Fog Duration (minutes or hours) | Web Scraping Tool | ScrapeStorm

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Introduction

Fog Duration (minutes or hours) refers to the continuous period from the onset of a fog event to its complete dissipation at a given location, usually expressed in minutes or hours. It may also be calculated based on the time during which visibility remains below a defined threshold. This metric is used to describe how long a fog event persists and how significantly it may affect transportation, operations, and daily activities.

Applicable Scene

It is widely used in meteorological observation, road traffic safety management, airport operation support, port and marine scheduling, agricultural environment monitoring, and disaster risk assessment. For example, by analyzing fog duration in a specific area, authorities can identify the time span of low-visibility conditions and support highway restrictions, flight scheduling, and vessel navigation management.

Pros: Fog duration is clearly defined and relatively easy to measure, providing a direct indication of how long a fog event affects a region. When combined with visibility, humidity, wind speed, and temperature data, it can also help analyze the formation, maintenance, and dissipation of fog, supporting warnings and operational decisions.

Cons: This metric mainly shows how long fog lasts, but it does not by itself describe fog density, spatial coverage, distribution, or hazard severity. Differences in fog definition standards, observation instruments, or statistical methods across regions may reduce data consistency. In addition, intermittent fog events can be difficult to define and count accurately.

Legend

1. Severe TStorm Warnings by Time of Day.

2. The distribution of the number of strokes per thunderstorm hour on a base-2 logarithmic scale in three cities whose locations are identified in Fig. 2.

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Reference Link

https://www.weather.gov/source/zhu/ZHU_Training_Page/fog_stuff/forecasting_fog/FORECASTING_FOG.htm

https://www.researchgate.net/figure/Fog-duration-Number-of-fog-events_tbl1_281859822

https://en.wikipedia.org/wiki/Fog