Alert archive / Georgia / Flash Flood Watches in 2018

Flash Flood Watch 2, NWS Jacksonville, FL

October 10, 20185 counties in Georgia

NWS Jacksonville, FL issued this flash flood watch at Oct 10, 2018, 3:20 AM EDT for 5 counties in Georgia. It took effect at Oct 10, 2018, 2:00 PM EDT. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued
Oct 10, 2018, 3:20 AM EDT (07:20 UTC)
In effect from
Oct 10, 2018, 2:00 PM EDT
Expired
Oct 11, 2018, 1:21 AM EDT
In force
11 hr
Issued by
NWS Jacksonville, FL
Flood severity
None

Counties Appling County, GA, Atkinson County, GA, Bacon County, GA, Coffee County, GA, Jeff Davis County, GA

The radar

The Moody AFB radar (KVAX), 86 km from the middle of the area, began a volume at 07:21 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

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 7.3 hours before the alert went out and 208 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, Tallahassee Rgnl, FL at 00:00Z on 2018-10-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 889 joules per kilogram.LCLLFCEL10008507005003002001001 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, Tallahassee Rgnl, FL at 00:00Z on 2018-10-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 115 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
889 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
754 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
115 m²/s²
0-3 km storm-relative helicity
177 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 Jacksonville, FL wrote its last area forecast discussion before this flash flood watch went out at Oct 9, 9:13 PM EDT, 6 hours 7 minutes earlier.

Area forecast discussion, Oct 9, 9:13 PM EDT, 6 hours 7 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 10, 9:29 AM EDTSpecial Weather StatementJAXAlachua, Marion61 min
Oct 10, 1:21 PM EDTSpecial Weather StatementJAXDuval, Saint Johns54 min
Oct 10, 2:10 PM EDTSpecial Weather StatementJAXDuval65 min
Oct 10, 2:31 PM EDTSpecial Weather StatementJAXBradford59 min
Oct 10, 2:42 PM EDTTornado WarningJAXBradford, Clay33 min
Oct 10, 3:10 PM EDTTornado Warning Tornado observedJAXBradford, Clay, Duval, Nassau39 min
Oct 10, 3:20 PM EDTSpecial Weather StatementJAXClay, Flagler, Marion, Putnam, Saint Johns85 min
Oct 10, 3:39 PM EDTSpecial Weather StatementJAXNassau51 min
Oct 10, 3:45 PM EDTSpecial Weather StatementJAXAlachua, Baker, Bradford, Union60 min
Oct 10, 3:56 PM EDTSpecial Marine WarningJAX94 min
Oct 10, 4:05 PM EDTSevere Thunderstorm WarningJAXDuval, Saint Johns40 min
Oct 10, 4:10 PM EDTTornado WarningJAXAlachua, Bradford, Clay, Putnam50 min
Oct 10, 4:37 PM EDTTornado WarningJAXNassau38 min
Oct 10, 4:44 PM EDTSevere Thunderstorm WarningJAXDuval, Nassau46 min
Oct 10, 4:48 PM EDTSpecial Weather StatementJAXFlagler42 min
Oct 10, 4:49 PM EDTSpecial Marine WarningJAX41 min
Oct 10, 5:22 PM EDTSpecial Marine WarningJAX83 min
Oct 10, 5:22 PM EDTSpecial Weather StatementJAXMarion53 min
Oct 10, 6:47 PM EDTSpecial Marine WarningJAX58 min
Oct 10, 6:49 PM EDTSpecial Weather StatementJAXFlagler26 min
Oct 10, 7:30 PM EDTSpecial Marine WarningJAX60 min
Oct 10, 2:08 PM EDTHurricane WarningJAXAtkinson, Coffee, Jeff Davis9 hr
Oct 10, 4:10 PM EDTTornado WarningJAXBrantley, Charlton, Pierce, Ware35 min
Oct 10, 4:44 PM EDTTornado WarningJAXBrantley, Charlton31 min
Oct 10, 7:43 PM EDTSpecial Weather StatementJAXLanier32 min

Nearby

Flash Flood Watches in Georgia, 2018Every flash flood watch 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.