- The IRI weekly rainfall forecast predicts total rainfall up to 25 mm in most parts of the island during 5th – 10th Sep.
- Between 29 Aug – 4 Sep: up to 40 mm of daily rainfall was recorded in Batticaloa district on the 30th.
- From 26 Aug – 1 Sep: minimum temperature of 20 OC was recorded from Nuwara Eliya district while northeastern regions and southeastern coastal regions of the island recorded a maximum temperature between 35-40 OC.
- From 28 Aug – 3 Sep: up to 28 km/h, northwesterly winds were experienced by the entire island.
- 0.5 OC below average sea surface temperature was observed in the northwestern seas of Sri Lanka.
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Weekly Monitoring: On August 29th, several regions of Anuradhapura and Trincomalee districts received up to 5 mm of rainfall. On the 30th, Batticaloa district received up to 40 mm of rainfall; Trincomalee, Polonnaruwa, Ampara and Badulla districts up to 30 mm; and Mullaitivu, Vavuniya, Anuradhapura, Matale and Monaragala districts received up to 20 mm. On the 31st, Jaffna and Kilinochchi districts received up to 15 mm of rainfall; and Mannar, Mullaitivu, Vavuniya and Anuradhapura districts up to 10 mm. On September 1st, Jaffna and Kilinochchi districts received up to 5 mm of rainfall. On the 2nd, several regions of Galle, Matara and Ratnapura districts received up to 5 mm of rainfall. On the 3rd, Mannar, Vavuniya, Anuradhapura and Trincomalee districts received up to 10 mm of rainfall. On the 4th, Kandy and Badulla districts received up to 5 mm of rainfall.
Total Rainfall for past week : The RFE 2.0 tool shows total rainfall 25-50 mm of total rainfall in Anuradhapura, Polonnaruwa and Trincomalee districts; and up to 25-50 mm in Mullaitivu, Mannar, Vavuniya, Anuradhapura, Polonnaruwa, Batticaloa, Badulla, Monaragala and Ampara districts. Above average rainfall up to 10-25 mm is shown for Vavuniya, Anuradhapura and Trincomalee districts. Below average rainfall up to 50-100 mm is shown for Colombo and Ratnapura districts; and up to 25-50 mm in Puttalam, Kurunegala, Kandy, Nuwara Eliya, Badulla, Kegalla, Gampaha, Galle, Matara and Hambantota districts.
Monthly Monitoring: During August - above average rainfall conditions up to 180 mm were experienced by Nuwara Eliya district; and several regions of Polonnaruwa, Batticaloa, Ratnapura and Monaragala districts up to 60 mm. Rest of the island experienced below average rainfall up to 120 mm. The CPC Unified Precipitation Analysis tool shows up to 150 mm of total rainfall in Ratnapura, Nuwara Eliya, Matale, Ampara and Badulla districts; and up to 100 mm in Polonnaruwa, Kandy, Kegalla, Colombo and Matara districts.
NOAA NCEP Models:
From 5th – 11th Sep: Total rainfall between 15-25 mm in Matale, Kandy and Nuwara Eliya districts; and up to 15 mm in Badulla, Kegalla and Ratnapura districts.
From 12th – 18th Sep: Total rainfall between 15-25 mm in Matale. Kandy, Nuwara Eliya, Kegalla, Ratnapura and Badulla districts.IMD WRF Model Forecast:
7th Sep: No Rainfall.
8th Sep: No Rainfall.
IRI Weekly forecast:
From 5 - 10 Sep: Total rainfall up to 25 mm expected in most parts of the island.
Ocean State (Text Courtesy IRI)
PACIFIC SEAS STATE : August 20, 2018
In mid-August 2018, the east-central tropical Pacific waters reflected ENSO-neutral conditions, with near-average SST, slightly lower than a month ago. The key atmospheric variables also suggested neutral conditions, although westerly low-level wind anomalies have recently developed. The subsurface water temperature continued to be above-average. The official CPC/IRI outlook calls for neutral conditions through the rest of northern summer, with a 60% chance of El Niño development during fall, rising to 70% for winter 2018-19. An El Niño watch is in effect. The latest forecasts of statistical and dynamical models collectively favor weak El Niño development by early fall, growing to weak or possibly moderate strength during late fall and winter; most forecasters agree with this scenario.
INDIAN OCEAN STATE : 0.5 OC below average sea surface temperature was observed in the northeastern seas of Sri Lanka.