· The IRI weekly rainfall forecast predicts up to 150 mm of total rainfall in Colombo, Kalutara and Galle districts during 7 – 12 Aug.
· Between 31 Jul – 5 Aug: up to 50 mm of rainfalls were recorded in Trincomalee district on the 31st.
· From 30 Jul – 5 Aug: up to 54 km/h, westerly winds were experienced by the entire island.
Weekly Monitoring:On July 31th, Trincomalee district received up to 50 mm of rainfall; Anuradhapura and Batticaloa districts received up to 30 mm; and Mullaitivu, Vavuniya, Polonnaruwa, Monaragala and Hambantota districts up to 20 mm. On August 1st, Gampaha, Colombo, Kalutara, Galle, Kegalle, Ratnapura, Badulla and Monaragala districts received up to 5 mm of rainfall. On the 2nd, Galle and Matara districts received up to 5 mm of rainfall. No significant rainfalls were recorded in any part of the island during the 3rd. On the 4th, Ratnapura, Monaragala, Hambantota and Matara districts received up to 10 mm of rainfall. On the 5th, Ratnapura, Monaragala, Hambantota, Galle, Matara and Anuradhapura districts received up to 10 mm of rainfall; and up to 5 mm of rainfall in most parts of the island.
Total Rainfall for the Past Week: The RFE 2.0 tool shows total up to 50-75 mm in Trincomalee district; up to 25-50 mm in Badulla, Monaragala, Ampara and Hambantota districts; and up to 10-25 mm in Mullaitivu, Anuradhapura, Batticaloa, Colombo, Kalutara, Galle, Matara, Ratnapura and Nuwara Eliya districts. Above average rainfall up to 25-50 mm in Trincomalee, Monaragala and Ampara districts; and up to 10-25 mm in Anuradhapura, Badulla and Hambantota districts. Below average rainfall up to 10-25 mm is shown for Kalutara, Gampaha, Kegalle, Ratnapura, Kandy, Nuwara Eliya and Galle districts.
Monthly Monitoring: During July – Above average rainfall conditions up to 60 mm were experienced by Puttalam, Kurunegala. Kandy, Nuwara Eliya, Badulla, Monaragala, Ampara and Hambantota districts. Below average rainfall conditions up to 60 mm were experienced by Jaffna, Kilinochchi, Mullaitivu, Mannar, Vavuniya, Matale, Gampaha, Colombo, Kalutara, Galle and Batticaloa districts. The CPC Unified Precipitation Analysis tool shows up to 200 mm of total rainfall in Nuwara Eliya, Badulla and Ratnapura districts; up to 150 mm in Kalutara, Galle, Matara, Kegalle, Kandy and Monaragala districts; up to 100 mm in Puttalam, Kurunegala, Matale and Ampara districts; and up to 75 mm in Gampaha and Trincomalee districts.
NOAA NCEP models:
IRI Model Forecast:
MJO based OLR predictions:
For the next 15 days:
MJO shall enhance the rainfall in Sri Lanka in next 5 days and shall not have an impact on the following 10 days.