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Winter Weather in West Slope Northern Sierra Nevada, California

Winter Weather May 12, 2025 · West Slope Northern Sierra Nevada, California

What the National Weather Service wrote

A weather system brought a brief period of moderate snow showers that led to multiple spinouts and a jackknifed big rig. These accidents resulted in the closure of I-80 westbound at Truckee. Traffic was initially stopped at 4:46 PM PDT but was then closed from 4:56 PM PDT through 7:54 PM PDT. Chain restrictions were in effect for trucks for most of the day. UC Berkeley Central Sierra Snow Lab measured 5.9 inches of snow in 24 hours at 6894 feet.

The wider storm

On May 12th, a weather system brought a brief period of moderate snow showers that led to multiple spinouts and a jackknifed big rig. These accidents resulted in the closure of I-80 westbound at Truckee. Traffic was initially stopped at 4:46 PM PDT but was then closed from 4:56 PM PDT through 7:54 PM PDT. Chain restrictions were in effect for trucks for most of the day.

Source: NOAA Storm Events Database, event 1249032. Narratives are written by the National Weather Service forecast office that issued the report.

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