Alert archive / Florida / Areal Flood Advisories in 2021

Areal Flood Advisory 111, NWS Miami, FL

August 4, 2021Collier County, Florida

NWS Miami, FL issued this areal flood advisory at Aug 4, 2021, 11:15 AM EDT for Collier County, Florida. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Aug 4, 2021, 11:15 AM EDT (15:15 UTC)
Expired
Aug 4, 2021, 2:00 PM EDT
In force
3 hr
Issued by
NWS Miami, FL
Area
Storm-based polygon

County Collier County, FL

The radar

The Miami radar (KAMX), 111 km from the middle of the area, began a volume at 15:19 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

Miami, FL (KMFL), launched 12:00Z, 3.3 hours before the alert went out and 113 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, Miami, FL at 12:00Z on 2021-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 903 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, Miami, FL at 12:00Z on 2021-08-04The 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
903 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
991 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
60 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 Miami, FL wrote its last area forecast discussion before this areal flood advisory went out at Aug 4, 9:40 AM EDT, 1 hour 35 minutes earlier.

Area forecast discussion, Aug 4, 9:40 AM EDT, 1 hour 35 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, Aug 4, 9:42 AM EDT, 1 hour 33 minutes before
Hazardous Weather Outlook for South Florida...UPDATED
National Weather Service Miami FL
942 AM EDT Wed Aug 4 2021

AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676-
050100-
Lake Okeechobee-Biscayne Bay-
Coastal waters from Jupiter Inlet to Deerfield Beach FL out 20 NM-
Coastal waters from Deerfield Beach to Ocean Reef FL out 20 NM-
Waters from Jupiter Inlet to Deerfield Beach FL from 20 to 60 NM-
Waters from Deerfield Beach to Ocean Reef FL from 20 to 60 NM
excluding the territorial waters of Bahamas-Glades-Hendry-
Inland Palm Beach-Metro Palm Beach-Coastal Collier-Inland Collier-
Inland Broward-Metro Broward-Inland Miami-Dade-Metro Miami-Dade-
Mainland Monroe-Coastal Palm Beach-Coastal Broward-Coastal Miami-
Dade-Far South Miami-Dade-
Coastal waters from Chokoloskee to Bonita Beach FL out 20 NM-
Coastal waters from East Cape Sable to Chokoloskee FL out 20 NM-
Waters from Chokoloskee to Bonita Beach FL from 20 to 60 NM-
942 AM EDT Wed Aug 4 2021

...Scattered To Numerous Storms Expected With Heavy Rainfall...
...A Few Strong Storms Possible This Afternoon East Coast Metro Areas...

This hazardous weather outlook is for South Florida.

.DAY ONE...TODAY AND TONIGHT

Thunderstorms: Scattered to numerous thunderstorms are expected,
mainly this morning through early afternoon over Southwest Florida,
and from midday through the early evening across Southeast Florida.
Frequent lightning, heavy downpours, funnel clouds, and gusty winds
will be the primary potential hazards with the strongest
thunderstorms.

Flooding: Localized flooding is possible due to heavy downpours from
thunderstorms over low-lying and poor drainage areas, especially in
Southwest Florida this morning, and Southeast Florida this afternoon
and evening.

Wind: A few strong storms could produce wind gusts in excess of 45
mph.

Tornadoes: A weak tornado or two are possible along eastern areas
this afternoon.

Waterspouts: Waterspouts are possible across the South Florida
waters today, especially in the Atlantic waters and Biscayne Bay.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

Scattered to numerous showers and thunderstorms will be possible
across South Florida for the rest of this week and into the upcoming
weekend with the focus shifting to the interior and west coast metro
areas. In addition, a few strong storms could develop with locally
gusty winds, waterspouts, heavy rainfall, and frequent lightning
strikes.

.SPOTTER INFORMATION STATEMENT...

Widespread spotter activation is not anticipated, however individual
spotters are encouraged to report high wind, hail and flooding to
the National Weather Service forecast office in Miami.

For more information...visit the National Weather Service in
Miami website at www.weather.gov/miami.

Molleda

In the hours before

Local storm report, Aug 4, 10:40 AM EDT, 35 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MIAMI FL
1040 AM EDT WED AUG 4 2021

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

0810 PM     TSTM WND DMG     3 SSE KENDALE LAKES     25.67N 80.41W
08/03/2021                   MIAMI-DADE         FL   NWS EMPLOYEE

            A MEDIUM-LARGE TREE WAS UPROOTED NEAR THE
            INTERSECTION OF SW 130 AVENUE AND KILLIAN
            PARKWAY IN WEST KENDALL. VERY SMALL BRANCHES
            AND LEAVES WERE SCATTERED ACROSS THE GENERAL
            AREA FROM STRONG WINDS ASSOCIATED WITH THE
            STORM.

&&

RM

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 8:00 PM EDTSpecial Weather StatementMFLMiami-Dade60 min
Aug 3, 8:11 PM EDTSpecial Weather StatementMFLMiami-Dade49 min
Aug 3, 8:16 PM EDTAreal Flood AdvisoryMFLMiami-Dade119 min
Aug 3, 8:27 PM EDTAreal Flood AdvisoryMFLMiami-Dade2 hr
Aug 3, 9:29 PM EDTSpecial Weather StatementMFLMiami-Dade61 min
Aug 4, 7:49 AM EDTAreal Flood AdvisoryMFLCollier2 hr
Aug 4, 8:44 AM EDTAreal Flood AdvisoryMFLCollier2 hr
Aug 4, 11:53 AM EDTSpecial Marine WarningMFL67 min
Aug 4, 12:02 PM EDTSpecial Weather StatementMFLBroward43 min
Aug 4, 12:40 PM EDTSpecial Weather StatementMFLBroward35 min
Aug 4, 12:58 PM EDTSpecial Marine WarningMFL62 min
Aug 4, 1:11 PM EDTAreal Flood AdvisoryMFLBroward, Miami-Dade2 hr
Aug 4, 1:11 PM EDTSpecial Weather StatementMFLBroward64 min
Aug 4, 1:25 PM EDTAreal Flood AdvisoryMFLBroward, Palm Beach2 hr
Aug 4, 3:18 PM EDTAreal Flood AdvisoryMFLMiami-Dade117 min

Nearby

Areal Flood Advisories in Florida, 2021Every 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.