BIA Airport (Katunayake)
කටුනායක ගුවන්තොටුපළ · கட்டுநாயக்க விமான நிலையம்
BIA Airport (Katunayake) is in Katana DS division, Gampaha district
Today’s warning doesn’t mention Katana
Not listed doesn’t mean safe.
We don’t know about road closures or damage. Be cautious on the way, especially in the hills in rain.
About Katana
Katana is a Divisional Secretariat (DS) division in Gampaha district, Western Province.
It is inside the area NBRI’s landslide bulletins cover.
Towns on our road checks here: BIA Airport (Katunayake).
Named rivers here: Dondugam Oya (19 km), Krmbulapitiya Oya (11 km), Maha Oya (6 km), Madalam Oya (3 km), Kalu Oya (2 km).
River basins: Attanagala Oya, Maha Oya.
Past NBRI bulletins
None of the 41 NBRI bulletins we have passed on since Sun 20 Sept listed Katana.
A record of past bulletins, not a forecast. Not being listed doesn’t mean safe.
Wettest days on the satellite record
The wettest days here since June 2000, on NASA’s satellite rain estimate (IMERG): April 2003, May 2013, November 2000.
Months only, never amounts: the satellite’s amounts can be far off at any one place (too low in the hills). This is not a warning.
Roads through Katana
The fastest road between two of our towns, as on each road check.
- BIA Airport (Katunayake) – Negombo
- Colombo – BIA Airport (Katunayake)
- Colombo – Negombo
- Negombo – Chilaw
- BIA Airport (Katunayake) – Chilaw
- BIA Airport (Katunayake) – Avissawella
- BIA Airport (Katunayake) – Kalutara
- Avissawella – Negombo
- BIA Airport (Katunayake) – Kurunegala
- Kalutara – Negombo
- Kurunegala – Negombo
- BIA Airport (Katunayake) – Kegalle
and 251 more
Neighbouring DS divisions
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A small card with the current warning for BIA Airport (Katunayake), updated with each bulletin.
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Rain here
×Rain gauges near BIA Airport (Katunayake)
- Katunayake · about 2 km away
14.7 mm, Moderate rain
Rain in the 24 hours to Mon 9 Nov, 08:30, as published by Department of Meteorology · Irrigation Department · NBRI. Nearest first; Met gauge sites are approximate.
Rain here
Last 3 days: Not unusual
- Rain over the last 7 days has not been unusual for the divisions on this route.
- 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, 02:30.
Weather forecast (Department of Meteorology)
- No Department of Meteorology advisory is in force for Gampaha.
- 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 Gampaha 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 Gampaha 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: Not signalled
- Next day: unusually heavy rain is not signalled for the divisions on this road. (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 Katana (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 Gampaha.
- 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 Gampaha 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 Gampaha 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
×5 named rivers here · 2 basins
River basins this division lies in
- Attanagala Oya basin
- Maha Oya basin
Satellite rain over these basins
- Attanagala Oya basin · Last 3 days: Unusual here (3 days a month)
- Maha Oya basin · Last 3 days: Unusual here (3 days a month)
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
- Dondugam Oya (Attanagala Oya basin) · about 19 km inside
- Krmbulapitiya Oya (Attanagala Oya basin) · about 11 km inside
- Maha Oya · about 6 km inside
- Madalam Oya (Attanagala Oya basin) · about 3 km inside
- Kalu Oya (Attanagala Oya basin) · about 2 km inside
Irrigation Department gauges on these rivers
- Badalgama, an Irrigation Department gauge 17.1 km upstream (1,335 km² upstream · rain over that area, Last 3 days: Rare here (1–2 days a month)): 22.8 mm in the 24 hours to 9 Nov, 08:30 (Moderate); 0 mm in the 3 hours to 10 Nov, 08:05.
River level 4.13 m · Below Alert · rising over about 3 hours (Department’s thresholds: Alert 5, minor flood 6.2, major flood 9.6 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.