Alert archive / Florida / Special Weather Statements in 2015

Special Weather Statement, NWS Miami, FL

April 20, 2015Broward County, Florida

NWS Miami, FL issued this special weather statement at Apr 20, 2015, 1:30 PM EDT for Broward County, Florida. It was in force for 45 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, 1:30 PM EDT (17:30 UTC)
Expired: Apr 20, 2015, 2:15 PM EDT
In force: 45 min
Issued by: NWS Miami, FL

County Broward County, FL

The radar

The Miami radar (KAMX), 41 km from the middle of the area, began a volume at 17:29 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, 5.5 hours before the alert went out and 287 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, 10:16 AM EDT, 3 hours 14 minutes earlier.

Area forecast discussion, Apr 20, 10:16 AM EDT, 3 hours 14 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE MIAMI FL
1016 AM EDT MON APR 20 2015

.UPDATE...
A COLD FRONT WAS LOCATED OVER THE SOUTHEASTERN UNITED STATES THIS
MORNING. THE FRONT WILL CONTINUE TO MOVE SOUTHWARD INTO NORTH
FLORIDA THIS AFTERNOON. THIS WILL ALLOW FOR THE STEERING FLOW OVER
SOUTH FLORIDA TO SWING FROM A SOUTHERLY DIRECTION THIS MORNING TO
A SOUTHWEST DIRECTION THIS AFTERNOON KEEPING TO DEEPER TROPICAL
AIRMASS IN PLACE OVER SOUTH FLORIDA. THEREFORE...SCATTERED TO
NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER
MOST OF SOUTH FLORIDA THIS AFTERNOON WITH THE BEST COVERAGE OVER
PALM BEACH COUNTY. THE ONLY EXCEPTION TO THIS IS OVER THE NAPLES
AREA WHERE IT SHOULD BE MORE ISOLATED TO SCATTERED IN COVERAGE.

A MID TO UPPER LEVEL JET OF 50 TO 10O KNOTS WILL ALSO BE MOVING
THROUGH CENTRAL/NORTHERN FLORIDA THIS AFTERNOON. THIS WILL ALLOW
FOR THE 500 MB TEMP TO COOL DOWN TO AROUND -9C THIS AFTERNOON.
THEREFORE...SOME OF THE STORMS COULD BECOME STRONG OVER SOUTH
FLORIDA THIS AFTERNOON INTO THIS EVENING WITH GUSTY WINDS, HAIL,
FREQUENT LIGHTNING STRIKES, AND HEAVY RAINFALL. THEREFORE...THE
STRONG STORM WORDING WILL CONTINUE IN THE HWO PACKAGE FOR SOUTH
FLORIDA FOR TODAY.

REST OF THE FORECAST LOOKS GOOD AT THIS TIME AND NO OTHER CHANGES
ARE PLANNED.

&&
.UPDATE...54/BNB

.PREV DISCUSSION... /ISSUED 754 AM EDT MON APR 20 2015/

AVIATION...
GENERAL INSTABILITY OVER SOUTH FLORIDA WILL ALLOW SHOWERS AND
THUNDERSTORMS TO DEVELOP BEGINNING LATER THIS MORNING. SHORT RANGE
MODELS INDICATE THE MIA AREA MAY SEE EARLIER SHOWER AND
THUNDERSTORM ACTIVITY IN A MORE SOUTHEAST FLOW PATTERN. THEN THE
FLOW BEGINS TO TURN SOUTHWEST, ALLOWING FOR THE CONVECTION TO PICK
UP MORE TO THE NORTH AND BRING MID DAY SHOWERS AND THUNDERSTORMS
TO AREAS FROM FLL NORTH. KAPF IS THE MOST UNCERTAIN AS THE
SOUTHWEST FLOW MAY PUSH ALL THE ACTIVITY INLAND, AWAY FROM THE
SITE. HAVE MENTION OF SHRA, VCTS, AND EVEN TEMPO GROUPS FOR MANY
OF THE SOUTHEAST FLORIDA TAF SITES. CONVECTION SHOULD COME TO AN
END IN THE EVENING HOURS.

