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Friday, May 29, 2020

Climate Bulletin for Sri Lanka (28 May 2020)

                                                      Highlights                             

       The NOAA weekly rainfall forecast predicts up to 100 mm of total rainfall in Galle and Matara districts during 28 May - 2 June. 

        Between 20- 26 May: up to 150 mm of rainfall was recorded in Colombo, Kalutara and Ratnapura districts on 26th

        From 12 May -  18 May: up to 18 km/h, northwesterly winds were experienced by the southern regions of the island.

        From 20 - 26 May: up to 18 km/h, northwesterly winds were experienced by the northern regions of the island.

        1 0C above-average sea surface temperature was observed in the seas around Sri Lanka.




Monitoring

Rainfall

Weekly Monitoring:


Date
Rainfall
20th May
Up to 15 mm in Kalutara and Ratnapura districts; up to 10 mm in Colombo, Kurunegala and Nuwara Eliya districts; and up to 5 mm in Gampaha, Kegalle, Kandy, Puttalam, Matara, Hambantota, Badulla, Monaragala and Anuradhapura districts.
21st   May
Up to 15 mm in Kegalle, Rathnapura and Colombo districts; up to 10 mm in Kandy, Nuwara Eliya, Matale, Gampaha, Kurunegala, Puttalam, Badulla, Kalutara, Galle and Matara districts; and up to 5 mm in Monaragala and Ampara districts.
22nd May
Up to 20 mm in Ratnapura, Kalutara and Galle districts, 15 mm in Galle district, up to 10 mm in Colombo, Puttalam, Badulla and Monaragala districts; and up to 5 mm in Kurunegala, Hambantota, Nuwara Eliya, Gampaha, Matale, Kandy and Ampara districts.
23rd May
Up to 40 mm in in Kilinochchi and Mullaitivu districts; up to 20 mm in Monaragala and Galle districts; up to 15 mm in Hambantota, Ratnapura, Badulla, Kandy and Nuwara Eliya districts; and up to 10 mm in Jaffna, Kurunegala, Kegalle, Matale, Colombo, Kalutara, Galle and Ampara districts.
24th May
Up to 50 mm in Monaragala district, up to 40 mm in Ratnapura, Kegalle, Colombo and Galle districts; up to 30 mm in Mannar, Vavuniya, Trincomalee, Polonnaruwa, Gampaha, Kalutara, Badulla and Hambantota districts; up to 20 mm in Galle district; and up to 15 mm in Kurunegala, Anuradhapura, Kandy, Mullaitivu and Mullaitivu districts.
25th May
Up to 70 mm in Vavuniya and Mullaitivu districts; up to 40 mm in Kilinochchi districts; up to 30 mm in Monaragala, Hambantota, Ampara, Badulla, Anuradhapura, Trincomalee, and Mannar districts; and up to 20 mm in Ratnapura, Galle, Nuwara Eliya and Kandy districts.
26th May
Up to 150 mm in Colombo, Ratnapura and Kalutara districts, up to 140 mm in Gampaha and Kegalle districts; up to 90 mm in Nuwara Eliya district; up to 70 mm in Kandy, Ampara, Monaragala and Matara districts; up to 60 mm in Galle district; up to 50 mm in Kurunegala and Hambantota districts; and up to 30 mm in Badulla and Puttalam districts.


Total Rainfall for the Past Week: 

The RFE 2.0 tool shows total up to 150-200 mm in Ratnapura, Kegalle, Gampaha and Colombo districts; up to 100-150 mm in Kalutara and Nuwara Eliya districts; 75-100 mm in Galle, Matara and Hambantota districts; up to 50-75 mm in Badulla, Monaragala, Kandy, Kurunegala, Ampara and Mullaitivu districts; and up to 25-50 mm in Kilinochchi, Vavuniya, Polonnaruwa, Puttalam and Matale districts. 
Above-average rainfall up to 100-200 mm in Ratnapura, Kegalle, Gampaha and Colombo and Kalutara districts; up to 50-100 mm in Mullaitivu and Nuwara Eliya districts; up to 25-50 mm in Kilinochchi, Vavuniya, Badulla, Monaragala, Ampara, Hambantota, Galle, Matara, Kandy and Kurunegala districts; and up to 10-25 mm in Polonnaruwa, Matale, Trincomalee and Puttalam districts. 

