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The rule affected only those aircraft operating under IFR when in level flight above 3,000 ft above mean sea level, or above the appropriate transition altitude, whichever is the higher, and when below FL195 (19,500 ft above the 1013.2 hPa datum in the UK, or with the altimeter set according to the system published by the competent authority in ...
The cyclone tracked westward through the southernmost Leeward Islands, generating southeast winds, rain, and sea-level pressures of 1,008 mb (29.78 inHg). [10] Gradually strengthening, it reached hurricane intensity on August 6, and passed 35 mi (55 km) south of Jamaica , [ 4 ] producing unsettled weather and falling barometers in Kingston . [ 10 ]
During the late hours of October 9, the JTWC stated the storm had reached gale-force winds, and commenced its advisories. On the following day, the depression intensified into a Deep depression, reaching its peak intensity with sustained wind speeds at 55 km/h (35 mph) and a minimum central pressure estimated near 1,001 mbar (29.56 inHg).
Westerly wind shear exposed the storm's low-level circulation, causing Ida to strengthen only slightly. [69] Wind shear briefly decreased, allowing the cyclone to peak with winds of 50 mph (80 km/h) and a minimum pressure of 1,001 mbar (29.6 inHg) at 12:00 UTC on September 21. However, shear increased later that day, causing slow weakening.
Frieda continued to intensify until peaking with winds of 60 mph (95 km/h) and a minimum barometric pressure of 1,005 mbar (29.7 inHg) early on October 18. Later that day, Frieda weakened and fell to tropical depression intensity. At 0000 UTC on October 19, the storm made landfall near Belize City, Belize as a weak tropical depression.
It was the fastest-developing tropical cyclone on record, with a pressure drop of 100 mbar in a 24‑hour period, reaching a minimum pressure of 876 millibars (25.9 inHg) at peak intensity. [18] A tornado struck Inza Island, destroying 26 homes and injuring 26 people, as the cyclone passed by Okinawa .
Over the next few days, the low moved towards the southeast, while the system's low-level circulation centre gradually developed further, in an area of moderate vertical wind shear. [ 11 ] [ 12 ] During the next day, the low moved out of the Australian region and moved into the South-West Indian Ocean, where it was named Alenga by the Mauritius ...
At that time, multispectral animated satellite imagery revealed a low-level circulation center with cloud lines circling along the feature. The system was also in an area conducive for further development , with poleward outflow , favorable wind shear , and 30 °C (86 °F) sea surface temperatures . [ 2 ]