Tropical Storm Lane update: 5 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 accelerates west away from the islands, it brings with it 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 8:00 p.m.

At 4:42 p.m., radar showed intense rain from a thunderstorm over the lower Puna District. The most intense rainfall of 2 to 3 inches per hour was over the area from Hawaiian Paradise Park to Leilani Estates. Additional rainfall is expected to move over the east-facing slopes of the Big Island through early this evening.

Locations in the warning include but are not limited to Hilo, Hawaiian Acres, Orchidland Estates, Glenwood, Pepeekeo, Keaau, Volcano, Laupahoehoe, Wood Valley, Hawaiian Paradise Park and Pahoa.

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.

At 5:00 p.m., the center of Tropical Storm Lane was 195 miles southwest of Honolulu and has sped up to 9 mph as it moves west away from the island. This motion is expected to continue through Monday with a slight increase in forward speed.

Maximum sustained winds are near 50 mph with higher gusts. Some weakening is forecast during the next 48 hours. 

Tropical-storm-force winds extend outward up to 90 miles from the center.

SUMMARY INFORMATION

LOCATION:

  • 19.5N 160.2W
  • ABOUT 195 MI…310 KM SW OF HONOLULU HAWAII
  • ABOUT 180 MI…290 KM SSW OF LIHUE HAWAII

MAXIMUM SUSTAINED WINDS…50 MPH…85 KM/H

PRESENT MOVEMENT…W OR 270 DEGREES AT 9 MPH…15 KM/H

MINIMUM CENTRAL PRESSURE…998 MB…29.47 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 over the main Hawaiian Islands through Sunday, which could lead to additional flash flooding and landslides.


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The low level circulation center of Lane is exposed in visible satellite imagery with bursts of deep convection continuing to pulse east of the low level center. Based on the latest Dvorak fixes and the latest satellite representation of Lane, we have maintained the initial intensity at 45 knots with this advisory. Wind radii were decreased slightly based on a recent ASCAT pass which captured the eastern side of the circulation.

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 by 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 270/8 knots. A slight increase in forward is expected over the next couple of days as the low level center remains embedded in the trades south of an area of high pressure north of Hawaii. By day 3, a turn to the  northwest is expected the the system rounds the southwest side of the high. The current track forecast has been nudged 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. 

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