Highlights

Rainfall Prediction: Heavy rainfall is predicted for the Western and Sabaragamuwa provinces and Galle and Matara districts. The rest of the country is expected to have less rainfall during 16th-21st June

Monitored Rainfalls: During the last week, the average daily rainfall over Sri Lanka was 1.4mm and hydro catchment areas have received 2.9mm on average.

Monitored  Wind: From 6th- 12thJune, up to 15 m/s of south-westerly winds were experienced over the island

Monitored  Temperature: Sea surface temperature was observed to be above average of0.5°C to the east and south of the island. Land surface temperature remained near normal

Interpretation

Monitoring

Rainfall: During the last two weeks, there had been very heavy rainfall over the following area: Kalutara
Daily Average Rainfall in the Met stations for previous week of (6th- 13th June) = 1.4 mm

Maximum rainfall: 37.4 mm & minimum rainfall: 0.0 mm.

Wind: South-westerly prevailed in the sea area surrounding the island last week.

Temperatures: The temperature anomalies were near-normal for the entire island, driven by the warm SST’s

Prediction

Rainfall: During the next week (17th- 21st June) heavy rainfall (>100 mm) is predicted for the Western and Sabaragamuwa provinces and Galle and Matara districts. The rest of the country is expected to have less rainfall.
Temperatures: The temperature remains above normal in the Uva and Eastern province and slightly below normal in the central province during 16th – 22nd June.

Teleconnections:

La Niña – Though La Niña is favored to continue, the odds for La Niña decrease into the late Northern Hemisphere summer (August-October 2022).

MJO shall slightly enhance the rainfall during 15th – 19th June; and near neutral during 20th – 29th June.

Seasonal Precipitation: The precipitation forecast for the July-August-September season shows above-normal precipitation for the north of the country.

Terminology for Rainfall Ranges