Understanding the National Hurricane Center's Forecast Cone
• The National Hurricane Center (NHC) provides a detailed forecast cone graphic to represent the potential path and impact of tropical cyclones. This cone illustrates the uncertainty in the storm's track over a five-day period, with solid white areas covering days 1-3 and stippled white areas for days 4-
• The cone is constructed using historical forecast error data, ensuring that the storm's center remains within the cone approximately 60-70% of the time. Additionally, the graphic highlights areas under hurricane warnings (red), hurricane watches (pink), tropical storm warnings (blue), and tropical storm watches (yellow). Wind speeds are categorized as tropical depression (<39 mph), tropical storm (39-73 mph), hurricane (74-110 mph), and major hurricane (>110 mph). The effects of these storms can extend hundreds of miles beyond the cone's boundaries, emphasizing the importance of understanding the graphic's limitations.
Impact & Risks
The NHC's forecast cone is a critical tool for understanding the potential impacts of tropical cyclones. However, it is important to note that the cone only represents the probable path of the storm's center and does not account for the full extent of hazardous conditions. Hurricane-force winds (≥74 mph) and tropical storm-force winds (39-73 mph) can affect areas far outside the cone. This means that residents in regions near the cone should remain vigilant, as they may still experience severe weather conditions, including strong winds, heavy rainfall, and potential flooding.
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