Alert archive / Alabama / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 235, NWS Mobile, AL

November 20, 1999Baldwin County, Alabama; Escambia County, Florida

NWS Mobile, AL issued this severe thunderstorm warning at Nov 20, 1999, 11:39 AM CST for Baldwin County, Alabama; Escambia County, Florida. It was in force for 81 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: Nov 20, 1999, 11:39 AM CST (17:39 UTC)
Expired: Nov 20, 1999, 1:00 PM CST
In force: 81 min
Issued by: NWS Mobile, AL
Area: Whole counties

Counties Baldwin County, AL, Escambia County, FL

What was reported inside it

Time	Report	Where	Remark
Nov 20, 11:45 AM CST	Thunderstorm Wind 50	Molino, FL	High winds associated with thunderstorms passed through Molino, FL. No damage was reported.

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

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.7 hours before the alert went out and 211 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: 33 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 955 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Mobile, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at Nov 20, 10:35 AM CST, 1 hour 4 minutes earlier.

Area forecast discussion, Nov 20, 10:35 AM CST, 1 hour 4 minutes before

AREA FORECAST DISCUSSION...MESOSCALE UPDATE
NATIONAL WEATHER SERVICE MOBILE AL
1035 AM CST SAT NOV 20 1999

UPPER TROF PASSING OVER AREA TODAY...RAIN AND THUNDERSTORMS SHOULD
END FROM WEST TO EAST LATER THIS AFTERNOON OR EARLY EVENING. WILL
ADJUST ZONES TO REFLECT CURRENT RADAR TRENDS. SURFACE FRONT EXPECTED
TO BECOME STATIONARY AND DISSIPATE BEFORE MOVING ACROSS THE AREA.
WOULD EXPECT FOG TONIGHT WITH THE WET GROUND AND MOIST AIR MASS.

.MOB...
AL...NONE.
FL...NONE.
MS...NONE.

In the hours before

Special weather statement, Nov 20, 5:50 AM CST, 5 hours 49 minutes before

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Special weather statement, Nov 20, 5:50 AM CST, 5 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.
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The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 20, 11:58 AM CST	Severe Thunderstorm Warning	MOB	Santa Rosa	77 min

Nearby

Severe Thunderstorm Warnings in Alabama, 1999 Severe Thunderstorm Warnings in Florida, 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.