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Tropical Storm Lorenzo (2001)

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Tropical Storm Lorenzo
Tropical storm (SSHWS/NWS)
Lorenzo on October 30, 2001.
FormedOctober 27, 2001
DissipatedOctober 31, 2001
Highest winds1-minute sustained: 40 mph (65 km/h)
Lowest pressure1007 mbar (hPa); 29.74 inHg
FatalitiesNo fatalities reported
DamageNone
Areas affectedNo land areas affected
Part of the 2001 Atlantic hurricane season

Tropical Storm Lorenzo was, in terms if wind, the weakest named tropical cyclone of the 2001 Atlantic hurricane season and last of four named storms to form in October. The 12th tropical cyclone of the season, Lorenzo originated in an upper-level trough that persisted over the eastern North Atlantic Ocean on October 26, the second storm of the season to form from a baroclinic system.[1] Throughout its existence, Lorenzo stayed out to sea, never threatening any land areas. Upon forming, it was predicted to be a moderate tropical storm with winds of 60 mph (95 km/h), though it only reached a peak of 40 mph (60 km/h) on October 30. The storm's remnants were absorbed by a frontal system on October 31.

Storm History

Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
Map key
Saffir–Simpson scale
  Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown
Storm type
triangle Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

In October 2001, an upper-level tropospheric trough persisted in the eastern Atlantic Ocean.[2] By October 26, a low-level circulation formed beneath the trough, and quickly gained organization. On October 27, the low formed into Tropical Depression Fourteen about 860 miles (1380 kilometers) south-southwest of the western Azores.[3] The depression drifted westward for the next three days, entering an area of high wind shear which initially inhibited development.[4] The depression was forecast to attain winds of at least 60 mph (95 km/h), though it failed to attain that intensity.[5][6] The depression was the second storm of the season to form from a baroclinic system.[1]

Banding features developed over the storm, and on October 30 it was upgraded to Tropical Storm Lorenzo.[5] Wind shear also relented, allowing for further organization and development. At 0000 UTC on October 30, Lorenzo strengthened to reach peak winds of 40 mph (60 km/h) with a minimum barometric pressure of 1007 millibars.[5] A mid-level trough broke up the ridge to the north of the storm, and the storm continued to the north.[7] Convection began to remove itself from the circulation, failing to strengthen.[8] At around the same time, the cyclone was losing tropical characteristics, with winds just above tropical storm status.[9] Before the final advisory was issued by the National Hurricane Center, Lorenzo was predicted to accelerate and briefly attain winds of 45 mph (65 km/h). This failed to occur, and the final advisory was issued on the storm the next morning as it became extratropical. On October 31. Lorenzo's remnants merged with a frontal system about 690 miles (1110 kilometres) west of the Azores.[2][10]

Preparations, impact and naming

One ship reported winds of 42–49 mph (49–78 km/h) on October 28 and October 29, as it neared then Tropical Depression Fourteen. However the ship had a wind bias of 26 mph (41 km/h).[2] Because the storm remained from land, no effects, damages, or fatalities were reported. As a result, the name was not retired by the World Meteorological Organization in the spring of 2002. This was the first storm named Lorenzo in the Atlantic basin, replacing 1995's devastating Hurricane Luis.[11] The name was reused in the 2007 Atlantic hurricane season.

See also

Template:Tcportal

References

  1. ^ a b National Hurricane Center (2002). "2001 Monthly Weather Review" (PDF). National Hurricane Center. Retrieved 2008-01-07.
  2. ^ a b c Miles B. Lawrence (December 6, 2001). "Tropical Cyclone Report - Tropical Storm Lorenzo". National Hurricane Center. Retrieved 2008-01-07.
  3. ^ Jack Beven (October 27, 2001). "Tropical Depression 14 - Discussion Number 3". National Hurricane Center. Retrieved 2008-01-07.
  4. ^ Miles B. Lawrence (October 27, 2001). "Tropical Depression 14 - Discussion Number 3". National Hurricane Center. Retrieved 2008-01-07.
  5. ^ a b c Jack Beven (October 30, 2001). "Tropical Storm Lorenzo - Discussion Number 11". National Hurricane Center. Retrieved 2008-01-07.
  6. ^ Stacy Stewart (October 28, 2001). "Tropical Depression 14 - Discussion Number 5". National Hurricane Center. Retrieved 2008-01-08.
  7. ^ Richard J. Pasch (October 30, 2001). "Tropical Storm Lorenzo - Discussion Number 12". National Hurricane Center. Retrieved 2008-01-08.
  8. ^ Jack Beven (October 30, 2001). "Tropical Storm Lorenzo - Discussion Number 13". National Hurricane Center. Retrieved 2008-01-08.
  9. ^ Jack Beven (October 30, 2001). "Tropical Storm Lorenzo - Discussion Number 14". National Hurricane Center. Retrieved 2008-01-07.
  10. ^ Richard J. Pasch (October 31, 2001). "Tropical Storm Lorenzo - Discussion Number 16". National Hurricane Center. Retrieved 2008-01-08.
  11. ^ FEMA (2007). "Are You Ready?". Federal Emergency Management Agency. Retrieved 2008-01-07.
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