A: The wind is light and mainly westerly; pressure may have been rising but has steadied. There may be cumulus cloud (fluffy type) but to no great extent. There may be a little cloud showing on the western horizon.

B: The pressure is starting to fall. Thin cirrus (high mare's tails or a mackeral sky) is streaming across the sky from the North West. This could be a couple of hundred miles ahead of the warm front.

C: The surface wind is S or SSE and increased a little; pressure falls more quickly, cloud covers the whole sky but is still cirrus stratus (stratus is layer type cloud), There may be a halo from the sun or moon.

D: The wind is S or SSE, a little stronger, with pressure falling faster. The cloud thickens and lowers to alto-stratus (medium layered cloud) then lowers with patches of low stratus scudding across the sky. It will soon rain, with worsening visibility, the wind may back a little more East of South and the pressure will continue to fall. As the warm front passes, rain turns to drizzle or stops, pressure stops falling or falls more slowly, with the wind veering to WSW or SW. There may be breaks in the low cloud, well away from the centre, with no high cloud showing through the breaks. In the warm sector visibility may be poor, especially if there's drizzle; there could be fog too because the air is more warm and humid.

E: As the cold front approaches, pressure will fall quickly and wind may back slightly. The cloud now thickens before a short period of heavy rain, hail or thunderstorm with thunder and lightning.

As the cold front passes point F, the wind veers NW, pressure rises, the cloud breaks and visibility improves. Convective cloud (heap type) develops with occasional showers. If another low approaches, convection clouds will be replaced by high cirrus (mare's tails) clouds appearing.

H-L: Where the centre of low pressure passes to the south of you, expect the same as above, with the wind backing and upper clouds increasing.

I: The wind is SE, with pressure falling and cloud increasing.

J: The wind will be Easterly, pressure has stopped falling and cloud increased sufficiently to bring rain. Visibility is worse but not as bad as in the warm sector (ie between the fronts) - weather is generally more gentle than south of the low pressure centre.

L:The wind has backed to N or NW, with pressure rising rapidly as the cloud breaks to allow cumulus or cumulonimbus to develop. The sudden changes that occur to the south of the centre don't occur to the north.