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With a barometric pressure of 922 hPa (27.23 inHg) at the time of landfall in Florida, Andrew is the sixth most-intense hurricane to strike the United States. Several hours later, the hurricane emerged over the Gulf of Mexico at Category 4 strength, with the Gulf Coast of the United States in its dangerous path.
Atmospheric pressure, also known as air pressure or barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa ), which is equivalent to 1,013.25 millibars , [ 1 ] 760 mm Hg , 29.9212 inches Hg , or 14.696 psi . [ 2 ]
The low pressure measured from an extratropical cyclone was 28.84 inches/976.7 hPa during the Storm of the Century (1993). [3] From a tropical cyclone, the lowest pressure measured was 26.35 inches/892 hPa in the Florida Keys during the Labor Day Hurricane of 1935. [4]
On October 7 in Fernandina Beach, Florida, there was a peak surge of 9.88 ft (3.01 m) above normal. Additionally, in the St. Augustine area, water was reported to be 2.5 ft (0.76 m) above ground. [125] As Matthew tracked parallel to the Florida coast, it left over one million people without power across the state of Florida. [126]
Inch of mercury (inHg and ″Hg) is a non-SI unit of measurement for pressure. It is used for barometric pressure in weather reports, refrigeration and aviation in the United States. It is the pressure exerted by a column of mercury 1 inch (25.4 mm) in height at the standard acceleration of gravity.
The larger the change in pressure, especially if more than 3.5 hPa (2.6 mmHg), the larger the change in weather can be expected. If the pressure drop is rapid, a low pressure system is approaching, and there is a greater chance of rain. Rapid pressure rises are associated with improving weather conditions, such as clearing skies. [67]
In aviation, a flight level (FL) is an aircraft's altitude as determined by a pressure altimeter using the International Standard Atmosphere. It is expressed in hundreds of feet or metres. The altimeter setting used is the ISA sea level pressure of 1013 hPa or 29.92 inHg. The actual surface pressure will vary from this at different locations ...
Highest air pressure ever recorded [above 750 meters (2,461 feet)]: 1084.8 hPa (32.03 inHg); Tosontsengel, Zavkhan, Mongolia, 19 December 2001. [332] This is the equivalent sea-level pressure ; Tosontsengel is located at 1,300 metres (4,300 ft) above sea level.