&&

PREV DISCUSSION... /ISSUED 356 AM EDT MON APR 20 2015/

DISCUSSION...
A MUCH MORE MOIST...SUMMER-LIKE PATTERN WILL COMMENCE TODAY ACROSS
SOUTH FLORIDA AND PREVAIL THROUGH MUCH OF THE WEEK. DEEP SOUTHWEST
FLOW WILL CONTINUE TO PUMP MOISTURE INTO THE AREA THROUGH THE
MORNING AND INTO THIS AFTERNOON. PWATS ARE EXPECTED TO SURGE TO
AROUND 1.75 INCHES ACROSS MOST OF THE AREA BY THE AFTERNOON HOURS.
THIS COMBINED WITH A MID LEVEL TROUGH AXIS SWINGING ACROSS THE
FLORIDA PENINSULA WILL PRODUCE SCATTERED TO NUMEROUS SHOWERS AND
THUNDERSTORMS ACROSS THE AREA WITH THE HIGHEST CONCENTRATION AROUND
THE LAKE OKEECHOBEE AND PALM BEACH COUNTY AREAS. BELIEVE CONVECTIVE
INTENSITY MAY STILL BE INHIBITED SOMEWHAT DUE TO THE DEEPER MOISTURE
PROFILE EXPECTED. STILL HOWEVER CANNOT RULE OUT A FEW ISOLATED
STRONG THUNDERSTORMS WITH GUSTY WINDS AND HEAVY DOWNPOURS.

COVERAGE OF SHOWERS AND THUNDERSTORMS SHOULD DECREASE SLIGHTLY
OVERNIGHT AND INTO TUESDAY. THIS REPRIEVE WILL BE SHORT LIVED
HOWEVER AS A COLD FRONT IS STILL EXPECTED TO PUSH INTO THE LAKE
OKEECHOBEE REGION TUESDAY AFTERNOON AND EVENING BEFORE STALLING.
THIS WILL KEEP FAIRLY UNIFORM CHANCES FOR SHOWERS AND THUNDERSTORMS
TUESDAY AFTERNOON AND EVENING.

THE FRONT IS THEN EXPECTED TO PUSH BACK TO THE NORTH AS A WARM FRONT
ON WEDNESDAY AS SURFACE HIGH PRESSURE BEHIND THE FRONT SLIDES TO THE
EAST AND INTO THE WESTERN ATLANTIC. AS IT DOES...A REINFORCING SHOT
OF DEEP MOISTURE WILL PUSH INTO SOUTH FLORIDA AROUND THE NORTHERN
PERIPHERY OF MID LEVEL RIDGING ACROSS WESTERN CUBA. POINT SOUNDINGS
ACROSS THE AREA DEPICT A NEARLY SATURATED PROFILE WEDNESDAY
AFTERNOON AND EVENING WITH PWATS SURGING TO NEAR 2 INCHES WHICH IS
OVER +2 STANDARD DEVIATIONS. NEEDLESS TO SAY THIS WILL RESULT IN
EXTENSIVE COVERAGE OF SHOWERS AND THUNDERSTORMS WEDNESDAY AFTERNOON
AND EARLY EVENING. HOWEVER WITH THE MOSTLY SATURATED
PROFILE...BELIEVE MORE ROBUST CONVECTION SHOULD BE RATHER LIMITED.

THURSDAY THROUGH SATURDAY...MID LEVEL RIDGING ACROSS THE YUCATAN
PENINSULA IS EXPECTED TO BUILD NORTHWARD AND INTO THE WESTERN GULF
OF MEXICO AND THE FLORIDA PENINSULA. THIS WILL DECREASE AFTERNOON
CONVECTIVE COVERAGE EACH DAY. RIDGING SHOULD THEN BECOME FIRMLY
ENTRENCHED BY SATURDAY WITH THE 590 DM ISOHYPSE REACHING THE
NORTHERN KEYS. THIS SHOULD TRANSLATE INTO HOT AND NEARLY RAIN FREE
CONDITIONS FOR SATURDAY.

