Navigation

    Windy Community

    • Register
    • Login
    • Search
    • Unread
    • Categories
    • Groups
    • Go to windy.com

    Antarctic High Pressure does not seem credible

    Bug Reports
    3
    5
    477
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • af4ex
      af4ex last edited by

      Currently in East Antarctic I am seeing two high-pressure domes with 1060mb and 1067mb, resp. (I didn't think such pressures are possible on Earth). In West Antarctic I am seeing domes labeled 'H', with 998mb and 991mb. which seem too low. (I have the Pressure switch enabled)
      Is this a bug?
      I have screen shots which I can send you.

      Gkikas LGPZ idefix37 2 Replies Last reply Reply Quote 0
      • Gkikas LGPZ
        Gkikas LGPZ Moderator @af4ex last edited by Gkikas LGPZ

        @af4ex
        https://earth.nullschool.net/#current/wind/surface/level/overlay=mean_sea_level_pressure/orthographic=0.16,-87.08,272/loc=93.173,-81.646

        GFS confirms 1068 hPa

        d3b9bf7f-1ace-4925-a543-d2665d2e1090-εικόνα.png

        We must mention that Antarctica is always dominated by high pressure.
        Meaningful analysis of surface pressure is difficult because of the elevated nature of much of the continent.

        1 Reply Last reply Reply Quote 1
        • idefix37
          idefix37 Sailor Moderator @af4ex last edited by idefix37

          @af4ex
          These 991 or 988 hPa are « relative » high pressure compared to the environment lowest pressure.

          3DD02975-BF42-4F8E-9FA8-89CCBFEBC0E4.jpeg

          1 Reply Last reply Reply Quote 1
          • af4ex
            af4ex last edited by af4ex

            "...« relative » high pressure..."

            Yes, I am aware that these are relative readings. But it seemed really unusual to me that a dome having pressure above 1060mb was covering the entire East Antarctic subcontinent, while West Antarctic was displaying "high" pressure areas below 1000mb!
            I believe the highest pressure ever recorded in the U.S. was only 1059mb
            Thanks,
            John/af4ex

            idefix37 1 Reply Last reply Reply Quote 0
            • idefix37
              idefix37 Sailor Moderator @af4ex last edited by idefix37

              @af4ex
              During the cold season, here the austral winter, there are currently high pressures over the pole.
              In NH they bring the typical Siberian anticyclone with high pressure figures.
              See « Records » in:
              https://en.m.wikipedia.org/wiki/Atmospheric_pressure
              So 1060 hPa is not unusual in polar region.
              This thermic anticyclone is not perfectly centred on the pole itself as shown by @Gkikas-LGPZ

              1 Reply Last reply Reply Quote 1
              • First post
                Last post
              Windyty, S.E. - all rights reserved. Powered by excellent NodeBB
              NodeBB & contributors, OSM & contributors, HERE maps
              Terms and Conditions     Privacy Policy