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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 ...
Despite unfavorable upper-level winds, the storm intensified into a hurricane about 24 hours later. Allison then peaked with maximum sustained winds of 75 mph (121 km/h) and a minimum barometric pressure of 987 mbar (29.1 inHg). Increasing wind shear weakened it to a tropical storm early on June 5.
Although it was strengthening, QuikSCAT suggested that the low-level circulation was falling apart, as it appeared to be merging with the cold front. [85] At 0000 UTC on October 21, Nadine attained its peak intensity with winds of 60 mph (95 km/h) and a minimum barometric pressure of 999 mbar (29.5 inHg). [83]
Morakot reached peak intensity later that day with winds of 85 km/h (53 mph) and a minimum barometric pressure of 992 mbar (hPa; 28.29 inHg). [12] This intensity was held for several hours until less conducive atmospheric conditions slightly weakened the system; this was followed by Morakot making landfall on southern Taiwan on August 3.
After evidence of an eye feature appeared, Earl was upgraded to a hurricane on September 8. Six hours later, the storm attained its peak intensity with winds of 75 mph (120 km/h) and a minimum pressure of 985 mbar (29.1 inHg). Under the influence of an upper cold low, Earl began re-curving and accelerated to the northeast.
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.
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.
Winds reached 60 mph (97 km/h) in Savannah, which registered a pressure of 1,001 mbar (29.55 inHg). [12] In South Carolina , Charleston reportedly experienced its heaviest rain storm since 1854, with 8.53 in (217 mm) of precipitation falling in a 36-hour period, more than 2 in (51 mm) above the total amount of rainfall observed between May 1 ...