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SPS/STD - 'Standard Pressure Setting' or just 'Standard' refers to the altimeter being set to the standard pressure of 1013.25 hPa. It is the setting that causes an altimeter to read the aircraft's flight level (FL). Flight levels are given in hundreds of feet (for example: FL100 = 10 000 ft). Atmospheric pressure changes over time and position.
Reference pressure of about 29.92 inHg (1013 hPa) is showing in the Kollsman window. An altimeter or an altitude meter is an instrument used to measure the altitude of an object above a fixed level. [1] The measurement of altitude is called altimetry, which is related to the term bathymetry, the measurement of depth under water.
1 Quad 10 15 BTU, one quadrillion BTU (short-scale) or 1.055×10 18 joule (1.055 exajoules or EJ) Power 1 horsepower ≈ 745.7 W; 1 ton of refrigeration (12,000 Btu/h) = 3.517 kW; Pressure 1 inch of mercury = the pressure produced by 1 inch height of mercury = 3,386.39 pascals (33.8639 hPa, millibars) 1 pound per square inch (psi) ≈ 6,895 Pa ...
The strongest hurricane to make landfall in Canada was Hurricane Ginny of 1963, [2] which had winds of 105 mph (169 km/h) and a minimum pressure of 948 millibars (28.0 inHg), making it a Category 2 hurricane at the time of its landfall near Yarmouth, Nova Scotia. [1]
Lowest pressure: 986 mbar ... (80 to 105 km/h) and 3 to 6 inches ... when a power line fell on his horse a few feet away from him, ...
A storm surge of 3 feet (0.91 m) was reported on Nantucket while a 2.8 feet (0.85 m) storm surge was recorded in Boston. [22] Over a foot of snow was reported in portions of New Hampshire, [ 22 ] with Deefield receiving almost 29 inches (74 cm) and Middleton reported 28 inches (71 cm).
Ash and pumice piled 6 miles (9.7 km) northeast of the volcano to a thickness of 3 feet (0.9 m); 50 miles (80 km) away, the ash was 2 inches (5 cm) deep. Large pyroclastic flows and mudflows subsequently rushed down St. Helens' west flanks and into the Kalama River drainage system.
Later, the storm continued intensifying, and at 03:00 UTC on May 17 Tauktae reached its peak intensity as an extremely severe cyclonic storm, with maximum 3-minute sustained winds of 185 km/h (115 mph), [29] maximum 1-minute sustained winds of 220 km/h (135 mph), and a minimum central pressure of 950 millibars (28 inHg), [29] making the storm ...