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JABATAN METEOROLOGI MALAYSIA

PUSAT IKLIM NASIONAL

BULETIN METEOROLOGI PERTANIAN 10 HARI

DEKAD KEDUA MEI 2021

(11hb – 20hb Mei 2021)

10 DAYS AGROMETEOROLOGICAL BULLETIN

SECOND DECADE OF MAY 2021

(11th – 20th May 2021)

PENDAHULUAN / INTRODUCTION Pada dekad kedua Mei (11hb – 20hb Mei 2021), Negara sedang mengalami fasa Monsun

Barat Daya yang telah bermula pada 19 Mei 2021 dan dijangka berterusan sehingga

pertengahan September 2021. Dalam tempoh ini, angin bertiup secara konsisten dari arah

barat daya dengan kelembapan udara yang lebih rendah dan keadaan atmosfera yang lebih

stabil menyebabkan kurangnya pembentukan awan yang menghasilkan hujan. Keadaan ini

menyebabkan taburan hujan yang rendah di seluruh Negara. Walau bagaimanapun, ribut

petir, hujan lebat dan angin kencang berikutan fenomena garis badai (squall line) masih

boleh berlaku terutama di pantai barat Semenanjung dan barat Sabah pada awal pagi.

In the second decade of May (11th – 20th May 2021), the country is in the Southwest

Monsoon phase which has started on 19 May 2021 and is expected to continue until

September 2021. During this period, wind is consistently blowing from the southwest with

lower air humidity which typically results in more stable atmospheric conditions resulting in

less cloud formation producing rain. This situation results in low rainfall distribution

throughout the country. However, thunderstorms, heavy rain and strong winds due to the

squall line phenomenon can still occur, especially on the west coast of the Peninsular and

west Sabah in the early morning.

HUJAN / RAINFALL Merujuk Rajah 1, secara umumnya kebanyakan kawasan di Semenanjung merekodkan

peratusan anomali hujan dari purata hingga 60 % di atas purata kecuali Jengka (Pahang)

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yang merekodkan peratusan anomali hujan 60 % di bawah purata. Di Sarawak, kebanyakan

kawasan merekodkan peratusan anomali hujan dari purata hingga 60 % di atas purata

kecuali Kuching yang merekodkan peratusan anomali hujan 20 – 40 % di bawah purata. Di

Sabah, kebanyakan kawasa merekodkan peratusan anomali hujan dari purata hingga 60 %

di atas purata kecuali Kudat yang merekodkan peratusan anomali hujan 20 % di bawah

purata.

Berdasarkan Rajah 2, terdapat enam (6) kawasan yang merekodkan bacaan jumlah hujan

melebihi 150mm iaitu Ipoh (189mm) di Perak, Melaka (189mm) di Melaka, Johor Bahru

(150mm) dan Stesen Pertanian Sungai Sudah (172mm) di Johor serta Petaling Jaya

(198mm) dan Subang (206mm) di Selangor yang merekodkan jumlah hujan tertinggi

dengan 7 hari pencerapan hujan. Kluang pula merekodkan jumlah hujan harian tertinggi

pada dekad ini dengan bacaan sebanyak 112.0 mm yang dicerap pada 12 haribulan.

Terdapat hanya satu (1) kawasan yang merekodkan jumlah hujan yang kurang iaitu di

Stesen P. P. P Tun Razak (8mm) di Pahang.

Di Sarawak, terdapat dua kawasan yang merekodkan bacaan jumlah hujan melebihi

120mm iaitu di Sibu (138mm) dan Bintulu (141mm) yang merekodkan jumlah hujan tertinggi

dengan 6 hari pencerapan hujan. Sri Aman merekodkan hujan harian tertinggi dengan

bacaan sebanyak 98.2 mm yang dicerap pada 12 haribulan.

Di Sabah, terdapat dua kawasan yang merekodkan bacaan jumlah hujan melebihi 150mm

iaitu di Kota Kinabalu (160mm) dan Labuan (253mm) yang merekodkan jumlah hujan

tertinggi dengan 9 hari pencerapan hujan. Kota Kinabalu merekodkan hujan harian tertinggi

dengan bacaan sebanyak 132.6 mm yang dicerap pada 19 haribulan.

Referring to Figure 1, in general, most areas in the Peninsula recorded a percentage of

rainfall anomalies from average to 60 % above average except Jengka (Pahang) which

recorded a percentage of rainfall anomalies 60 % below average. In Sarawak, most areas

recorded a percentage of rainfall anomalies from average to 60 % above average except

Kuching which recorded a percentage of rainfall anomalies 20 – 40 % below average. In

Sabah, most areas recorded a percentage of rainfall anomalies from average to 60 % above

average except Kudat which recorded a percentage of rainfall anomalies 20 % below

average.

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Based on Figure 2, there were six (6) areas that recorded rainfall readings exceeding

150mm, namely Ipoh (189mm) in Perak, Malacca (189mm) in Malacca, Johore Bahru

(150mm) and Pertanian Sungai Sudah Station (172mm) di Johore and also Petaling Jaya

(198mm) and Subang (206mm) which recorded the highest amount of rainfall with 7 days

of rain observation. Kluang, on the other hand, recorded the highest daily rainfall in this

decade with a reading of 112.0 mm which was observed on 12th. There were only one (1)

areas that recorded less rainfall, namely in P. P. P Tun Razak Station (8mm) in Pahang.

In Sarawak, there are two areas that recorded rainfall readings exceeding 120mm, namely

in Sibu (138mm) and Bintulu (141mm) which recorded the highest rainfall with 6 days of

rainfall observations. Sri Aman recorded the highest daily rainfall with a reading of 98.2 mm

observed on the 12th day of the month.

