State surveyors will travel up the High Sierra to take their monthly measurements of the snowpack, learning if recent storms brought any relief to California's drought.
The state's Department of Water Resources says expectations are low for Tuesday's figures, despite surveyors performing their work this week as storm clouds burst open.
Rain fell in San Francisco on Monday afternoon, and by evening, snow began blanketing the Sierra Nevada in a system expected to deliver up to a foot by early Wednesday. National Weather Service forecasters said some places at high elevation may get 2 feet of fresh snow, but this won't end the drought.
The April 1 survey is critical because it marks the peak of the snowpack. There's just one month remaining of the rainy season.