For a fourth straight day, a spell of unseasonable warmth pushed temperatures to record-breaking heights Thursday, Feb. 11 in the San Diego area. This month’s start has been the warmest since 1963 — but not by much. In early February of 2015, average temperatures were only about 1.4 degrees lower than this year, and highs in the 80s or beyond stretched over four days.
Jul 5, 2016 | Weather Underground
Persistent cold air outbreaks in a warmer world
Apr 12, 2016 | Scientific American Blog Network
What Is This Polar Vortex That Is Freezing the U.S.?
| Nature Communications
Paired oxygen isotope records reveal modern North American atmospheric dynamics during the Holocene
Feb 17, 2016 | CNN
Record-breaking cold sweeps Eastern US