Full Idea
Various kinds of correlations exist that provide excellent bases for prediction, but because no suitable causal relations exist (or are known), these correlations do not furnish explanation.
Gist of Idea
Correlations can provide predictions, but only causes can give explanations
Source
Wesley Salmon (Four Decades of Scientific Explanation [1989], 2.3)
Book Reference
Salmon,Wesley C.: 'Four Decades of Scientific Explanation', ed/tr. Humphreys,Paul [Pittsburgh 2006], p.49
A Reaction
There may be problem cases for the claim that all explanations are causal, but I certainly think that this idea is essentially right. Prediction can come from induction, but inductions may be true and yet baffling.