tag:blogger.com,1999:blog-4572286363399496963.post7127228183289198323..comments2024-03-28T07:09:59.093-08:00Comments on Deep Cold: Alaska Weather & Climate: Duration of Cold SpellsRickhttp://www.blogger.com/profile/03946704894714514716noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-4572286363399496963.post-20044524860682128972017-01-30T12:55:42.705-09:002017-01-30T12:55:42.705-09:00In the meantime here's an interesting weather ...In the meantime here's an interesting weather site that offers analyses of historical annual climate for Alaska. Select the location then the decade and year of interest. <br /><br />https://weatherspark.com/history/stations/United%20States/Alaska<br /><br />GaryNL7Yhttps://www.blogger.com/profile/15874712728971005352noreply@blogger.comtag:blogger.com,1999:blog-4572286363399496963.post-52760291922550492612017-01-28T08:21:11.243-09:002017-01-28T08:21:11.243-09:00"A detailed answer would require analysis of ..."A detailed answer would require analysis of the circulation patterns during the coldest episodes in Fairbanks - a project for another time."<br /><br />We'll await your efforts if you can find the time and energy.<br />Gary NL7Yhttps://www.blogger.com/profile/15874712728971005352noreply@blogger.comtag:blogger.com,1999:blog-4572286363399496963.post-90964075125783411562017-01-28T08:00:54.349-09:002017-01-28T08:00:54.349-09:00As a hint, high pressure has been increasing over ...As a hint, high pressure has been increasing over time north of Alaska.<br /><br />http://ak-wx.blogspot.com/2014/05/upper-level-blocking-highs.html<br /><br />http://ak-wx.blogspot.com/2014/05/upper-level-cut-off-lows.htmlEric Lundellhttps://www.blogger.com/profile/17914784378747801359noreply@blogger.comtag:blogger.com,1999:blog-4572286363399496963.post-39166499014253403882017-01-27T23:22:35.378-09:002017-01-27T23:22:35.378-09:00Yes, and thank you Richard for undertaking the ana...Yes, and thank you Richard for undertaking the analysis. <br /><br />The stable cyclonic flow in NE Alaska and Canada is one means if cold advection is to come visiting Interior Alaska for extended periods. So may be anti-cyclonic flow from NW of Alaska that advects Siberian cold and is supported by low pressure to the SE. Not sure which tends to linger longer.<br /><br />If I look here I see a cold airmass over northern Canada most winters. When is moves west we get chilled. There may be other better models:<br /><br />http://www.weatherstreet.com/states/gfsx-sfc-temperature-and-wind-forecast.htm<br /><br />So I wonder...are prolonged cold spells best initiated and supported by:<br /><br />NW flow from Siberia?<br />SW flow from northern Canada?<br />A cold ridge airmass above that contributes to clear skies that promote the loss surface heat?<br />Or, as we just experienced, a trough that's cold at heights above ground?<br /><br />Maybe all or a mix of the above?<br /><br />Gary<br /><br />NL7Yhttps://www.blogger.com/profile/15874712728971005352noreply@blogger.com