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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 ]
A multiple-vortex tornado outside of Dallas, Texas on April 2, 1957. Since Dallas lies at the lower end of the "Tornado Alley", tornadoes have on occasion been a threat to the city. Most tornadoes hit the city during the months of April and May. [15] Dallas was hit by a powerful tornado on April 2, 1957; the tornado was later rated F3. [16]
The most intense storm in terms of both barometric pressure and maximum sustained winds was Hurricane Carla in 1961, which also caused the most fatalities, with 46 deaths. [nb 1] The first storm to impact the state during the period was Tropical Storm How in October 1950, with the latest being Tropical Depression Twenty in September 1979. [1]
The stations measure wind speed, direction, and gust; barometric pressure; and air temperature. In addition, all buoy and some C-MAN stations measure sea surface temperature, and wave height and period. [44] Conductivity and water current are measured at selected stations. All stations report on an hourly basis.
An isolated severe storm threat spreads across central Texas to central Arkansas, western Mississippi and southern Louisiana, including cities like Dallas, Fort Worth, Little Rock and Baton Rouge.
To allow modeling conditions below mean sea level, the troposphere is actually extended to −2,000 feet (−610 m), where the temperature is 66.1 °F (18.9 °C), pressure is 15.79 pounds per square inch (108,900 Pa), and density is 0.08106 pounds per cubic foot (1.2985 kg/m 3).
On the top right corner of the model for a surface weather map is the pressure, showing the last two integer digits of the pressure in millibars, or hectopascals, along with the first decimal. For instance, if the pressure at a certain location is 999.7 hPa, the pressure portion of the station model will read 997.
An associated low-pressure area and atmospheric instability resulted in the formation of tornadoes across northern Texas and Oklahoma on May 15. Afterwards the storm system weakened as it tracked eastward, though six additional tornadoes were reported in Texas, Louisiana, and Alabama in the two days following May 15. [1]