LONG RANGE MODELS KEEP FAIRLY STRONG RIDGING SOUTH OF THE AREA
SUNDAY AND INTO NEXT MONDAY. MODELS ALSO HINT AT ANOTHER WEAK COLD
FRONT APPROACHING SOUTH FLORIDA SUNDAY NIGHT WITH RAIN CHANCES
RETURNING.

AVIATION...
UPPER DISTURBANCE CROSSING THE LAKE REGION LATE TODAY, OUT AHEAD
OF UPPER JET AND COLD FRONT ENTERING THE GULF COAST, WILL PRODUCE
MORE NUMEROUS SHOWERS/STORMS ACROSS NORTHERN TERMINALS. IN THE
NEAR TERM, HRRR/GFS SHOWING SHOWERS DEVELOPING THROUGH THE FLORIDA
STRAITS POSSIBLY AFFECTING KMIA INTO DAWN. SOME BRIEF MVFR CIGS
ARE ALSO POSSIBLE INTO THE EARLY MORNING HOURS KFXE/KFLL. SMOKE
FROM WILDFIRE WEST OF MIA MAY LEAD TO SOME LOWER VIS OR LOW SMOKE
LAYERS INTO DAWN.

MARINE...
WINDS SHOULD GENERALLY REMAIN SOUTH TO SOUTHWEST THROUGH THE DAY
ACROSS THE AREA WATERS AT 10 TO 15 KNOTS. SEAS SHOULD REMAIN IN
THE 1 TO 3 FOOT RANGE ACROSS THE ATLANTIC WATERS WITH 1 TO 2 FEET
FOR THE GULF WATERS. GOOD COVERAGE OF SHOWERS AND THUNDERSTORMS
ARE EXPECTED FOR THE AREA WATERS THROUGH MIDWEEK WITH ASSOCIATED
LOCALLY HIGHER WINDS AND SEAS EXPECTED.

&&

.PRELIMINARY POINT TEMPS/POPS...
WEST PALM BEACH  88  70  86  70 /  80  40  70  40
FORT LAUDERDALE  90  73  88  73 /  60  30  70  60
MIAMI            91  74  88  73 /  50  20  70  60
NAPLES           88  72  88  70 /  30  30  50  40

&&

.MFL WATCHES/WARNINGS/ADVISORIES...
FL...NONE.
AM...NONE.
GM...NONE.
&&

SHORT TERM...54/BNB
LONG TERM....10/CD

Hazardous weather outlook, Apr 20, 12:40 PM EDT, 50 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, 1:08 PM EDT, 22 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
108 PM EDT MON APR 20 2015

FLZ072>074-172-173-201730-
COASTAL MIAMI DADE COUNTY FL-METROPOLITAN MIAMI DADE FL-INLAND MIAMI-
DADE COUNTY FL-METRO BROWARD COUNTY FL-COASTAL BROWARD COUNTY FL-
108 PM EDT MON APR 20 2015

...SIGNIFICANT WEATHER ADVISORY FOR UP TO NICKEL SIZED HAIL FOR
SOUTHEASTERN BROWARD AND NORTHEASTERN MIAMI-DADE COUNTIES UNTIL 130
PM EDT...

* AT 107 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
  OVER MIAMI LAKES...OR OVER HIALEAH...MOVING NORTHEAST AT 25 MPH.

* THE PRIMARY IMPACTS WILL BE UP TO NICKEL SIZED HAIL. SEEK SHELTER
  IN A SAFE BUILDING UNTIL THE STORM PASSES.