Monthly Monitoring
During April – Above average rainfall conditions up to 360 mm were experienced by Ratnapura, Badulla and Monaragala districts; up to 240 mm in Anuradhapura, Kegalle, Kandy and Matara districts; and up to 120 mm in Vavuniya, Matara, Nuwara Eliya, Colombo, Kalutara, Galle and Hambantota. Below-average rainfall conditions up to 240 mm were experienced by Jaffna, Kilinochchi, Mullaitivu and Gampaha districts; and up to 120 mm in Badulla, Polonnaruwa and Trincomalee districts. The CPC Unified Precipitation Analysis tool shows up to 750 mm of total rainfall in Kegalle, Ratnapura and Monaragala districts; and up to 500 mm in Anuradhapura, Kurunegala, Matale, Kandy, Nuwara Eliya, Colombo, Kalutara, Colombo, Galle and Matara districts. 

 Predictions


Rainfall


14-day prediction: 

NOAA NCEP models: 
From 28th May – 3rd June: Total rainfall up to 105 mm in Ratnapura, Kegalle and Colombo districts; up to 95 mm in Kalutara and Gampaha districts; up to 85 mm in Galle and Nuwara Eliya and Badulla districts; up to 75 mm in Kandy district, up to 65 mm in Kurunegala and Matale districts; and up to 55 mm in Hambantota, Monaragala, Anuradhapura and Puttalam districts.

From 4th – 10th June: Total rainfall up to 105 mm in Ratnapura and Kegalle and Colombo districts; up to 95 mm in Kalutara district; up to 85 mm in Gampaha and Nuwara Eliya and Galle districts; up to 75 mm in Kandy and Badulla districts; up to 65 mm in Kurunegala and Matale districts; and up to 55 mm in Anuradhapura, Polonnaruwa, Vavuniya, Mullaitivu, Mannar, Monaragala and Hambantota districts.


IRI Model Forecast: 
From 28th May – 2nd June: Total rainfall up to 100 mm in Galle and Matara districts; up to 75 mm in Kalutara, Rathnapura and Hambantota districts; up to 50 mm in Colombo, Gampaha, Kegalle, Kandy, Matale, Nuwara Eliya, Badulla, Monaragala, Ampara, Batticaloa, Polonnaruwa and Trincomalee and up to 25 mm in the other parts of the island. 

MJO based OLR predictions:
For the next 15 days: 
MJO shall suppress the rainfall in the next 15 days and shall enhance in the following 5 days.  


Ocean State (Text Courtesy IRI)

Pacific sea state: May 20, 2020
SSTs in the east-central Pacific were neutral, but above average during mid-May, and patterns in atmospheric variables are split between neutral and weak El NiƱo conditions. Most model forecasts favor warm neutral SST conditions continuing into summer, becoming below-average but not necessarily into La Nina territory by fall. The official CPC/IRI outlook is consistent with these model forecasts, calling for continuation of ENSO-neutral. 

Indian Ocean State
1 0C above-average sea surface temperature was observed in the seas around Sri Lanka.

Friday, May 22, 2020

Climate Bulletin for Sri Lanka (21 May 2020)

                                                      Highlights                             

        The NOAA weekly rainfall forecast predicts up to 50 mm of total rainfall in Gampaha, Colombo, Kalutara, Galle, Matara and Ratnapura districts during 13- 19 May.

        Between 13- 19 May: up to 100 mm of rainfall was recorded in Monaragala and Galle districts on 14th and 15th.

        From 12 May -  18 May: up to 18 km/h, northwesterly winds were experienced by the southern regions of the island.

