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 697 
 WTPA45 PHFO 131459
 TCDCP5
  
 Tropical Depression Olivia Discussion Number  52
 NWS Central Pacific Hurricane Center Honolulu HI   EP172018
 500 AM HST Thu Sep 13 2018
  
 Olivia continues to move rapidly toward the west-southwest away 
 from the main Hawaiian Islands this morning. Southwesterly vertical
 wind shear of over 30 kt remains in the vicinity of Olivia.
 Scattered thunderstorms continue to develop far northeast,
 southeast, and south of the low-level circulation center (LLCC), but
 the core of the system remains completely devoid of deep convection.
 An ASCAT pass over Olivia's outer circulation at 0810Z showed a
 swath of 30 kt winds. The latest subjective Dvorak current
 intensity estimate was 1.5/25 kt from PHFO and JTWC. The UW-CIMSS
 ADT was also 1.5/25 kt. We will keep the initial intensity 30 kt for
 this advisory based on the earlier scatterometer data. Olivia is
 expected to remain a tropical depression into tonight. However, we
 continue to indicate it will become a post-tropical remnant low
 starting late tonight or on Friday. This intensity forecast is close
 to the IVCN guidance.
  
 The initial motion for this advisory is 255/16 kt. The LLCC is being
 steered by the low-level trade wind flow. A general west-southwest
 motion with a slight decrease in forward speed is forecast through
 this morning. Olivia will likely turn toward the west later today,
 and then the west-northwest tonight and Friday as the system
 increasingly interacts with the upper-level low responsible for the
 wind shear. The latest track forecast has been adjusted to the left
 during the first 24 hours, which takes into account the faster
 initial motion. This track forecast remains close to the previous
 forecast for the 36 through 72 hour time period. This forecast track
 closely follows the TVCE and HCCA, and remains near the middle of
 the guidance envelope.
 
 Lingering moisture from Olivia continues to cause heavy rainfall
 across portions of the main Hawaiian Islands this morning. These
 wet conditions will likely persist through tonight. Since many
 areas are already saturated, any additional heavy rainfall could
 produce life-threatening flash flooding.
  
  
 FORECAST POSITIONS AND MAX WINDS
  
 INIT  13/1500Z 19.5N 162.2W   30 KT  35 MPH
  12H  14/0000Z 19.1N 164.2W   30 KT  35 MPH
  24H  14/1200Z 19.4N 167.0W   30 KT  35 MPH
  36H  15/0000Z 20.0N 169.4W   30 KT  35 MPH...POST-TROP/REMNT LOW
  48H  15/1200Z 21.0N 171.7W   30 KT  35 MPH...POST-TROP/REMNT LOW
  72H  16/1200Z 23.0N 176.5W   25 KT  30 MPH...POST-TROP/REMNT LOW
  96H  17/1200Z...DISSIPATED
  
 $$
 Forecaster Houston
  
 
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