Alert archive / Florida / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 70, NWS Jacksonville, FL

March 19, 1998Columbia County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Mar 19, 1998, 11:35 AM EST for Columbia County, Florida. It was in force for 65 min. 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 19, 1998, 11:35 AM EST (16:35 UTC)
Expired: Mar 19, 1998, 12:40 PM EST
In force: 65 min
Issued by: NWS Jacksonville, FL
Area: Whole counties

County Columbia County, FL

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 4.6 hours before the alert went out and 94 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: 262 J/kg
Mixed-layer CIN: -106 J/kg
Mixed-layer LCL: 579 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 125 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Mar 19, 10:09 AM EST, 1 hour 26 minutes earlier.

Area forecast discussion, Mar 19, 10:09 AM EST, 1 hour 26 minutes before

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In the hours before

Special weather statement, Mar 19, 6:00 AM EST, 5 hours 35 minutes before

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Special weather statement, Mar 19, 6:00 AM EST, 5 hours 35 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.
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      <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 Jacksonville, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 18, 10:21 PM EST	Flash Flood Warning	JAX	Marion	4 hr
Mar 18, 10:57 PM EST	Severe Thunderstorm Warning	JAX	Putnam	63 min
Mar 19, 9:10 AM EST	Severe Thunderstorm Warning	JAX	Marion	60 min
Mar 19, 3:03 PM EST	Flash Flood Warning	JAX	Marion	6 hr

Nearby

Severe Thunderstorm Warnings in Florida, 1998 Every severe thunderstorm warning in 1998

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.