Ongoing atmospheric river event bringing heavy rainfall in Sierra Nevada
From Daniel Swain at Weather West:
“I’ll cut to the chase in this post, since it’s looking like an active pattern may bring some high-impact weather to much of California over the next 7-10 days. The first of these events is already underway–an abundant plume of subtropical moisture is streaming northeastward over the far eastern Pacific and bringing copious rainfall to the western slopes of the Sierra Nevada. Note that I did specifically say “rainfall” as opposed to snowfall–snow levels are well above 7000 feet in most instances (not surprising, given the warm, low latitude origins of the airmass over California). Heavy rainfall is melting some of the lower elevation snowpack that has developed in the 5000-7000 elevation band–causing heavy runoff into Sierra Nevada streams and rivers. The Truckee River is already expected to crest above flood stage this weekend (and may do so again later this week–see below). … ”
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