# BKK Rain

> พยากรณ์ฝนรายจุดและรายเขตสำหรับกรุงเทพฯ ทั้ง 50 เขต บอกว่าฝนจะถึงจุดของคุณในกี่นาที หนักแค่ไหน พร้อมความมั่นใจของระบบทุกครั้ง
> Street- and district-level rain nowcasts for Bangkok's 50 districts, always with an explicit confidence.

BKK Rain is a free, non-commercial public web app (a PWA at https://bkkrain.com/app/). It answers one question for a place the user saves (home, work, a child's school): will it rain here, in how many minutes, how hard, and for how long. It is not a city-wide weather overview.

Bangkok's evening rain (17:00–19:00) is mostly convection that forms locally, so the product works in two honest tiers:
1. A morning outlook of the evening's rain chance per district group (probabilistic, from atmospheric instability, weather-model ensembles and Bangkok's daily rain cycle).
2. A minute-level nowcast only once rain starts to form (typically 30–90 minutes ahead), from satellite, station and radar signals.

It does NOT claim minute-precise forecasts hours ahead, and it does not predict flooding depth for a street; flood-risk badges come from official risk points and live road-flood sensors.

## Key pages

- [หน้าแรก / Landing](https://bkkrain.com/): what the app does, data sources, FAQ (Thai)
- [เปิดแอป / The app](https://bkkrain.com/app/): not indexable; per-device alerts (coming soon), no account
- [Full context for LLMs](https://bkkrain.com/llms-full.txt): sources, licences, method summary

## Data sources (attribution required)

- สำนักการระบายน้ำ กทม. (Bangkok Metropolitan Administration, Drainage and Sewerage Dept.): road flood sensors; rain radar via the Thai Meteorological Department's mirror. Non-commercial; radar is real-time and not quality-controlled.
- กรมอุตุนิยมวิทยา (Thai Meteorological Department): warnings, observations, weather models
- คลังข้อมูลน้ำแห่งชาติ (สสน.) (National Hydroinformatics Data Center): hourly rain gauges, CC BY-NC
- GISTDA: satellite flood extents, per its Open API terms
- Open-Meteo: weather model data, CC BY 4.0, "Weather data by Open-Meteo.com"
- Traffy Fondue: citizen flood reports, always labelled as such
- data.bangkok.go.th: flood-risk points, CC BY

## API

- [Health and version](https://api.bkkrain.com/v1/health): service status, app version, schema version
- The read API (`/v1/districts`, `/v1/events`, `/v1/radar`) serves the app; it is not indexed (robots: Disallow) and has no stability guarantee for third parties.