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Mt Washington was briefly in Stratosphere last week
[SmithsonianMag] As extremely cold temperatures gripped the northeastern United States and southeastern Canada over the weekend, New Hampshire's Mount Washington endured record-breaking conditions. On Friday, the wind chill at the top of the peak reached minus 108 degrees Fahrenheit, which is likely the lowest wind chill ever recorded in the history of the nation, report CNN's Ralph Ellis and Aya Elamroussi.....on Friday, part of the next-lowest atmospheric region, the stratosphere, dipped so low that the mountain's summit and any surrounding areas above 4,000 feet in elevation were actually in that layer instead. As the atmosphere cools down, it becomes more compressed, causing the boundary between the troposphere and the stratosphere to drop. The stratosphere is typically 4 to 12 miles above the surface of the Earth, but some of it sank to less than a mile above the surface on Friday, Terry Eliasen, a meteorologist with Boston's WBZ-TV, wrote in a tweet. --- looking at the data, the above the stratosphere time was pretty brief, about an hour or two between 11pm Fri and 1 am Saturday -the wind direction changed from NW to W during this period and then changed back to NW a stratosphere event like this probably has happened before but this time a chunk of the polar vortex passed over an area with an observation point Posted by: lord garth 2023-02-07 |
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