Alert archive / Hawaii / Flash Flood Watches in 2013

Flash Flood Watch 9, NWS Honolulu, HI

September 30, 2013Honolulu County, Kauai County, Hawaii

NWS Honolulu, HI issued this flash flood watch at Sep 30, 2013, 10:24 AM HST for Honolulu County, Kauai County, Hawaii. It was in force for 29 hr.

The area

The counties it named.

The facts

Issued: Sep 30, 2013, 10:24 AM HST (20:24 UTC)
Expired: Oct 1, 2013, 3:38 PM HST
In force: 29 hr
Issued by: NWS Honolulu, HI
Flood severity: None

Counties Honolulu County, HI, Kauai County, HI

The radar

The South Kauai radar (PHKI), 76 km from the middle of the area, began a volume at 20:27 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Lihue, (PHLI), launched 12:00Z, 8.4 hours before the alert went out and 60 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: 1053 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 646 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: -33 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 watch went out at Sep 30, 10:00 AM HST, 24 minutes earlier.

Area forecast discussion, Sep 30, 10:00 AM HST, 24 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
Sep 30, 11:02 AM HST	Areal Flood Advisory	HFO	Kauai	3 hr
Sep 30, 11:36 AM HST	Flash Flood Warning	HFO	Kauai	3 hr
Sep 30, 1:10 PM HST	Areal Flood Advisory	HFO	Honolulu	110 min

Nearby

Flash Flood Watches in Hawaii, 2013 Every flash flood watch in 2013

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; radar from the NEXRAD Level II archive.