"...estimate that the Tonga eruption sent around [146 million metric tons] of water vapor into Earth’s stratosphere – equal to 10% of the water already present

"...estimate that the Tonga eruption sent around [146 million metric tons] of water vapor into Earth’s stratosphere – equal to 10% of the water already present in that atmospheric layer." Is this one of the reasons why winter's been so weird this year in North America? I've heard of El Nino as being the suspected cause, but this sending of water vapor into the air also must have had long-term effects.