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Monday, July 25, 2016

Hydro-meteorological Highlights ,25, July 2016

Highlights : During the previous week, the overall weather was dry except on 17th, 19th and 23rd. On the 17th 30 mm of rainfall was recorded in Passara and 20 mm of rainfall was received by the surrounding areas including Badulla town. On the 19th 20 mm of rainfall was received by Kahatagasdigiliya and Tammennawa areas in Anuradhapura district and 15 mm of rainfall was received by adjacent areas. Up to 15 mm of rainfall was recorded in Avissawella and Deraniyagala areas while less than 10 mm was received by Kalutara, Colombo , Nuawara Eliya and upper Ratnapura areas on 23rd. During the week from 17-23rd July, lowest temperature of 15-20 oC was recorded in Nuwara Eliya while maximum temperature of 25-40 oC was recorded in Eastern side of the country. 28-36 km/h north westerly wind was observed at the 850 mb level. Considerable rainfall is expected in the week from 25th-31st July. On 25th 70-140 mm of rainfall is expected in the western sea a few kilometers away from Colombo and Kalutara while up to 70 mm of rainfall is expected in the remaining parts of the western sea. On the same day up to 40 mm of rainfall is expected in Mulativu and 10-20 mm of rainfall is expected in the Eastern side of the country and Moneragala area. Heavy rainfall is expected in several areas of the country on 26th. On that day, 70-140 mm of rainfall is expected in western sea close to Gampaha and up to 70 mm of rainfall is expected in the western and south western coastal band including Chilaw, Colombo, Kalutara, Beruwala, Galle and the adjacent sea. On the same day, up to 70 mm rainfall is expected close to Balangoda and Nuwara Eliya and up to 40 mm of rainfall is expected in the adjacent areas as well as in Badulla and Moneragala. Very heavy rainfall is expected in western coastal band and the western sea on the 27th. Up to 140 mm rainfall is expected in the western sea close to Gampaha and Colombo and up to 70 mm rainfall is expected in the remaining part of the western sea and the western coastal band from Chilaw to Galle. Up to 40 mm of rainfall is expected close to Nuwara Eliya and Ratnapura and the sea adjacent to Mulaltivu and Trincomalee towns. From 28th-29th Up to 40 mm rainfall is expected in the western coastal towns including Chilaw, Colombo and Galle and the adjacent sea. The intensity of the rainfall is seen to be decreasing on the 30th. Up to 40 mm rainfall is expected in the sea close to Colombo and Kalutara while rainfall of less than 20 mm is expected in the rest of the western sea and the coastal belt. As usual, lowest temperature is expected in Nuwara Eliya to be around 15-20 oC and maximum temperature is expected in the eastern side of the island to be around 35-40 oC. 20-28 km/h westerly wind is expected in the lower half of the country at 850 mb level. 

Thursday, July 21, 2016

Weekly Hydro-meteorological Report, 21, July 2016


Highlights: Dry weather persisted in the country during 13th- 19th July and therefore the average rainfall deficit in the country has increased up to 60 mm. Heavy rainfall was only seen in Kantale/ Aralaganvila and Badulla areas. Above average rainfall was only received in Badulla region. Extreme rainfall was seen in the sea off the coast of Arugambay. Highest temperature was reported in the eastern side of the country while minimum temperature as usual was reported in Nuwara Eliya region. Reduced wind speed (only up to 20 km/h) was seen at the 700 mb level while up to 55 km/h wind was seen at the 850 mb level. NOAA NCEP and IRI CFS models does not expect much rainfall in the next two weeks but IMD WRF and GFS models predict heavy rainfall in Western and South-western regions in the next week. MJO is also expected to be present in the Indian ocean region which shall enhance rainfall condition in the country.
 
