Update, 11 October — the advisory has materialised. Strong winds and heavy rain damaged houses at Kiriyankalliya, in the Mundalama Divisional Secretariat division of Puttalam District, on Sunday afternoon, Hiru News reports — inside the North-Western Province and inside the advisory window. See The first damage report below.
The Department of Meteorology has issued an Amber Advisory for severe lightning, valid from Sunday until Monday, and says a low-pressure area is likely to form over the Southeast Bay of Bengal around 13 October, NewsFirst reported.
Where and what
Thundershowers with severe lightning are likely at several places in the Western, Sabaragamuwa, Central, Uva, North-western and Southern provinces, and in the Anuradhapura, Mannar and Vavuniya districts.
Fairly heavy falls above 75mm are likely at some places in the Western, Sabaragamuwa, Central, Uva and North-Western provinces and in the Galle, Matara, Anuradhapura and Mannar districts.
Temporarily strong gusty winds of 60-70 kmph can be expected during thundershowers. Misty conditions are likely at some places in the Western, Sabaragamuwa, Central and Uva provinces during the early hours of the morning.
At sea
Showers or thundershowers will occur at several places in the sea areas around the island. Winds will be north-easterly or variable at 20-30 kmph, and seas around the island will be slight as a baseline — but very rough conditions can be expected during thundershowers.
With the low-pressure area forecast for the Southeast Bay of Bengal, the department has asked naval and fishing communities to pay attention to its future forecasts and bulletins. The public has been asked to take adequate precautions against lightning and localised strong winds.
Context
This is the fourth severe-lightning advisory the department has issued in eleven days, after warnings on 1 October, 3 October and 8 October, the last of which coincided with spill gates opening at Deduru Oya.
Update: the first damage report
Severe winds with heavy downpours damaged several houses at Kiriyankalliya, a village in the Mundalama Divisional Secretariat division, on Sunday afternoon, Hiru News reported. Roofs and property were damaged, the outlet said, attributing the account to its correspondents.
This is the first confirmed impact from the advisory above, and it lands where the advisory said it would. Mundalama is in Puttalam District, in the North-Western Province — one of the five provinces flagged for both falls above 75mm and the temporarily strong gusty winds of 60-70 kmph. The timing matches too: the advisory took effect on Sunday, and the damage came that afternoon.
Hiru does not give a count of the houses affected, report any injuries, or say whether the Disaster Management Centre has assessed the damage or whether any households have been displaced. Nor does it record a wind speed, so there is no way to tell from the filing whether the gusts reached the 60-70 kmph the department forecast.
The report does not mention lightning, which is the hazard the Amber Advisory was issued for. On the account available, this was a wind-and-rain event within a lightning advisory rather than a lightning casualty — a distinction worth keeping, because the advisory’s headline risk remains untested.
Not reported
The filing does not say what the low-pressure area is expected to do after it forms, whether it is projected to intensify, or how it might affect Sri Lanka’s weather beyond the current advisory window. — answered on 12 October: see The low-pressure area now has a rainfall forecast attached below. It gives no rainfall or lightning-strike figures for the past 24 hours.
Update, 12 October: a fresh advisory, and the warning area has widened
The Department of Meteorology issued a new Amber advisory for severe lightning at 11.00 a.m. on Monday, valid until 1.00 a.m. on Tuesday (13), the Daily Mirror reported. This is a separate advisory from the one above, not an extension of it — it carries its own issue time and its own window.
Thundershowers with severe lightning are likely in the Western, Sabaragamuwa, Central, Uva, North-western, North-central, Eastern and Southern provinces, and in the Mannar and Vavuniya districts. Temporarily localised strong winds may again accompany the thundershowers.
The area has grown, and it has grown eastward
Comparing the two advisories is the useful thing here, because the department’s area list is where the change shows.
Sunday’s advisory covered six provinces — Western, Sabaragamuwa, Central, Uva, North-western and Southern — plus the Anuradhapura, Mannar and Vavuniya districts. Monday’s covers those same six provinces plus North-Central and Eastern, and names only Mannar and Vavuniya as districts.
Two things follow. Anuradhapura has not been dropped: it sits inside the North-Central Province, so a district-level warning has been upgraded to a whole-province one. And the Eastern Province is new to the list — Ampara, Batticaloa and Trincomalee were not covered on Sunday and are now. The warning area has expanded, and it has expanded towards the Bay of Bengal.
