Climate Bulletin For Sri Lanka (13 August 2021)

 

Highlights          

                   

  • Fairly heavy rainfalls are predicted in Western, Sabaragamuwa, North Central & Central provinces during 13th -17th  August.

  • Heavy rainfalls were experienced in the Central & Sabaragamuwa provinces with maximum of 133.5 mm in Kegalle district on 8th August.

  • From 3rd- 9th August: up to  15 km/h from the Southwesterly were experienced over the island.  

  • Sea surface temperature was observed above 0.5℃ around all of Sri Lanka.

Download full report ↓

---

Monitoring

Rainfall

Total Rainfall for the Past Week: 

The RFE 2.0 tool shows Cumulative rainfall by Districts:

• 100 -150 mm - Ampara, Badulla, Monaragala, Polonnaruwa, Batticaloa
• 50 -7 5 mm    - Kandy, Matale
• 25 -50 mm     - Colombo, Gampaha, Kegalle, Kurunegala, Nuwara Eliya, Puttalam
• 10 - 25 mm   - Anuradhapura, Galle, Kalutara, Kilinochchi, Mannar, Mullaitivu, Ratnapura, Trincomalee, Jaffna
• 5 – 10 mm    - Matara, Hambantota, Vavuniya

Weekly rainfall Anomalies by Districts:

Rainfall Excess

• 100 - 200 mm - Ampara, Badulla, Monaragala, Batticaloa
• 50 - 100 mm   - Matale, Polonnaruwa
• 25 - 50 mm    - Kandy, Nuwara Eliya
• 10 - 25 mm    - Anuradhapura, Colombo, Gampaha, Kegalle, Kilinochchi, Kurunegala, Mullaitivu, Puttalam, Ratnapura

Monthly Monitoring: 

Dekadal Rainfall by Districts:

21^st – 31^st July:

• 4 mm  - Ampara, Badulla, Batticaloa, Colombo, Gampaha, Kalutara, Kegalle, Monaragala, Ratnapura, Nuwara Eliya
• 2 mm - Anuradhapura, Galle, Hambantota, Kandy, Kurunegala, Mannar, Matale, Matara, Mullaitivu, Polonnaruwa, Puttalam, Trincomalee, Vavuniya

1^st – 10^th August:

• 14 mm - Ampara
• 12 mm - Badulla, Monaragala, Polonnaruwa
• 8 mm   - Batticaloa, Matale
• 6 mm   - Kandy
• 4 mm   - Colombo, Gampaha, Kegalle, Kurunegala, Nuwara Eliya, Puttalam, Ratnapura
• 2 mm   - Anuradhapura, Galle, Hambantota, Jaffna, Kalutara, Kilinochchi, Mannar, Matara, Mullaitivu, Trincomalee, Vavuniya

Predictions

Rainfall

14-day prediction: 
NOAA NCEP models: 

From 11^th – 17^th August: 

Total rainfall by Provinces

• 75 mm - Central, Sabaragamuwa, Western, North Central
• 65 mm - North Western, Southern
• 55 mm - Uva, Eastern, Northern

From 18^th – 24^th August: 

Total rainfall by Provinces:

• 75 mm - Sabaragamuwa, Western
• 65 mm - Central, North Central, Northern, North Western, Southern
• 45 mm - Uva, Eastern

MJO based OLR predictions:

For the next 15 days: 

MJO shall be active thus, slightly enhanced rainfall during 10^th – 24^th August. 

Ocean State (Text Courtesy IRI)

Pacific Sea Sate: August 4, 2021 

Equatorial SSTs were below average in parts of the eastern Pacific Ocean and near average across the rest of the Pacific Ocean in early August and most key atmospheric variables were ENSO –Neutral condition. A large majority of the model forecasts predict ENSO-neutral likely to continue through the Northern Hemisphere summer.

Indian Sea Sate

Sea surface temperature was observed above 0.5℃ around all of Sri Lanka.