        1 0C above-average sea the surface temperature was observed in the seas around Sri Lanka.

         MJO shall enhance the rainfall within the next five days and shall suppress gradually in the next 10 days



Monitoring

Rainfall

Weekly Monitoring:
Date
Rainfall
13th April
Up to 50 mm in Anuradhapura, Vavunia, Polonnaruwa, Kurunegala and Monaragala districts; up to 40 mm in Matale, Ratnapura and Gampaha districts; and up to 30 mm in Mannar, Ampara, Hambantota and Matara districts.
14th   April
Up to 100 mm in Monaragala district; up to 90 mm in Ampara district; up to 50 mm in Ratnapura district; up to 40 mm in Kalutara, Matara and Hambantota districts; and up to 30 mm in Anuradhapura and Vavuniya districts.
15th May
Up to 100 mm in Galle district; up to 90 mm in Kalutara, Anuradhapura and Vavuniya districts; up to 80 mm in Polonnaruwa, Trincomalee and Batticaloa districts, up to 70 mm in Matara and Ampara districts; up to 60 mm in Colombo and Ratnapura districts; up to 50 mm in Monaragala district; up to 40 mm in Gampaha, Kegalle, Kurunegala and Hambantota districts; and up to 30 mm in Mullaitivu, Puttalam, Kandy, Matale and Nuwara Eliya districts.
16th May
Up to 30 mm in all parts of the island.
17th May
Up to 60 mm in Kurunegala district; up to 50 mm in Trincomalee, Matale and Gampaha districts; up to 40 mm Anuradhapura, Polonnaruwa, Kegalle and Batticaloa districts; and up to 30 mm in Mannar, Vavuniya, Kalutara, Galle, Kandy, Ampara and Ratnapura districts.
18th May
Up to 30 mm in Ratnapura, Kalutara, Galle and Matara districts; and up to 20 mm in Nuwara Eliya, Anuradhapura, Vavuniya, Trincomalee, Mannar, Puttalam, Kalutara, and Kandy districts.
19th May
Up to 10 mm in Gampaha, Colombo, Kalutara, Galle, Matara, Kegalle, Nuwara Eliya, Ratnapura, Puttalam, Kurunegala, Kandy and Hambantota districts; and up to 5 mm in Monaragala, Badulla and Matale districts. 

Total Rainfall for the Past Week: 
The RFE 2.0 tool shows total up to 100-150 mm in Anuradhapura, Ratnapura, Vavuniya, Trincomalee, Polonnaruwa, Matale, Kalutara, Galle, Matara, Monaragala, Ampara, Gampaha and Batticaloa districts; up to 75-100 mm in Mullaitivu, Kurunegala, Colombo, Nuwara Eliya, Kandy, Badulla, and Hambantota, districts; and up to 50-75 mm in Jaffna, Kilinochchi and Puttalam districts. 
Above-average rainfall up to 100-200 mm in Anuradhapura, Vavuniya, Polonnaruwa and Trincomalee districts, up to 50-100 mm in Mullaitivu, Mannar, Puttalam, Kurunegala, Gampaha, Kalutara, Galle, Matara, Hambantota, Ratnapura, Badulla, Monaragala, Ampara, Batticaloa, Matale and Kandy districts; up to 25-50 mm in Kilinochchi and Colombo districts; up to 10-25 mm is shown in Jaffna district. 



Monthly Monitoring
During April – Above average rainfall conditions up to 360 mm were experienced by Ratnapura, Badulla and Monaragala districts; up to 240 mm in Anuradhapura, Kegalle, Kandy and Matara districts; and up to 120 mm in Vavuniya, Matara, Nuwara Eliya, Colombo, Kalutara, Galle and Hambantota. Below-average rainfall conditions up to 240 mm were experienced by Jaffna, Kilinochchi, Mullaitivu and Gampaha districts; and up to 120 mm in Badulla, Polonnaruwa and Trincomalee districts. The CPC Unified Precipitation Analysis tool shows up to 750 mm of total rainfall in Kegalle, Ratnapura and Monaragala districts; and up to 500 mm in Anuradhapura, Kurunegala, Matale, Kandy, Nuwara Eliya, Colombo, Kalutara, Colombo, Galle and Matara districts.

