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Severe · Tropical Storm WarningActive alert

Tropical Storm Warning issued September 26 at 4:59AM HST by NWS Honolulu

Affecting Big Island Summit

In effect until: Sep 26, 2026, 11:00 PM

Big Island Summit

Likely impact; effects through 11:00 PM.

Secure your home and stay indoors. Have an emergency kit ready and monitor official updates.

Read the original bulletin (official text)
* LOCATIONS AFFECTED
- Mauna Kea Summit
- Mauna Loa Summit

* WIND
- LATEST LOCAL FORECAST: Equivalent Tropical Storm force wind
- Peak Wind Forecast: 35-45 mph with gusts to 55 mph
- Window for Tropical Storm force winds: until early this
afternoon

- THREAT TO LIFE AND PROPERTY THAT INCLUDES TYPICAL FORECAST
UNCERTAINTY IN TRACK, SIZE AND INTENSITY: Potential for wind 39
to 57 mph
- The wind threat has remained nearly steady from the
previous assessment.
- PLAN: Plan for hazardous wind of equivalent tropical storm
force.
- PREPARE: Last minute efforts to protect property should now
be complete. The area remains subject to limited wind
damage.
- ACT: Now is the time to shelter from hazardous wind.

- POTENTIAL IMPACTS: Unfolding
- Potential impacts from the main wind event are unfolding.

* FLOODING RAIN
- LATEST LOCAL FORECAST: Flood Watch is in effect
- Peak Rainfall Amounts: Additional around 1 inch

- THREAT TO LIFE AND PROPERTY THAT INCLUDES TYPICAL FORECAST
UNCERTAINTY IN TRACK, SIZE AND INTENSITY: Potential for
localized flooding rain
- The flooding rain threat has decreased from the previous
assessment.
- PLAN: Emergency plans should include the potential for
localized flooding from heavy rain.
- PREPARE: Consider protective actions if you are in an area
vulnerable to flooding.
- ACT: Heed any flood watches and warnings.

- POTENTIAL IMPACTS: Limited
- Localized rainfall flooding may prompt a few evacuations.
- Rivers and tributaries may quickly rise with swifter
currents. Small streams, creeks, canals, arroyos, and
ditches may become swollen and overflow in spots.
- Flood waters can enter a few structures, especially in
usually vulnerable spots. A few places where rapid ponding
of water occurs at underpasses, low-lying spots, and poor
drainage areas. Several storm drains and retention ponds
become near-full and begin to overflow. Some brief road and
bridge closures.

* TORNADO
- LATEST LOCAL FORECAST:
- Situation is somewhat favorable for tornadoes

- THREAT TO LIFE AND PROPERTY THAT INCLUDES TYPICAL FORECAST
UNCERTAINTY IN TRACK, SIZE AND INTENSITY: Potential for a few
tornadoes
- The tornado threat has remained nearly steady from the
previous assessment.
- PLAN: Emergency plans should continue to include possible
tornadoes.
- PREPARE: Stay within your shelter keeping informed of the
latest tornado situation.
- ACT: Move quickly to the safest place within your shelter
if a tornado warning is issued.

- POTENTIAL IMPACTS: Limited
- The occurrence of isolated tornadoes can hinder the
execution of emergency plans during tropical events.
- A few places may experience tornado damage, along with
power and communications disruptions.
- Locations could realize roofs peeled off buildings,
chimneys toppled, mobile homes pushed off foundations or
overturned, large tree tops and branches snapped off,
shallow-rooted trees knocked over, moving vehicles blown
off roads, and small boats pulled from moorings.

* FOR MORE INFORMATION:
- https://www.weather.gov/hfo
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™