Conversion between wind speed and wind pressure

Formula: WP = 0.5 ro v? . Where wp is wind pressure [kN/m? ], ro is the air density [kg/m? ], v is the wind speed [m/s].

Deduction process:

Where wp is wind pressure [kN/m? ], ro is the air density [kg/m? ], v is the wind speed [m/s].

Since the relationship between air density (ro) and gravity (R) is R = RO G, there is ro=r/g, and the formula can be used: WP = 0.5 R V? /gram.

This formula is the standard wind pressure formula. In the standard state (air pressure 10 13 hPa, temperature15 C), the severity r=0.0 1225[kN/m? ], the gravity acceleration at latitude 45 is g=9.8[m/s? ], we get: WP = 0.5 ro v? .

Extended data:

Wind speed:

Wind has both magnitude and direction, so the wind forecast includes wind speed and direction. The magnitude of wind speed is usually expressed by wind grade. The level of wind is determined according to the degree of influence of wind on ground objects. Meteorology is generally divided into seventeen grades according to the magnitude of wind.

In the weather forecast, we often hear the expression "the north wind is 4 to 5", in which the wind refers to the average wind; If you hear the phrase "gust 7", gust refers to the wind with high and low speed, and the wind at this time refers to the high-speed wind.

In fact, in nature, the wind sometimes exceeds 12. For example, the central wind force of a strong typhoon or tornado may be much larger than the magnitude of 12, but the wind above the magnitude of 12 is rare, so the magnitude is generally not specified.

record

Hurricane John is the third recorded category 5 hurricane in the Central Pacific Ocean, which set a record for the highest wind speed in this area, reaching 280 km/h. Since 1994, only Hurricane Ou Kai has reached the category 5 hurricane intensity in the Central Pacific Ocean. Like girma, its air pressure is lower than John's, but its wind speed is slower than John's.

When Typhoon Dai Wen transited, its intensity was equivalent to the second-class typhoon in the tropical cyclone classification of the National Hurricane Center. At that time, the average wind force in Victoria Harbour was 1.33 km/h, the highest gust was 259 km/h, and Tate's Cairn also recorded a gust of 284 km/h.

Typhoon Taipei is the strongest tropical cyclone typhoon ever recorded on earth. At present, the tropical cyclone with the highest wind speed is Typhoon Haiyan in the northwest Pacific Ocean, with an average wind speed of 3 15 km/h.

The fastest "normal" wind speed on the earth's surface reached 372km/h, which was recorded on April 1934 in Mount Washington, New Hampshire, USA. However, during the tornado in Oklahoma in May 1999, the fastest wind speed measured by researchers reached 513 km/h. ..

Baidu encyclopedia-wind pressure

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