Alert archive / Florida / Areal Flood Warnings in 2021

Areal Flood Warning 8, NWS Tampa Bay, FL

August 4, 20217 counties in Florida

NWS Tampa Bay, FL issued this areal flood warning at Aug 4, 2021, 1:55 PM EDT for 7 counties in Florida. It was in force for 22 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 4, 2021, 1:55 PM EDT (17:55 UTC)
Expired: Aug 5, 2021, 12:00 PM EDT
In force: 22 hr
Issued by: NWS Tampa Bay, FL
Area: Storm-based polygon
Flood severity: None

Counties Citrus County, FL, Hernando County, FL, Levy County, FL, Pasco County, FL, Pinellas County, FL, Polk County, FL, Sumter County, FL

The radar

The Tampa radar (KTBW), 89 km from the middle of the area, began a volume at 17:57 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 5.9 hours before the alert went out and 185 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: 315 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 951 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -60 m²/s²
0-3 km storm-relative helicity: -63 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 areal flood 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 areal flood warning went out at Aug 4, 1:45 PM EDT, 10 minutes earlier.

Area forecast discussion, Aug 4, 1:45 PM EDT, 10 minutes before

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In the hours before

Special weather statement, Aug 4, 12:36 PM EDT, 1 hour 19 minutes before

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<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.

Issued	Product	Office	Counties	Lasted
Aug 3, 11:05 PM EDT	Areal Flood Advisory	TBW	Hillsborough	115 min
Aug 4, 2:01 AM EDT	Areal Flood Advisory	TBW	Hillsborough, Manatee	59 min
Aug 4, 3:32 AM EDT	Areal Flood Advisory	TBW	Manatee	118 min
Aug 4, 4:02 AM EDT	Areal Flood Advisory	TBW	Citrus, Hernando	118 min
Aug 4, 5:08 AM EDT	Special Marine Warning	TBW		37 min
Aug 4, 5:10 AM EDT	Special Weather Statement	TBW	Pinellas	50 min
Aug 4, 5:28 AM EDT	Areal Flood Advisory	TBW	Citrus, Levy	2 hr
Aug 4, 5:33 AM EDT	Special Weather Statement	TBW	Hillsborough	42 min
Aug 4, 6:47 AM EDT	Areal Flood Advisory	TBW	Manatee	118 min
Aug 4, 7:44 AM EDT	Areal Flood Advisory	TBW	Citrus, Levy	3 hr
Aug 4, 9:13 AM EDT	Areal Flood Advisory	TBW	Charlotte, Lee	3 hr
Aug 4, 9:35 AM EDT	River Flood Warning	TBW	Hillsborough	37 hr
Aug 4, 2:38 PM EDT	Special Marine Warning	TBW		67 min
Aug 4, 4:16 PM EDT	River Flood Warning	TBW	Pasco	21 days

Nearby

Areal Flood Warnings in Florida, 2021 Every areal flood warning in 2021

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.