Alert archive / Florida / High Surf Advisories in 2018

High Surf Advisory 4, NWS Jacksonville, FL

October 9, 2018Duval County, Flagler County, Nassau County, Florida; Camden County, Glynn County, Georgia

NWS Jacksonville, FL issued this high surf advisory at Oct 9, 2018, 3:07 AM EDT for Duval County, Flagler County, Nassau County, Florida; Camden County, Glynn County, Georgia. It took effect at Oct 9, 2018, 8:00 AM EDT. It was in force for 45 hr.

The area

The counties it named.

The facts

Issued
Oct 9, 2018, 3:07 AM EDT (07:07 UTC)
In effect from
Oct 9, 2018, 8:00 AM EDT
Expired
Oct 11, 2018, 4:30 AM EDT
In force
45 hr
Issued by
NWS Jacksonville, FL

Counties Duval County, FL, Flagler County, FL, Nassau County, FL, Camden County, GA, Glynn County, GA

The radar

The Jacksonville radar (KJAX), 13 km from the middle of the area, began a volume at 07:08 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

Cape Canaveral, FL (KXMR), launched 00:00Z, 7.1 hours before the alert went out and 249 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-pSkew-T log-p diagram, Cape Canaveral, FL at 00:00Z on 2018-10-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1217 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cape Canaveral, FL at 00:00Z on 2018-10-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1217 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
805 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
63 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 high surf advisory 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 high surf advisory went out at Oct 8, 9:44 PM EDT, 5 hours 23 minutes earlier.

Area forecast discussion, Oct 8, 9:44 PM EDT, 5 hours 23 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.

IssuedProductOfficeCountiesLasted
Oct 9, 4:45 AM EDTSpecial Marine WarningJAX90 min
Oct 9, 6:55 AM EDTSpecial Marine WarningJAX65 min
Oct 9, 6:58 AM EDTSpecial Weather StatementJAXSaint Johns32 min
Oct 9, 7:27 AM EDTSpecial Marine WarningJAX2 hr
Oct 9, 7:36 AM EDTSpecial Weather StatementJAXFlagler24 min
Oct 9, 8:59 AM EDTSpecial Weather StatementJAXDuval31 min
Oct 9, 9:02 AM EDTSpecial Weather StatementJAXSaint Johns28 min
Oct 9, 9:29 AM EDTSpecial Marine WarningJAX4 hr
Oct 9, 9:34 AM EDTSpecial Weather StatementJAXDuval, Flagler, Saint Johns56 min
Oct 9, 9:49 AM EDTTornado WarningJAXDuval, Saint Johns8 min
Oct 9, 10:10 AM EDTSpecial Weather StatementJAXDuval, Nassau50 min
Oct 9, 10:15 AM EDTSevere Thunderstorm WarningJAXDuval, Nassau16 min
Oct 9, 10:30 AM EDTSpecial Weather StatementJAXDuval, Flagler, Nassau, Saint Johns90 min
Oct 9, 11:18 AM EDTTropical Storm WarningJAXGilchrist, Suwannee42 hr
Oct 9, 12:40 PM EDTSpecial Weather StatementJAXFlagler50 min
Oct 9, 1:05 PM EDTSpecial Weather StatementJAXDuval, Nassau85 min
Oct 9, 1:18 PM EDTSpecial Marine WarningJAX4 hr
Oct 9, 5:13 PM EDTSpecial Weather StatementJAXMarion47 min
Oct 9, 11:43 AM EDTCoastal Flood WarningJAXCamden, Glynn28 hr
Oct 9, 12:07 PM EDTSpecial Weather StatementJAXCamden, Glynn53 min
Oct 9, 2:57 PM EDTSpecial Weather StatementJAXBrantley, Camden, Charlton48 min
Oct 9, 3:43 PM EDTSpecial Weather StatementJAXBrantley, Pierce47 min
Oct 9, 4:59 PM EDTAreal Flood AdvisoryJAXBrantley, Camden, Glynn, Pierce, Wayne2 hr

Nearby

High Surf Advisories in Florida, 2018High Surf Advisories in Georgia, 2018Every high surf advisory in 2018

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.