Update: Colder over Oakland, snow at Donner Pass

UPDATE: Even colder air has moved in over Oakland late this afternoon with -31 C reported at 500 hPa, the coldest May sounding in at least the past 12 years.  Nearly a foot of new snow has fallen today at Donner Pass along I-80 with the temperature remaining in the range 26-28 F throughout the day.

11 May 2000   -26 C
26 May 2000   -26
20 May 2002   -28
21 May 2002   -26
23 May 2010   -30
27 May 2010   -26
15 May 2011   -31
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