Storm Agnes

27–28 September 2023 · 2023-24 season · named by Met Office · Ireland, Wales, England, Scotland

▶ Replay this storm hour by hour the rain, the rivers and the warnings on one clock, and the moments that mattered at your door

84 mphmax gust

29flood warnings & alerts (England)

First named storm of the season, bringing strong winds gusting to ~84mph (Capel Curig, Wales) and heavy rain across the British Isles, causing travel disruption and some surface-water flooding.

Flood footprintEnvironment Agency warning history, England · storm total

0severe warnings

2flood warnings

27flood alerts

25areas

22counties

14rivers & seas

Counted from the Environment Agency's warning record for England (26–28 September 2023). Welsh warnings are held in a separate record and are not counted here, and FloodRadar only began recording Scottish warnings on 16 September 2026 because SEPA publishes no archive. So this is England's share of the storm, not its total.

Worst-hit areas

Christchurch Harbour2
Coast at North Morecambe Bay2
Mersey Estuary at Warrington2
Wyre estuary from Fleetwood and Knott End to Little Eccleston2
Climping Seafront1
Coast from Gretna to Silloth1

Counties

Lancashire4
Cumberland4
East Riding of Yorkshire4
Bournemouth3
Christchurch and Poole3
Norfolk3

Rivers & seas

Irish Sea5
North Sea5
English Channel4
Bristol Channel2
Mersey Estuary2
North Cornwall Coast2

Flood mapthe storm's flood footprint

Red/amber rings mark rivers that reached or came close to their own high level during the storm — the most direct evidence of likely flooding (the gauge measures the river, not any one property). Solid dots mark each flood area's reference point, coloured by the most severe warning raised there — a warning means flooding was expected. Shaded shapes are the Environment Agency's recorded flood outlines: land actually observed flooded, published retrospectively (updated quarterly). England data only. An unshaded area 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 rainstorm-total by gauge

Gauge	Total mm
Honister	86.4
Ennerdale Black Sail	85.4
Seathwaite Farm	83.2
Mickleden Middle Fell Farm	78.0
Glenridding Greenside Mines	74.0
Dale Head	70.0
Thirlmere St Johns Beck	68.4
Coniston Coppermines	64.7
High Row	64.0
Brotherswater	59.6
Ennerdale Starling Gill	54.4
Force Crag	51.1

The riverspeak vs warning level

Station	Peak	% of warning
Clifton Hall · River Mease	5.38 m	364%
Mansfield The Dykes · River Maun	3.04 m	304%
Wensor Bridge, Shelton · River Devon	4.63 m	272%
Ashford in the Water · River Wye	1.67 m	223%
Prestbury Road · Wymans Brook	0.09 m	180%
Bacons End · River Cole	0.69 m	179%
Repps · River Thurne	1.37 m	176%
Kielder Butteryhaugh · River North Tyne	0.92 m	164%
Sidmouth Higher Woolbrook Road · Wool Brook	1.09 m	156%
The Causeway · Dimore Brook	0.84 m	155%
Bedburn · Bedburn Beck	1.60 m	152%
Brookhouse Farm · Ford Green Brook	1.39 m	146%

Gauge records cover 26–29 September 2023 (the storm window ± a day). Frozen 3 Jul 2026.

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FloodRadar compiles Environment Agency warning history, gauge data and public reporting. It is not an emergency service and does not replace official flood warnings — always follow official guidance during a storm.