Alert archive / Hawaii / Flash Flood Warnings in 2026

Flash Flood Warning 23, NWS Honolulu, HI

March 21, 2026Kalawao County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Mar 21, 2026, 11:32 AM HST for Kalawao County, Hawaii. It was in force for 5 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 21, 2026, 11:32 AM HST (21:32 UTC)
Expired: Mar 21, 2026, 4:32 PM HST
In force: 5 hr
Issued by: NWS Honolulu, HI
Area: Storm-based polygon
Flood severity: None

County Kalawao County, HI

The nearest sounding before it

Lihue, (PHLI), launched 12:00Z, 9.5 hours before the alert went out and 263 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 276 J/kg
Mixed-layer CIN: -133 J/kg
Mixed-layer LCL: 829 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 107 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

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 21, 9:18 AM HST, 2 hours 14 minutes earlier.

Area forecast discussion, Mar 21, 9:18 AM HST, 2 hours 14 minutes before

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In the hours before

Special weather statement, Mar 21, 7:29 AM HST, 4 hours 3 minutes before

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<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.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 20, 2:03 PM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Mar 20, 3:41 PM HST	Winter Storm Watch	HFO	Hawaii	17 hr
Mar 20, 6:25 PM HST	Special Marine Warning	HFO		2 hr
Mar 20, 8:22 PM HST	Special Marine Warning	HFO		113 min
Mar 20, 9:32 PM HST	Special Marine Warning	HFO		29 min
Mar 20, 9:35 PM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Mar 20, 10:50 PM HST	Small Craft Advisory	HFO		29 hr
Mar 20, 10:51 PM HST	High Surf Advisory	HFO	Honolulu, Kauai	29 hr
Mar 20, 11:34 PM HST	Flash Flood Warning Considerable damage threat	HFO	Kalawao	3 hr
Mar 21, 2:13 AM HST	Areal Flood Advisory	HFO	Kalawao	8 hr
Mar 21, 3:42 AM HST	Special Marine Warning	HFO		2 hr
Mar 21, 3:42 AM HST	Special Weather Statement	HFO	Honolulu	33 min
Mar 21, 4:55 AM HST	Flash Flood Warning	HFO	Honolulu	5 hr
Mar 21, 4:59 AM HST	Areal Flood Advisory	HFO	Kalawao	9 hr
Mar 21, 5:39 AM HST	Special Marine Warning	HFO		2 hr
Mar 21, 6:28 AM HST	Special Marine Warning	HFO		62 min
Mar 21, 7:24 AM HST	Special Marine Warning	HFO		51 min
Mar 21, 7:29 AM HST	Special Weather Statement	HFO		46 min
Mar 21, 8:11 AM HST	Special Marine Warning	HFO		64 min
Mar 21, 8:49 AM HST	Winter Storm Warning	HFO	Hawaii	42 hr
Mar 21, 9:09 AM HST	Special Marine Warning	HFO		66 min
Mar 21, 9:34 AM HST	Flash Flood Warning	HFO	Kalawao	6 hr
Mar 21, 9:49 AM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Mar 21, 10:53 AM HST	Special Marine Warning	HFO		97 min
Mar 21, 11:45 AM HST	Special Weather Statement	HFO	Kalawao	30 min
Mar 21, 11:57 AM HST	Flash Flood Warning	HFO	Kalawao	12 hr
Mar 21, 12:23 PM HST	Special Marine Warning	HFO		97 min

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; the sounding from the Mesonet's radiosonde archive.