For Alton Water Reservoir : No gale warning.
The reliability of the situation is good.
Very cloudy in the morning, cloud largely disappearing in the afternoon. The risk of seeing rain will remain low.
In the evening, fair weather with mostly clear skies. NNW force 5 becoming N force 4 in the middle of the day then NNW force 2. Gusts reaching 25 knots in the morning. Excellent visibility becoming good in the middle of the day then poor.