In the South Pacific, the blast obliterated a volcanic island and set off a tsunami believed to have caused at least two deaths. It has covered nearby islands with ash and severed a key communication link for the island nation of Tonga.
"The dangerously cold wind chills could cause frostbite on exposed skin in as little as 10 minutes," the weather service said in its advisory. "Use caution while outside. Wear appropriate winter clothing."
The blizzard warning is in effect for areas of the Red River Valley in eastern North Dakota and western Minnesota, including the cities of Fargo, Moorhead, Grand Forks, Valley City and Wahpeton, until 9 p.m. on Tuesday.