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Hurricane Debbie: Scientists Tamper with Storms?
3 Sep
Summary
- Scientists dropped burning silver iodide into Hurricane Debbie's eyewall.
- Peak winds dropped 31% after the first seeding attempt.
- Later analysis suggested natural storm changes, not seeding, caused wind drops.
In August 1969, U.S. scientists conducted an experiment named Project STORMFURY, aiming to weaken Hurricane Debbie by seeding its eyewall with burning silver iodide. The first seeding on August 18 saw Debbie's peak winds decrease from 98 knots to 68 knots, a reduction of about 31%. This initial result appeared to support the hypothesis that cloud seeding could disrupt a hurricane's circulation.
Two days later, on August 20, a second seeding attempt was made. However, monitoring aircraft found Hurricane Debbie had intensified to 99 knots and developed a double eyewall structure. While a further wind reduction to 84 knots was recorded after the second operation, researchers later cautioned that these changes might have been due to natural storm processes, such as eyewall replacement cycles, rather than the silver iodide.
Project STORMFURY continued for years, but further comparable experiments were rare. Later scientific understanding indicated that hurricanes generally lack sufficient supercooled water for silver iodide seeding to be effective. The Hurricane Debbie experiment remains notable for its initial apparent success, which was ultimately complicated by the storm's natural variability, making it impossible to definitively attribute the wind reduction to human intervention.
