Tropical Storm Lane update: 3 p.m. Aug. 25

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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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View Hawaii flood maps at this link.

As Tropical Storm Lane weakens and moves west away from the islands, it brings with is moisture that will produce heavy rainfall over the state. The National Weather Service says some areas may experience rainfall amounts greater than 20 inches.

Because of this, the NWS issued a Flash Flood Watch for the entire state until late tonight.

Rain events of this size cause widespread flooding and can affect areas that do not usually flood. Low spots in roads will become dangerous and impassible due to severe runoff.

Debris in streams and gulches may clog bridges and culverts resulting in dangerous flooding.

Areas that are already experiencing the elevated rainfall are Hawaii and Maui.

A Flash Flood Warning is in effect for the island of Hawaii until 5:00 p.m.

At 1:45 p.m., radar and rain gages showed areas of heavy rain continuing to move across the east side of the Big Island from the southeast. Rain rates were about 1 inch per hour.

Any additional heavy rain on the fully saturated ground will cause rapid increases of water levels in streams and drainages.

The public is being asked to avoid all unnecessary road travel.

This warning is for the northeast and southeast sides of the Big Island from Hawi to Hilo to South Point.

For Maui, a flood advisory is in effect until 5:45 p.m.

At 2:47 p.m., radar indicated moderate to heavy rain along the windward slopes of Maui. The highest rain rates were estimated to be up to an inch per hour over the Hana area and over Puu Kukui.

Rainfall is expected to continue through the afternoon.

Locations in the advisory include but are not limited to Kahului, Kapalua, Honokohau, Kahakuloa, Puunene, Haliimaile, Pauwela, Waikapu, Paia, Makawao, Wailuku, and Keokea.

As for Lane, at 11:00 a.m., the tropical storm warnings and watches were discontinued for all islands.

The center of weakening Tropical Storm Lane was about 145 miles southwest of Oahu and 160 south of Kauai. Lane is moving west at near 7 mph 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 have dropped to about 50 mph with higher gusts. Some weakening is forecast during the next 48 hours. Tropical-storm-force winds extend outward up to 100 miles from the center.

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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