Oil prices surged in late-day trading on Feb. 3, sending the U.S. crude benchmark WTI through $90/bbl for the first time since 2014 due to ongoing supply worries and as frigid weather cascades across the United States.

Global benchmark Brent crude settled at $91.11/bbl, up $1.64, or 1.8%, while WTI crude soared $2.01, or 2.3%, higher to end at $90.27/bbl, the first time the U.S. benchmark has closed above the $90-level since Oct.6, 2014.

Analysts attributed the late rally to growing concerns that extended cold weather could hit production in Texas, exacerbating the tightness in world crude markets.

More than 200,000 people have lost power across the U.S. due to the cold thus far, and recollections of Storm Ida a year ago that knocked out power to millions of Texans, remain at the fore.

“It’s hysteria or a kind of fear,” said Bob Yawger, director of energy futures at Mizuho. “In the last hour, the talk has started to drive [oil] higher.”

The market was also watching developments between Russia and the West over the former’s aggressive posture towards Ukraine.

The U.S. warned that Russia was planning to use a staged attack as justification for invading the neighboring nation. Russia’s President Vladimir Putin has blamed NATO and the West for increased tensions, even as he has moved thousands of troops near to Ukraine’s border.

“The tensions around the Ukraine conflict are providing support, and we have growing global demand and we’re not really ramping up supply to meet it,” said Gary Cunningham, director of market research at Tradition Energy.

Crude benchmarks have been pointing upward for weeks on expectations that supply will tighten further even after OPEC+ producers stuck to planned moderate output increases. Demand remains on the upswing, with the Omicron coronavirus variant only temporarily denting consumption in major economies.

OPEC and allies led by Russia, known as OPEC+, this week agreed to stick to monthly increases of 400,000 bbl/d in output despite pressure from consumers to raise supplies more quickly.

Goldman Sachs analysts forecast Brent topping $100/bbl in the third quarter. The brokerage had predicted that OPEC+ may consider a faster unwinding of its production cuts.

Several OPEC members are struggling to pump more despite prices being at seven-year highs.

Iraq pumped 4.16 million bbl/d of oil in January, below its limit of 4.28 million bbl/d under the OPEC+ deal, data from state-owned marketer SOMO seen by Reuters showed.

Analysts have looked to U.S. output as a salve, though production slipped to 11.5 million bbl/d in the most recent week, and is far off the 2019 record of 12.3 million bbl/d, according to federal data.

ConocoPhillips CEO Ryan Lance, however, said high prices may lead U.S. oil producers to add production too quickly, leading to oversupply.

“If we are getting back to the level of growth in the U.S.” comparable to the 2014-2015 shale boom, said Lance, and “if you’re not worried about it, you should be,” he told investors during a conference call.