Isobars:
Isobars, lines of equal atmospheric pressure, are drawn every 4hPa
(hectopascals or millibars). Areas of High and Low pressure are indicated.
Rainfall: Rainfall accumulated over 6 hours. The deeper the shade of
blue, the heavier the rainfall. Some regions of very light rainfall may not be
indicated.
Cloud: Computer generated cloud using fractals shows the extent of
predicted cloud amounts.
Temperature: Areas of warmer and cooler air are represented by red and
blue shades respectively.
| These charts come from
a computer model of the weather called Hirlam. These are the same charts used
as guidance by the weather forecasters. The forecasters, however, will also
take into account the latest satellite and radar imagery, and the latest
weather station reports, in producing the forecast. These charts, therefore,
may not always be consistent with the official forecasts as shown on the
"Detailed Forecast" and "Regional Forecast" pages.
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