AWN synoptic weather chart for
South Atlantic Ocean
Friday 1 December 2023, 11pm EDT: Thunderstorms and power outages during the past week have made my main weather processing computer unserviceable. Processing is being transferred to a backup computer but may take some time as systems are tested.
OCF forecasts are being updated, but are currently run manually so may be behind normal schedule.
The Daily Weather Summary and climate data will follow as soon as possible.
Updates will be posted in this yellow box.
01/01/21: World Weather Maps are no longer being produced due to the considerable overheads involved in their running and maintenance.
Updated about 25 minutes past each hour Because most charts span multiple time zones, all charts use UTC (GMT). Current UTC is at right.
Current times across this chart and in Australia from timeanddate.com
For detailed time zone maps go here or here.
See here for DST exceptions
*One hour earlier during winter half
Nominal Time UTC
Australian clock time. The charts marked ** are 1 day ahead of UTC.
Surface chart one-month archive Each chart is for the same clock time across Australia. Western Australian observations are 2 hours behind those in eastern Australia (3 hours during daylight saving time).
Check the chart is current. For the latest hourly chart, the date/time in the "generated" box in the top left corner of the chart should be at most 90 minutes behind the "Time Now UTC" shown next to the Latest hourly chart link.
All charts open in new windows. You can click between charts to make comparisons. AWN's charts are large, and most browsers in their default settings will resize the image to fit the screen. Click on any part of the chart to enlarge it.
For one-click access to latest chart for an area , click the in the full list of charts.
A rough guide to the main time zones across the chart is given in the bar under the Latest hourly chart link and there's more information in Area Notes below. This map shows all world timezones and the time in them now - click anywhere for a more detailed map. This map shows where daylight saving time is used and now operating (yellow), used and not operating (green) and not used (grey).
Surface charts show pressure isobars in red, temperature isotherms in green (but 0° in dark blue, +30° in orange, -30° in purple), and wind streamlines in grey. Light green shading shows areas with relative humidity above 80%, light yellow below 20%. Exceptions are noted in the Area Notes below.
Observations for each station are plotted around its location as shown in the observation rose at right. The location is marked by a circle which contains a symbol for amount of cloud or "+" for an AWS not observing cloud. A wind shaft and feathers show the direction and speed of wind blowing into the station. The sample plot at right may help reading clockwise from the top. The station name is Eskdalemuir (only the first 10 letters are given), and the Weather symbol (3 dots) shows continuous moderate rain is falling. The barometer is 998.3 hPa, and the symbol showing barometer trend indicates it fell a bit then rose1.2 hPa in the past 3 hours. 3.0mm of rain has fallen in the past 12 hours, while in the past 24 hours the minimum temperature has been 9 and the rainfall 13.0mm. Currently, visibility is 30km, the dew point is 9 and the temperature 10.4. Learn more in the help section on synoptic plots.
More information on the observation practices in different countries will be found in Area Notes below.