After lunch wrote a 'scorer' for my diary weather-extract script - it gives each day a score indicating how likely it is to pertain to weather, based on which key words appear in it. I derived the key words by going through a list of the most common words in the days which I've already excerpted into the Weather Diaries blog. Took about an hour to do, but will save me ages in the long run.

(10.45pm). Really thick fog now. You can actually smell it downstairs.

Some sun
2230 THICK FOG
Moon-through