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A cloudy and warm March
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    March, 2007, was cloudier and warmer than normal.  The mean cloud amount was 84% against a normal of 76%.  The mean minimum temperature of 18.4 degrees was 1.9 degrees higher than normal, the eighth highest for the month.  The monthly rainfall of 27.6 millimetres was about 59% less than the normal figure of 66.9 millimetres.  The accumulated rainfall in the first three months of the year was 64.1 millimetres, about 54% below the normal figure of 138.3 millimetres for the same period.

     Under the influence of the northeast monsoon, it was mainly cloudy with a few light rain patches on the first day of the month.  As the northeast monsoon was replaced by a maritime airstream, it was warm with sunny periods on March 2 and the following two days. After the passage of a cold front across the coast of Guangdong on the morning of March 5, the weather became cool with some rain that night.  It was rainy and rather cool on March 6.  The temperature dropped further to 10.6 degrees on the morning of March 7, the lowest in the month.  The weather stayed cool with a few rain patches on March 8 and 9.

     A humid maritime airstream affected the south China coast again on March 10 and 11, bringing foggy weather to Hong Kong.  The visibility at the Hong Kong International Airport fell below 1000 metres.  Humid and misty weather persisted in the next four days.  It was warm with sunny periods on March 16.

     The arrival of a cold front brought a few rain patches to the territory on March 17.  The weather became cooler in the ensuing four days.  A broad cloud band over southern China brought cloudy weather to Hong Kong on March 22 and 23.  The weather became warm with some mist and rain on March 24 and the following three days as Hong Kong came under the influence of a maritime airstream.  With sunny periods during the day, the temperature rose to 27.8 degrees on March 27, the highest in the month.

     It was cloudy with winds freshening from the east on March 28.  The clouds thinned out and there were sunny periods next day.  The weather remained warm with sunny periods in the last two days of the month.

     Only one tropical cyclone occurred in the western North Pacific in the month.
 
     Details of the issuance and cancellation of various warnings/signals in the month are summarised in Table 1.  Monthly meteorological figures and departures from normal of March are shown in Table 2.

Ends/Tuesday, April 3, 2007
Issued at HKT 15:35

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