Re: La ~ Nina and her effect on the Australian storm season / General weather

March weather records for Blacktown

The month of March will conclude this topic.

During the month there were 9 days when the maximum temperature reached 30C taking the final tally to 59 for the season 1 October to 31 March. A near normal season occurred in terms of the number of 30C days. There were 2 thunderstorms with one occurring on 21 March which was weak and another on 30 March. It rained on 10 days but the final rainfall tally will not be known. The weather station at Collins Street Seven Hills quoted here so often appears to have malfunctioned on 19 March and was not operational until 1 April. However there were good rains during the period 19 March to 22 March following a dry start to the month.

The second table provides the number of thunderstorms experienced in my local area since 1998/1999 for the period 1 October to 31 March each year. When looking at the table it is hard to identify a trend. It seems that each season is different. The 1998/99 La Nina produced few thunderstorms for my local area but the 2007/08 La Nina produced many thunderstorms. During the 2010/11 La Nina period, there were 15 thunderstorms on 11 days but I noted that many storms were weak and had little adverse impact.

The tables referred to are provided below. Table one provides the monthly records for Blacktown and Table 2 provides the number of thunderstorms experienced in my local area commencing with the 1998/1999 season. Each season is from 1 October to 31 March. Some additional comments are provided below each table.

Harley Pearman

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