Bobgram

Bob McDavitt's ideas for sailing around the South Pacific. Disclaimer: Weather is a mix of pattern and chaos; these ideas are from the patterned world. Compiled 05 July 2026 A review of last month's weather Here is a link to a YouTube clip giving an animated loop of the isobars and streamlines For last month is at youtu.be/9vEKSmPOgQc Most of the month there where anticyclones along 30 to 40S . In New Zealand it was the warmest June on record. On June 25 a deep low crossed northern NZ The resulting southerly winds triggered an evacuation of Wellington's south coast and power cuts affecting 6500 homes around Taranaki/Whanganui and 4000 in Wellington. Sea Surface temperature anomalies from psl.noaa.gov/map/clim/sst.shtml The waters over eastern equatorial Pacific are warming --- El Nino has started. A warm pool is stretching eastwards along the Aleutians towards Alaska. There has been a cooling trend around Fiji. Average isobars for past month (From www.psl.noaa.gov/map/images/fnl/slp_30b.fnl.html) The Monsoon has arrived over southern India around normal. Not much change elsewhere. Pressure anomalies for past two months (from www.psl.noaa.gov/map/images/fnl/slp_30b.fnl.html) The anomaly pressure pattern for last month now shows a low breeding area northeast of New Zealand and another around Easter Island. The low breeding area that was over New Caledonia has now faded. The 1015 isobar has shifted north over northern Australia . TROPICS .One person was killed and three injured in eastern Japan by severe conditions created by Tropical Storm Higos and former Typhoon Mekkhala, which struck in rapid succession. . Tropical Storm Bavi formed near the Marshall Islands and is on track to strike the Northern Mariana Islands or Guam as an intense typhoon. WEATHER ZONES There has been a multi-centred low NE of New Zealand and south to southeast of southern Cooks for past few days. This system is now being pushed to the southwest and fading. An associated convergence zone is expected to travel east across the Society island early this week. Otherwise, the SPCZ is rather weak, with one section near Samoa and another section over the Solomon Islands. High H1 is slow-moving at 43S well east of NZ. A complex and muti-centred low system is forming under a cold pool over New Zealand expected to be slow-moving until mid-week then travel off to southeast followed by cold southerly flow on Thursday. The FRONT associated with this system is expected over Minerva late on local Tuesday. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> If you would like more details about your voyage, check metbob.com Or Facebook at /www.facebook.com/metbobnz/ Weathergram with graphics is at metbob.wordpress.com (subscribe/unsubscribe at bottom). Weathergram archive (with translator) is at weathergram.blogspot.co.nz. Contact is bob@metbob.com or text 64277762212. >>>>>>>>>>>>>>>>