Meteorologists have known about the polar vortex for more than 100 years, but the term became popularized in 2014, when back-to-back intrusions by lobes of the vortex chilled Americans in January and February. {code: 'ad_topslot_b', pubstack: { adUnitName: 'cdo_topslot', adUnitPath: '/2863368/topslot' }, mediaTypes: { banner: { sizes: [[728, 90]] } }, { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_SR' }}, iasLog("criterion : cdo_tc = resp"); Sfrutta tutte le potenzialità offerte da Cambridge Dictionary aggiungendo al tuo sito web i nostri widget gratuiti per la casella di ricerca. { bidder: 'openx', params: { unit: '539971079', delDomain: 'idm-d.openx.net' }}, bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776156', position: 'atf' }}, { bidder: 'openx', params: { unit: '539971065', delDomain: 'idm-d.openx.net' }}, { bidder: 'appnexus', params: { placementId: '11654156' }}, name: "_pubcid", syncDelay: 3000 { bidder: 'openx', params: { unit: '539971066', delDomain: 'idm-d.openx.net' }},
These gradients drive winds, leading to a pattern of low pressure that circulates counterclockwise around the pole.

In each case, the vortex strengthens during winter and weakens during summer. var mapping_btmslot_a = googletag.sizeMapping().addSize([746, 0], [[300, 250], 'fluid']).addSize([0, 0], [[300, 250], [320, 50], [300, 50], 'fluid']).build(); These are not the main drivers of the winter patterns (as the weather is not so simple), but are aiming for the top positions. The jet stream exists because of the big temperature difference between the Arctic and the warmer areas beneath the poles.

Below are example images from the great SSW analysis site at ESRL/NOAA, which shows two examples of winters with an SSW event. You may have questions about how we can possibly be due for another cold snap, or what we did to deserve this kind of treatment from the universe.

googletag.pubads().setTargeting("cdo_c", ["science_geographic_locales"]); During winter, the polar vortex at the North Pole expands, sending cold air southward. Inverse is here to help. It is currently in positive values, which reveals that westerly winds are prevalent. NWS Please Contact Us.

This might not mean much for now, but it shows that the polar vortex is off to a more sleepy start. "Our weather happens in the lower level of the atmosphere, and this occurs just right above that lower level.”. { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_SR' }}, } It packs a lot of energy, a lot in the form of wind and/or rotational energy. 'min': 0, “With respect to climate, a strong polar vortex occurs when it is particularly cold at higher latitudes. Well, bundle up — because the dreaded polar vortex can quickly make winter weather even colder than usual. All NOAA. { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_rightslot2' }},

{code: 'ad_btmslot_a', pubstack: { adUnitName: 'cdo_btmslot', adUnitPath: '/2863368/btmslot' }, mediaTypes: { banner: { sizes: [[300, 250]] } }, This jet stream is usually referred to as the polar night jet. The one that occurred January 2014 is similar to many other cold outbreaks that have occurred in the past, including several notable colder outbreaks in 1977, 1982, 1985 and 1989. We can see on the latest data for September at the end of the graphic, that positive values are starting to emerge, corresponding to a west phase.
'increment': 0.5, googletag.pubads().setTargeting("cdo_pc", "dictionary"); Please refresh the page and try again. { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_rightslot2_flex' }}, }; "It's actually in the stratosphere," Pugh said.

Still, it's true: While outlier events, polar vortexes can still happen this time of year. This is why the state of the stratospheric polar vortex is important, as well as the phase of the QBO. var mapping_houseslot_a = googletag.sizeMapping().addSize([963, 0], [300, 250]).addSize([0, 0], []).build(); NY 10036. { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_btmslot' }}]}, Right, haven't I encountered these before? { bidder: 'appnexus', params: { placementId: '11654156' }}, The solar input to the north pole decreases as the angle of incoming solar rays reduces. {code: 'ad_topslot_b', pubstack: { adUnitName: 'cdo_topslot', adUnitPath: '/2863368/topslot' }, mediaTypes: { banner: { sizes: [[728, 90]] } }, params: {

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