It's not like ships are bereft of meteorological ressources when no Met Tech is embarked.
First of all, it's important to recall that the Met Techs were embarked, originally, on ships that carried aircrafts - the DDH's - only, hence their being from the RCAF. For instance, the IRE's and Mackenzie's did not carry Met Techs, save perhaps as part of the squadron commander staff for important ops (such as RIMPAC, for instance).
The primary reason to carry Met Techs is for the safety of air ops. In the ships, you otherwise have meteorological capability from the MWO side. Basic to intermediate meteorology is taught at the MARS 3 and 5 level, and meteorology is an important part of the navigation officers courses, as the Navigation Officers of ships with no embark capability are the meteorological advisors to the C.O. As someone mentionned above, meteorological concerns of a ship are less demanding than those of an aircraft and answering "Am I gonna puke" is generally sufficient.
Generally, for ship's operations, meteorology comes down to answering the following general questions: Will there be fog? When? When will it lift? Is there a storm in our future? When? What strenght? Is there a huricanne coming? When? Can I expect to be caught in it's dangerous quadrant?
Thes answers can be given by the Navigation Officer to the CO using shore based provided ressources assisted by the various onboard meteorological instruments. Especially today when the internet provides access to all the meteorological mapping, tools and briefs necessary to determine what will happen at one's location.
Nonetheless, I am happy that the CAF has decided to open the trade to other than just the RCAF