 Predictions


Rainfall


14-day prediction: 

NOAA NCEP models: 
From 21st - 27th May: Total rainfall up to 115 mm in Galle, Matara and Ratnapura districts; up to 105 mm in Kegalle district; up to 95 mm in Colombo and Nuwara Eliya and Badulla districts; up to 85 mm in Monaragala and Hambantota districts; up to 75 mm in Kandy district; and up to 65 mm in Matale and Kurunegala districts.

From 28th – 3rd May: Total rainfall up to 125 mm in Matara and Galle districts; up to 115 in Ratnapura district; up to 105 mm in Kegalle district; up to 95 mm in Hambantota and Colombo districts; up to 85 mm in Nuwara Eliya, Badulla and Monaragala districts; up to 75 mm in Kandy and Matale districts; and up to 65 mm in Anuradhapura, Polonnaruwa, Trincomalee, Vavuniya, Mannar, Mullaitivu, Kilinochchi and Jaffna districts. 

IRI Model Forecast: 
From 20th – 25th May: Total rainfall up to 50 mm in Gampaha, Colombo, Kalutara, Galle, Matara and Ratnapura districts; and up to 25 mm in the other parts of the island. 

MJO based OLR predictions:
For the next 15 days: 
MJO shall enhance the rainfall within the next five days and shall suppress gradually in the next 10 days. 


Ocean State (Text Courtesy IRI)

Pacific sea state: May 13, 2020
SSTs in the east-central Pacific were near above average in mid-May, and many of the atmospheric variables were mainly neutral. Most model forecasts favor neutral SST conditions continuing into summer, becoming below-average but not necessarily into La Nina territory by fall. The official CPC/IRI outlook is consistent with these model forecasts, calling for continuation of ENSO-neutral through fall.

Indian Ocean State
1 0C above-average sea surface temperature was observed in the seas around Sri Lanka.

Friday, May 15, 2020

Climate Bulletin for Sri Lanka (15 May 2020)

                                                      Highlights                             

          The NCEP GFS weekly rainfall forecast predicts up to 75 mm of total rainfall in southwestern regions of the island during 14- 19 May.
          Between 7 - 12 May: up to 180 mm of rainfall was recorded in Anuradhapura district on the 7th.
          From 6 - 12 May: up to 18 km/h, southeasterly winds were experienced by the southern regions of the island.
          1 0C above average sea surface temperature was observed in the seas around Sri Lanka.
          MJO shall enhance the rainfall in Sri Lanka in next 15 days.




Monitoring

Rainfall

Weekly Monitoring:

