If the bearing spins inside its home in the large end of the connecting rod, oil pressure will first go up, due to less flow of oil where there normally would be. (mechanics.stackexchange.com)
That the Pacific phenomenon involve upwelling suggests that more or less flow in cold currents — the Peruvian and Californian Currents — displace more or less of the overlaying warm ocean layer. (watertechbyrie.com)
Another catalyst can be found in the surge in WTI oil due to tighter inventories corresponding with less flow through the Keystone pipeline from Canada. (cnbc.com)