National Hurricane Center Tracks Four Potential Tropical Cyclones in Pacific The National Hurricane Center is closely monitoring four distinct areas in the central and eastern Pacific Ocean, all of which could develop into tropical cyclones by early September. Three of these regions have at least a 70% chance of producing a storm, with two overlapping zones southwest of Mexico showing the highest likelihood. The Pacific has become a hub for storm activity, with the east Pacific already experiencing its 10th named tropical storm of the year, Tropical Storm Julio, which formed about 10 days earlier than usual. This surge in activity has brought the basin close to its annual average of 15 storms, with three months of hurricane season still remaining. El Niño is a dominant factor driving this increased activity. The phenomenon has warmed the tropical Pacific to record levels, creating ideal conditions for frequent storm development. The National Hurricane Center noted that El Niño is so strong it is "drowning out" the Madden-Julian Oscillation, a regular weather pattern that typically influences cyclone activity in the central and east Pacific. Normally, the MJO causes fluctuations in storm frequency every two to six weeks, but El Niño’s effects have led to nearly continuous thunderstorm activity. These persistent storms provide the necessary energy for tropical cyclones to form, with the "hot spot" expected to persist through early September. While most storms are likely to remain far from land, Hawaii and California face potential impacts. The central Pacific, particularly near Hawaii, has seen more energetic storm activity than the entire Atlantic basin this year.#hawaii #el_nio #madden_julian_oscillation #national_hurricane_center #tropical_storm_julio
El Nino May Emerge Between May and July Climate models suggest El Nino could develop between May and July 2026, with uncertainty surrounding its timing and intensity. Scientists from Australia’s Bureau of Meteorology (BoM) and other global institutions indicate that while some models predict an earlier onset, others suggest a more gradual transition. The key factor influencing this uncertainty is the interaction between oceanic and atmospheric conditions, which determines whether the El Nino-Southern Oscillation (ENSO) will fully materialize. The ENSO system is currently in a neutral phase, but recent data shows a warming trend in the tropical Pacific. The Nino3.4 index, a critical indicator of Pacific Ocean temperatures, stood at -0.27°C for the week ending April 12, remaining within the neutral range. However, this index has been rising steadily since the end of the southern hemisphere summer, driven by sub-surface warming. This warming is expected to push sea surface temperatures higher in the coming weeks, potentially triggering El Nino conditions. Short-term atmospheric signals also support the warming trend. The Madden-Julian Oscillation (MJO), a recurring weather pattern, is forecast to bring westerly wind anomalies across the western Pacific in the next fortnight. These winds typically enhance ocean warming, further contributing to the likelihood of El Nino. Meanwhile, the 30-day Southern Oscillation Index has dropped to -7.7, reflecting shifting pressure patterns in the Pacific. However, longer-term indices remain positive, indicating a broader warming trend. The Indian Ocean Dipole (IOD) is currently neutral, with an index of +0.06°C.#indian_ocean_dipole #el_nino_southern_oscillation #australia_bureau_of_meteorology #madden_julian_oscillation #apec_climate_center
