Surface Pressure Charts

These charts show the surface pressure pattern using isobars (lines of equal pressure) and indicate areas of high (H) and low pressure (L) along with their central pressure value. Isobars are represented by solid lines. Fronts are also displayed.

An actual analysis chart is issued along with forecast charts out to five days ahead. These are updated every 12 hours around 0730 and 1930, with the exception of charts for days four and five which are only issued once per day at 0730.

本图表展示了利用等压线（相同气压的线条）描绘的表面气压分布模式，并标示了高压区（H）和低压区（L）及其中心气压值。等压线以实线表示。同时，还展示了锋面信息。实际分析图表与五日内的预报图表一同发布。这些图表每12小时更新两次，分别在0730和1930进行更新，但第四天和第五天的图表仅于每日0730发布一次。