After a week of stormy weather across California, a break in the clouds provided a glimpse of a mountainous landscape transformed by snow. The Sierra Nevada mountains were replenished after seeing a dismally low snowpack to start the year, and snow even temporarily closed Yosemite National Park. New images from NASA show the huge difference a few stormy days can make. …Two weeks ago, on Feb. 9, the Sierra Nevada mountains held just 53% of their average historical snow level for that date. By Sunday, the snowpack was at 73% of the typical level, per data from the California Department of Water Resources. …The Northern Sierra lagged behind the rest of the mountain range, seeing just 53% of its typical level of snow as of Sunday. The Central Sierra was at 73%, while the Southern Sierra saw the biggest gain, reaching 98% of its normal snow-pack.