Date
Rainfall
7th   May
Up to 180 mm in Anuradhapura district; up to 100 mm in Vavuniya district; up to 70 mm in Mullaitivu, Trincomalee, Mannar, Matale and Ampara districts; up to 60 mm in Kandy, Nuwara Eliya, Badulla and Monaragala districts; up to 50 mm in Kilinochchi, Puttalam, Kurunegala and Polonnaruwa districts; up to 30 mm in Ratnapura and Matara districts; and up to 20 mm in Galle, Gampaha and Kegalle districts.
8th May
Up to 60 mm in Polonnaruwa district; up to 50 mm in Kurunegala, Matale, Kandy, Ampara, Badulla and Monaragala districts; up to 30 mm in Anuradhapura, Nuwara Eliya, Kegalle and Ratnapura districts; and up to 20 mm in Vavuniya, Trincomalee, Puttalam and Batticaloa districts.
9th May
Up to 100 mm in Badulla and Monaragala districts; up to 90 mm in Kilinochchi, Mannar, Mullaitivu, Vavuniya, Anuradhapura, Polonnaruwa, Matale and Ratnapura districts; up to 50 mm in Trincomalee, Kurunegala, Kegalle, Kandy and Nuwara Eliya districts; up to 30 mm in Puttalam, Gampaha, Kalutara, Galle, Matara and Hambantota districts; and up to 20 mm in Colombo, Jaffna and Batticaloa districts.
10th May
Up to 120 mm in Kurunegala and Kegalle districts; up to 100 mm in Vavuniya district; up to 90 mm in Mullaitivu, Mannar, Anuradhapura, Kandy, Matale, Nuwara Eliya and Ratnapura districts; up to 60 mm in Polonnaruwa, Ampara, Monaragala, Gampaha and Colombo districts; up to 50 mm in Puttalam, Kalutara and Badulla districts; up to 30 mm in Kilinochchi, Trincomalee, Batticaloa and Galle districts; and up to 20 mm in Matara district.
11th May
Up to 50 mm in Anuradhapura, Trincomalee, Polonnaruwa and Batticaloa districts; up to 30 mm in Matale, Kilinochchi and Mannar districts; and up to 20 mm in Jaffna, Mullaitivu, Vavuniya, Puttalam, Kurunegala, Gampaha, Colombo, Kalutara, Gampaha, Matara, Ratnapura, Hambantota and Ampara  districts.
12th May
Up to 170 mm in Ratnapura and Monaragala districts; up to 100 mm in Kandy, Kegalle, Nuwara Eliya and Badulla districts; up to 90 mm in Matara and Hambantota districts; up to 60 mm in Kalutara district; up to 50 mm in Kurunegala, Matara, Gampaha, Colombo and Galle  districts; up to 30 mm in Ampara districts; and up to 20 mm in Jaffna, Kilinochchi, Polonnaruwa, and Batticaloa districts.
13th May
Up to 50 mm in Vavuniya, Anuradhapura, Polonnaruwa, Matale, Gampaha, Kurunegala, Ratnapura and Monaragala districts; up to 30 mm in Mullaitivu, Mannar, Kalutara, Matara, Hambantota, Ampara and Kegalle districts; up to 20 mm in most parts of the island.

Total Rainfall for the Past Week: The RFE 2.0 tool shows total up to 200-300 mm in Anuradhapura, Vavuniya, Matara, Kegalle, Ratnapura and Monaragala districts; up to 150-200 mm in Mannar, Kurunegala, Kegalle, Nuwara Eliya, Kandy and Ampara districts; up to 100-150 mm in most parts of the island. Above-average rainfall up to 200-300 mm is shown for in Anuradhapura, Ratnapura and Monaragala districts; up and to 100-200 mm in Mannar, Mullaitivu, Vavuniya, Kurunegala, Kegalle, Matara, Kandy, Nuwara Eliya, Nuwara Eliya, Kegalle, Badulla, Polonnaruwa and Ampara districts; and up to 50-100 mm in rest of the island.


Monthly MonitoringDuring April – Above average rainfall conditions up to 360 mm were experienced by Ratnapura, Badulla and Monaragala districts; up to 240 mm in Anuradhapura, Kegalle, Kandy and Matara districts; and up to 120 mm in Vavuniya, Matara, Nuwara Eliya, Colombo, Kalutara, Galle, and Hambantota. Below-average rainfall conditions up to 240 mm were experienced by Jaffna, Kilinochchi, Mullaitivu and Gampaha districts; and up to 120 mm in Badulla, Polonnaruwa and Trincomalee districts. The CPC Unified Precipitation Analysis the tool shows up to 750 mm of total rainfall in Kegalle, Ratnapura, and Monaragala districts; and up to 500 mm in Anuradhapura, Kurunegala, Matale, Kandy, Nuwara Eliya, Colombo, Kalutara, Colombo, Galle and Matara districts.

