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NRW has no flood warnings or alerts in force in Wales. Last successful check: 2026-11-04 07:48:02 UTC.
No current NRW warning or alert matched the location of Gelli River Station. That does not establish warning coverage for the whole town: only these gauge points were checked.
Read Wales’s warnings · Check your area on Natural Resources Wales
Messages: Natural Resources Wales flood warnings API. Warning-area boundaries: Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Reused under the Open Government Licence v3.0. Boundaries from DataMapWales.
No official flood warning is active nearby and the closest river stations are within normal ranges.
Updated 2026-11-04 07:48:08 UTC · Official GOV.UK warnings · Flood preparation & help guide
Gelli is monitored by 1 Natural Resources Wales river level station on the Rhondda Fawr, in Rhondda Cynon Taf. Water levels are updated every 15 minutes.
Flood Zones, Warning Areas and Surface Water are Environment Agency maps and cover England only. Gelli is in Wales, so they draw little or nothing here — that is where the map ends, not an absence of flood risk. Natural Resources Wales’s warning areas have their own pages under flood areas.
The nearest watercourse on the river map is Afon Rhondda (Rhondda River), about 50 m from the middle of Gelli's gauges. It flows into the River Taff (Afon Taf) about 14 km downstream.
A gauge downstream shows water that has already passed this point; one upstream sees it first. Distances along the river are from the point on Afon Rhondda (Rhondda River) nearest the middle of Gelli's gauges. From Ordnance Survey’s river map (OS Open Rivers), which leaves out small streams, ditches and culverts, so a nearer one may exist. This describes where water goes on the map; it says nothing about flooding at any address. Contains OS data © Crown copyright and database rights 2026.
Gelli is monitored by 1 Natural Resources Wales river level station on the Rhondda Fawr, in Rhondda Cynon Taf. Water levels are updated every 15 minutes, providing real-time flood monitoring for the area.
The Rhondda Fawr is monitored by 1 station (Gelli River Station). Each station records water levels continuously, with data synced to FloodRadar every 5 minutes.
No Environment Agency flood warning area is mapped within 10km of Gelli. That means the EA has not defined a warning target area here, which is not evidence the town cannot flood: warning areas exist where the EA runs a warning service, and surface-water and groundwater flooding have no warning areas at all. The EA’s register covers England only — Gelli is in Wales, where the warning service is Natural Resources Wales’s, and FloodRadar publishes its areas alongside the EA’s on the flood areas index.
There are 67 storm overflows within 5km of Gelli. None of the 62 with a reporting monitor are currently discharging (5 have no live status right now). Enable "Sewage" on the map above to see their locations.
6 of them, nearest first, with their own page of live status and past discharges:
If flooding is forecast in Gelli, call Floodline on 0345 988 1188 for the latest information. Move valuables upstairs, turn off gas and electricity if safe to do so, and avoid walking or driving through flood water. Sign up for flood warnings on any station page above to receive email alerts when water levels rise. For emergency numbers, a preparation checklist and insurance guidance, see our flood help & preparation guide.
Gelli gets about 2,270 mm of rain a year on average (wettest month December, 278 mm; driest May, 124 mm). That is 95% wetter than the UK as a whole, which averages 1,163 mm a year. See the rain gauges →
A thirty-year average for the area, not a forecast and not a flood risk on its own. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 2.5 km away. Average rainfall: HadUK-Grid v1.3.2, Met Office. Contains public sector information licensed under the Open Government Licence v3.0.
No recorded flood outline within ~5 km of the Gelli town centre means no flood was mapped here, which is not evidence none happened: the Environment Agency mapped only some floods, mapping effort rose sharply after about 2000, and surface-water flooding is largely absent from this record. The Environment Agency's Recorded Flood Outlines cover England only, and Gelli is in Wales — so an empty record here is an absence of coverage, not an absence of floods. Open the recorded-floods map →
Current verdict: Normal. No official flood warning is active nearby and the closest river stations are within normal ranges.
Gelli has river level monitoring on Rhondda Fawr — 1 monitoring station in total.
Use Natural Resources Wales flood warnings (flood-warning.naturalresources.wales) or call Floodline on 0345 988 1188 (24 hours). You can also set up free FloodRadar email or browser alerts from any station page above.
Follow official advice: move valuables and vehicles to safety, never walk or drive through flood water, turn off gas and electricity if safe, and check on vulnerable neighbours. See our flood preparation guide at floodradar.co.uk/flood-help.
No recorded flood outline is mapped around the Gelli town centre means no flood was mapped here, which is not evidence none happened: the Environment Agency mapped only some floods, mapping effort rose sharply after about 2000, and surface-water flooding is largely absent from this record. The Environment Agency's Recorded Flood Outlines cover England only, and Gelli is in Wales — so an empty record here is an absence of coverage, not an absence of floods. FloodRadar holds at least 10 Natural Resources Wales flood warnings or alerts recorded within 15 km of Gelli, the most recent on 26 October 2026. See the flood history link below.
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