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Monday, July 18, 2016

Hydro-meteorological Highlights ,18, July 2016

Highlights : During the previous week, slight rainfall was seen in the south western region of the country in the first three days (from 9th-12th). Over the next few days rainfall had shifted towards the south eastern and eastern sides of the island. Maximum rainfall was recorded on 14th. On that day 50 mm of rain was received close to Arawa and 30 mm of rain was received in Badulla and adjacent areas. On 15th, 30 mm of rain was recorded in the Eastern region of Polonnaruwa. During the week from 10th-16th July, lowest temperature of 15-20 OC was recorded in Nuwara Eliya while maximum temperature was recorded in the Eastern side of the country to be between 35-40 OC. 10-15 m/s westerly wind was observed at the 850 mb level. No rainfall is expected for the period from 18th-24th except on 18th, 21st and 24th. On 18th, 20-40 mm of rainfall is expected in the western sea and on the 21st rainfall of 10-20 mm is expected close to Moneragala. On the 24th 20-40 mm of rainfall is expected in the western sea close to Colombo and Kalutara. For the period from 19th-25th, lowest temperature is expected in Nuwara Eliya while maximum temperature is expected in the Eastern region of the country to be between 35-40 OC.

Thursday, July 14, 2016

Weekly Hydro-meteorological Report, 14, July 2016


Highlights: Mostly less than 10 mm rainfall was seen in the country in the period from 6th-8th. However, on the 9th, 70 mm of rainfall was recorded in Puttalam and considerable rainfall was seen in Alawwa, Nttambuwa and adjoining areas. Within the week from 6th-11th, highest temperature of 35-40 0C was recorded in the Eastern part of the country while the minimum temperature was recorded in Nuwara Eliya. High wind speed of 15-20 m/s was recorded in the central region of the island. Heavy rainfall is expected in the sea close to Kalutara in the coming week from 14th-20th. Up to 70mm of rainfall is expected in Beruwala and Kalutara areas. The rest of the western province as a whole will experience up to 40mm of rainfall. Ratnapura and Gampaha districts too shall experience rainfall in the coming week. The wind speed will remain at 10-15 m/s.  MJO shall be in the Indian Ocean and therefore it shall enhance rainfall condition in Sri Lanka.
 
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Thursday, July 7, 2016

Weekly Hydro-meteorological Report, 7, July 2016

Highlights: Dry conditions were mostly seen throughout the county in the previous week. The only recorded rainfall in the week was on the 29th June which was less than 10 mm in south-western and central regions of the country. In June 2016 the entire country received less than average rainfall with the south-western region of the country receiving 20- 50% below normal and the rest of the country receiving more than 75% below normal rainfall. Due to this, the average rainfall deficit in the entire country has increase up to 30 mm by the 5th July. Rainfall is only expected in the south western region of the country during the next week and extreme rainfall events are not expected. Strong wind is expected in the southern half of the country and the highest temperature is expected in the eastern and north-eastern regions of the country. MJO is weak.
 


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Thursday, June 30, 2016

Weekly Hydro-meteorological Report, 30, June 2016

Highlights: The entire country received low rainfall during the previous week except the sea adjacent to North Eastern side of the island.  During the previous week maximum temperature of 35-40 0C was seen along the eastern coastal belt while the minimum temperature of 200 C was recorded in Nuwara Eliya. NOAA NCEP models predict up to 55mm total rainfall in the Ratnapura town in the next week while Colombo may experience up to 45mm rainfall. NOAA CPC GFS model predicts 35- 40 0C maximum temperature along the coastal region in the eastern side of the island. Wind speed is expected to remain at 15m/s throughout the country and the surrounding sea. MJO shall enhance rainfall conditions up to 5 days ahead and thereafter shall suppress.
 


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Thursday, June 23, 2016

Weekly Hydro-meteorological Report, 23, June 2016

Highlights: The entire country received below average rainfall during the previous week except the south-western region of the country. During the previous week maximum temperature of 35-400C was seen along the eastern coastal belt while the minimum temperature of 200 C was recorded in NuwaraEliya.NOAA NCEP models predict up to 55mm total rainfall in the western province in the next week while other regions shall have up to 45mm rainfall. NOAA CPC GFS model predicts 35- 40 0C maximum temperature along the coastal region in the eastern side of the island.Higher wind speed (up to 20 m/s) is expected throughout the country and the surrounding sea. MJO shall enhance rainfall conditions up to 10 days ahead and thereafter shall suppress. ENSO is neutral and therefore the impact on the rainfall is minimal. La Nina conditions are expected to develop by late June which shall slightly enhance rainfall in the country during July and August.



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