Alert archive / Florida / Special Weather Statements in 2017

Special Weather Statement, NWS Miami, FL

July 20, 2017Palm Beach County, Florida

NWS Miami, FL issued this special weather statement at Jul 20, 2017, 3:22 PM EDT for Palm Beach County, Florida. It was in force for 53 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
Jul 20, 2017, 3:22 PM EDT (19:22 UTC)
Expired
Jul 20, 2017, 4:15 PM EDT
In force
53 min
Issued by
NWS Miami, FL

County Palm Beach County, FL

The radar

The Miami radar (KAMX), 113 km from the middle of the area, began a volume at 19:26 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, 7.4 hours before the alert went out and 89 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 2017-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 886 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 2017-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 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
886 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
1005 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
2 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 Miami, FL wrote its last area forecast discussion before this special weather statement went out at Jul 20, 1:29 PM EDT, 1 hour 53 minutes earlier.

Area forecast discussion, Jul 20, 1:29 PM EDT, 1 hour 53 minutes before
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  <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.
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      <p id="message2">
        Please try again in a few minutes.
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Hazardous weather outlook, Jul 20, 10:04 AM EDT, 5 hours 18 minutes before
Hazardous Weather Outlook for South Florida...UPDATED
National Weather Service Miami FL
1004 AM EDT Thu Jul 20 2017

AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676-
210015-
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-
1004 AM EDT Thu Jul 20 2017

...SCATTERED TO NUMEROUS THUNDERSTORMS THROUGH EARLY EVENING...
...LOCALIZED FLOODING POSSIBLE...
...WATERSPOUTS POSSIBLE OVER LOCAL WATERS...

This hazardous weather outlook is for South Florida.

.DAY ONE...TODAY AND TONIGHT

Thunderstorms: Scattered to numerous thunderstorms will affect most
of South Florida and the adjacent waters through early evening. While
most of the storms will be concentrated over the Everglades this
afternoon, showers and thunderstorms will also affect the metro
areas of the Atlantic and Gulf coasts through at least mid-afternoon.
The primary threats will be lightning, heavy rainfall, and gusty
wind.

Waterspouts: Waterspouts are possible over all the local waters
today, primarily through the early afternoon hours.

Flooding: Locally heavy rainfall may lead to localized flooding in
areas of slow moving thunderstorms. The primary impact will be
significant ponding of water on roadways.

Wind: Gusts of 40 mph or greater are possible with the stronger
storms today.

Temperatures: Heat index values of 100 to 105 degrees are forecast
across South Florida with areas along the west coast reaching heat
index values between 105 to 107 this afternoon.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

Scattered to numerous thunderstorms are possible each day, with the
greatest coverage shifting this weekend to interior and Gulf Coast
in the afternoons and evenings. Frequent lightning, gusty winds, and
torrential rainfall will be the primary hazards.

.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, Jul 20, 11:48 AM EDT, 3 hours 34 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MIAMI FL
1148 AM EDT THU JUL 20 2017

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

1037 AM     WATER SPOUT      1 NE BAL HARBOUR        25.95N  80.11W
07/20/2017                   AMZ651             FL   SOCIAL MEDIA

            A PHOTO OF A WATER SPOUT LOCATED OFFSHORE SUNNY ISLES
            BEACH WAS REPORTED BY A MEMBER OF THE PUBLIC VIA
            TWITTER.

&&

EVENT NUMBER MFL1700278

KELLY
Special weather statement, Jul 20, 12:05 PM EDT, 3 hours 17 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Miami FL
1205 PM EDT THU JUL 20 2017

FLZ072-074-172-173-201645-
Coastal Broward County FL-Metro Broward County FL-
Metropolitan Miami Dade FL-Coastal Miami Dade County FL-
1205 PM EDT THU JUL 20 2017

...Significant Weather Advisory for frequent to excessive lightning
and 45 to 55 mph winds for northeastern Miami-Dade and southeastern
Broward Counties Until 1245 PM EDT...

* At 1205 PM EDT...The public reported a strong thunderstorm over
  Pinewood, or near Miami Gardens, moving northeast at 10 mph.

* The primary impacts will be frequent to excessive lightning and
  gusty winds  of 45 TO 55 mph.  Lightning is the number one weather
  related killer in Florida. Trees and open shelters offer no
  protection. These winds can down small tree limbs and branches, and
  blow around unsecured small objects. Seek shelter in a safe
  building until the storm passes.

* LOCATIONS IMPACTED INCLUDE...
  Miami, Hialeah, Pembroke Pines, Hollywood, Miramar, Davie,
  Plantation, Miami Gardens, Hallandale, North Miami, North Miami
  Beach, Aventura, Miami Lakes, Cooper City, Hialeah Gardens,
  Opa-Locka, West Park, Miami Shores, El Portal and Medley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For additional information visit the Miami National Weather Service
website at www.weather.gov/miami. For information in Spanish, visit
our website at www.weather.gov/miami/espanol.

&&

LAT...LON 2582 8018 2587 8035 2611 8023 2596 8014
TIME...MOT...LOC 1605Z 214DEG 11KT 2589 8022

MOLLEDA
Special weather statement, Jul 20, 3:22 PM EDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Miami FL
322 PM EDT THU JUL 20 2017

FLZ067-068-202015-
Inland Palm Beach County FL-Metro Palm Beach County FL-
322 PM EDT THU JUL 20 2017

...Significant Weather Advisory for frequent to excessive lightning
and 45 to 55 mph winds for northeastern Palm Beach County Until 415
PM EDT...

* At 322 PM EDT...Doppler radar was tracking a strong thunderstorm
  near Lion Country Safari Park, or 7 miles southwest of Wellington,
  moving northeast at 10 mph.

* The primary impacts will be frequent to excessive lightning and
  gusty winds  of 45 TO 55 mph.  Lightning is the number one weather
  related killer in Florida. Trees and open shelters offer no
  protection. These winds can down small tree limbs and branches, and
  blow around unsecured small objects. Seek shelter in a safe
  building until the storm passes.

* LOCATIONS IMPACTED INCLUDE...
  West Palm Beach, Wellington, Greenacres, Royal Palm Beach, Palm
  Springs, Royal Palm Estates, Lake Belvedere Estates, Golden Lakes,
  Loxahatchee Groves, Lion Country Safari Park, The Acreage,
  Loxahatchee Nwr and Florida Gardens.

LAT...LON 2650 8033 2662 8048 2684 8031 2665 8009
TIME...MOT...LOC 1922Z 224DEG 7KT 2662 8035

JT

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 20, 8:06 AM EDTSpecial Marine WarningMFL39 min
Jul 20, 12:05 PM EDTSpecial Weather StatementMFLBroward40 min
Jul 20, 3:43 PM EDTSpecial Weather StatementMFLMartin47 min
Jul 20, 4:26 PM EDTSpecial Weather StatementMFLBroward49 min
Jul 20, 4:33 PM EDTSpecial Weather StatementMFLPalm Beach42 min

Nearby

Special Weather Statements in Florida, 2017Every special weather statement in 2017

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.