0°C and 24.7°C, with the mean value of 18.5°C. 4. SOLAR RADIATION Generally, the country received below normal solar radiation. The mean daily solar radiation varied from 12.42MJm-2 recorded at Senai to 18.76MJm-2 at Kota Kinabalu. The largest positive and negative deviations from the mean were recorded at +2.08MJm-2 and –3.09MJm-2 in Subang and Senai respectively. Cameron Highland recorded the mean daily solar radiation at 12.92MJm-2 with the deviation of –1.46MJm-2. 5. EVAPORATION Overall, the evaporation rate over the country was much below normal. The mean daily evaporation rates at the lowland areas varied from 2.7mm/day as recorded at Mersing to 4.6mm/day at Kuala Terengganu and Melaka. The largest positive deviation was +1.1mm/day at Chuping and the negative deviation was -1.0mm/day at Miri. The mean daily evaporation rate at Cameron Highlands was 1.6mm/day, with the deviation of –0.4mm/day. . Figures and tables:
Figure
1 : Rainfall Map for Peninsular Malaysia
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