Source: Operation Sea Lion by Richard Cox (1974)

Weather and Sea Conditions in SE England and the Channel in September 1940

Taken from Air Ministry reports at Dungeness.
Tidal information from Office of Hydrographer of the Navy, Taunton.

Thursday, 19th September, 1940, Dungeness

Time

Weather

Visibility

Wind

Force

Sea

700

Blue sky, cloudy, some squalls.

Good

W

4-6

3

1300

Cloudy, squalls

Good

WSW

6-7

4

1800

Cloudy

Good

WSW

6

4

High water Dover 0021, 17.8 ft and 1234, 18.4 ft
Low Water Dover 0736, 0.6 ft and 1953, 0.4 ft

General weather forecast at noon for the next 24 hours: Moderate to fresh SW to W winds, strong at times locally on coast, occasional rain, brighter intervals with risk of local thunder later, average temperatures.

Friday, 20th September


Time

Weather

Visibility

Wind

Force

Sea



0700

Cloudy, squalls and blue sky

Good

W

4-6

3



1300

Cloudy, squalls

Good

WSW

6-7

4



1800

Cloudy

Good

WSW

6

4


High Water Dover 0052, 17.6 ft and 1304, 18.2 ft
Low Water Dover
0801, 0.9 ft and 2017, 1.1 ft

General weather forecast for next 24 hours: Fresh northerly winds decreasing moderate to light tonight; winds backing and freshening tomorrow, considerable bright periods; a few showers today; fine tonight and tomorrow.

Saturday, 21st September


Time

Weather

Visibility

Wind

Force

Sea



0700

Overcast, continuous drizzle

Poor

W

1

1



1300

Overcast

Poor

NE

2

2



1800

Cloudy

Good

Calm

-

0


High Water Dover 0122, 17.4 ft and 1332, 17.6ft
Low Water Dover 0831, 1.6 ft and 2044, 1.7 ft

General weather forecast from noon for the next 24 hours: Light NE variable winds, becoming moderate SE; rain, then a fairer interval, followed by more rain, local fog night and morning; average temperatures.

Sunday, 22nd September


Time

Weather

Visibility

Wind

Force

Sea



0700

Cloudv

Good

S

2

1



1300

Cloudy

Good

SSW

4

3



1800

Cloudy, heavy rain

Mod

SW

4

3


High Water Dover 0152, 16.9 ft and 1402, 16.8ft
Low Water Dover 0856, 2.0 ft and 2112, 2.5ft

General weather forecast from noon for the next 24 hours: Light to moderate southerly winds, becoming cloudy or dull; a period of rain or drizzle, spreading from SW today; local fog near S. Coast; becoming mild.

Monday, 23rd September


Time

Weather

Visibility

Wind

Force

Sea



0700

Cloudy

Good

W

4

1



1300

Cloudy

Good

W

4

3



1800

Cloudy blue sky

Good

WSW

4

3


High Water Dover 0223, 15.9 ft and 1441, 15.6 ft
Low Water Dover 0926, 2.8 ft and 2147, 3.3ft

General weather forecast from noon for the next 24 hours: Moderate to light westerly wind, variable later; fine; local fog in morning; average temperatures, slight ground frost locally at night.

Tuesday, 24th September


Time

Weather

Visibility

Wind

Force

Sea



0700

Blue sky, cloudy

Good

NW

1

1



1300

Cloudv

Good

SW

3

2



1800

Cloudy

Good

N

2

2


High Water Dover 0305, 15.1 ft and 1537, 14.7 ft
Low Water Dover 1006, 3.6 ft and 2236, 4.2ft

General weather forecast from noon for next 24 hours: Light westerly to variable winds; fair with a little local morning fog. Average day temperature, cool at night.

Wednesday, 25th September









Time

Weather

Visibility

Wind

Force

Sea


0700

Blue sky, cloudy, some mist

Poor

NNW

2

1


1300

Cloudy

Good

NNE

4

2


1800

Blue sky, cloudy

Good

NE

4

3








High Water Dover 0412, 14.3 ftand 1707, 14.1 ft
Low Water Dover 1113, 4.4 ft and 2352, 4.8 ft

General weather forecast from noon for next 24 hours: Light or moderate northerly winds, fresh locally on East Coast. Fair, apart from scattered showers near East Coast; rather cool.

Thursday, 26th September










Time

Weather

Visibility

Wind

Force

Sea



0700

Cloudy

Mod

N

2

1



1300

Overcast, mist

Mod

NE by E

4

3



1800

Overcast, mist

Mod

N

4

3










High Water Dover 0535, 14.0 ft and 1829, 14.0ft
Low Water Dover 1237, 4.6 ft

General weather forecast from noon for next 24 hours: Light north or north-westerly winds, mainly cloudy, brighter intervals locally. Rather cool.

Friday, 27th September


Time

Weather

Visibility

Wind

Force

Sea



0700

Cloudy

Poor

WNW

3

2



1300

Cloudy, mist

Mod

W

4

1



1800

Overcast, cloudy, mist

Mod

WSW

5

3


High Water Dover 0711, 14.6 ft and 1948, 15.2ft
Low Water Dover 0127,4.6 ft and 1413, 3.2ft

General weather forecast from noon for next 24 hours: Moderate west to NW winds, fresh at times locally; cloudy, slight showers, bright intervals later; average temperatures.

Saturday, 28th September










Time

Weather

Visibility

Wind

Force

Sea



0700

Cloudy

Good

NW

2

2



1300

Cloudv

Good

NE

5

3



1800

Cloudy, squalls

Good

NNE

5

3










High Water Dover 0815, 15.7 ft and 2048, 16.2 ft
Low Water Dover 0255, 3.0 ft and 1526, 2.3ft

General weather forecast from noon for next 24 hours: Moderate NW to W winds, fair or fine, average temperatures.