* LOCATIONS IMPACTED INCLUDE...
  MIAMI...HIALEAH...FORT LAUDERDALE...PEMBROKE PINES...HOLLYWOOD...
  MIRAMAR...DAVIE...MIAMI BEACH...SURFSIDE...MIAMI GARDENS...
  HALLANDALE...NORTH MIAMI...DORAL...NORTH MIAMI BEACH...AVENTURA...
  DANIA BEACH...MIAMI LAKES...COOPER CITY...HIALEAH GARDENS AND SUNNY
  ISLES BEACH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS ACTIVITY WAS ALSO DEVELOPING IN AN ENVIRONMENT FAVORABLE FOR THE
FORMATION OF FUNNEL CLOUDS. STAY TUNED TO NOAA WEATHER RADIO AND
LOCAL MEDIA FOR ADDITIONAL UPDATES AND POSSIBLE WARNINGS.

&&

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT FOR
SOUTHEASTERN FLORIDA.

LAT...LON 2609 8011 2611 8012 2592 8013 2591 8014
      2591 8011 2586 8012 2585 8014 2588 8016
      2586 8018 2584 8015 2584 8016 2577 8031
      2591 8043 2615 8013 2611 8011 2612 8011
      2612 8010
TIME...MOT...LOC 1707Z 235DEG 22KT 2589 8031

SI

Special weather statement, Apr 20, 1:30 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
130 PM EDT MON APR 20 2015

FLZ072>074-172-173-201815-
COASTAL MIAMI DADE COUNTY FL-METROPOLITAN MIAMI DADE FL-INLAND MIAMI-
DADE COUNTY FL-METRO BROWARD COUNTY FL-COASTAL BROWARD COUNTY FL-
130 PM EDT MON APR 20 2015

...SIGNIFICANT WEATHER ADVISORY FOR THE DEVELOPMENT OF FUNNEL CLOUDS
AND UP TO NICKEL SIZED HAIL FOR SOUTHEASTERN BROWARD AND NORTHEASTERN
MIAMI-DADE COUNTIES UNTIL 215 PM EDT...

* AT 130 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
  WITH ROTATION...CAPABLE OF PRODUCING A FUNNEL CLOUD OVER
  OPA-LOCKA...OR OVER HIALEAH...MOVING NORTHEAST AT 10 MPH.

* IN ADDITION...UP TO NICKEL SIZED HAIL IS POSSIBLE. SEEK SHELTER IN
  A SAFE BUILDING UNTIL THE STORM PASSES.

* LOCATIONS IMPACTED INCLUDE...
  MIAMI...HIALEAH...FORT LAUDERDALE...PEMBROKE PINES...HOLLYWOOD...
  MIRAMAR...DAVIE...MIAMI BEACH...SURFSIDE...MIAMI GARDENS...
  HALLANDALE...NORTH MIAMI...DORAL...NORTH MIAMI BEACH...AVENTURA...
  DANIA BEACH...MIAMI LAKES...HIALEAH GARDENS...SUNNY ISLES BEACH AND
  OPA-LOCKA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO STREET FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

THIS ACTIVITY WAS ALSO DEVELOPING IN AN ENVIRONMENT FAVORABLE FOR THE
FORMATION OF FUNNEL CLOUDS. STAY TUNED TO NOAA WEATHER RADIO AND
LOCAL MEDIA FOR ADDITIONAL UPDATES AND POSSIBLE WARNINGS.

&&

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT FOR
SOUTHEASTERN FLORIDA.

LAT...LON 2590 8012 2584 8012 2585 8018 2581 8019
      2577 8028 2583 8035 2592 8039 2613 8015
      2608 8011 2591 8012 2593 8012 2593 8013
      2590 8013 2591 8014 2589 8013
TIME...MOT...LOC 1730Z 236DEG 10KT 2589 8028

SI

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, 1:33 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, 4:53 PM EDT	Special Weather Statement	MFL	Palm Beach	22 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.