El Nino Watch
One Thailand-wide picture of floods and storms: declared disaster areas, reported incidents, measured heavy rain and river levels in all 77 provinces.
Data and trust
A national summary rebuilt every few minutes from data the app already collects: incidents reported in the news and social posts (with their links), ThaiWater rain gauges and river / canal stations in every province, DDPM official posts and TMD warning bulletins. Each province gets a level 0-3 with the reasons listed; the country gets a level 0-4.
Limits. News-derived incidents are reports, not measurements: a place can be missed if no outlet names it, and a headline can be misread by the keyword matching. Rain and river readings come from automatic stations that sometimes fail. Always read the linked sources before acting.
Province: 3 Act = disaster area declared (DDPM, or reported by 2+ independent outlets) or evacuations / deaths / disaster zone reported by 2+ outlets. 2 Prepare = one such report, flooding reported by 2+ outlets, very heavy rain (> 90 mm in 24 h) or a river over its bank. 1 Watch = any other report, heavy rain (35.1 mm or more) or a river near its bank (80 %+). National level = the worst province; 4 only when disaster areas are declared in 3+ provinces and 10+ provinces are at level 3. An active TMD heavy-rain or storm bulletin alone gives 1.
Floods on the mainland rarely touch the island directly, but they cut the routes you would use to leave or to be supplied: Bangkok airports, the southern railway and highway, the Surat Thani / Donsak side of the ferries. See "National vs Samui".