Flood Alert Issued for Hertfordshire and North London
Areazine synthesizes this Environment Agency flood warning directly from Environment Agency's official public data feed. See our methodology for full source attribution and refresh cadence.
Environment Agency issues flood alert for Silk Stream and multiple brooks due to forecast heavy rain and storms overnight.
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- Record type
- Flood Alert
- Affected area
- Hertfordshire and North London
- Issued
- August 26, 2026
- Issuing authority
- Environment Agency
Flood notices turn on location and timing. Treat the named area as this record's scope; do not assume nearby counties, parishes, or waterways were included.
Record status: publication date is recent, but current status is not stored on this page. Check the issuing agency's live warning service before acting because warnings can be updated, narrowed, or cancelled.
Alert Details
Flood alert issued by the Environment Agency for Silk Stream and the Deans, Edgware, Dollis, Mutton, Wembley and Wealdstone Brooks. Severity level 3. Alert raised at 2026-08-26T20:22:02.
Affected Areas
Barnet, Brent, Greater London, and Harrow counties. Specific waterways include Silk Stream, Dollis Brook, Deans Brook, Edgware Brook, Mutton Brook, Wealdstone Brook, and Wembley Brook. Locations most at risk include low-lying land, roads, and riverside gardens, particularly if heaviest rain affects Hendon, Wembley, Harrow, Wealdstone, Edgware, or Stanmore.
What You Should Do
Take care and avoid walking, cycling or driving through flood water. Avoid using low-lying footpaths and any bridges near watercourses.
Expected Conditions
Forecast high river levels overnight may lead to flooding from early hours of 27 August 2026 due to heavy rain and storms. Rivers could overtop banks in areas receiving heaviest rain. Surface water flooding where water gathers and flows off road surfaces is also possible. River levels may rise quickly.
Timeline
Alert effective from early hours of 27 August 2026, with further heavy rain and thunderstorms forecast during the day on Thursday 27 August and into Friday 28 August. Message will be updated by 10:00AM on 27 August 2026 or as the situation changes.
Original source: Environment Agency Official Notice ↗
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Nationwide notices with similar length or severity timing 8
Two Areazine-derived peer sets for this Environment Agency flood warning: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,330 characters here).
Similar severity timing
Same severity (medium) notices issued closest in time to August 26, 2026.
Frequently Asked Questions
Common questions about this Environment Agency flood warning.