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Expect more thundery showers in the next fortnight

Singapore, 1 November 2016 – Singapore and the surrounding region are currently experiencing Inter-monsoon conditions which are expected to prevail during the first fortnight of November 2016. The Inter-monsoon period is characterised by an increase in the occurrence of showers, heavy at times, over Singapore, and winds that are mostly light and variable in direction.

2          For the first half of November 2016, short-duration thundery showers are expected on five or six days, mostly in the afternoon and could extend into the evening. In addition, widespread thundery showers accompanied by gusty winds are expected on three or four days between the predawn and early morning. November is climatologically the second wettest month of the year after December. In the first fortnight of November 2016, rainfall is expected to be slightly above normal.

3         In the coming fortnight, the maximum daily temperature on most days is forecast to be around 32°C or 33°C, and on a few days could reach a high of around 34°C.

4        For updates of the daily weather and haze forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), the haze microsite (www.haze.gov.sg) or download the myENV app, MSS’ Weather@SG app.

Review: 1 – 31 October 2016

5          Southwest Monsoon conditions prevailed in the region for most parts of October 2016, before transitioning to Inter-monsoon conditions in the last week of the month. In October 2016, the low level winds were mostly blowing from the southwest or west.

6          Compared with the first half of October 2016, Singapore experienced fewer warm days in the second half of the month due to more frequent rain showers in the region. The daily maximum temperature for October 2016 ranged between 29.3°C and 34.6°C. At the Changi climate station, the mean monthly temperature recorded for October 2016 was 28.4°C, which is 0.8°C warmer than the long-term mean for October.

7          In October 2016, thundery showers occurred mostly in the late morning and afternoon due to strong solar heating of land areas coupled with the convergence of winds over Singapore and the surrounding vicinity. On several days during the period, the occurrence of Sumatra squalls brought moderate to heavy thundery showers to many parts of Singapore in the pre-dawn hours and early morning. The heaviest daily rainfall of 96.8mm was recorded on 3 October 2016 around Buona Vista.

8         Most parts of Singapore received above normal rainfall in October 2016. The highest rainfall of 328mm (46% above average) was recorded around Boon Lay area. Rainfall was lowest around Upper Thomson where 188.8mm (11% below average) was recorded.

CLIMATE STATION STATISTICS FOR NOVEMBER (Climatological reference period: 1981 – 2010)

A few dry and warm days can still be expected

Singapore, 1 September 2016 – The region continues to experience Southwest Monsoon conditions. In the first fortnight of September 2016, the low level winds are forecast to blow predominantly from the southeast or southwest, and are expected to blow from the west on a few days.

2        Over the next two weeks, Singapore can expect five to seven days of short-duration thundery showers mostly in the late morning and afternoon due to strong solar heating of land areas coupled with wind convergence. In addition, thundery showers with occasional gusty winds can be expected on one or two days between the predawn hours and morning due to squall lines moving eastwards from the Strait of Malacca. The rainfall for the first fortnight of September 2016 is likely to be slightly above normal.

3        During the outlook period, dry and warm weather conditions can still be expected on a few days where the daily maximum temperatures could reach around 34°C. On most days, the daily maximum temperatures are forecast to range between 32°C and 33°C.

4        For updates of the daily weather and haze forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), the haze microsite (www.haze.gov.sg) or download the myENV app, MSS’ Weather@SG app.

REVIEW: 1 – 31 August 2016

5        In August 2016, Southwest Monsoon conditions prevailed over the region and the low level winds blew from the south or southwest on most days and from the west on a few days.

6        Singapore experienced a few warm days in the first half of August 2016. The highest daily maximum temperature recorded in August 2016 ranged between 29.1°C and 35.4°C. At the Changi climate station, the mean daily maximum temperature for August 2016 was 31.8°C, which is the highest mean daily maximum temperature recorded for August in the last ten years. In addition, the mean monthly temperature recorded was 28.9°C, approximately 1°C warmer than the long-term August mean temperature.

7        Compared to the first half of August 2016, Singapore experienced more rain days in the second half of the month. On 24 August 2016, a Sumatra squall brought heavy rainfall to many parts of Singapore. The heaviest rain that day fell over Jurong Island where a total of 69.2mm of rainfall was recorded. Most of the thundery showers in August 2016 fell in the late morning and early afternoon and were due to strong solar heating of land areas.

