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.

Episoder(210)

Gust vs Sustained Wind: Application to Building Standards

Gust vs Sustained Wind: Application to Building Standards

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29 Nov 202410min

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

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25 Nov 202416min

What a Second Trump Term Means for Science

What a Second Trump Term Means for Science

People express concern over the potential impact of a second Trump presidency on US science policy. They highlight anxieties regarding potential budget cuts to scientific research, increased focus on research security potentially hindering international collaboration, and a diminished respect for scientific consensus in policy decisions, particularly concerning climate change and public health. The appointment of Robert F. Kennedy Jr. to a key position is cited as a cause for alarm due to his controversial views on public health. Finally, there are discussions of proactive strategies for the scientific community to engage with the new administration and advocate for continued funding and the preservation of independent scientific agencies.

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

A potential tropical storm, dubbed Invest 99L, is forming in the Caribbean and has a high chance of developing into Tropical Storm Sara within the next few days.Multiple weather models are forecasting Sara to potentially become a hurricane and threaten Florida's Gulf Coast next week, although the track and intensity of the storm remain uncertain. MeteorologyMatters discusses the rarity of November hurricanes, with only three recorded landfalls in the US since 1850, but warn that warm water temperatures in the Atlantic basin are fueling an unusually active hurricane season.

13 Nov 202417min

Abortion and LGBTQ Community Cause Hurricanes?

Abortion and LGBTQ Community Cause Hurricanes?

Meteorology Matters addresses Tucker Carlson’s bizarre assertion that abortions cause hurricanes, dismissing scientific explanations for their increased frequency and intensity, and instead linking them to a supposed “human sacrifice.” We examine these claims through a scientific lens, presenting evidence that contradicts their religious justifications and highlights their potential harm in influencing public opinion on scientific and social issues. We look back at televangelist Pat Robertson’s claims over the years that he can control the weather and that God is punishing the U.S. for its increasing acceptance of homosexuality, specifically targeting Disney World and abortion supporters.

12 Nov 202420min

Biden Protecting Climate Protections from Donald Trump

Biden Protecting Climate Protections from Donald Trump

Meteorology Matters looks at the potential impact of Donald Trump’s return to the presidency on science and environmental policy. Currently, the Biden administration is trying to solidify its environmental policies, such as those regarding greenhouse gas emissions and vehicle electrification, before Trump takes office. We examine the uncertainty surrounding Trump’s potential return to power and how it might influence scientific research, particularly concerning climate change, vaccine skepticism, and the role of government funding in science. There’s the potential for conflict between Trump’s agenda and the goals of the scientific community.

11 Nov 20248min

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