Alert archive / Florida / Special Weather Statements in 2012

Special Weather Statement, NWS Melbourne, FL

April 20, 20124 counties in Florida

NWS Melbourne, FL issued this special weather statement at Apr 20, 2012, 3:56 PM EDT for 4 counties in Florida. It was in force for 64 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, 2012, 3:56 PM EDT (19:56 UTC)
Expired: Apr 20, 2012, 5:00 PM EDT
In force: 64 min
Issued by: NWS Melbourne, FL

Counties Lake County, FL, Orange County, FL, Osceola County, FL, Seminole County, FL

The radar

The Melbourne radar (KMLB), 85 km from the middle of the area, began a volume at 20:00 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, 7.9 hours before the alert went out and 91 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: 414 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 861 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Melbourne, FL wrote its last area forecast discussion before this special weather statement went out at Apr 20, 10:25 AM EDT, 5 hours 31 minutes earlier.

Area forecast discussion, Apr 20, 10:25 AM EDT, 5 hours 31 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MELBOURNE FL
1025 AM EDT FRI APR 20 2012

.DISCUSSION...
MORNING RAOB SOUNDINGS SHOW PW VALUES INCREASING FROM 1.0" AT
KJAX...TO 1.2" AT KTBW/KXMR...TO 1.4" AT KMFL. ALL SOUNDINGS SHOW
THE MAJORITY OF THE MOISTURE CONCENTRATED BLO H70.  RUC80 ANALYSIS
SHOWS H100-H70 MEAN RH VALUES BTWN 70-75PCT OVER S FL...EMBEDDED
WITHIN A S/SWLY FLOW.

H100-H85 RIDGE AXIS DRAPED OVER THE NRN BAHAMAS/FL STRAITS WILL
GENERATE A STEADY W/SW BREEZE ACRS CENTRAL FL. VSBL SAT ANALYSIS
SHOWS THE WEST COAST SEA BREEZE IN THE PROCESS OF FORMING. SFC PGRAD
IS FAIRLY WEAK...SHOULD SEE THE EAST COAST SEA BREEZE DVLP BY MID
AFTN. ITS INLAND PROGRESS WILL BE LIMITED BY THE SWRLY ENVIRONMENTAL
FLOW...MAYBE JUST W OF I-95 BUT NOT MUCH FURTHER.

WEAK SUBSIDENCE INVERSIONS IN THE H80-H60 LYR WILL DELAY SHRA/TSRA
DVLPMNT...BUT THE WARM SWRLY SFC/BNDRY LYR FLOW SHOULD ALLOW TEMPS
TO REACH CONVECTIVE INITIATION BY MID AFTN. LITTLE IN THE WAY OF
MID/UPR LVL DYNAMIC LIFT ACRS CENTRAL FL TO SUPPORT SVR
CONVECTION...THOUGH SOME STORMS MAY BECOME STRONG DUE TO
SEABREEZE/TSTM OUTFLOW BOUNDARY INTERACTION. SCT POPS LOOK GOOD WITH
HIGHEST CHANCES S OF KMLB-KISM.

&&

.AVIATION...
THRU 20/16Z...LCL CIGS BTWN FL015-020. BTWN 20/16Z-20/18Z...VFR ALL
SITES CIGS LIFTG TO FL040-050. BTWN 20/18Z-21/00Z...CIGS BTWN
FL040-050...SCT MVFR SHRAS AND ISOLD IFR TSRAS. AFT 21/00Z...CIGS
LIFTG TO FL080-100...CHC MVFR SHRAS AND SLGT CHC IFR TSRAS.

&&

.MARINE...
SFC/LOW LVL RIDGE AXIS OVER THE NRN BAHAMAS/FL STRAITS WILL GENERATE
A GENTLE TO MODERATE S/SWRLY FLOW ACRS THE LCL ATLC THRU SUNSET.
DESPITE THE DVLPG OFFSHORE FLOW...BOATING CONDITIONS WILL BE
FAVORABLE THIS AFTN AS SEAS 3-4FT NEARSHORE AND 4-5FT OFFSHORE
CONSIST PRIMARILY OF A 3-4FT LONG PD SWELL.  CONDITIONS WILL BEGIN
TO DETERIORATE LATE TONIGHT AS A SFC LOW DVLPS OVER THE ERN GOMEX
AND TIGHTENS THE LCL PGRAD. MRNG FCST PACKAGE LOOKS GOOD...NO SIG
CHANGES NECESSARY.

&&

.MLB WATCHES/WARNINGS/ADVISORIES...
FL...NONE.
AM...NONE.

&&

SHORT TERM/AVIATION...BRAGAW
LONG TERM/IMPACT WX...BOWEN

Hazardous weather outlook, Apr 20, 12:38 PM EDT, 3 hours 18 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MELBOURNE FL
1238 PM EDT FRI APR 20 2012

AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141-
144-147-202300-
COASTAL WATERS FROM FLAGLER BEACH TO VOLUSIA BREVARD COUNTY LINE
OUT 20 NM-
COASTAL WATERS FROM VOLUSIA BREVARD COUNTY LINE TO SEBASTIAN
INLET OUT 20 NM-
COASTAL WATERS FROM SEBASTIAN INLET TO JUPITER INLET OUT 20 NM-
WATERS FROM FLAGLER BEACH TO VOLUSIA BREVARD COUNTY LINE 20 TO
60 NM OFFSHORE-
WATERS FROM VOLUSIA BREVARD COUNTY LINE TO SEBASTIAN INLET 20 TO
60 NM OFFSHORE-
WATERS FROM SEBASTIAN INLET TO JUPITER INLET 20 TO 60 NM OFFSHORE-
INLAND VOLUSIA-NORTHERN LAKE-ORANGE-SEMINOLE-SOUTHERN BREVARD-
OSCEOLA-INDIAN RIVER-OKEECHOBEE-ST. LUCIE-MARTIN-COASTAL VOLUSIA-
SOUTHERN LAKE-NORTHERN BREVARD-
1238 PM EDT FRI APR 20 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

