Alert archive / Georgia / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 33, NWS Charleston, SC

May 6, 1999Effingham County, Georgia

NWS Charleston, SC issued this severe thunderstorm warning at May 6, 1999, 2:35 PM EDT for Effingham County, Georgia. It was in force for 60 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: May 6, 1999, 2:35 PM EDT (18:35 UTC)
Expired: May 6, 1999, 3:35 PM EDT
In force: 60 min
Issued by: NWS Charleston, SC
Area: Whole counties

County Effingham County, GA

The radar

The Charleston,SC radar (KCLX), 43 km from the middle of the area, began a volume at 18:36 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.

What was reported inside it

Time	Report	Where	Remark
May 6, 3:05 PM EDT	Hail 1.75	Rincon, GA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 6.6 hours before the alert went out and 139 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: 479 J/kg
Mixed-layer CIN: -203 J/kg
Mixed-layer LCL: 961 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.4

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 Charleston, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at May 6, 10:04 AM EDT, 4 hours 31 minutes earlier.

Area forecast discussion, May 6, 10:04 AM EDT, 4 hours 31 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>

In the hours before

Special weather statement, May 6, 11:54 AM EDT, 2 hours 41 minutes before

GAZ087-088-099>101-114>119-137>141-SCZ040-042>045-047>050-062200-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHARLESTON SC
1154 AM EDT THU MAY 6 1999

...ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE LATER THIS AFTERNOON
   AND EVENING ACROSS PARTS OF SOUTHEAST GEORGIA AND SOUTHERN SOUTH
   CAROLINA...

AN UPPER AIR DISTURBANCE PASSING WEST OF THE REGION COMBINED WITH
A VERY WARM AND UNSTABLE AIR MASS WILL ASSIST THUNDERSTORM
DEVELOPMENT OVER INLAND AREAS THIS AFTERNOON. A FEW THUNDERSTORMS
COULD PRODUCE LOCALIZED WIND GUSTS IN EXCESS OF 60 MPH AND LARGE
HAIL.

THE GREATEST THREAT OF ISOLATED SEVERE THUNDERSTORMS WILL OCCUR OVER
EAST CENTRAL GEORGIA AND THE SOUTHERN MIDLANDS OF SOUTH CAROLINA
THROUGH THE AFTERNOON. HOWEVER ISOLATED SEVERE STORMS COULD DEVELOP
IN A CORRIDOR FROM REIDSVILLE AND MILLEN IN SOUTHEAST GEORGIA TO
LOCATIONS WEST OF INTERSTATE 95 IN SOUTHERN SOUTH CAROLINA BETWEEN 3
AND 6 PM THIS AFTERNOON. THESE POTENTIALLY STRONG TO SEVERE STORMS
COULD AFFECT COASTAL AREAS AFTER 6 PM AND INTO THE EVENING.

SPOTTER ACTIVATION IS NOT EXPECTED LATER THIS AFTERNOON OR EVENING...
BUT MAY BE NEEDED DEPENDING ON HOW THIS EVENT UNFOLDS. TO STAY
INFORMED...LISTEN TO THE LATEST STATEMENTS AND SHORT TERM FORECASTS
FROM THE NATIONAL WEATHER SERVICE IN CHARLESTON ON NOAA WEATHER RADIO
OR FROM LOCAL MEDIA OUTLETS.

TJR

The office that day

Everything else NWS Charleston, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 6, 3:06 PM EDT	Severe Thunderstorm Warning	CHS	Jasper	49 min
May 6, 3:27 PM EDT	Severe Thunderstorm Warning	CHS	Beaufort	63 min
May 6, 2:28 PM EDT	Severe Thunderstorm Warning	CHS	Bryan	47 min
May 6, 2:54 PM EDT	Severe Thunderstorm Warning	CHS	Bryan	31 min
May 6, 3:02 PM EDT	Severe Thunderstorm Warning	CHS	Liberty	48 min
May 6, 3:06 PM EDT	Severe Thunderstorm Warning	CHS	Chatham	49 min
May 6, 4:29 PM EDT	Severe Thunderstorm Warning	CHS	Liberty	31 min
May 6, 4:35 PM EDT	Severe Thunderstorm Warning	CHS	Long	50 min
May 6, 5:09 PM EDT	Severe Thunderstorm Warning	CHS	Liberty	51 min
May 6, 5:25 PM EDT	Severe Thunderstorm Warning	CHS	Bryan	45 min

Nearby

Severe Thunderstorm Warnings in Georgia, 1999 Every severe thunderstorm warning in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.