There is a lot of snow in the mountains of Southwest Washington, but not for the reasons you might think. As of Sunday, the Lower Columbia Basin, which includes the Lower Columbia River, Lewis River Basin, Cowlitz River Basin, and Mount Hood, was at 124 percent of normal snow water equivalent — the largest in the entire state. But officials say that accumulation isn’t connected to the big snowstorms that hammered the Portland and Vancouver metro area a couple of weeks ago. In fact, the snowpack’s performance against the norm shrank 9 percent between Jan. 1 and the start of this week. It’s not that snow in the mountains melted, either. Around the week of Jan. 14, when the temperature dropped and the sky was dumping snow downtown, conditions were pretty dry in the high elevations.