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Hurricanes in Hawaii Hurricanes Impacting Hawaii

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Hurricanes in Hawaii Hurricanes Impacting Hawaii Hurricanes in Hawaii • Hurricane climatology - when and where • Hurricane impact 1 Hurricanes Impacting Hawaii 2 Hawaii Hurricane History • No “Hawaiian Term” actually no surprise terms such as Hurricane and Typhoon arise from local terms for the winds observed. • David Malo (1843) defined five different Kona Winds. 3 Human Impacts • Economy - To-date cost of Iniki • $2.8 Billion • FY2005 Estimated General Fund Tax Revenues • $3.6 Billion 4 More Iniki Impacts ! 90% of structures on Kauai affected ! 14,118 damaged or destroyed ! 30% telephone poles down ! 3 years later unemployment 12% ! Social fabric altered-10% move away ! REMEMBER: This coincided with the bursting of the Japan Bubble Economy of the late 1980’s. 5 Typical Questions/Comments 1. It never happened before 2. Only Kauai gets hit 3. It can’t happen again 4. Mountains protect us 5. There is no Hawaiian word for hurricane 6 Hawaii Hurricane Climatology Hurricane tracks in the centr al Pacific from 1949-1998 7 Hawaii Hurricane Impacts Tropical Cyclone tracks within 200 miles of the Hawaiian Islands since 1949. 8 Hawaii Hurricane Climatology Number of hurricanes per month in the central Pacific. 9 Hurricane Impact • Energy of winds = wind velocity squared: E = V2 • A doubling of the wind speed from (e.g., from 70 to 140 mph) results in four times the destructive energy. 10 Saffir/Simpson Hurricane Scale Category 1 74 - 95 mph Storm surge 4 - 5 ft Category 2 96 - 110 mph Storm surge 6 - 8 ft Category 3 111 - 130 mph Storm surge 9 - 12 ft Category 4 131 - 155 mph Storm surge 13 - 18 ft Category 5 > 155 mph Storm surge > 18 ft Energy of winds = wind velocity squared: E = V2 A doubling of the wind speed from (e.g., from 70 to 140 mph) results in four times the destructive energy. 11 Triple Threat High winds Flash Floods flying debris Storm Surge Large Surf 12 Anamometer Trace Wind Speed in hurricane Celia as it passed Gregory, TX. 13 Hurricane Hazards The storm surge and storm waves are greatest just to the right of the storm track. Why? 14 Hurricane Gilbert In what direction is Gilbert moving? Answer: In direction of strongest wind: Westward 15 Hurricane Hazards in Hawaii The storm surge and storm waves are greatest just to the right of the storm track. Wind hazard is greatest on exposed ridges and mountain slopes. Flash flood hazard is greatest near steam beds. 16 TRIPLE THREAT FROM TROPICAL CYCLONES TRIPLE THREAT Injuries and Loss of Life Structural Damage Destruction of vegetation/crops Storm Surge Flooding of coastal areas (winds & low pressure) Erosion of Beaches Saline Intrusion–loss of fertility High Winds Loss of Power/Communications Fires - Urban and Brush Contamination of Water Supply Heavy Rains Land Subsidence Flooding of Inland Areas Mud and Landslides 17 Past Hurricane Impact The record is dominated by a few extreme events: Galveston hurricane of 1900, Iniki and Andrew in 1992. 18 Storm Surge - Elevated Sea-Level Flooding of coastal areas Erosion of Beaches Saline Intrusion–loss of fertility 19 Storm Surge Storm surges are historically responsible for the greatest numbers of deaths and they cause some of the worst damage. 20 Storm Surge Debris line from Iniki storm surge 21 Storm Surge 6000 people died in the storm surge 22 Storm Surge Storm surge, before and after hurricane Camille. 23 Ivan Aftermath • 52 deaths in US • 70 deaths in Caribbean Storm Surge 24 Ivan Aftermath Storm Surge Storm Surge Storm Surge Storm Surge 25 Hurricane Wind Damage High Winds 26 Iniki Wind Damage 27 Hurricane Wind Damage Wind damage to Darwin, Australia from hurricane Tracy. Similar wind damage occurred in Andrew. 28 Hurricane Rains and Flooding 29 Ivan Aftermath Heavy rains & Flooding in NC 30 North Carolina Flooding Slo w moving tropical cyclones result in very large rainfalls. 31 Hurricane Forecasting Hurricane Andrew Hurricane forecasting involves predicting the future track and intensity of a hurricane. 32 Hurricane Advisories • Hurricane Watch - Hurricane may threaten the coast. Issued ~ 36 hours in advance • Hurricane Warning - Hurricane conditions are expected within 24 hours. Issued ~12-24 hours in advance. 33 Hurricane Forecasting Hurricane forecasting involves predicting the track and intensity of a hurricane. Hurricane tracks are erratic and difficult to predict. A combination of observations, numerical model output, and climate data are used to forecast hurricane tracks. 34 Hurricane Forecasting More progress has been made in hurricane track forecasting than in forecasting hurricane intensity change. 35 Cloud Drift Winds IR Imagery from Bonnie 8/25/98 1145 UTC (Blue Rings at 100 and 350 km Radius) 36 Satellite Rainfall Measurement 37 Hurricane Forecasting Radar Observed Rainfall 48-h model forecast with satellite observations 48-h model forecast without satellite observations 38 Hurricane Jimena 39 Locating Hurricane Jimena 40 Layer-Mean Winds Steer the Storm 41 Track Forecast 42 Sea Surface Temperature Important Factor for Hurricane Strength 43 Wind Shear Weakens Storm 44 Thunderstorms and Flooding 45 Thunderstorms and Flooding Rains turned out to be moderate and mostly beneficial to drought stricken Big Island. The heaviest rainfall was in Upper Puna, where 8.43 inches were recorded in Glenwood and 6.09 inches in Mountain View in the 24 hours ending at 2 p.m. yesterday. Pi'ihonua recorded 5.75 inches, while Waiakea Uka had 5.79 inches. 46 Winds in Hurricane Jimena Officials with Hawai'i Electric Light Co. scrambled to repair downed power lines and remove tree branches tangled in lines, especially in Puna and Waimea. 47 Questions? 48.
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