dataset · Wales

Historic Flood Warnings and Flood Alerts

These datasets show all messages issued for flooding from rivers or the sea in Wales since 2006. There are three flood warning codes: Flood Alert - flooding is possible; be prepared (replaced Flood Watch in 2010) Flood Warning - flooding is expected; take immediate action Severe Flood Warning - severe flooding is expected; danger to life Environment Agency Wales provided data up until 1 April 2013. Since then, it has been provided by Natural Resources Wales. The data is split across two Excel fi

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Source details

Licence: ["There are no access restrictions on this data. NRW may release, publish or disseminate it freely.", "\u00a9 CNC/NRW. Data may be re-used under the terms of the Open Government Licence providing it i

Evidence quality: 54.4

Listed in data.gov.uk public catalogue API on 2026-10-16; relevance/value screened (haiku).

Metadata checked: 2026-10-14T13:20:00.000Z

What's in it

Data offered docs-verified: Flood Alert messages (flooding possible; be prepared) · Flood Warning messages (flooding expected; take immediate action) · Severe Flood Warning messages (severe flooding expected; danger to life)
Coverage docs-verified: Wales · February 2006 to present (Feb 2006 to Jul 2024 in the first file; Jul 2024 onwards in the second)
Update frequency docs-verified: quarterly
Formats docs-verified: Excel
Access docs-verified: Free, no access restrictions; Open Government Licence v3.0 per site footer (dataset licence field shows 'Not set')

Useful for

Use cases llm-inferred: FRA flood history evidence: past flood warning dates and severity for sites in Wales · Validating flood event dates against gauge or rainfall records for a catchment study · Trend analysis of flood warning frequency by year for planning or drainage strategy context
Audience llm-inferred: flood consultants · hydrologists · planners · GIS analysts

Limitations

Constraints llm-inferred: Records switch systems in July 2024 (FWS/FWD to FWISfW), so the two files may not be directly comparable · Provider changed from Environment Agency to Natural Resources Wales; EA data runs only to 1 April 2013 · Quarterly update frequency means recent warnings may not appear immediately · Delivered as Excel files, not a live feed or API · Docs do not describe per-warning location fields, so spatial matching to sites is unverified

Evidence

Check upstream coverage, uncertainty and licence before use. Station observations are not forecasts or design levels.