8        Rainfall for Singapore was below normal for August 2016. The highest rainfall of 213mm (4% above average) was recorded around the Choa Chu Kang area. Rainfall was lowest around Jurong West where 85.6mm (52% below average) was recorded.

CLIMATE STATION STATISTICS FOR SEPTEMBER (Climatological reference period: 1981 – 2010)

Significantly below normal rainfall expected for August 2016

Advisory

Singapore, 16 August 2016 –The prevailing Southwest Monsoon conditions will continue into the second half of August 2016 and the low level winds are forecast to blow mainly from the southeast or southwest.

2          For the rest of August 2016, short-duration thundery showers due to strong solar heating of land areas are likely on three or five days, mostly in the late morning and early afternoon. In addition, thundery showers with gusty winds due to Sumatra squalls are expected in the morning on one or two days. Rainfall for August 2016 is expected to be significantly below normal.

3          The current dry weather conditions experienced in recent days are expected to prevail in the second half of August 2016. In addition, a few warm days can be expected with the daily maximum temperatures forecast to range between 32°C and 33°C on most days and could reach around 34°C on a few days.

REVIEW (1 – 15 August 2016)

4          Southwest Monsoon conditions prevailed over the region in the first fortnight of August 2016, and the low level winds blew from the southeast or southwest.

5          Singapore experienced a few warm days during the review period. The highest daily maximum temperature was 35.4⁰C recorded in the northern part of Singapore on 10 August 2016. At the Changi climate station, the total rainfall recorded for the first half of August 2016 was 41.2mm, approximately 72% below the long-term mean of 148.9mm for August. In addition, the mean monthly temperature recorded during this period was 28.9°C, approximately 1°C warmer than the long-term August mean temperature.

6          During the first two weeks of the month, Singapore experienced dry weather conditions on most days. Thundery showers affected a few areas on some days mainly in the late morning and early afternoon. The heaviest rain fell over the Choa Chu Kang area on 11 August 2016 where a total of 65.6mm of rainfall was recorded. On 3 August 2016, a Sumatra squall that moved across Singapore in the predawn hours brought strong wind gusts of up to 86.1km/h around the West Coast areas.

7          Rainfall across Singapore was below normal in the first half of August 2016. The highest rainfall of 56mm (39% below average) was recorded around Serangoon. Rainfall was lowest around Jurong West where 4mm (95% below average) was recorded.

CLIMATE STATION STATISTICS FOR AUGUST (Climatological reference period: 1981 – 2010)

Thundery showers are still expected on some days

Advisory

Singapore, 1 August 2016 –  Southwest Monsoon conditions are forecast to persist in August 2016 with the low level winds blowing mostly from the southeast or southwest.

2          In the first fortnight of August 2016, short-duration thundery showers due to strong solar heating of land areas are forecast to occur in the late morning and early afternoon on four to five days. In addition, thundery showers with gusty winds due to Sumatra squalls are likely on one to two days in the pre-dawn and morning. Rainfall for the first fortnight of August 2016 is expected to be slightly below normal.

3          Compared to the weather conditions in the second half July 2016, the first fortnight of August 2016 is expected to be generally drier and warmer. The daily maximum temperatures for the next fortnight is forecast to range between 33°C and 34°C, and could reach around 35°C on a few days.

REVIEW (1 – 31 July 2016)

4          Southwest Monsoon conditions prevailed over the region in July 2016, with the low level winds blowing predominantly from the southeast or southwest.

5          Singapore experienced several warm days in the first half of July 2016, when the daily maximum temperatures ranged between 30.2°C and 36°C. With wetter weather in the second half of the month, it was a relatively cooler fortnight with the daily maximum temperatures ranging between 28.8°C and 34.7°C. At the Changi climate station, the mean monthly temperature recorded for July 2016 was 28.4°C, warmer than the long-term mean of 27.9°C for July.

6          Singapore experienced relatively wet conditions in July 2016 as a result of strong convergence of winds in the surrounding region as well as the passage of Sumatra squalls on several days. The heaviest rain fell on 21 July 2016 and brought a daily rainfall of 96.8mm to the East Coast area.

7          Almost all parts of Singapore received above normal rainfall in July 2016. The highest rainfall of 426mm (120% above average) was recorded over the western part of the island around Tengah. Rainfall was lowest around Buangkok where 146.6mm (16% below average) was recorded.