 Predictions


Rainfall

14-day prediction: 

NOAA NCEP models: 

IMD NCMWRF Forecast:
From 14th - 20th May: Total rainfall up to 75 mm in Kurunegala and Kegalle districts; up to 65 mm in Matara, Kandy, Gampaha and Ratnapura districts; up to 55 mm in Puttalam, Anuradhapura, Nuwara Eliya, Colombo, Matara and Galle districts; and up to 45 mm in Badulla, Monaragala and Hambantota districts.
From 21st - 27th May: Total rainfall up to 95 mm in Galle and Matara districts; up to 85 mm in Ratnapura district; and up to 75 mm in Badulla, Monaragala, Kurunegala, Gampaha, Colombo and Kegalle districts.

IRI Model Forecast: 
From 14th – 19th May: Total rainfall up to 75 mm in Gampaha, Colombo, Kalutara, Gampaha, Kegalle and Ratnapura districts; and up to 50 mm in Puttalam, Kurunegala, Kandy, Nuwara Eliya, Badulla, Matara and Hambantota districts.
MJO based OLR predictions:

For the next 15 days: 
MJO shall enhance the rainfall in Sri Lanka.


Ocean State (Text Courtesy IRI)

Pacific sea state: May 14, 2020 
SSTs in the east-central Pacific were near-average in early May, and many of the atmospheric variables were either ENSO-neutral or leaning slightly in the cool-ENSO direction. Most model forecasts favor neutral SST conditions continuing into summer, becoming below-average but not necessarily into La Nina territory by fall. The official CPC/IRI outlook is consistent with these model forecasts, calling for a likely continuation of ENSO-neutral in summer, becoming cool-neutral by fall.

Indian Ocean State
1 0C above-average sea surface the temperature was observed in the seas around Sri Lanka.

Tuesday, May 12, 2020

Climate Bulletin for Sri Lanka (7 May 2020)

                                                      Highlights                             

          The NOAA weekly rainfall forecast predicts up to 100 mm of total rainfall in Badulla, Nuwara Eliya and Kandy districts during 4- 9 May.
          Between 29 Apr - 5 May: up to 140 mm of rainfall was recorded in Anuradhapura district on the 30th
          From 28 Apr -  4 May: up to 18 km/h, northwesterly winds were experienced by the southern regions of the island.
          1 0C above-average sea surface the temperature was observed in the seas around Sri Lanka.




Monitoring

Rainfall

Weekly Monitoring:

Date
Rainfall
29th April
Up to 70 mm in Ampara, Badulla and Monaragala districts; up to 60 mm in Matale, Kandy and Ratnapura districts; up to 30 mm in Kegalle and Nuwara Eliya districts; and up to 20 mm in Puttalam, Kalutara, Galle, Polonnaruwa and Batticaloa districts.
30th   April
Up to 140 mm in Anuradhapura district; up to 70 mm in Vavuniya district; up to 60 mm in Ratnapura, Galle, Monaragala and Hambantota districts; up to 50 mm in Mullaitivu, Mannar, Kalutara, Polonnaruwa and Badulla districts; up to 30 mm in Kilinochchi, Trincomalee, Kegalle, Kandy and Nuwara Eliya districts; and up to 20 mm in Puttalam, Matale, Gampaha and Colombo districts.
1st May
Up to 120 mm in Anuradhapura district; up to 70 mm in Trincomalee and Polonnaruwa districts; up to 50 mm in Vavuniya, Monaragala and Hambantota districts; up to 30 mm in Ratnapura and Badulla districts; and up to 20 mm in Mullaitivu and Mannar districts.
2nd May
Up to 20 mm in Hambantota district.
3rd May
Up to 60 mm in Ampara, Monaragala, Colombo, Ratnapura, Galle and Matara districts; up to 50 mm in Gampaha, Kurunegala, Nuwara Eliya, Kegalle, Kalutara and Ratnapura districts; up to 30 mm in Kandy district; and up to 20 mm in Hambantota and Batticaloa districts.
4th May
Up to 120 mm in Anuradhapura district; up to 100 mm in Vavuniya districts; up to 70 mm in Ratnapura, Badulla and Monaragala districts; up to 60 mm in Nuwara Eliya district; up to 50 mm in Kegalle and Mannar districts; up to 30 mm in Hambantota district; and up to 20 mm in Puttalam, Kurunegala, Matale, Kandy, Colombo, Kalutara and Matara districts.
5th May
Up to 50 mm in Mannar and Anuradhapura districts; up to 30 mm in Kilinochchi, Vavuniya, Kurunegala, Gampaha, Kegalle, Ratnapura and Monaragala districts; up to 20 mm in most parts of the island.

