Atmospheric River Set to Deliver Rain and Mountain Snow Along I-80 Corridor near Reno
A developing atmospheric river is set to impact the Sierra Nevada and northwestern Nevada later this month. According to the National Oceanic and Atmospheric Administration (NOAA), this system is anticipated to bring heavy rain, strong winds, and high-elevation snow.
Forecast Timeline and Regions Affected
The atmospheric river is expected to reach the West Coast between October 23 and 27, 2023. The areas most at risk for significant precipitation include:
- Washington
- Oregon
- Northern California
- Western Nevada
Snow and Travel Implications
Forecasters predict heavy snowfall in the northern region of the Sierra Nevada, particularly along Interstate 80 near Donner Summit. Higher elevations around Reno and Lake Tahoe may also experience snowfall. Travel disruptions are likely, and chain controls may be implemented if snow levels drop sufficiently during the event.
Precipitation Outlook
Rainfall is projected to increase significantly in lower valleys, including Reno and parts of western Nevada. According to NOAA’s outlook, rainfall could surge by 50-60% above normal levels for this period. However, the potential for flooding west of the Cascades and along the eastern Sierra remains uncertain.
Understanding Atmospheric Rivers
An atmospheric river is essentially a long, narrow region in the atmosphere that functions like a sky river, transporting moisture from tropical regions. NOAA reports that the average atmospheric river carries an amount of water vapor similar to the average flow of water at the mouth of the Mississippi River. Some atmospheric rivers can even transport more than 15 times that volume.
In summary, the imminent atmospheric river poses significant weather impacts for the Sierra Nevada and surrounding areas. Residents and travelers should prepare for the potential effects of heavy rain and snow as this system approaches.
