Storm Aiden

31 October – 1 November 2020 · 2020-21 season · named by Met Eireann · Ireland, Northern Ireland

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

81 mphmax gust

87flood warnings & alerts (England)

First storm of the season; gusts to ~81mph at Malin Head left over 8,000 Irish homes without power, mainly a wind event with limited flooding.

Flood footprintEnvironment Agency warning history, England · storm total

0severe warnings

18flood warnings

69flood alerts

79areas

46counties

58rivers & seas

Counted from the Environment Agency's warning record for England (30 October – 1 November 2020). 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
Humber estuary from Spurn Point to Winestead Outfall2
Lower River Ure2
River Dee catchment in England from Whitchurch to Chester2
River Ribble at Samlesbury, around Brockholes Reserve and Lower Brockholes Quarry2
Rivers Duddon, Crake and Mill Beck2

Counties

Lancashire21
North Yorkshire20
Westmorland and Furness12
Devon10
Cumberland9
Leeds5

Rivers & seas

English Channel7
River Ribble6
North Cornwall Coast3
River Eden3
River Wyre3
Burrow Beck2

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
White Barrow	198.8
Honister	156.8
Dale Head	145.0
Seathwaite Farm	141.6
Ennerdale Black Sail	140.6
Beckermonds	137.8
Tow Hill	128.6
Mickleden Middle Fell Farm	126.0
Footholme	123.2
Thirlmere St Johns Beck	122.8
Wet Sleddale	120.0
Littondale	119.6

The riverspeak vs warning level

Station	Peak	% of warning
Hunsingore · River Nidd	2.53 m	362%
Todmorden Millwood · River Calder	2.12 m	281%
Roe Bridge · River Brock	4.15 m	277%
Cononley · River Aire	2.81 m	264%
Mansfield The Dykes · River Maun	2.61 m	261%
Kelbrook · Kelbrook Beck	0.87 m	255%
Saintbridge · River Twyver	0.11 m	252%
Middlesbrough Albert Park Footbridge · Marton West Beck	0.36 m	237%
Brigflats · River Rawthey	3.58 m	230%
Shipley · Bradford Beck	0.89 m	224%
Low Houses · Snaizeholme Beck	1.33 m	221%
Stoney Lane · Whitley Beck	1.09 m	218%

Gauge records cover 30 October – 2 November 2020 (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.