CLIMATE STATION STATISTICS FOR AUGUST (Climatological reference period: 1981 – 2010)

New record for highest 1-day total rainfall in June 2016 

Advisory

Singapore, 1 July 2016 –   The prevailing Southwest Monsoon conditions will continue in the first fortnight of July 2016, and the low level winds are expected to blow mainly from the southeast or southwest.

2          In the first half of July 2016, most of the thundery showers due to strong solar heating of land areas are forecast to occur in the late morning and early afternoon on 4 to 6 days. In addition, on one or two mornings, the passage of a Sumatra squall is expected to bring thundery showers with gusty winds to most parts of the island. The rainfall for the first fortnight of July 2016 is likely to be normal.

3          In the first fortnight of July 2016, some days of dry and warm weather conditions can be expected. On these days, the daily maximum temperature could reach a high of 35°C. For other days, the daily maximum temperature is forecast to range between 32°C and 34°C.

REVIEW (1 – 30 June 2016)

4          In June 2016, the region experienced Southwest Monsoon conditions with low level winds blowing predominantly from the south-southeast or southwest.

5          Singapore experienced a few warm days with low rainfall in the last week of June 2016. On 29 June 2016, the daily maximum temperature reached 35.70C, the highest temperature recorded for June 2016. Daily minimum temperatures of between 22.2°C and 22.5°C were recorded on a few days when there was widespread rain. At the Changi climate station, the mean monthly temperature recorded for June 2016 was 28.5°C, which is slightly warmer than the long-term mean of 28.3°C for June but cooler than the mean temperature of 29.0°C for June recorded in the last three years.

6          In the first three weeks of June 2016, most of the thundery showers which were due to strong solar heating of land areas coupled with the convergence of winds over Singapore occurred in the late morning and afternoon. On a few days during this period, the passage of Sumatra squalls brought moderate to heavy thundery showers to many parts of Singapore in the pre-dawn hours and morning. On 17 June 2016, the heavy thundery showers that fell over Tuas recorded a daily total rainfall of 217mm, the highest ever recorded for the month of June. The previous highest daily total rainfall record for June was 144.6mm on 4 June 2011 at Pasir Ris.

7       Most parts of Singapore received above average rainfall in June 2016. The highest rainfall of 374.2mm (126% above average) was recorded around Jurong. Rainfall was lowest around Admiralty where 116mm (19% below average) was recorded.

CLIMATE STATION STATISTICS FOR JULY (Climatological reference period: 1981 – 2010)

Near average rainfall expected for June

Advisory

Singapore, 16 June 2016 – The Southwest Monsoon conditions which set in during the first half of June 2016 are expected to persist into the second fortnight of June 2016. During this period, the low level winds are forecast to blow mainly from the southeast or southwest.

2          In the second half of June 2016, short-duration thundery showers can be expected mostly in the late morning and afternoon on five to seven days, due to strong day time convective heating and convergence of winds around Singapore and the surrounding vicinity. In addition, widespread thundery showers with occasional gusty winds due to Sumatra squalls, are likely in the predawn hours and morning on one to two days. The rainfall for June 2016 is likely to be near average.

3          During the outlook period, the daily maximum temperatures are forecast to range between 32°C and 33°C, reaching around 34°C on a few days. This is within the typical daily maximum temperature range for June.

REVIEW (1 – 15 June 2016)

4          Southwest Monsoon conditions prevailed in the region in the first fortnight of June 2016 with the low level winds blowing from the southeast or southwest.

5          During the review period, the highest daily maximum temperature recorded was 34.6°C over the north-eastern part of Singapore around the Seletar area. On days when there was rainfall, the lowest recorded daily minimum temperature fell to between 22°C and 23°C.  As of 15 June 2016, the mean monthly temperature recorded at the Changi climate station was 28.6°C, slightly warmer than the June long-term mean of 28.3°C.

6          Thundery showers in the late morning and early afternoon were experienced over Singapore on most days in the first two weeks of June 2016.  The showers were due to strong heating of land areas coupled with convergence of winds in the surrounding vicinity. The heaviest rain fell on 2 June 2016 and brought a total of 86.6mm of rainfall to the Seletar area.

7          Most parts of Singapore received above average rainfall in the first half of June 2016. The highest rainfall of 222mm (187% above average) was recorded around Seletar. Rainfall was lowest around Sentosa where 46.8mm (31% below average) was recorded.

CLIMATE STATION STATISTICS FOR JUNE (Climatological reference period: 1981 – 2010)