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Monthly Weather Bulletin

SEPTEMBER 2014 

INTRODUCTION

Generally September is the final month for the southwest monsoon period. Usually at this time, weather conditions will gradually become humid. During September this year, states in Peninsular received normal rainfall distributions while most areas in Sabah and Sarawak experienced dry weather conditions with total rainfall amount below average values. Meanwhile temperature, solar radiation and evaporation rate records at Pricipal Meteorological Stations in Malaysia recorded higher readings compared to long term average for September.

RAINFALL

2. In general our Country experienced decreasing rainfall distributions down to 60% below average values during September compared to normal conditions. In the other hand, areas in western part of Pahang, northern part of Kedah and southern part of Perlis experienced increasing total rainfall amount more than 300 mm which up to 60% above average values. The other areas received normal rainfall distributions. Highest total rainfall amount was recorded at Butterworth Meteorological Station with readings of 490.8 mm. While the lowest total rainfall amount was recorded at Cameron Highlands Meteorological Station with readings of 433.4 mm. Meanwhile the lowest rainfall amount was recorded at Muadzam Shah Meteorological Station with readings of 61.6 mm.

3. Almost all Divisions in Sarawak experienced decreasing rainfall amount below average values. Dry weather conditions with total rainfall amount less than 60% below average was experienced in Miri, Bintulu, Limbang and Kapit Divisions. Other Divisions received normal rainfall distributions. Based on rainfall records at Meteorological Stations in Sarawak, the highest rainfall amount was recorded at Sibu Meteorological Station with readings of 313.2 mm while the lowest total rainfall amount was recorded at Miri Meteorological Station with readings of 96.0 mm.

4. Sabah also experienced minimum rainfall distributions especially in Interior Division which experienced dry weather conditions with total rainfall amount 60% below average values. Keningau Division recorded total rainfall amount less than 100 mm. In contrast, Tawau Division received rainfall distributions with total rainfall amount above average values more than 200 mm. Other Divisions received normal rainfall distributions. Based on rainfall records at Principal Meteorological Stations is Sabah and  Federal Territory of Labuan, the highest rainfall was recorded at Kota Kinabalu Meteorological Station with readings of 256.6 mm and the lowest total rainfall amount was recorded at Keningau Meteorological Station with readings of 42.8 mm.

5. The highest number of rain days were 23 days recorded at Cameron Highlands Meteorological Station for Peninsular area, 16 days at Kuching and Sibu Meteorological Stations in Sarawak and 16 days at Ranau Meteorological Station for Sabah and Federal Territory of Labuan. Meanwhile the lowest number of rain days were 8 days as recorded at Mersing Meteorological Station in Peninsular, 10 days at Miri Meteorological Station in Sarawak and 10 days at Tawau Meteorological Station in Sabah and Federal Territory of Labuan.

6. Based on classification scheme on rainfall decile values and percentage deviation from monthly average, it was determined that 1 station recorded total rainfall amount much above average, 6 stations above average, 16 stations similar to average, 9 stations below average and 4 stations much below average.

 

TEMPERATURE

7. Most of Principal Meteorological Stations nationwide recorded higher temperature reading compared to average values. Monthly mean temperature values at low land areas ranged from 24.1˚C as recorded at Ranau Meteorological Station to 28.3˚C as recorded at Labuan Meteorological Station. Largest positive deviation was +1.4°C as recorded at Mersing Meteorological Station. Monthly mean minimum temperature values ranged from 19.8˚C to 25.3˚C with lowest minimum temperature was 18.2°C as recorded at Ranau Meteorological Station. Meanwhile mean maximum temperature values ranged from 30.7˚C to 34.1˚C with highest maximum temperature was 35.7˚C as recorded at Temerloh and Sri Aman Meteorological Stations.

8. The one and only weather station at high land areas, Cameron Highlands Meteorological Station recorded  temperature readings ranged from 15.8˚C to 21.8˚C with average temperature of 18.0˚C.

 

SOLAR RADIATION

9. Mean daily solar radiation at low land areas ranged from 15.73 MJm-2 as recorded at Bayan Lepas Meteorological Station to 21.48 MJm-2 as recorded at Kota Bharu Meteorological Station. A total of 12 meteorological stations recorded higher solar radiation amount compared to normal. Mean solar radiation recorded at Cameron Highlands Meteorological Station was 13.30 MJm-2. Largest positive deviation from normal was +3.02 MJm-2 as recorded at KLIA Sepang Meteorological Station.

EVAPORATION

10. Mean daily evaporation rate for low land areas ranged from 2.9 mm/day as recorded at Kluang Meteorological Statios to 5.1 mm/day as recorded at Sandakan Meteorological Station. Largest positive deviation from normal was +1.0 mm/day recorded at Sitiawan Meteorological Station. Meanwhile, mean daily evaporation rate recorded at Cameron Highlands Meteorological Station was 1.8 mm/day.

 

Figures :

FIGURE 1 : Rainfall Map for Malaysia

FIGURE 2a : Mean Monthly Temperature

FIGURE 2b : Mean Monthly MaximumTemperature

FIGURE 2c : Mean Monthly MinimumTemperature

 

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