Tropical Storm Lane update: Aug. 25, 2018 at 11 a.m. HST

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EDITOR’S NOTE: This is an archive post of KHON2’s ongoing Lane coverage. Click here to view the most recent update.

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At 1100 AM HST (2100 UTC), the center of Tropical Storm Lane was located near latitude 19.7 North, longitude 159.4 West. Lane is moving toward the west near 7 mph (11 km/h) and this motion is expected to continue this afternoon through Monday with an increase in forward speed. On the forecast track, Lane is expected to pass about 150 miles south of Kauai later today.

Maximum sustained winds are near 50 mph (85 km/h) with higher gusts. Some weakening is forecast during the next 48 hours. 

Tropical-storm-force winds extend outward up to 100 miles (155 km) from the center.

The estimated minimum central pressure is 997 mb (29.44 inches).

SUMMARY INFORMATION

LOCATION:

  • 19.7N 159.4W
  • ABOUT 145 MI…235 KM SW OF HONOLULU HAWAII
  • ABOUT 160 MI…255 KM S OF LIHUE HAWAII

MAXIMUM SUSTAINED WINDS…50 MPH…85 KM/H

PRESENT MOVEMENT…W OR 280 DEGREES AT 7 MPH…11 KM/H

MINIMUM CENTRAL PRESSURE…997 MB…29.44 INCHES

WATCHES AND WARNINGS

The Tropical Storm Warning has been discontinued for Oahu and Maui County.

The Tropical Storm Watch has been discontinued for Kauai County.

There are no coastal watches or warnings in effect.

Interests in the Northwestern Hawaiian Islands should monitor the progress of Tropical Storm Lane.

HAZARDS AFFECTING LAND

RAINFALL: Lingering moisture associated with Tropical Storm Lane will produce excessive rainfall this weekend, which could lead to additional flash flooding and landslides. Lane is expected to produce additional rain accumulations of 5 to 10 inches across windward Big Island and Maui and 3 to 5 inches elsewhere. Localized storm total amounts well in excess of 40 inches have already been observed along the windward side of the Big Island.

SURF: High surf is expected along exposed south and east shorelines of the main Hawaiian Islands today.


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Bursts of deep convection continue to pulse near the circulation center of Lane. Lightning has also been persistent near the core of this deep convection. Visible satellite imagery shows the low level circulation center is partially exposed on the southwest side of the deepest convection. Based on the latest Dvorak fixes and the latest satellite representation of Lane, we have lowered the initial intensity to 45 knots. Wind radii were decreased based on an overnight ASCAT pass.

Strong westerly shear of 30 to 40 kt continues to impact lane. Gradual weakening is forecast over the next couple of days due to this strong shear persisting. This follows closely with ICON and SHIPS guidance. Lane is forecast to weaken to a depression in about 36 hours and to a remnant low in about 72 hours. Assuming this low survives, it may eventually become an extratropical gale low in the vicinity of the Northwestern Hawaiian Islands around days 4 and 5.

The latest motion for this advisory is 280/6 knots. Early morning visible imagery combined with an AMSR pass at 1205Z confirmed that Lane has made the long awaited turn toward the west. The current track forecast has been shifted to the left through 48 hours, with little change from days 3 through 5. This forecast closely follows the HWRF, and lies close to the consensus models. There are only subtle changes in the track forecast compared with the previous forecast from days 2 through 5.

Based on the confirmation on the turn to the west as well as the latest forecast track, all watches and warnings for the main Hawaiian Islands have been discontinued.

KEY MESSAGES:

1.  Effects from tropical storms can and do extend well from the center. Lingering moisture associated with Lane will continue to bring persistent flooding rainfall across parts of the state.  Locally gusty winds will continue to be accelerated over higher terrain, through gaps, and where winds blow downslope.

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