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El Niño's Grip Tightens on Atlantic Hurricane Season
23 Jul
Summary
- El Niño strengthens upper-level winds, increasing wind shear.
- Higher wind shear hinders tropical storm development and intensity.
- This year's El Niño's impact appears earlier than usual.
Powerful upper-level winds, known as wind shear, are actively dismantling Tropical Storm Bertha. This phenomenon is a key indicator of El Niño's impact on the Atlantic hurricane season. El Niño, a warming of Pacific waters, alters global atmospheric circulation, strengthening upper-level winds over the Atlantic and Caribbean.
This increased wind shear acts as a significant obstacle for tropical storm development. It tilts nascent storms, disrupts their core, and impedes the moisture and heat needed for intensification. Consequently, storms are more likely to weaken or fail to organize, potentially leading to fewer major hurricanes.
While the specific wind shear affecting Bertha may stem from a Midwestern high-pressure system, experts note that the broader El Niño's influence is manifesting earlier than typical. This early onset, potentially linked to rapid Pacific warming, suggests continued high shear across the Caribbean and tropical Atlantic.
Forecasters anticipate a below-normal 2026 Atlantic hurricane season due to El Niño's effects. Projections, such as those from Colorado State University, indicate fewer named storms than the historical average. The ongoing high wind shear in crucial storm-forming regions reinforces expectations of a less active season.
