On the edge: Level A Set 1 Book 6 Storm Warning by Mike Gould
The weather in England can be bad, but it's not exactly tropical. The odd bit of sun, rain...a few clouds. No one expects a full-blown storm, until it happens! Jan, Lia and her mates seek shelter in Jan's mum's shop. Then the storm really begins, and they need to get out. Quick. Problem is, Lia leaves something behind, and decides to go back. Big mistake!