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Wellawaya
Wellawaya · Moneragala
Level 1 · WatchTue 10 Nov
Watch in Wellawaya
NBRI, issued Mon 9 Nov, 20:00 · valid to Tue 10 Nov, 20:00lankawatch.org
Rain hereAbout 3 days a month are this wet hereLast 24 hours · Satellite estimateNearest rain gaugeWellawayaReadings missing · 7 km awayRiversThanamalwila: Below Alertfalling
Next update usually today by 17:45.
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NBRI’s advice, as issued
×NBRI’s advice, as issued:Since the rainfall within the past 24 hours has exceeded 75mm, if the rain continues, be watchful on the possibility of landslides, slope failures, rock falls, cutting failures and ground subsidence.
NBRI, issued Mon 9 Nov, 20:00 · valid to Tue 10 Nov, 20:00
Rain here
×Rain here
Last 24 hours: Unusual here (3 days a month)
- Last 24 hours: among the wettest 10% of 24-hour periods since 2000 in Wellawaya.
- Compared with each division's own satellite record since 2000. This is not a warning and does not replace NBRI's levels. Satellites can miss heavy local downpours, so it never means a road is safe. Satellite data up to 10 Nov, 03:30.
Weather forecast (Department of Meteorology)
- No Department of Meteorology advisory is in force for Moneragala.
- Forecast issued 10 Nov, 05:30
- Showers or thundershowers will occur at times in the Northern province and in Trincomalee district.
- Showers or thundershowers will occur elsewhere in the island after 1.00 p.m.
- Covers Moneragala on this road: Heavy falls above 100mm are likely at some places in Western, Sabaragamuwa, Central and Uva provinces and in Galle and Matara districts.
- Showers may occur in the coastal areas of the Southern Province during the morning.
- The general public is kindly requested to take adequate precautions to minimize damage caused by temporary localized strong winds and lightning during thundershowers.
- Covers Moneragala on this road: Misty conditions can be expected at some places in Western, Sabaragamuwa, Central and Uva provinces and in Galle, Matara and Kurunegala districts during the early hours of the morning.
- A forecast never lowers or replaces the NBRI landslide warning above.
- Forecast and advisories by the Department of Meteorology, Sri Lanka, as issued. LankaWatch is not an official service.
Rain outlook (computer model) · Next day: Chance of a rare wet day
- Next day: a chance of a wet day of the kind that comes about 1–2 days a month in Wellawaya (the wettest 5% of days there; several times the usual chance). (10 Nov, 05:30 to 11 Nov, 05:30)
- Next 3 days: a chance of a wet day of the kind that comes about 1–2 days a month in Wellawaya (the wettest 5% of days there; several times the usual chance). (10 Nov, 05:30 to 13 Nov, 05:30)
- "Not signalled" never means dry or safe. This is a computer model, not a warning, and it never changes NBRI's levels. Like the satellite, it reads hill-country rain low and can miss heavy local downpours.
- ECMWF ensemble forecast (open data, CC BY 4.0), run 9 Nov, 17:30, compared with each division's own satellite record.
None of these changes NBRI’s level.
Weather forecast (Met Dept)
×- No Department of Meteorology advisory is in force for Moneragala.
- Forecast issued 10 Nov, 05:30
- Showers or thundershowers will occur at times in the Northern province and in Trincomalee district.
- Showers or thundershowers will occur elsewhere in the island after 1.00 p.m.
- Covers Moneragala on this road: Heavy falls above 100mm are likely at some places in Western, Sabaragamuwa, Central and Uva provinces and in Galle and Matara districts.
- Showers may occur in the coastal areas of the Southern Province during the morning.
- The general public is kindly requested to take adequate precautions to minimize damage caused by temporary localized strong winds and lightning during thundershowers.
- Covers Moneragala on this road: Misty conditions can be expected at some places in Western, Sabaragamuwa, Central and Uva provinces and in Galle, Matara and Kurunegala districts during the early hours of the morning.
- A forecast never lowers or replaces the NBRI landslide warning above.
- Forecast and advisories by the Department of Meteorology, Sri Lanka, as issued. LankaWatch is not an official service.
Rivers and catchments here
×8 named rivers here · 2 basins
River basins this division lies in
- Kirindi Oya basin
- Manik Ganga basin
Satellite rain over these basins
Rain over these basins in the last 7 days has not been unusual against each basin’s own record. That never means safe.
A whole-basin satellite average against that basin’s own record since 2000, not the area upstream of any one point. Satellites under-read hill rain. Not a warning.
Named rivers through this division
- Kirindi Oya · about 52 km inside
- Maha Ara (Kirindi Oya basin) · about 17 km inside
- Kuda Oya (Kirindi Oya basin) · about 14 km inside
- Debara Ara (Kirindi Oya basin) · about 9 km inside
- Dambakola Ara (Kirindi Oya basin) · about 8 km inside
- Pilhiyan Ara (Manik Ganga basin) · about 8 km inside
- Galamola Ara (Kirindi Oya basin) · about 6 km inside
- Pamandiya Ara (Manik Ganga basin) · about 5 km inside
Irrigation Department gauges on these rivers
- Thanamalwila, an Irrigation Department gauge in this division (696 km² upstream · rain over that area, Last 24 hours: Unusual here (3 days a month)): at least 5.7 mm in the 24 hours to 9 Nov, 08:30 (2 hourly readings missing); 0 mm in the 3 hours to 10 Nov, 08:07.
River level 2.06 m · Below Alert · falling over about 3 hours (Department’s thresholds: Alert 4, minor flood 5, major flood 5.5 m) - Wellawaya, an Irrigation Department gauge in this division (179 km² upstream · rain over that area, Last 3 days: Unusual here (3 days a month)): no complete 24-hour total (8 hourly readings missing); 0 mm in the 3 hours to 10 Nov, 08:02.
River level 1.67 m · Below Alert · falling over about 3 hours (Department’s thresholds: Alert 4.4, minor flood 5.4, major flood 5.9 m) - Kuda Oya, an Irrigation Department gauge in this division (299 km² upstream · rain over that area, Last 3 days: Unusual here (3 days a month)): 4.9 mm in the 24 hours to 9 Nov, 08:30 (Light); 0 mm in the 3 hours to 10 Nov, 08:01.
River level 1.89 m · Below Alert · falling over about 3 hours (Department’s thresholds: Alert 6.9, minor flood 8.4, major flood 8.8 m)
Rivers and basins come from our own map of Sri Lanka’s river network. Flow direction, where shown, is worked out from the height of the land. This is orientation only, not a flood warning.
The area draining to a crossing is worked out from a terrain model (about 90 m cells) and is approximate. The rain over it is the satellite average for that same area, against its own record since 2000. Areas under about 150 km² are smaller than the satellite can see, so they show no rain.
River levels are the Irrigation Department’s own readings at its gauge, against its own thresholds. This is not a flood warning: flood warnings come from the Irrigation Department and DMC.