A Flood Alert was issued for Silk Stream and the Deans, Edgware, Dollis, Mutton, Wembley and Wealdstone Brooks in Barnet, Brent, Greater London, Harrow on 27th August 2026. Affected watercourses included the Silk Stream; Dollis Brook; Deans Brook; Edgware Brook; Mutton Brook; Wealdstone Brook; Wembley Brook.
During this event, FloodRadar monitoring gauges recorded notable rises. The Wealdstone Brook at Kenton Lane rose 0.23m, peaking at 0.37m, while the Wealdstone Brook at Wembley climbed 0.10m.
Environment Agency advice issued
Rising river levels may lead to flooding this evening Thursday 27 August 2026 due to forecast heavy rain and storms. If the heaviest rain affects the Hendon, Wembley, Harrow, Wealdstone, Edgware or Stanmore areas there is the possibility that rivers could overtop their banks. Flooding from surface water, where water gathers and flows off road surfaces, could also occur. We expect river levels in areas that receive the heaviest rain to respond by rising quickly. Further heavy rain and thunderstorms are forecast tonight Thursday 27 August and into Friday 28 August. We are closely monitoring the
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| Kenton Lane | Wealdstone Brook | +0.23m | 0.37m |
| Wembley | Wealdstone Brook | +0.10m | 0.16m |
| Brent Cross | River Brent | +0.10m | 0.17m |
| Colindale | Silk Stream | +0.10m | 0.20m |
| Hampstead Suburb | Mutton Brook | +0.09m | 0.89m |
| Edgware Hospital | Silk Stream | +0.05m | 0.69m |