Alert archive / Florida / Special Weather Statements in 2015

Special Weather Statement, NWS Miami, FL

April 20, 2015Palm Beach County, Florida

NWS Miami, FL issued this special weather statement at Apr 20, 2015, 4:53 PM EDT for Palm Beach County, Florida. It was in force for 22 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: Apr 20, 2015, 4:53 PM EDT (20:53 UTC)
Expired: Apr 20, 2015, 5:15 PM EDT
In force: 22 min
Issued by: NWS Miami, FL

County Palm Beach County, FL

The radar

The Miami radar (KAMX), 112 km from the middle of the area, began a volume at 20:54 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, 8.9 hours before the alert went out and 216 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: 841 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 1041 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 Apr 20, 3:53 PM EDT, 1 hour earlier.

Area forecast discussion, Apr 20, 3:53 PM EDT, 1 hour before

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Hazardous weather outlook, Apr 20, 12:40 PM EDT, 4 hours 13 minutes before

HAZARDOUS WEATHER OUTLOOK FOR SOUTH FLORIDA
NATIONAL WEATHER SERVICE MIAMI FL
1240 PM EDT MON APR 20 2015

AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676-
210445-
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 EXTENDING FROM
20 NM TO 60 NM-
WATERS FROM DEERFIELD BEACH TO OCEAN REEF, FL EXTENDING FROM 20 NM
TO THE TERRITORIAL WATERS OF THE 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-
GULF WATERS FROM CHOKOLOSKEE TO BONITA BEACH, FL EXTENDING FROM
20 TO 60 NM-
1240 PM EDT MON APR 20 2015

...STRONG TO SEVERE THUNDERSTORMS POSSIBLE THIS AFTERNOON/EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH FLORIDA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THUNDERSTORMS: STORMS WILL BE MOST NUMEROUS IN THE LAKE REGION
AND PALM BEACH COUNTY. HOWEVER, THEY ARE POSSIBLE ACROSS SOUTH
FLORIDA. THE PRIMARY IMPACTS WILL BE CLOUD TO GROUND LIGHTNING
STRIKES, STRONG GUSTY WINDS, LOCALLY HEAVY RAINFALL, AND LARGE
HAIL.

WIND: A FEW STORMS WILL BE CAPABLE OF PRODUCING SEVERE WIND GUSTS
UP TO 65 MPH.

HAIL: LARGE HAIL UP TO ONE INCH...OR QUARTER SIZED HAIL...WILL BE
POSSIBLE WITH ANY OF THE STORMS ACROSS THE LAKE REGION AND EAST
COAST. ELSEWHERE....SMALL HAIL IS POSSIBLE IN STORMS.

FLOODING: HEAVY RAINFALL FROM THUNDERSTORMS COULD LEAD TO PONDING
OF WATER ALONG ROADWAYS AND IN POOR DRAINAGE AREAS.

TORNADOES: ISOLATED TORNADOES ARE POSSIBLE ACROSS THE EAST COAST
METRO AREAS THIS AFTERNOON.

WATERSPOUTS: THERE IS A SLIGHT CHANCE OF WATERSPOUTS ALL SOUTH
FLORIDA WATERS TODAY.

VISIBILITY: A LARGE BRUSH FIRE IN WESTERN METRO MIAMI-DADE COUNTY
WILL LEAD TO REDUCED VISIBILITY DUE TO SMOKE OVER SOME OF THE
WESTERN SUBURBS OF MIAMI-DADE AND BROWARD COUNTIES.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THUNDERSTORM CHANCES WILL REMAIN RATHER HIGH THROUGH MUCH OF THE
WEEK AND COVER MOST OF SOUTH FLORIDA. POTENTIAL THREATS FROM THESE
STORMS WILL BE OCCASIONAL LIGHTNING, GUSTY WINDS, SMALL HAIL AND
HEAVY RAIN LEADING TO THE POTENTIAL FOR LOCALIZED FLOODING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED SHORTLY. 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.

In the hours before

Special weather statement, Apr 20, 3:59 PM EDT, 54 minutes before

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Special weather statement, Apr 20, 4:13 PM EDT, 40 minutes before

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Special weather statement, Apr 20, 4:31 PM EDT, 22 minutes before

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Local storm report, Apr 20, 4:34 PM EDT, 19 minutes before

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Local storm report, Apr 20, 4:38 PM EDT, 15 minutes before

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Special weather statement, Apr 20, 4:53 PM EDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 1:08 PM EDT	Special Weather Statement	MFL	Broward	22 min
Apr 20, 1:30 PM EDT	Special Weather Statement	MFL	Broward	45 min
Apr 20, 1:33 PM EDT	Tornado Warning	MFL	Miami-Dade	27 min
Apr 20, 2:01 PM EDT	Special Marine Warning	MFL		29 min
Apr 20, 2:05 PM EDT	Special Weather Statement	MFL	Glades	25 min
Apr 20, 2:15 PM EDT	Special Weather Statement	MFL	Palm Beach	45 min
Apr 20, 2:54 PM EDT	Special Weather Statement	MFL	Palm Beach	36 min
Apr 20, 3:11 PM EDT	Special Weather Statement	MFL	Palm Beach	49 min
Apr 20, 3:15 PM EDT	Special Marine Warning	MFL		60 min
Apr 20, 3:59 PM EDT	Special Weather Statement	MFL	Martin	31 min
Apr 20, 4:13 PM EDT	Special Weather Statement	MFL	Palm Beach	47 min
Apr 20, 4:16 PM EDT	Special Marine Warning	MFL		59 min
Apr 20, 5:10 PM EDT	Special Marine Warning	MFL		65 min
Apr 20, 5:19 PM EDT	Special Weather Statement	MFL	Broward	41 min
Apr 20, 5:49 PM EDT	Special Marine Warning	MFL		26 min
Apr 20, 6:22 PM EDT	Special Marine Warning	MFL		23 min

Nearby

Special Weather Statements in Florida, 2015 Every special weather statement in 2015

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.