Sheoaks Forecast Meteograms

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About Weatherzone Meteograms

Meteograms are a means of displaying a computer model forecast for a certain point within the domain over which the model runs. They compliment charts which show output over the whole domain (or part of the domain) for one time step.

Roll over the vertices on the meteograms with your mouse to see numeric values.

The GFS model output comes at a resolution of 1° meaning many places with relatively different climates may lie within the same grid cell.

A computer model operates by dividing the atmosphere into grid cells which may be quite large so it's important to factor the spatial resolution of the model into your interpretation of the output (see below).

In addition, different models output data for different time steps. Using a model with an output time interval of 6 hours a temperature of 20° at analysis time and a predicted temperature of 15° six hours later will be displayed with a line between the two but of course there may be fluctuations between those times (a spike to 25°, for example) which will not be reflected.

A meteogram shows the general nature of what may be experienced within the area in which the point lies, over time. Some local knowlegde (the likely effects of elevation and terrain in a certain weather pattern, for example) will help you refine this guidance.

See the weather glossary for definitions of terms used on this page.

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Rainfall to soak some parched areas of WA

13:00 AEST Rain could finally fall over parts of southwestern WA over the next week, wetting areas that have barely seen any rain for months. This rainfall will be caused by a low pressure trough extending from the Kimberley down to southwestern WA from late Thursday, with a low pressure system developing within it early to mid-next week. The images below shows that widespread rainfall of between 15 to 30mm is forecast in the week across western and southern WA, with isolated falls of between 40 to 60mm in the Gascoyne and Goldfields districts. Image: Accumulated rainfall to 8pm AWST on Thursday, May 2, according to Access (top) and ECMWF (bottom) You can see there is still some uncertainty about where and how much rainfall will fall in these areas late this week and early next week, with one model placing rain over Perth and the other predicting it will completely miss the city altogether. The heaviest rainfall days are likely to be Friday and mid next week when the low pressure system develops.