Alert archive / Hawaii / Flash Flood Warnings in 2026

Flash Flood Warning 18, NWS Honolulu, HI

March 20, 2026Honolulu County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Mar 20, 2026, 8:22 AM HST for Honolulu County, Hawaii. It was in force for 29 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Mar 20, 2026, 8:22 AM HST (18:22 UTC)
Expired: Mar 21, 2026, 1:15 PM HST
In force: 29 hr
Issued by: NWS Honolulu, HI
Area: Storm-based polygon
Flood severity: Unknown

County Honolulu County, HI

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Honolulu, HI wrote its last area forecast discussion before this flash flood warning went out at Mar 20, 4:06 AM HST, 4 hours 16 minutes earlier.

Area forecast discussion, Mar 20, 4:06 AM HST, 4 hours 16 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

In the hours before

Local storm report, Mar 20, 5:09 AM HST, 3 hours 13 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Mar 20, 7:49 AM HST, 33 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

Everything else NWS Honolulu, HI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 19, 6:05 PM HST	Areal Flood Advisory	HFO	Honolulu	8 hr
Mar 19, 10:57 PM HST	Flash Flood Warning Emergency	HFO	Honolulu	30 hr
Mar 20, 5:00 AM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Mar 20, 8:00 AM HST	Areal Flood Advisory	HFO	Honolulu	3 hr
Mar 20, 10:37 AM HST	Flash Flood Warning	HFO	Honolulu	19 hr
Mar 20, 11:30 AM HST	Areal Flood Advisory	HFO	Kalawao	6 hr
Mar 20, 1:28 PM HST	Areal Flood Advisory	HFO	Kalawao	9 hr

Nearby

Flash Flood Warnings in Hawaii, 2026 Every flash flood warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.