The Pacific, North American pattern

The Pacific, a North American pattern (たいへいよう, Hokubei pattern, Pacific - North American pattern: PNA) is a tele connection pattern to have in an area between western part of Pacific and the North American Continent. The climate of a large number of blocks changes with each other.

Originally I am discovered while I study the influence on climate of the North American Continent with El Nino, the south vibration (ENSO) and am the phenomenon that has been elucidated. The spread pattern of the loss B wave changes with the area where a tropical convection is prosperous moving, and a high atmospheric pressure zone and a low pressure Zone appear in turn towards North America from the Indonesian sea near the shore. This causes the abnormal weather such as a high temperature and low temperature, a heavy rain and the drought.

The PNA index that NOAA calculated calculated a flat yearly variation of the 500 hPa altitude (atmospheric pressure is high so that this is high at the altitude that atmospheric pressure becomes 500 hPa) for numerical value of numerical value - 25-35 degrees N, 90-70 degrees W of numerical value + 45-60 degrees N, 125-105 degrees W of numerical value - 40-50 degrees N .180 - 140 degrees W of 15-25 degrees N .180 - 140 degrees W W.

Source

• PNA pattern (weather vocabulary)
• Pacific/North American Pattern (NOAA CPC)

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