Max (Celsius)

Min (Celsius)

Rainfall (mm)

AIRHEAD

30.0

23.5

TRACE

TRAVELLERS

29.9

22.0

1.4

RESIDENCY

25.3

18.6

1.5

GEORGETOWN

30.9

23.1

NIL

ST. HELENA

20.3

12.7

8.2

FALKLANDS

7.5

-1.3

17.8

UK (Brize Norton)

27.0

10.3

NIL

UK

High pressure has remained in charge with little or no rainfall and above average temperatures.

Falklands

An unsettled week with showers, some wintry in nature. An average week in terms of temperature and precipitation. Windy, however, after late Tuesday with icy gales so significant wind chill.

Ascension

A mainly dry and bright week with very little rainfall at the airhead. A few showers occurred around Traveller’s Hill on Monday morning.

St. Helena

A mixture of bright spells and some showers with variable amounts of cloud. Some showers brought visibility down to    4000 M and cloud base to 200-300 FT on Friday.

Ascension Island is on the northern flank of the South Atlantic anticyclone so the more or less constant south-easterly surface wind does not lend itself to sea breezes, but how do sea breezes form? Most people have experienced the sea breeze when having a holiday to the seaside, whether it is in the UK or Florida. One expects a nice hot day (which it may well be inland) and then once at the beach the temperature at times can be up to 12-15 C cooler then, say, 20-30 miles inland. But why is this the case? The answer lies in the sea temperature. In the north-east of England, for example, the North Sea temperature is at its coolest in Spring (after the long winter months, slowly cooling the sea). At the same time the sun is starting to strengthen and warm up the land. The ultimate aim to get the largest difference possible between the land and sea temperatures. Once this has been established, usually in the afternoon, a pressure minimum forms over the land and a breeze begins to form, i.e air moving from a higher pressure to a lower pressure. An example would be in Yorkshire, UK, with settled conditions with a prevailing light westerly wind. In the afternoon a sea breeze would develop with a colder light easterly wind. Sometimes when these two winds meet, showers can develop along a convergence line some miles inland. This can be more vigorous in places like the Florida peninsula where you get a sea breeze developing from both coast lines and where they meet, thunderstorms can develop.