Alert archive / Florida / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 53, NWS Tampa Bay, FL

May 9, 1999Polk County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at May 9, 1999, 7:08 PM EDT for Polk County, Florida. It was in force for 47 min. 3 reports 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 9, 1999, 7:08 PM EDT (23:08 UTC)
Expired
May 9, 1999, 7:55 PM EDT
In force
47 min
Issued by
NWS Tampa Bay, FL
Area
Whole counties

County Polk County, FL

What was reported inside it

TimeReportWhereRemark
May 9, 7:43 PM EDTThunderstorm WindBartow, FLThe Bartow Police Department reported that thunderstorm winds downed a large tree which damaged the roof of a home in Bartow. Thunderstorm winds also downed power lines across Bartow.
May 9, 8:00 PM EDTThunderstorm WindWaverly, FLPolk County Emergency Management reported that thunderstorm winds downed several power lines near the intersection of U.S. Highway 27 and State Road 570 near Waverly.
May 9, 8:05 PM EDTThunderstorm WindLake Wales, FLThe Peace River Electric Company reported several power lines were downed by thunderstorm winds along Old U.S. Highway 27 (Old Scenic Highway) in Lake Wales.

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

Tampa Bay, FL (KTBW), launched 12:00Z, 11.1 hours before the alert went out and 74 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, Tampa Bay, FL at 12:00Z on 1999-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 929 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, Tampa Bay, FL at 12:00Z on 1999-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 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
929 J/kg
Mixed-layer CIN
-130 J/kg
Mixed-layer LCL
1185 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
16 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 Tampa Bay, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at May 9, 2:00 PM EDT, 5 hours 8 minutes earlier.

Area forecast discussion, May 9, 2:00 PM EDT, 5 hours 8 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAMPA BAY-RUSKIN FL
200 PM EDT SUN MAY 9 1999

CURRENTLY: WATCH HAS US HOPPING SO DISCUSSION WILL BE BRIEF.
CONVECTION FORMING ON WEST COAST SEABREEZE WITH MOTION BASED AS MUCH
ON PROPOGATION AS IT IS ON ADVECTION WITH LIGHT WINDS HOLDING BACK
STEERING. STORMS SHOULD GRADUALLY MOVE INLAND THROUGH THE AFTERNOON
AND EARLY EVENING. HAIL WILL AGAIN BE THE BIGGEST THREAT.

FORECAST: 3 MODELS GIVE 3 DIFFERENT SOLUTIONS ON EVOLUTION OF UPPER
LOW OVER THE SOUTHEAST DURING THE NEXT 2 DAYS. I HAVE SEEN IN THE
PAST THAT THE AVN MODEL TENDS TO DO BEST WITH THESE TYPES OF CUTOFFS
...SO WOULD LEAN TOWARD THAT SOLUTION. THIS PUTS THE CUTOFF THE
FARTHEST WEST AND RIGHT OVER THE STATE. THE POSITION WILL KEEP
SCATTERED DIURNAL CONVECTION GOING THROUGH THE FORECAST PERIOD AS
COLD TEMPS ALOFT CONTRIBUTE TO CONTINUING INSTABILITY.

TPA 67/88/67/88 1313
FMY 69/90/69/90 1313
LAL 66/90/66/90 2424

ALSHEIMER

In the hours before

Local storm report, May 9, 6:43 PM EDT, 25 minutes before
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Local storm report, May 9, 6:43 PM EDT, 25 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 Tampa Bay, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 9, 1:05 PM EDTSevere Thunderstorm WarningTBWDeSoto40 min
May 9, 1:24 PM EDTSevere Thunderstorm WarningTBWManatee36 min
May 9, 2:15 PM EDTSevere Thunderstorm WarningTBWManatee45 min
May 9, 2:25 PM EDTSevere Thunderstorm WarningTBWLee50 min
May 9, 2:45 PM EDTSevere Thunderstorm WarningTBWHighlands45 min
May 9, 3:15 PM EDTSevere Thunderstorm WarningTBWLee45 min
May 9, 4:00 PM EDTSevere Thunderstorm WarningTBWLee30 min
May 9, 4:08 PM EDTSevere Thunderstorm WarningTBWPolk37 min
May 9, 6:15 PM EDTSevere Thunderstorm WarningTBWPolk30 min
May 9, 7:42 PM EDTSevere Thunderstorm WarningTBWDeSoto48 min
May 9, 7:55 PM EDTSevere Thunderstorm WarningTBWPolk35 min

Nearby

Severe Thunderstorm Warnings in Florida, 1999Every 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.