Monthly Rainfall 2015 – Station KH6DK Aiea Hi Eleve 522


2015 started out mainly dry here at my location near elevation 520 feet in Aiea until the hurricanes and tropical storms of August brought major rainfall events from the large areas of moisture surrounding them.  September rain came with  tradewinds rather than cyclones.  2015 was an El Nino year, possibly the strongest of a rather short record, with the highest number of hurricanes in the Hawaii region in memory during the hurricane season.

My November notes attribute the rainfall to a Kona type event ( a term that’s fallen into disuse due to the advent of satellite imagery and more moder synoptic  weather terminology  ) – cold fronts associated with subtropical cyclone activity that stalled putting Hawaiian Islands in a southerly wind field with lots of rain over a few days.

December received rainfall from strong trades.  Despite this influx, newspaper reports drought conditions in West Hawaii Island and other – mainly leeward areas elsewhere.  Forecast for the winter – drought.

aieafield vs kh6dk.PNG

Above: comparison of KH6DK with average monthly rainfall at Aiea Field 625 (1949-1970), probably an Aiea Plantation Weather station with records on the website.

Below the deviation of KH6DK 2015 from the Aiea Field 625 “norm”.   This is not a valid comparison since we don’t know some particulars about Aiea Field 625 , like its elevation and whether it was a wetter or drier station than KH6DK….  From this graph we’d surmise that 2015 was drier than normal – and it was – drought pretty much everywhere in Hawaii, and then the el Nino hurricanes – we were lucky to have just close calls but little impact aside from some wet conditions.


About station KH6DK – I call it this because it’s my ham callsign which is a likely handle for my projects in the future.  The raingage is a weathered plastic Taylor graduated cylinder type, that I’ve had for over 30 years.  I don’t record daily rainfall but tend to go by either weekends if rain is steady but small, or by events, to prevent overflow.  The gage capacity is five inches (200 ml).  There was one overflow event – the full gage is about 240ml – 6″ +-.


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