NHC Issues Hurricane Helene Tropical Cyclone Report

NHC Issues Hurricane Helene Tropical Cyclone Report

Timeline of Hurricane Helene (September 24-27, 2024)

  • September 20-22: A Central American Gyre (CAG) develops, bringing heavy rains to portions of Nicaragua and Honduras as it moves slowly northward.
  • September 23, 1200 UTC: The large circulation of the CAG straddles Central America and the northwestern Caribbean Sea. Deep convection begins to organize near a mid-level vorticity maximum about 130 nautical miles south of Grand Cayman. The system lacks a well-defined low-level center necessary to be a tropical cyclone.
  • September 23, 1500 UTC: The National Hurricane Center (NHC) initiates potential tropical cyclone advisories as the system is expected to become a tropical cyclone and bring tropical storm conditions to land areas within the next couple of days.
  • September 24: The system becomes Tropical Storm Helene. It enters the Gulf of America as a category 1 hurricane later in the day and turns northward.
  • September 25: Tropical storm conditions are observed over portions of the eastern Yucatan Peninsula of Mexico (including Cancun, Cozumel, and Isla Mujeres) and western Cuba. Helene develops a secondary wind maximum farther from the center.
  • September 26: Helene rapidly intensifies over the very warm Gulf waters while accelerating north-northeastward. Aircraft reconnaissance reports an eye around 0600 UTC, and a clear eye becomes visible on satellite imagery around 1800 UTC.
  • September 26, 1800 UTC: Helene intensifies into a 105-knot major hurricane, located about 150 nautical miles west-southwest of Tampa, Florida.
  • September 27, 0000 UTC: Helene reaches its peak intensity of 120 knots, located about 80 nautical miles south-southwest of the coast of the Florida Big Bend region. Its central pressure is estimated to be around 941 mb.
  • September 27, 0310 UTC: Hurricane Helene, a category 4 hurricane with winds of 120 knots and a central pressure of 939 mb, makes landfall about 10 nautical miles southwest of Perry, Florida. This is the strongest landfalling hurricane in the Florida Big Bend region since reliable records began around 1900.
  • September 27: Helene moves inland, bringing catastrophic storm surge to Florida's Gulf Coast, life-threatening wind gusts far inland across the southeastern United States, and historic rainfall leading to catastrophic flooding and landslides in the southern Appalachians. Numerous tornadoes are produced.
  • September 28, 0600 UTC: Helene's sustained winds drop below gale force.
  • September 28-29: The remnants of Helene continue to produce impacts, including tropical storm force winds and gusts across portions of the Mid-Atlantic and Ohio Valley as it becomes post-tropical and eventually dissipates.

Avsnitt(212)

Hurricane Helene: Impact Erwin Tennessee

Hurricane Helene: Impact Erwin Tennessee

Meteorology Matters looks at a Washington Post investigation into the deaths of six Impact Plastics employees during Hurricane Helene's flooding in Erwin, Tennessee. The investigation highlights the role of both the severe weather and allegedly inadequate employer responses in the fatalities, contrasting this with the successful rescue of hospital staff and patients. We also examine the deaths of workers at an Amazon warehouse and a Kentucky candle factory during a tornado. The lack of union representation contributed to the workers' inability to leave their workplaces before the disaster and emphasizes the importance of unions in ensuring worker safety and fair treatment. This boils down to the tragic consequences of prioritizing profit over worker safety in the face of extreme weather events.

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Lake Effect: 6 Feet of Snow Forecast for Watertown, NY

Lake Effect: 6 Feet of Snow Forecast for Watertown, NY

Meteorology Matters reports on a major Thanksgiving Weekend lake-effect snowstorm impacting upstate New York and parts of the Great Lakes region. Significant snowfall accumulations of up to five or six feet are predicted, especially near Watertown, NY, and along the shores of Lakes Erie and Ontario. Hazardous travel conditions and widespread disruptions are anticipated, prompting warnings and travel restrictions. State and local authorities are mobilizing resources, including the National Guard and transportation crews, to respond to the storm's impact. The storm is expected to last through early Monday.

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Gust vs Sustained Wind: Application to Building Standards

Gust vs Sustained Wind: Application to Building Standards

Meteorology Matters presents an analytical framework for standardizing tropical cyclone wind characteristics (mean wind speed, turbulence intensity, integral scale, gust factor, and peak factor) from various measurement conditions to a common reference. This framework uses equilibrium boundary-layer theory and is applied to data from seven tropical cyclones (four typhoons, three hurricanes), comparing results to existing standards (ASCE 7-10 and AIJ-RLB-2004). We continue to. examine gust factor variations based on coastal tower measurements during three landfalling typhoons. We explore the relationships between gust factor and turbulence intensity, height, wind speed, and direction, finding that gust factors are smaller than those in national codes and influenced significantly by shoreline confinement on sea wave development.

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Thanksgiving Week Weather

Thanksgiving Week Weather

Meteorology Matters discusses Thanksgiving week weather forecasts across the U.S., predicting potential travel disruptions. CBS News reports on severe storms impacting the Pacific Northwest and California, with ensuing power outages and fatalities, while also forecasting rain and snow in the East impacting Thanksgiving travel. Weather.com provides a more detailed, day-by-day forecast, highlighting potential travel issues due to snow in mountainous regions and lake-effect snow in the Great Lakes area, along with rain and thunderstorms in other parts of the country. The overall message is one of caution and preparedness for holiday travel.

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Deadlines Loom for FEMA Hurricane Disaster Assistance, Unemployment, and Appeals

Deadlines Loom for FEMA Hurricane Disaster Assistance, Unemployment, and Appeals

Meteorology Matters provides details onthe Disaster Unemployment Assistance (DUA) and Federal Emergency Management Agency (FEMA) aid available to Florida residents affected by Hurricanes Helene and Milton. We explain how to apply for FEMA assistance and appeal denials, highlighting challenges faced by applicants. We also focus on DUA application procedures, deadlines, and eligibility requirements for individuals whose employment was impacted by the hurricanes. We go over supplemental information on DUA, including eligibility criteria, application methods, and appeal processes, emphasizing the importance of meeting deadlines and providing necessary documentation. We aim to inform and guide individuals seeking aid after the hurricanes before time runs out!

25 Nov 202416min

What a Second Trump Term Means for Science

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25 Nov 202416min

Climate Change Supercharged Hurricane Season 2024

Climate Change Supercharged Hurricane Season 2024

Meteorology Matters looks at how Climate change significantly intensified the 2024 Atlantic hurricane season. Multiple reports, including one from Climate Central and a peer-reviewed study in Environmental Research: Climate, confirm that human-caused ocean warming increased the wind speeds of all eleven hurricanes. This resulted in seven hurricanes being upgraded to higher Saffir-Simpson categories and two tropical storms becoming hurricanes. The increased intensity led to substantial damage and economic losses, with climate change attributed to a significant portion of the damage caused by Hurricanes Helene and Milton. A separate analysis by a hurricane expert highlights the unusually active 2024 season, noting record-breaking ocean temperatures and the occurrence of three simultaneous hurricanes in October.

23 Nov 202418min

November Florida Hurricanes & Potential Sara

November Florida Hurricanes & Potential Sara

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13 Nov 202417min

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