Alert archive / Florida / Areal Flood Warnings in 2009

Areal Flood Warning 21, NWS Jacksonville, FL

May 20, 2009Flagler County, Florida

NWS Jacksonville, FL issued this areal flood warning at May 20, 2009, 12:01 PM EDT for Flagler County, Florida. It was in force for 27 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: May 20, 2009, 12:01 PM EDT (16:01 UTC)
Expired: May 21, 2009, 3:00 PM EDT
In force: 27 hr
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Flood severity: None

County Flagler County, FL

The radar

The Jacksonville radar (KJAX), 119 km from the middle of the area, began a volume at 16:03 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

Jacksonville, FL (KJAX), launched 12:00Z, 4.0 hours before the alert went out and 121 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: 10 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 853 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 185 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 areal flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jacksonville, FL wrote its last area forecast discussion before this areal flood warning went out at May 19, 3:12 PM EDT, 20 hours 49 minutes earlier.

Area forecast discussion, May 19, 3:12 PM EDT, 20 hours 49 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>

Hazardous weather outlook, May 19, 6:36 PM EDT, 17 hours 25 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 Jacksonville, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 20, 8:05 AM EDT	Areal Flood Advisory	JAX	Clay, Duval, Saint Johns	3 hr
May 20, 11:08 AM EDT	River Flood Warning	JAX	Clay	69 hr
May 20, 11:13 AM EDT	Special Weather Statement	JAX	Duval	32 min
May 20, 11:44 AM EDT	Areal Flood Advisory	JAX	Flagler	91 min
May 20, 11:54 AM EDT	Special Weather Statement	JAX	Flagler	66 min
May 20, 12:24 PM EDT	Areal Flood Advisory	JAX	Duval, Nassau	111 min
May 20, 1:49 PM EDT	Areal Flood Advisory	JAX	Duval, Saint Johns	116 min
May 20, 1:50 PM EDT	Areal Flood Advisory	JAX	Nassau	85 min
May 20, 1:54 PM EDT	Areal Flood Advisory	JAX	Clay, Flagler, Putnam, Saint Johns	2 hr
May 20, 2:40 PM EDT	Areal Flood Warning	JAX	Duval, Saint Johns	26 hr
May 20, 2:54 PM EDT	Lake Wind Advisory	JAX	Flagler, Nassau	28 hr
May 20, 3:08 PM EDT	Areal Flood Warning	JAX	Putnam	24 hr
May 20, 3:36 PM EDT	Areal Flood Advisory	JAX	Nassau	114 min
May 20, 4:19 PM EDT	Areal Flood Warning	JAX	Nassau	12 hr
May 20, 5:26 PM EDT	Areal Flood Warning	JAX	Clay	20 hr

Nearby

Areal Flood Warnings in Florida, 2009 Every areal flood warning in 2009

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.