Total Rainfall for the Past Week: The RFE 2.0 tool shows total up to 200-300 mm in Anuradhapura district; up to 150-200 mm in Vavuniya and Monaragala districts; up to 100-150 mm in Kegalle, Nuwara Eliya, Ratnapura Badulla, and Ampara districts; and up to 75-100 mm in Mannar, Colombo, Galle and Hambantota districts. Above-average rainfall up to 200-300 mm is shown for in Anuradhapura district; up and to 100-200 mm in Vavuniya and Badulla districts; and up to 50-100 mm in Mannar, Kegalle, Ratnapura, Ampara, and Badulla districts. Below-average rainfall up to 10-25 mm is shown in Jaffna, Trincomalee and Batticaloa districts.


Monthly MonitoringDuring April – Above average rainfall conditions up to 360 mm were experienced by Ratnapura, Badulla and Monaragala districts; up to 240 mm in Anuradhapura, Kegalle, Kandy and Matara districts; and up to 120 mm in Vavuniya, Matara, Nuwara Eliya, Colombo, Kalutara, Galle, and Hambantota. Below average rainfall conditions up to 240 mm were experienced by Jaffna, Kilinochchi, Mullaitivu and Gampaha districts; and up to 120 mm in Badulla, Polonnaruwa and Trincomalee districts. The CPC Unified Precipitation Analysis tool shows up to 750 mm of total rainfall in Kegalle, Ratnapura, and Monaragala districts; and up to 500 mm in Anuradhapura, Kurunegala, Matale, Kandy, Nuwara Eliya, Colombo, Kalutara, Colombo, Galle and Matara  districts.

 Predictions


Rainfall

14-day prediction: 

NOAA NCEP models: 

IMD NCMWRF Forecast:
From 6th - 12th May: Total rainfall more than 135 mm in Galle and Matara districts; up to 125 mm in Ratnapura district; up to 115 mm in Monaragala district; and up to 105 mm in Gampaha, Badulla and Hambantota districts.
From 13th - 19th May: Total rainfall up to 95 mm in Galle and Matara districts; up to 85 mm in Ratnapura district; and up to 75 mm in Kurunegala, Gampaha, Colombo and Kegalle districts.

IRI Model Forecast: 
From 4th – 9th May: Total rainfall up to 100 mm in Badulla, Nuwara Eliya and Kandy districts; up to 75 mm in Matale, Kegalle, Ratnapura, Monaragala and Ampara districts; and up to 50 mm in Trincomalee, Batticaloa, Polonnaruwa, Hambantota, Matara, Galle, Kalutara, Colombo, Gampaha, Kurunegala and Anuradhapura districts.

MJO based OLR predictions:

For the next 15 days: 
MJO shall not have an impact on the rainfall in Sri Lanka.


Ocean State (Text Courtesy IRI)

Pacific sea state: April 20, 2020 

SSTs in the east-central Pacific were near the borderline of weak El NiƱo during mid-April. However, patterns in atmospheric variables were mainly neutral. Most model forecasts favor warm-neutral SST conditions during the rest of spring, cooling to average by summer. The official CPC/IRI outlook is consistent with these model forecasts, calling for a continuation of ENSO-neutral through fall.

Indian Ocean State
1 0C above-average sea surface the temperature was observed in the seas around Sri Lanka.