Hydrologic Outlook — Hawaii in Hawaii County, Hawaii
The National Weather Service issues this alert when conditions in the area meet its criteria — check the details below for what to expect.
Current Status
⚠️ Active: Hydrologic Outlook
Hydrologic Outlook issued August 12 at 3:22PM HST by NWS Honolulu HI
ESFHFO The latest forecast for Potential Tropical Cyclone One-C takes the system over the state as a strong tropical storm. While One-C is expected to move steadily west-northwest as it passes through the island chain, abundant moisture drawn into the circulation will bring the potential for very heavy rainfall and flash flooding from late Friday into the weekend across the state. While the details on the timing and rainfall amounts will highly depend on the eventual track of the tropical cyclone, we could see widespread rainfall of 5 to 10 inches. Locally higher amounts will be possible, especially over the windward areas of Maui and the Big Island. Keep up to date with the latest forecast information online at weather.gov/hawaii, through local media, social media, or NOAA Weather Radio broadcasts. An updated outlook will be issued by 5 PM HST Thursday unless superseded by a Flood Watch.
Effective August 12, 2026 at 9:22 PM ET · Expires August 13, 2026 at 11:00 PM ET
Event Details
Event Type
Hydrologic Outlook
Severity
unknown
Issued By
NWS Honolulu HI
Expires
August 13, 2026 at 11:00 PM ET
Last Checked
just now
Also In Effect For
This same Hydrologic Outlook also covers:
Other Active Alerts in Hawaii
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Get Hydrologic Outlook Alerts for Hawaii in Hawaii County
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Frequently Asked Questions
What does a Hydrologic Outlook mean for Hawaii in Hawaii County, Hawaii?
The National Weather Service issues this alert when conditions in the area meet its criteria — check the details below for what to expect.
Is this Hydrologic Outlook currently active?
Yes — this alert is active as of our last check (just now). It's set to expire August 13, 2026 at 11:00 PM ET.
How do I get notified about Hydrologic Outlook alerts for Hawaii in Hawaii County?
Download StormCast free on Google Play and set Hawaii in Hawaii County, Hawaii as one of your monitored locations. StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.
What other areas does this alert cover?
This same Hydrologic Outlook is also in effect for Maui County, Kauai County, Oahu in Honolulu County.