In Sabah, there are two areas that recorded rainfall readings exceeding 150mm, namely in

Kota Kinabalu (160mm) and Labuan (253mm) which recorded the highest rainfall with 9

days of rainfall observations. Kota Kinabalu recorded the highest daily rainfall with a reading

of 132.6 mm observed on the 19th of the month.

SUHU / TEMPERATURE Merujuk kepada Rajah 3 dan 4, kebanyakan kawasan tanah rendah menerima purata suhu

harian antara 26.8 ºC hingga 29.4 ºC. Pada dekad ini, bacaan suhu tertinggi direkodkan di

Stesen Haiwan Machang (Kelantan) dengan bacaan 35.7 ºC manakala bacaan suhu

terendah direkodkan di Stesen MARDI Pontian (Johor) dengan bacaan 22.1 ºC. Bagi

kawasan tanah tinggi pula, julat suhu purata telah direkodkan di antara 16.3 ºC hingga 23.8

ºC di Cameron Highlands.

Referring to Figure 3 and 4, most lowland areas received an average daily temperatures

ranging from 26.8 ºC to 29.4 ºC. In this decade, the highest temperature reading was

recorded in Haiwan Machang Station (Kelantan) with a reading of 35.7 ºC while the lowest

temperature reading was recorded at the MARDI Pontian Station (Johore) with a reading of

22.1 ºC. For the highlands, the average temperature range has been recorded between 16.3

ºC to 23.8 ºC in Cameron Highlands.

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SEJATAN / EVAPORATION Kebanyakan kawasan di Semenanjung secara umumnya merekodkan kadar purata sejatan

harian antara 3.0 mm hingga 4.5 mm di mana Chuping (Perlis) mencatatkan bacaan

tertinggi dengan bacaan sebanyak 5.8 mm manakala Muadzam Shah (Pahang)

mencatatkan bacaan terendah iaitu 2.4 mm. Manakala di Sabah dan Sarawak pula,

kebanyakan stesen merekodkan bacaan dari 3.5 mm hingga 4.5 mm di mana Sandakan

(Sabah) mencatatkan bacaan tertinggi dengan bacaan sebanyak 5.4 mm manakala Sri

Aman mencatatkan bacaan terendah iaitu 3.1 mm. Cameron Highlands pula telah

merekodkan purata bacaan sejatan 1.7 mm (Rujuk Rajah 5). Pada dekad ini, Chuping

merekodkan kadar purata sejatan harian dengan nilai sisihan purata tertinggi iaitu +2.2mm

manakala Bintulu mencatatkan bacaan nilai sisihan purata harian terendah iaitu -2.4mm.

Most areas in the Peninsula generally recorded an average daily evaporation rates ranging

from 3.0 mm to 4.5 mm where Chuping (Perlis) recorded the highest reading with a reading

of 5.8 mm while Muadzam Shah (Pahang) recorded the lowest reading with a reading of 2.4

mm. In Sabah and Sarawak, most stations recorded readings from 3.5 mm to 4.5 mm where

Sandakan (Sabah) recorded the highest reading with a reading of 5.4 mm while Sri Aman

recorded the lowest reading with a reading of 3.1 mm. Cameron Highlands recorded 1.7

mm an average evaporation reading (Refer to Figure 5). In this decade, Chuping recorded

an average daily evaporation rate with the highest average deviation value of +2.2mm while

Bintulu recorded the lowest daily average deviation value reading of -2.4mm.

SINARAN SOLAR / SOLAR RADIATION Pada dekad ini, kebanyakan tempat di Semenanjung merekodkan purata sinaran solar

harian antara 15.0 sehingga 19.0 MJm-2 di mana Kota Bharu (Kelantan) mencatatkan

bacaan tertinggi dengan bacaan sebanyak 21.1 MJm-2 manakala Johor Bahru mencatatkan

bacaan terendah iaitu 13.0 MJm-2. Bagi Sabah dan Sarawak pula, purata bacaan harian

direkodkan antara 17.0 MJm-2 hingga 19.0 MJm-2 di mana Kota Kinabalu mencatatkan

bacaan tertinggi sebanyak 20.2 MJm-2 manakala Kuching dan Tawau mencatatkan bacaan

terendah sebanyak 15.0 MJm-2. Bagi kawasan tanah tinggi, Cameron Highlands

mencatatkan bacaan sebanyak 14.6 MJm-2 (Rujuk Rajah 6).

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In this decade, most places in the Peninsula recorded average daily solar radiation between

15.0 to 19.0 MJm-2 where Kota Bharu (Kelantan) recorded the highest reading with a reading

of 21.1 MJm-2 while Johor Bahru recorded the lowest reading with a reading of 13.0 MJm-2.

For Sabah and Sarawak, the average daily reading was recorded between 17.0 MJm-2 to

19.0 MJm-2 where Kota Kinabalu recorded the highest reading of 20.2 MJm-2 while Kuching

and Tawau recorded the lowest reading of 15.0 MJm-2. For the highlands, Cameron

Highlands recorded a reading of 14.6 MJm-2 (Refer to Figure 6).

Rajah 1: Anomali Hujan

Figure 1: Rainfall Anomaly

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Rajah 2: Jumlah Hujan

Figure 2: Rainfall Amount

Rajah 3: Suhu Purata Minimum

Figure 3: Mean Minimum Temperature

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Rajah 4: Suhu Purata Maksimum

Figure 4: Mean Maximum Temperature

Rajah 5: Kadar Sejatan

Figure 5: Evaporation Rate

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Rajah 6: Sinaran Solar

Figure 6: Solar Radiation

Disediakan oleh / Prepared by: Pusat Iklim Nasional Jabatan Meteorologi Malaysia Jul-2021