Hurricane Lisa (1998)
| Category 1 hurricane (SSHS) | |
|---|---|
 |
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| Hurricane Lisa in the northern Atlantic Ocean | |
| Formed | October 5, 1998 |
| Dissipated | October 9, 1998 |
| Highest winds | 1-minute sustained: 75 mph (120 km/h) |
| Lowest pressure | 995 mbar (hPa); 29.38 inHg |
| Fatalities | None reported |
| Damage | None |
| Areas affected | No land areas |
| Part of the 1998 Atlantic hurricane season | |
Hurricane Lisa was the 12th known tropical cyclone of the 1998 Atlantic hurricane season. The storm developed from a tropical wave that entered the Atlantic Ocean on September 29 from the coast of Africa. By October 4, a low-level circulation developed, and the system was declared a tropical depression early on October 5; it was upgraded to a tropical storm that same day. Initially moving towards the northwest, Lisa turned to the northeast, and subsequently accelerated towards the north, attaining hurricane status before transitioning into an extratropical cyclone over the cold waters of the north Atlantic. As Lisa remained far from land, no damage was reported.
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[edit] Meteorological history
On September 29, 1998, a tropical wave emerged from the east coast of Africa and entered the Atlantic Ocean, with fairly well-organized associated cloud activity. However, by the next day the wave became intermingled within the Intertropical Convergence Zone that was active throughout the tropical Atlantic. By October 3, the system became more distinguishable and better defined, as convective activity began to increase. Signs of a low-level circulation arose on October 4, while the system was located roughly midway between Africa and the Lesser Antilles. It is estimated that the system became a tropical depression at 0000 UTC on October 5.[1] The same wave eventually crossed into the eastern Pacific Ocean and spawned Hurricane Lester.[2]
Initially, the depression was disorganized as a result of strong wind shear that was generated by an upper-level low pressure system to the northwest of the storm. The western half of the depression's circulation was exposed, though the eastern semicircle maintained deep convection. On October 5, the storm was upgraded to Tropical Storm Lisa;[1] operational reports suggest that it had been a tropical storm for the past 18 hours.[3] The same low that produced the wind shear also caused a weakness in the ridge to the north, causing the storm to begin a turn towards the north.[1] At the time, further intensification was deemed unlikely due to the shear. However, Lisa consisted of a fairly large circulation that was more resilient to the shear than tropical cyclones with smaller circulations.[4] During the morning of October 7, the center of circulation was intermittently located beneath the deep convection. A nearby buoy reported winds of near 70 miles per hour (110 km/h), indicating that the storm had attained winds of about 60 mph (97 km/h).[5] A strong baroclinic trough evolved into a deep low pressure system in the central North Atlantic, which caused Lisa to turn towards the northeast.[1]
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Early on October 8, the storm became better-defined on satellite imagery.[6] Later that day, thunderstorm activity persisted near the center, and banding features developed, indications of intensification. The strengthening was attributed to weaker wind shear, or interaction with the trough.[7] In addition, an eye was "trying to form".[8] Lisa accelerated towards the northeast, with forward speed reaching over 58 miles per hour (93 km/h) during the afternoon of October 9.[1] That same day, the storm turned towards the north in response to the deep low to the west, and a strong high pressure system to the east. At 1200 UTC, the cyclone attained Category 1 hurricane status on the Saffir-Simpson Hurricane Scale.[1] Shortly thereafter, while over the cold waters of the north Atlantic, Lisa began to lose tropical characteristics, transitioning into an extratropical cyclone.[9] It merged with an extratropical frontal system, and by October 10 a well-defined circulation was no longer identifiable.[1]
[edit] Impact and naming
Since Lisa remained away from land, no effects, property damage or fatalities were reported; no ships were affected, and no tropical cyclone warnings and watches were issued.[1]
[edit] See also
[edit] References
- ^ a b c d e f g h Miles B. Lawrence (1998). "Hurricane Lisa Tropical Cyclone Report". National Hurricane Center. http://www.nhc.noaa.gov/1998lisa.html. Retrieved 2008-11-07.
- ^ Miles B. Lawrence (1998). "Hurricane Lester Preliminary Report". National Hurricane Center. http://www.nhc.noaa.gov/1998lester.html. Retrieved 2007-02-11.
- ^ Lawrence (1998). "Tropical Storm Lisa Discussion Number 1". National Hurricane Center. http://www.nhc.noaa.gov/archive/dis/NAL1298.001. Retrieved 2008-11-07.
- ^ Pasch (1998). "Tropical Storm Lisa Discussion Number 2". National Hurricane Center. http://www.nhc.noaa.gov/archive/dis/NAL1298.002. Retrieved 2008-11-07.
- ^ Avila (1998). "Tropical Storm Lisa Discussion Number 8". National Hurricane Center. http://www.nhc.noaa.gov/archive/dis/NAL1298.008. Retrieved 2008-11-07.
- ^ Mayfield (1998). "Tropical Storm Lisa Discussion Number 11". National Hurricane Center. http://www.nhc.noaa.gov/archive/dis/NAL1298.011. Retrieved 2008-11-08.
- ^ Avila (1998). "Tropical Storm Lisa Discussion Number 12". National Hurricane Center. http://www.nhc.noaa.gov/archive/dis/NAL1298.012. Retrieved 2008-11-08.
- ^ Avila (1998). "Tropical Storm Lisa Discussion Number 13". National Hurricane Center. http://www.nhc.noaa.gov/archive/dis/NAL1298.013. Retrieved 2008-11-08.
- ^ Avila (1998). "Hurricane Lisa Discussion Number 17". National Hurricane Center. http://www.nhc.noaa.gov/archive/dis/NAL1298.017. Retrieved 2008-11-08.
[edit] External links
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