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Sept-Oct 2009

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Forecast Center

Siberia is well known in popular culture as the icebox of the north. The coldest temperature in the northern hemisphere was recorded at Oymyakon, located in inland Siberia, which bottomed out at -90°F in February 1933. Summer brings warmth and an abundance of active weather systems. Analyzing fronts in this part of the world provides excellent practice for those who are accustomed to the predictable patterns often found in the United States and Canada. Fortunately, the fundamentals of meteorology don’t change based on international borders, and all the same rules outlined in past issues of “Forecast Center” still apply.

This weather map depicts a weather situation during the early evening in July. Draw isobars every 4 millibars (996, 1000, 1004 mb, etc.) using the plot model example at the lower right as a guide. As the plot model indicates, the actual millibar value for plotted pressure (xxx) is 10xx.x mb when the number shown is below 500, and 9xx.x when it is more than 500. For instance, 027 represents 1002.7 mb, and 892 represents 989.2 mb. Therefore, when 1 station reports 074 and a nearby one shows 086, the 1008 mb isobar will be found halfway between the stations. Then try to find the locations of fronts, highs, and lows.

For further information, along with helpful hints and advice, visit

The solution appears on page 65.

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