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Flooding possible. Be prepared.
Forecast high river levels overnight may lead to flooding.
Flooding is possible from the early hours of 27 August 2026 due to forecast heavy rain and storms overnight.
It is unclear where the heaviest rain will fall. Locations most affected will be low lying land, roads and riverside gardens. 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 during the day on Thursday 27 August and into Friday 28th August.
We are closely monitoring the situation and we are prepared to issue flood warnings if required.
Take care and avoid walking, cycling or driving through flood water and avoid using low lying footpaths and any bridges near watercourses.
This message will be updated by 10:00AM on 27 August 2026 or as the situation changes.
Information supplied by the Environment Agency
This information last updated 8:22pm, Wednesday 26th August.
Flood alert
Wed 26 Aug 2026, 8:22pm
Warning no longer in force
Sun 20 Jul 2025, 9:59am
Flood alert
Sat 19 Jul 2025, 5:27pm
Flood alert
Sat 19 Jul 2025, 11:17am
Flood alert
Fri 18 Jul 2025, 3:54pm
Warning no longer in force
Sat 14 Jun 2025, 9:31am
Flood alert
Fri 13 Jun 2025, 4:11pm
Warning no longer in force
Mon 23 Sep 2024, 5:59pm
Flood alert
Mon 23 Sep 2024, 7:52am
Flood alert
Sun 22 Sep 2024, 3:28pm
The Silk Stream and the Deans, Edgware, Dollis, Mutton, Wembley and Wealdstone Brooks and their tributaries
Region: Herts and North London
Country: England
Counties covered: Barnet, Brent, Greater London, Harrow
Watercourses covered: Silk Stream; Dollis Brook; Deans Brook; Edgware Brook; Mutton Brook; Wealdstone Brook; Wembley Brook
The area bounded in blue on the map shows the area covered by flood alerts and warnings for Silk Stream and the Deans, Edgware, Dollis, Mutton, Wembley and Wealdstone Brooks.
Note: the area shown on the map is the area covered by flood alerts and warnings. It is not a live map of current flooding. The area covered broadly equates to the area where the risk of flooding in any year is greater than 1% (the "hundred year" flood risk).
No current or recent warnings.
No current or recent warnings.
No current or recent warnings.
No current or recent warnings.
No current or recent warnings.
No current or recent warnings.
No current or recent warnings.