Alert archive / Florida / Special Weather Statements in 2018

Special Weather Statement, NWS Miami, FL

August 9, 2018Palm Beach County, Florida

NWS Miami, FL issued this special weather statement at Aug 9, 2018, 9:24 PM EDT for Palm Beach County, Florida. It was in force for 51 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
Aug 9, 2018, 9:24 PM EDT (01:24 UTC)
Expired
Aug 9, 2018, 10:15 PM EDT
In force
51 min
Issued by
NWS Miami, FL

County Palm Beach County, FL

The radar

The Miami radar (KAMX), 138 km from the middle of the area, began a volume at 01:24 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 00:00Z, 1.4 hours before the alert went out and 117 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 00:00Z on 2018-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 974 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 00:00Z on 2018-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 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
974 J/kg
Mixed-layer CIN
-104 J/kg
Mixed-layer LCL
1305 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
79 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 Aug 9, 7:52 PM EDT, 1 hour 32 minutes earlier.

Area forecast discussion, Aug 9, 7:52 PM EDT, 1 hour 32 minutes before
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Hazardous weather outlook, Aug 9, 5:25 PM EDT, 3 hours 59 minutes before
Hazardous Weather Outlook for South Florida...UPDATED
National Weather Service Miami FL
525 PM EDT Thu Aug 9 2018

AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676-
100930-
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-
525 PM EDT Thu Aug 9 2018

...STRONG THUNDERSTORMS POSSIBLE THIS AFTERNOON AND EVENING...

This hazardous weather outlook is for South Florida.

.DAY ONE...TONIGHT

Thunderstorms: There is a chance of thunderstorms this afternoon and
evening. Cloud-to-ground lightning and gusty winds are the primary
threats.

Waterspouts: Thunderstorms could produce waterspouts this afternoon
and evening.

Wind: Wind gusts in the strongest storms this afternoon in the
interior and portions of the east coast metro could exceed 40 mph.

Hail: Strong thunderstorms could produce hail up to the size of
nickels this afternoon and evening.

Flooding: Heavy rainfall from slow-moving thunderstorms could
produce the ponding of water over urbanized portions of the east
coast metro area this afternoon and evening.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

There is a chance of mainly afternoon thunderstorms through the
period, especially over interior South Florida. The best chances for
thunderstorms will be Saturday through Monday. Lightning is the
primary threat.

.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.

RAG

In the hours before

Special weather statement, Aug 9, 6:12 PM EDT, 3 hours 12 minutes before
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Local storm report, Aug 9, 6:22 PM EDT, 3 hours 2 minutes before
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Special weather statement, Aug 9, 7:29 PM EDT, 1 hour 55 minutes before
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Special weather statement, Aug 9, 8:48 PM EDT, 36 minutes before
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Local storm report, Aug 9, 9:19 PM EDT, 5 minutes before
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Special weather statement, Aug 9, 9:24 PM EDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 8:12 PM EDTSpecial Marine WarningMFL33 min
Aug 9, 8:44 PM EDTSpecial Marine WarningMFL31 min
Aug 9, 8:48 PM EDTSpecial Weather StatementMFLPalm Beach42 min
Aug 9, 8:54 PM EDTSevere Thunderstorm WarningMFLPalm Beach36 min
Aug 9, 9:11 PM EDTSpecial Marine WarningMFL34 min
Aug 9, 9:54 PM EDTSpecial Weather StatementMFLPalm Beach51 min
Aug 10, 3:28 PM EDTSpecial Weather StatementMFLCollier47 min
Aug 10, 3:39 PM EDTSpecial Weather StatementMFLMiami-Dade51 min
Aug 10, 3:46 PM EDTSpecial Weather StatementMFLPalm Beach44 min
Aug 10, 3:56 PM EDTSpecial Marine WarningMFL34 min
Aug 10, 4:05 PM EDTSpecial Weather StatementMFLMartin40 min
Aug 10, 4:26 PM EDTSpecial Weather StatementMFLCollier49 min
Aug 10, 4:33 PM EDTSpecial Marine WarningMFL27 min
Aug 10, 4:41 PM EDTSpecial Weather StatementMFLBroward, Palm Beach79 min
Aug 10, 4:55 PM EDTSpecial Marine WarningMFL95 min
Aug 10, 5:35 PM EDTSevere Thunderstorm WarningMFLMiami-Dade25 min
Aug 10, 5:38 PM EDTSpecial Marine WarningMFL37 min
Aug 10, 5:57 PM EDTSpecial Weather StatementMFLMiami-Dade48 min
Aug 10, 6:15 PM EDTSpecial Marine WarningMFL90 min
Aug 10, 7:55 PM EDTSpecial Marine WarningMFL35 min

Nearby

Special Weather Statements in Florida, 2018Every special weather statement in 2018

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.