I appreciate this is an old thread, but something made me think last Friday (4th July). I was returning home from the UEA Open Day in Norwich (via the A12 from Lowestoft).
When i arrived at Ipswich there was a 'sheet' of high cloud to the southwest (similar to PB's pic above), and Ipswich seemed to be on the edge of this sheet which i think was ahead of an advancing occlusion that night? The time was about 6.45-7pm i think. Anyway i travelled down the A12 where i got stuck, as always, in a traffic jam on the M25 at the Dartford Crossing. This is when i looked out of the window (bearing in mind i was well under the 'sheet' of high cloud) and right in the very distance (as far as i could see just ahead of the horizon) was the edge to this 'sheet' of cloud.
Providing that the cloud was stationary, does this mean that the horizon can be some 60 miles away?
I understand the cloud-edge may have moved in the duration of the car journey from Ipswich to Dartford, but if anything it would be moving away from me rather than towards me as the front was advancing from the SW.



Just a general observation from my car, wasn't sure if it was possible, given that the QE2 Bridge is well raised, that the viewable horizon can be as much as 60miles away?

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