Around 40 schoolchildren are awaiting rescue after their bus slid off a road near Crymych in Pembrokeshire.
The pupils, from Ysgol y Preseli, were on their way home after their school closed early due to bad weather.
It happened between Maenclochog and Mynachlogddu. There are no reported injuries.
A spokesperson for Pembrokeshire County Council said: "The pupils are staying onboard while waiting for a relief bus to collect them and continue their journey."
On Monday, 16 children and three adults had a lucky escape when a schoolbus slid off the road and became trapped on an embankment in the village of Llanfach, near Abercarn.
More top news
It will be a sunny day for most, although rather windy. Cloud will increase from the east through the afternoon.
A warm and pleasant evening for many. Clear and cool overnight.
Continuing to be a fine and dry day across the country with lengthy sunny spells.