1910: A severe cold wave visited the Coeur d’Alene region of northern Idaho on the 22-23rd. The cold was followed by a warm wind and heavy fall of snow. During the 5 day period ending on the 27th, the total snowfall at Burke, Idaho was 39 inches, and the measured amount of precipitation was 4.06 inches. On the 27th, about 8:30 pm, the snow ceased and the rain set in. At 10:50 pm, the first series of destructive avalanches began. Part of the mining town of Mace was inundated by snow. A short time afterward, a second slide buried part of the nearby town of Burke. Several other occurred in the district. Seventeen people were killed and many others injured.
2010: A magnitude 8.8 earthquake occurred off the coast of central Chile at 3:34 local time. The earthquake triggered a tsunami which devastated several coastal towns in south-central Chile. Tsunami warnings were issued in 53 countries. Waves caused minor damage in San Diego area and the Tohoku region of Japan.
— NWS (@NWS) February 27, 2017
2017: Thundersnow was observed in the Seattle area. The video from Twitter shows lightning striking the Space Needle.
— Mark D. Lim (@markdlim) February 27, 2017