The anecdotal evidence from people who were actually in Praia da Luz on the day in question stating there was an improvement in the weather swings it for me.
I think it would be fair to say that both the anecdotal evidence from people in Praia da Luz on that day (Thursday 3 May) and any reliable weather date we have for that day broadly coincide. I think we can probably agree the following:
1. There had been cooler, cloudier conditions on the Monday, Tuesday and Wednesday.
2. During the course of Thursday, these cooler, cloudier conditions gradually yielded to warmer, sunnier weather in the late afternoon/early evening.
3. That Last Photo is said to have been taken at 2.29pm Portugal/GB time.
4. Around 1pm, the temperature peaked at only 17C (63F), then fell back a little, then rose late afternoon to 19F (66C).
5. Cloud cover probably abated gradually during the day.
6. It is quite possible that there could have been a sunny interval causing the sun to shine at 2.29pm that afternoon.
7. It was unarguably warm and sunny on the Sunday, with a temperature maximum around 2.29pm of 21C (70F).
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However, whether the sun was actually shining at 2.29pm is essentially beside the point.
The Last Photo is evidence. It is a genuine, unphotoshopped, photo.
A dispute has arisen as to whether it might have been taken on a different day.
We are entitled, inter alia, to examine the contents of the photograph to see which date best fits what we see. I appreciate that the EXIF metadata say it was taken on 3 May, but then we know it is a relatively simple issue to alter the metadata.
This is what we see in the photograph:
* Gerry in shorts
* Gerry in T-shirt
* Gerry with sunglasses
* Gerry with sheen of perspiration on his forehead
* Gerry with his feet in a cold pool
* Madeleine in light clothing - no trousers
* Madeleine with sun-hat
* Amelie in light clothing - no trousers
* Amelie with sun-hat
* No sign of any cooling breeze.
Also:
1. Although it was claimed that Gerry bought sunglasses at the beach on Tuesday, it is surely more likely than not that he brought a pair of sunglasses with him on holiday.
2. The 'Last Photo' scene of Gerry and his two children by the pool on a sunny day was actually embellished in the BBC Crimewatch McCann Special, which showed Gerry, Kate and Madeleine happily kicking their feet in the water.
Now, I am fully aware that on this forum there are some people who are very well informed and briefed.
The very same people are good, persistent debaters who generally give no quarter.
I respect their knowledge and abilities.
However, given the information we have about the Last Photo, and given what we know about the likely weather at 2.29pm on Sunday and Thursday respectively, no matter how hard people may try and get round the situation, it is inevitable that many people, examining the evidence impartially, may well draw the conclusion that it is far more likely than not that the Last Photo was taken on the Sunday.