That direction matters given what this article reported on Sunday: the department expected a low-pressure area to form over the Southeast Bay of Bengal around 13 October, and Monday’s advisory runs to 1.00 a.m. on exactly that date. The eastward widening is consistent with that system approaching. No filing makes that link, and the Daily Mirror’s report does not mention the low-pressure area at all — so this is a sequence worth watching rather than a stated cause.
What this advisory drops
Monday’s advisory, as reported, is narrower in hazard detail than Sunday’s. There is no figure for fairly heavy falls above 75mm, no wind speed for the gusts, no sea-area forecast, and no instruction to naval and fishing communities — all of which Sunday’s carried. Whether the department omitted them or the Daily Mirror’s shorter filing did not carry them cannot be told from the report.
The filing also records no damage, injuries or lightning strikes from either advisory period, and does not refer back to the houses damaged at Kiriyankalliya on Sunday afternoon.
Sourcing note
This is the fifth severe-lightning advisory in twelve days, after 1, 3, 8 and 11 October. Only the Daily Mirror’s account of Monday’s advisory could be verified: NewsFirst and Hiru News had not filed on it at the time of writing, Ada Derana’s version is unfetchable behind its CloudFront block, and an Island filing surfaced in search with a different area list — naming Ampara and Batticaloa as individual districts rather than the Eastern Province as a whole — and carried no extractable publish date, so it is a different advisory or a different edition and is not cited.
Source: Daily Mirror.
The “no damage report” gap flagged here on 11 October was answered the same day by Hiru’s Mundalama filing. There is still no island-wide damage or casualty summary for the advisory period, and no figures from the Disaster Management Centre.
Update, 12 October: the low-pressure area now has a rainfall forecast attached
The Department of Meteorology has put figures to the system this article has been tracking since Sunday. Rainfall of up to 150 mm is expected in several provinces as the low-pressure area forms over the southeastern Bay of Bengal by 13 October, the Daily Mirror reported on Monday afternoon. NewsFirst carried the same warning under the heading “Brace for heavy rains from Oct. 13”.
Under the developing system’s influence, rainfall is expected to increase across the island and in the deep and shallow sea areas around Sri Lanka over the next few days, beginning Tuesday.
The specifics, as the department gave them:
- Showers or thundershowers in most parts of the island
- Heavy falls of 100 mm to 150 mm at some places in the Central, Sabaragamuwa, Uva and Southern provinces
- Fairly heavy falls above 75 mm at some places elsewhere in the country
- Misty conditions in the Sabaragamuwa, Central and Uva provinces in the early hours
The department has asked the public and naval and fishing communities to follow future forecasts and advisories on the developing system, and has repeated the warning to take precautions against localised strong winds and lightning during thundershowers.
This closes the question this article raised on Sunday
The gap flagged in Not reported above was precisely this: Sunday’s filing said a low-pressure area was expected around 13 October but did not say what it would do. Three points are now settled, and one is not.
Settled. The system is still on schedule — the department has not moved the 13 October date in two days. Its expected effect is now quantified rather than implied: 100–150 mm in four named provinces, above 75 mm elsewhere. And it is explicitly forecast to affect the sea areas as well as land, which is why the instruction to naval and fishing communities has returned after being absent from Monday morning’s shorter advisory.
Not settled. The department still has not said whether the low is projected to intensify after forming, which is the question that would determine whether this becomes a depression rather than a heavy-rain episode. Neither filing addresses it.
The eastward widening now reads differently
Monday morning’s advisory expanded the lightning-warning area eastward, and this article noted at the time that the link to the Bay of Bengal low was “a sequence worth watching rather than a stated cause” because no filing connected them.
That caution still stands — the afternoon filings do not refer back to the lightning advisory either. But the two now point the same way: the warning area moved toward the Bay of Bengal in the morning, and by the afternoon the department was forecasting island-wide rainfall from a Bay of Bengal system starting the next day. The heavy-fall provinces named in the afternoon forecast (Central, Sabaragamuwa, Uva, Southern) are four of the six that have appeared in every advisory in this sequence.
Note that the afternoon forecast’s heaviest-rain list does not include the Eastern and North-Central provinces that were newly added to Monday morning’s lightning advisory. Lightning risk and rainfall volume are being mapped differently, and no filing explains why.
