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Above the TA, the aircraft altimeter pressure setting is changed to the standard pressure setting of 1013 hectopascals (equivalent to millibars) or 29.92 inches of mercury, with the aircraft altitude will be stated as a flight level instead of altitude. In the United States and Canada, the transition altitude is 18,000 ft (5,500 m). [5]
The nor'easter became a bomb cyclone [8] on October 26–27, when its central barometric pressure dropped from 996 mbar (29.41 inHg) to 973 mbar (28.73 inHg) over a 24 hour period. During this time, at 00:00 UTC on October 27, the system also reached its peak strength with sustained winds of 70 mph (110 km/h), while located about 125 mi ...
However, the depression peaked in strength later that day with winds of 55 km/h (35 mph) and a minimum pressure of 1000 mbar (hPa; 29.53 inHg). [7] This intensity was sustained for several hours before the storm began to slowly weaken early on October 27. [ 8 ]
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]
With an upper-level low to the northwest, Ulika slowly turned north, then northeast, back into the Eastern Pacific by 18:00 UTC the following day, Situated in a favorable environment, Ulika steadily intensified, reaching Category 1 strength at 2:00 a.m. PDT (09:00 UTC) on September 28, and simultaneously reaching a peak intensity of 75 mph (120 ...
The 1991 Pacific typhoon season was a slightly above-average season with 29 tropical storms, 17 typhoons and five super typhoons forming. It was quite a catastrophic season – Typhoon Yunya impacted the Philippines in mid June while in the same time experiencing a volcanic eruption, Typhoon Mireille severely impacting Japan, which became known for being the costliest typhoon on record until ...
As in Alabama, negative surge values were recorded at the storm's onset. The tide gauge at Gulfport recorded a water level of 5.6 ft (1.7 m) below average early on September 2, before quickly swelling to 5.43 ft (1.66 m) above normal. [94] Air pressure reportedly fell so rapidly at Pascagoula that car windows began to shatter. [84]
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.