Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Melbourne, FL

May 11, 2021Martin County, Florida

NWS Melbourne, FL issued this special weather statement at May 11, 2021, 3:58 PM EDT for Martin County, Florida. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 11, 2021, 3:58 PM EDT (19:58 UTC)
Expired
May 11, 2021, 4:45 PM EDT
In force
47 min
Issued by
NWS Melbourne, FL

County Martin County, FL

The radar

The Melbourne radar (KMLB), 120 km from the middle of the area, began a volume at 19:58 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, 8.0 hours before the alert went out and 138 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 2021-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 972 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 2021-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -13 square meters per square second.193958Sfc1 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
972 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
857 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
-13 m²/s²
0-3 km storm-relative helicity
-4 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at May 11, 10:09 AM EDT, 5 hours 49 minutes earlier.

Area forecast discussion, May 11, 10:09 AM EDT, 5 hours 49 minutes before
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  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
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  <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.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Hazardous weather outlook, May 11, 11:14 AM EDT, 4 hours 44 minutes before
Hazardous Weather Outlook
National Weather Service Melbourne FL
1114 AM EDT Tue May 11 2021

AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141-
144-147-112100-
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-
1114 AM EDT Tue May 11 2021

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

.THUNDERSTORM IMPACT...
Isolated to scattered thunderstorms are possible this afternoon
and through this evening before diminishing by around midnight.
Any storms that develop will have the potential of producing gusty
winds, heavy rainfall, and frequent lighting strikes.

.RIP CURRENT IMPACT...
There is a moderate risk of rip currents at all Central Florida
Atlantic beaches. Always swim within sight of a life guard and
never enter the surf alone.

.MARINE THUNDERSTORM GUST IMPACT...
Isolated showers and storms will be possible this afternoon which
have the potential to produce winds to around 30kts over the
nearshore waters through midnight.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.
Rain and storm chances will increase through the week with the
best chance for thunderstorms expected on Wednesday and into
Thursday. The main threats will once again be cloud-to-ground
lightning, gusty winds, and heavy rainfall.

Large northeast swells will produce a high risk of rip currents
and rough surf at area beaches as well as hazardous boating
conditions starting Thursday night and continuing through the
weekend.

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

Rodriguez/Pendergrast

In the hours before

Special weather statement, May 11, 3:58 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Melbourne FL
358 PM EDT Tue May 11 2021

FLZ064-112045-
Martin FL-
358 PM EDT Tue May 11 2021

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL MARTIN COUNTY UNTIL 445
PM EDT...

At 357 PM EDT, Doppler radar was tracking a strong thunderstorm 7
miles southwest of Palm City. This storm was nearly stationary.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Highways 76 and 726 between Indiantown and Palm City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 2699 8043 2717 8046 2717 8028 2699 8024
TIME...MOT...LOC 1957Z 310DEG 3KT 2709 8037

Watson

The office that day

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

IssuedProductOfficeCountiesLasted
May 11, 4:23 PM EDTSpecial Weather StatementMLBFlagler52 min
May 11, 4:47 PM EDTSpecial Weather StatementMLBMartin28 min
May 11, 4:53 PM EDTSpecial Weather StatementMLBSeminole52 min
May 11, 4:57 PM EDTSpecial Marine WarningMLB63 min
May 11, 5:18 PM EDTSpecial Weather StatementMLBSeminole27 min
May 11, 5:44 PM EDTSpecial Weather StatementMLBBrevard46 min
May 11, 5:53 PM EDTSpecial Marine WarningMLB46 min
May 11, 6:59 PM EDTSpecial Weather StatementMLBBrevard46 min

Nearby

Special Weather Statements in Florida, 2021Every special weather statement 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.