Weather Blog: Brown water advisory issued for Kauai - Hawaii News Now - KGMB and KHNL

Weather Blog: Brown water advisory issued for Kauai

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HONOLULU (HawaiiNewsNow) -

 

Update 3:38 p.m. Tuesday

The flood watch has been lifted for Kauai, Niihau and Oahu.

The National Weather Service reports that, "Although there is still a slight chance for a thundershower tonight on Kauai and Niihau, a more stable airmass will continue overspreading the state. This should end the threat for flash flooding."

Update 10:45 a.m. Tuesday

A Brown Water Advisory has been issued for the east-north east areas of the island of Kauai, from Nawiliwili to (and including) Hanalei due to heavy rains.  The public is advised to stay out of flood waters and storm water runoff due to possible overflowing cesspools, sewer  manholes, pesticides, animal fecal matter, dead animals, pathogens, chemicals, and associated flood debris. If coastal waters are turbid and brown, stay out.

Update 8:00 a.m. Tuesday

The Flash Flood Warning for Kauai has expired.  However, a Flash Flood Watch remains in effect for Kauai, Niihau and Oahu.

Update 4:00 a.m. Tuesday

The National Weather Service has extended the Flash Flood Warning for Kauai until 6:30 a.m.

  • At 3:30 a.m., radar showed a very heavy shower near Kapaa, about 10 miles north of Lihue, moving northwest at 15 m.p.h. Although river gauges reported lowering stream flow across the island, the ground over much of Kauai remains saturated and additional rains could quickly produce dangerous flooding in almost any low-lying area. 
  • A flash flood watch remains in effect on Oahu through Tuesday afternoon. 

Update 1:00 a.m. Tuesday

The National Weather Service has extended the Flash Flood Warning for Kauai until 4:30 a.m.

  • At 12:55 a.m., radar showed heavy rain along the coast near Lihue Airport. An observer there reported a thunderstorm dropping about two inches of rain during the last hour. The area of heavy rain was nearly stationary. Although river gauges showed a lowering in the stream flow of the Hanalei River, the ground over much of the Garden Isle remained saturated, and any heavy rain could quickly produce dangerous flooding in almost any low-lying area or stream bed.
  • The warning is for the entire island of Kauai. Persons near the Hanalei River and other rivers and streams should remain vigilant for flash flooding.

Update 10:37 p.m.

The National Weather Service in Honolulu has issued a Flash Flood Warning for Kauai until 1:30 a.m.

  • At 10:18 pm, a Gage on the Hanalei River showed a rapid rise in water level from heavy rain 7 miles south of Hanalei, or about 13 miles northwest of Lihue. The area of heavy rain moved downstream along with the crest of flood water. Other Heavy showers developed elsewhere on the island, putting most Low-lying areas at risk.

  • This warning is for the entire island of Kauai. Persons near the Hanalei River and other rivers and streams should remain vigilant for flash flooding. This Flash Flood Warning replaces the Flood Advisory that was in effect for the island of Kauai in Kauai County. This warning may need to be extended beyond 1:30 am if Flash Flooding persists.

Update 6:10 p.m.

A Flash Flood Watch continues for Kauai, Niihau and Oahu.

An upper level low north of the islands is bringing unstable air to Kauai and Oahu through Tuesday afternoon.

Locally heavy rainfall is possible, and the unstable atmosphere could also produce thunderstorms over the watch area. Rainfall rates in excess of 2 inches per hour are possible at times, which could lead to flash flooding.

Heavy Rain Over Kauai and Oahu Monday have saturated some areas, making flooding more likely should additional heavy rainfall Move over those saturated areas.

Update 11 a.m.

An upper level disturbance approaching the islands from the northeast is bringing heavier showers through Tuesday, especially concentrated on the North and East shores of the smaller islands.

The focus of rain Monday morning has been over the windward sides of all islands and over Oahu where we've seen moderate to heavy rain being measured on the radar over Kahuku, Laie through Temple Valley and stacked up against the Koolau. 

During the next few hours more showers will come onshore to northeast Oahu, as well as, Kauai.

The upper low-pressure area can be seen as a swirl in the water vapor imagery to the north of Maui County and the closer to the center of this low is where the most unstable air is located. 

Right now, the center of this low is triggering lightning and thunder over our northern coastal waters.

It is tracking towards Kauai the next couple of days, as it sags south and the center of the low gets closer to the Hawaiian Island Chain, that's when we will see more action in the way of thunderstorms associated with this cold upper level low interacting with the warmer ocean surface. 

A chance for isolated thunderstorms for the western half of the state is in the forecast through Wednesday morning, but weather models indicate the most active weather to come later this afternoon into Tuesday.

Our Severe Weather Team says the disturbance could increase the coverage and intensity of showers, mainly for windward and mauka areas of the smaller islands and even thunderstorms over Northern Oahu and parts of the Garden Isle.  It all depends on the location of the center of the low to where the most active weather will be associate with this disturbance.

Trade winds also are expected to diminish for a few days as a result, becoming more east-southeast at about 10 to 15 miles per hour before shifting a bit more northeasterly later in the week.  But keep in mind, in areas where isolated thunderstorms form, winds can be very gusty along with heavier brief downpours. 

The Severe Weather Team is expecting drier conditions as the low heads farther away from the island chain late Wednesday.  That is when we will be back on track of our typical trade wind weather.  Until then keep your umbrella handy!

Stay with HawaiiNewsNow.com for the latest updates you can also check out our Interactive radar.

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