Thames NOW

Latest news on what the river is actually doing: Barrier, Tides, River flow, Floods

Caution: Based on automated data capture. Accuracy not guaranteed. See notes below.

SUMMARY as at 04:33 on 20 May 2019

 - Thames Barrier open
 - River level in Central London close to prediction
 - River flow at Kingston is lower than normal. This may result in slightly lower water levels than predicted (at both high and low tide) between Richmond and Putney.
 - Flood Alert for Thames Riverside properties

FLOOD ALERT for Thames Riverside, Putney to Teddington

Message from the Environment Agency:
Levels on the River Thames are expected to be high as a result of spring tides. The forecast high tide at Richmond is anticipated to be 4.65mAOD at 04:30 BST on 20 MAY 2019 and 4.50mAOD at 16:45 BST on 20 MAY 2019.

Flooding of low-lying roads and footpaths is expected at these times, although conditions may exist for one to two hours either side of high tide.

We believe there is a possibility of flooding for Putney Embankment (SW15), Chiswick Mall and Strand on the Green (W4), Thames Bank at Mortlake (SW14), Ranelagh Drive (TW1), Friars Lane and Water Lane (TW9), Riverside and The Embankment at Twickenham, and the Towpath below Teddington Lock.

Flooding of properties is not expected.

Astronomical tide levels are rising. The river flow at Teddington Weir is low for this time of year at 20 cubic metres per second and is steady. We anticipate the flows to remain low for the next five days.

Message updated: 18:26, 19 May
For flood alerts and warnings for other Thames areas, see the Environment Agency's Flood Information Service.

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If the PLA flow status differs from the reported Kingston flow above, this is usually because the latter is more recent.

RAW DATA as at 04:33 on 20 May 2019

For those of you who prefer to see the actual numbers on which the summary above was based, here is the raw data. Please note the explanations and legal note below the data.

Tide GaugeObservedPredictedSurge
Kingston flow gaugeflow rate 13.3 cumecs (m3/sec) and decreasing
as at 03:30, 20 May - latest available data

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Tide gauge data is obtained in real time from the Port of London Authority (PLA), based normally on measurements in the previous 5 minutes. "Observed" is the actual gauged height in metres above local chart datum. "Predicted" is the astronomical prediction from the tide tables. "Surge" is the difference between the two, which typically is caused by current or recent weather conditions. The Kingston flow gauge reading and flood alert information are extracted in real time from the Environment Agency (EA). The barrier open/closed status is based solely on the difference in recorded river levels either side of the barrier (Charlton & Silvertown) and assumes accurate readings from those gauges.

I am grateful to PLA and EA for permission to use the above data.

Legal note: The recording and capture of the data is performed by automatic processes, and the data is essentially unvalidated at the time of display here. Accuracy is not guaranteed. PLA, EA and I do not accept any responsibility in law for the information presented here. - Richard Jennings

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