October 2024 - Page 5 of 11 - Climate Impact Company

News

10/21/2024, 5:37 am EDT

Record Strength and Length of -PDO Regime Despite Warm Northeast Pacific!

Another hotter than normal summer and early autumn in California thanks in large part to the emergence of Marine Heat Wave NEP24A which started last April offshore and spread into the U.S. West Coast and intensified during the summer season. As usual, the presence of the MHW helped amplify an upper-level high-pressure ridge to cause the hot summer. One fascinating aspect of MHW24A is the persistent and strengthening cool phase of the Pacific decadal oscillation (PDO), normally present when the Northeast Pacific Ocean surface is cooler than normal.

10/16/2024, 2:31 pm EDT

Marine Heat Waves Remain Dominant and Continue Climate Influence

Marine heat waves continue to produce significant influence on where semi-permanent high-pressure areas form alongside their compensating low-pressure areas. Many MHW’s are ongoing in the northern hemisphere, the strongest east of Japan. Regenerating MHW’s are likely during the southern hemisphere summer in the subtropical/middle latitude oceans. The extensive warming of the ocean caused by MHW’s is likely suppressing La Nina onset.

10/16/2024, 9:40 am EDT

Heavy Rains Southern Brazil While Northern Brazil Becomes Hot/Dry

Weak upper trough cuts off over Southwest Brazil propelling a heavy rainfall episode this week through next week. Significant relief to the long-term drought is certainly implied. ECM "weeklies" ease but do not end the Southern Brazil into early November. Northern Brazil becomes the focus of hot and dry weather.

10/16/2024, 8:52 am EDT

Explaining The Recent Spike in Negative Phase Indian Ocean Dipole

The recent reversal in the IOD pattern to negative phase is quick and sharp. Climate Impact Company explains this sudden change due to expansion of a marine heat wave off the northwest coast of Australia into the eastern Indian Ocean tropics. Some dynamic models maintain this trend, others prefer this sudden shift as temporary.