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Sierra Nevada snowpack just 18% of normal — second-lowest in recorded history

Sierra Nevada Snowpack Hits 18%, Second-Lowest on Record California's Sierra Nevada snowpack has plummeted to just 18% of normal levels, marking the second-lowest measurement in recorded history. A devastating March heat wave accelerated snowmelt across vast regions, threatening long-term water supplies. However, water restrictions remain unlikely this year due to previously full reservoir levels from past wet seasons.