tag:blogger.com,1999:blog-4572286363399496963.post5225609372204312047..comments2024-03-28T07:09:59.093-08:00Comments on Deep Cold: Alaska Weather & Climate: Cold During Positive PDORickhttp://www.blogger.com/profile/03946704894714514716noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-4572286363399496963.post-78622946410140381322015-11-22T20:21:19.234-09:002015-11-22T20:21:19.234-09:00Maybe on a greater scale some Rossby Wave forcing ...Maybe on a greater scale some Rossby Wave forcing via ENSO or PNA phases moved and flattened the Jet south of Alaska for a period, allowing clearing and cold air to advect SE across Alaska?<br /><br />GaryNL7Yhttps://www.blogger.com/profile/15874712728971005352noreply@blogger.comtag:blogger.com,1999:blog-4572286363399496963.post-28205226850195771572015-11-22T17:37:47.761-09:002015-11-22T17:37:47.761-09:00Gary, yes indeed the flow pattern brought in the c...Gary, yes indeed the flow pattern brought in the cold air and the ocean temperatures had little to do with it. The interesting aspect is that the large-scale ocean anomaly tends to make such a flow pattern less likely; a positive PDO shifts the typical flow pattern in the direction of importing warm, not cold. At least that's how I interpret the effect.<br />Richard Jameshttps://www.blogger.com/profile/08313902028896263276noreply@blogger.comtag:blogger.com,1999:blog-4572286363399496963.post-76186456396340135452015-11-21T21:23:05.326-09:002015-11-21T21:23:05.326-09:00As I vaguely recall, a CCW Low (upper/lower/?) mov...As I vaguely recall, a CCW Low (upper/lower/?) moved across the State ~E>W and the cold was advected in from the NW...I assume Siberia. <br /><br />Not much a positive PDO can do in the short term if the upper level dynamics support a NW flow of cold air. Plus it cleared off so radiational cooling took effect. <br /><br />Clouds are my friend in winter.<br /><br />GaryNL7Yhttps://www.blogger.com/profile/15874712728971005352noreply@blogger.com