I tried using the CSL search by example, and the closest existing citation style I found was "Population, Space, and Place", which just is missing the issue number. I tried to edit the citation in the visual editor, but I don't see how to add fields that weren't there originally (issue number).

So I either want to learn how to do that, or else here is the style request info on Hydrological Processes:

Campbell JL, Pedersen OK. 2007. The varieties of capitalism and hybrid success. Comparative Political Studies 40(3): 307–332. doi:10.1177/0010414006286542

Mares I. 2001. Firms and the welfare state: When, why, and how does social policy matter to employers? In Varieties of capitalism. The institutional foundations of comparative advantage, Hall PA, Soskice D (eds). Oxford University Press:New York; 184–213.

ISSN: 0885-6087 (Print), 1099-1085 (Electronic), 0885-6087 (Linking)

The instructions to authors:
http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1099-1085/homepage/ForAuthors.html

An open access article example:
http://onlinelibrary.wiley.com/doi/10.1002/hyp.10511/epdf