Highlights
• Heavy rainfall of 135 mm expected in
Eastern province during 20th – 26th Jan & dangerously heavy rainfall expected in Batticaloa during 27th Jan - 2nd Feb.
• Heavy rainfall was experienced in
Sabaragamuwa, Western, Eastern & Southern provinces.Up to 135 mm max in
Ratnapura on 16th Jan.
• From 12th -
18th
Jan: up
to 8 km/h Northeasterly winds were experienced
by the entire island
• Sea surface temperature was observed near-neutral all along around Sri Lanka.
Monitoring
Rainfall
Total Rainfall for the Past Week: The RFE 2.0 tool shows Cumulative rainfall by Districts:- 200 – 300 mm - Ratnapura, Kalutara, Galle
- 150 – 200 mm - Matara
- 100 – 150 mm - Kegalle, Kurunegala, Hambantota
- 75 – 100 mm - Colombo, Batticaloa
- 50 – 75 mm - Gampaha, Puttalam, Nuwara Eliya, Moneragala, Badulla,
Ampara, Kandy, Matale, Polonnaruwa
- 25 – 50 mm - Vavuniya, Mullaitivu, Anuradhapura, Trincomalee
- 10 – 25 mm - Jaffna, Kilinochchi, Mannar
Total rainfall Anomalies by DistrictsRainfall Excess- 200 – 300 mm - Kalutara
- 100 – 200 mm - Galle, Matara, Ratnapura, Kurunegala, Kegalle
- 50 – 100 mm - Hambantota, Badulla, Moneragala, Nuwara Eliya,
Colombo, Gampaha, Ampara, Batticaloa, Puttalam
- 25 – 50 mm - Matale, Kandy, Anuradhapura, Polonnaruwa, Trincomalee,
Vavuniya, Mannra, Mullaitivu
- 10 – 25 mm - Jaffna, Kilinochchi
Monthly Monitoring: Dekadal Rainfall by Districts:21st – 31st December:
Total Rainfall for the Past Week:
- 200 – 300 mm - Ratnapura, Kalutara, Galle
- 150 – 200 mm - Matara
- 100 – 150 mm - Kegalle, Kurunegala, Hambantota
- 75 – 100 mm - Colombo, Batticaloa
- 50 – 75 mm - Gampaha, Puttalam, Nuwara Eliya, Moneragala, Badulla, Ampara, Kandy, Matale, Polonnaruwa
- 25 – 50 mm - Vavuniya, Mullaitivu, Anuradhapura, Trincomalee
- 10 – 25 mm - Jaffna, Kilinochchi, Mannar
- 200 – 300 mm - Kalutara
- 100 – 200 mm - Galle, Matara, Ratnapura, Kurunegala, Kegalle
- 50 – 100 mm - Hambantota, Badulla, Moneragala, Nuwara Eliya, Colombo, Gampaha, Ampara, Batticaloa, Puttalam
- 25 – 50 mm - Matale, Kandy, Anuradhapura, Polonnaruwa, Trincomalee, Vavuniya, Mannra, Mullaitivu
- 10 – 25 mm - Jaffna, Kilinochchi
- 16 mm -Batticaloa,
Polonnaruwa, Colombo, Gampaha
- 14 mm - Ampara, Matale,
Trincomalee
- 12 mm - Anuradhapura, Kalutara, Badulla
- 10 mm - Vavuniya, Ratnapura, Galle, Matara
- 8 mm - Kegalle, Hambantota, Moneragala, Kandy, Kurunegala, Mannar, Mullaitivu
- 16 mm -Batticaloa, Polonnaruwa, Colombo, Gampaha
- 14 mm - Ampara, Matale, Trincomalee
- 12 mm - Anuradhapura, Kalutara, Badulla
- 10 mm - Vavuniya, Ratnapura, Galle, Matara
- 8 mm - Kegalle, Hambantota, Moneragala, Kandy, Kurunegala, Mannar, Mullaitivu
1st – 10th January:- 16 mm - Batticaloa, Polonnaruwa, Anuradhapura, Ampara, Matale, Trincomalee, Kandy, Kurunegala, Kegalle, Badulla, Moneragala, Vavuniya, Mannar, Gampaha
- 14 mm - Hambantota, Nuwara Eliya, Colombo, Puttalam, Mullaitivu
- 12 mm - Kalutara, Ratnapura, Galle
- 10 mm - Matara, Kilinochchi
- 8 mm - Jaffna
- 16 mm - Batticaloa, Polonnaruwa, Anuradhapura, Ampara, Matale, Trincomalee, Kandy, Kurunegala, Kegalle, Badulla, Moneragala, Vavuniya, Mannar, Gampaha
- 14 mm - Hambantota, Nuwara Eliya, Colombo, Puttalam, Mullaitivu
- 12 mm - Kalutara, Ratnapura, Galle
- 10 mm - Matara, Kilinochchi
- 8 mm - Jaffna
Predictions
Rainfall
14-day prediction:NOAA NCEP models:
From 20th – 26th January:
Total rainfall by Provinces:
135 mm - Eastern
55 mm - Northern
35 mm - North-central
15 mm - Western, Uva, Central
From 27th January – 2ndFebruary:
Total rainfall by Provinces:
140 mm - Eastern
105 mm - Northern
95 mm - North-central, Uva
75 mm - Central
65 mm - Western
55 mm - Sabaragamuwa, North-western, Southern
MJO based OLR predictions:
For the next 15 days:
MJO shall significantly suppress the rainfall during 19th
Jan– 2nd Feb.
Ocean State (Text Courtesy IRI)
Pacific sea state: January 13, 2021
Equatorial Eastern
Pacific SST reached La Niña threshold in mid-January and the atmospheric
variables were either ENSO-neutral or indicative of weak La Niña conditions.
Indian Ocean State
Sea surface temperature was observed near-neutral all along around Sri Lanka.
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