Alert archive / Florida / Areal Flood Advisories in 2021

Areal Flood Advisory 96, NWS Melbourne, FL

November 21, 2021Saint Lucie County, Florida

NWS Melbourne, FL issued this areal flood advisory at Nov 21, 2021, 8:38 AM EST for Saint Lucie County, Florida. It was in force for 112 min.

The area

The counties it named.

The facts

Issued: Nov 21, 2021, 8:38 AM EST (13:38 UTC)
Expired: Nov 21, 2021, 10:30 AM EST
In force: 112 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

County Saint Lucie County, FL

The radar

The Melbourne radar (KMLB), 84 km from the middle of the area, began a volume at 13:39 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, 1.6 hours before the alert went out and 121 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: 170 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 879 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 154 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 advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Melbourne, FL wrote its last area forecast discussion before this areal flood advisory went out at Nov 21, 4:24 AM EST, 4 hours 14 minutes earlier.

Area forecast discussion, Nov 21, 4:24 AM EST, 4 hours 14 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>

Hazardous weather outlook, Nov 21, 5:01 AM EST, 3 hours 37 minutes before

Hazardous Weather Outlook
National Weather Service Melbourne FL
501 AM EST Sun Nov 21 2021

AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141-
144-147-220000-
Flagler Beach to Volusia-Brevard County Line 0-20 nm-Volusia-
Brevard County Line to Sebastian Inlet 0-20 nm-
Sebastian Inlet to Jupiter Inlet 0-20 nm-Flagler Beach to Volusia-
Brevard County Line 20-60 nm-Volusia-
Brevard County Line to Sebastian Inlet 20-60 nm-
Sebastian Inlet to Jupiter Inlet 20-60 nm-Inland Volusia-
Northern Lake-Orange-Seminole-Southern Brevard-Osceola-
Indian River-Okeechobee-St. Lucie-Martin-Coastal Volusia-
Southern Lake-Northern Brevard-
501 AM EST Sun Nov 21 2021

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA.

.DAY ONE...TODAY AND TONIGHT.

.WIND AND SEA IMPACT...
East-northeast winds of around 20 knots will continue to produce
seas of 6 to 8 feet near shore and 9 to 10 feet well offshore.
A Small Craft Advisory continues for all of the local Atlantic
waters.

.RIP CURRENT IMPACT...
A High Risk of potentially life-threatening rip currents continues
at the central Florida Atlantic beaches. While rip currents will
be present all day, the threat will be highest between 12 noon and
6 PM due to tidal effects. Additionally, rough pounding surf with
large breaking waves of 5 to 6 feet will also continue. Entering
the surf is strongly discouraged due to the dangerous surf and rip
current conditions.

.THUNDERSTORM IMPACT...
A few lightning storms will be possible today offshore the Space
and Treasure Coasts, and over land areas south of Melbourne and
Kenansville, which could produce wind gusts of 30 to 40 mph and
torrential downpours. Move indoors to safety if skies look
threatening, or you hear thunder.

.FLOOD IMPACT...
Rainfall amounts of 1 to 3 inches will be possible in persistent
heavy showers over the Treasure Coast Counties of Indian River,
Saint Lucie and Martin today. this may cause ponding of water on
roads and other poorly drained urban and low lying areas.

.MARINE THUNDERSTORM GUST IMPACT...
A few gusty showers or storms could produce wind gusts to 35 knots
over the local Atlantic waters, Intracoastal Waterway and inland
lakes from Brevard County southward today. Boaters should watch for
fast moving showers or isolated storms approaching rapidly from the
east today.

.RIVER FLOOD IMPACT...
The Saint Johns River at Astor is forecast to remain in Action
Stage this week. There is the possibility of the river at Astor
rising back above Flood Stage Tuesday and Wednesday due to strong
northerly winds behind a cold front which will sweep through
central Florida Monday night.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.
Winds and seas will become hazardous for small craft operation
once again late Monday night through the wednesday due to strong
north to northeast winds and building seas behind a strong cold
front which will sweep across the local Atlantic Monday night.
Rough, choppy surf will likely redevelop along area beaches. The
rip current threat will be Moderate Monday and could become high
through mid week.

Behind Monday night's strong cold front lows will dip into the
40s and lower 50s across much of the region early Tuesday and
Wednesday mornings.

.SPOTTER INFORMATION STATEMENT...
Spotter activation will not be needed today and tonight.

Cristaldi

In the hours before

Local storm report, Nov 21, 8:22 AM EST, 16 minutes before

PRELIMINARY LOCAL STORM REPORT
National Weather Service Melbourne FL
822 AM EST SUN NOV 21 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0820 AM     HEAVY RAIN       5 SSE JENSEN BEACH      27.18N 80.19W
11/21/2021  M3.20 INCH       Martin             FL   MESONET

            WEATHER UNDERGROUND SITE KFLSTUAR99 NEAR SEWALLS POINT
            REPORTED 3.20 INCHES RAINFALL SINCE MIDNIGHT.

&&

JCP

The office that day

Everything else NWS Melbourne, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 21, 12:21 PM EST	Areal Flood Advisory	MLB	Saint Lucie	114 min
Nov 21, 1:00 PM EST	Areal Flood Advisory	MLB	Saint Lucie	75 min
Nov 21, 1:37 PM EST	Areal Flood Warning	MLB	Saint Lucie	27 min
Nov 21, 2:04 PM EST	Flash Flood Warning	MLB	Saint Lucie	3 hr
Nov 21, 2:32 PM EST	Areal Flood Warning	MLB	Saint Lucie	2 hr
Nov 21, 3:36 PM EST	Areal Flood Advisory	MLB	Martin, Saint Lucie	84 min
Nov 21, 5:00 PM EST	Areal Flood Warning	MLB	Saint Lucie	2 hr

Nearby

Areal Flood Advisories in Florida, 2021 Every areal flood advisory 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.