.THUNDERSTORM IMPACT...
DAYTIME HEATING COUPLED WITH A MOIST SOUTHERLY WIND FLOW AND
AFTERNOON SEA AND LAKE BREEZES WILL LEAD TO SCATTERED LIGHTNING
STORMS ACROSS EAST CENTRAL FLORIDA AND THE ADJACENT NEAR SHORE
ATLANTIC WATERS...MAINLY DURING THE AFTERNOON AND EVENING. STORM
COVERAGE WILL BE HIGHEST BETWEEN ABOUT 3 PM AND 9 PM AS ACTIVITY
ALONG AND AHEAD OF THE WEST COAST SEA BREEZE MOVES NORTHEAST AT 15
TO 20 MPH AND INTERACTS WITH THE EAST COAST SEA BREEZE AND ANY
STORMS WHICH FORM ALONG IT.

TODAY'S STRONGER STORMS WILL BE CAPABLE OF PRODUCING STRONG GUSTY
WINDS ABOVE 40 MPH AND COIN SIZED HAIL. ANY FLORIDA THUNDERSTORM
CAN PRODUCE TORRENTIAL DOWNPOURS AND FREQUENT CLOUD TO GROUND
LIGHTNING.

.MARINE THUNDERSTORM GUST IMPACT...
WITH STORMS MOVING TOWARD THE NORTHEAST AT AROUND 15 KNOTS...
ANY STORM WHICH FORMS INLAND WILL MOVE ACROSS THE INTRACOASTAL
WATERWAY AND INTO THE NEAR SHORE ATLANTIC. WIND GUSTS OF 35 KNOTS
OR GREATER WILL BE POSSIBLE IN SOME OF THE STORMS. BOATERS SHOULD BE
ON THE LOOKOUT FOR STORMS APPROACHING FROM THE WEST AND SOUTHWEST.

.WATERSPOUT IMPACT...
WITH DEEP MOISTURE IN PLACE...ANY BOUNDARY COLLISIONS NEAR THE EAST
COAST COULD PRODUCE A WATERSPOUT THAT WOULD AFFECT THE INTRACOASTAL
AND NEAR SHORE ATLANTIC WATERS.

.RIP CURRENT IMPACT...
THE DEVELOPMENT OF A LONG PERIOD SWELL OF 3 FEET COUPLED WITH AN
APPROACHING NEW MOON TOMORROW WILL RESULT IN A HIGH RISK OF RIP
CURRENTS AT THE ATLANTIC BEACHES TODAY. THE THREAT WILL BE
GREATEST DURING THE OUTGOING TIDE FROM MID TO LATE MORNING.

.FIRE WEATHER IMPACT...
GIVEN THE PERSISTENT DRY CONDITIONS...A HIGH TO VERY HIGH FIRE
DANGER EXISTS ACROSS MOST OF EAST CENTRAL FLORIDA. WITH INCREASING
CHANCES FOR LIGHTNING STORMS WITH GUSTY WINDS IN THE FORECAST...
NEW IGNITIONS WILL BE POSSIBLE. ANY NEW OR SMOLDERING FIRES WILL BE
CAPABLE OF SPREADING QUICKLY.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.
A LOW PRESSURE CENTER WILL FORM OVER THE CENTRAL GULF OF MEXICO
EARLY SATURDAY AS A STRONG UPPER LEVEL DISTURBANCE DROPS UNUSUALLY
FAR SOUTH INTO THE GULF OF MEXICO. THIS LOW WILL TRACK EASTWARD
OVER FLORIDA BY SUNDAY MORNING. AS A RESULT...COVERAGE OF SHOWERS
AND STORMS WILL BE HIGH THIS WEEKEND...ESPECIALLY BETWEEN SATURDAY
AFTERNOON AND EARLY SUNDAY MORNING.

WHILE THERE REMAIN SOME DIFFERENCES IN THE TRACK...TIMING AND
INTENSITY...ANYTIME THERE IS A FAIRLY STRONG LOW IN THE GULF OF
MEXICO...THE POTENTIAL IS THERE FOR SEVERE WEATHER TO DEVELOP AND
IMPACT EAST CENTRAL FLORIDA. THUS...THERE REMAINS THE POSSIBILITY
FOR AN ORGANIZED SQUALL LINE TO FORM OVER THE CENTRAL AND EASTERN
GULF OF MEXICO AND AFFECT FLORIDA BETWEEN LATE SATURDAY AFTERNOON
AND EARLY SUNDAY MORNING.

PERSONS IN EAST CENTRAL FLORIDA SHOULD CLOSELY MONITOR THE WEATHER
INTO THIS WEEKEND. LISTEN FOR LATER STATEMENTS...FORECASTS...IMPACT
WEATHER UPDATES...AND HAZARDOUS WEATHER OUTLOOKS WHICH WILL REFINE
THE EXPECTED TIMING AND IMPACTS FROM THIS STORM SYSTEM.

BOATING CONDITIONS WILL BECOME HAZARDOUS THIS WEEKEND DUE TO
INCREASING WINDS AND SEAS...AND HIGHER COVERAGE OF STORMS. WINDS
AND SEAS ARE FORECAST TO REMAIN HAZARDOUS MONDAY AS A BRIEF SURGE
OF NORTHEAST WINDS PUSHES SOUTH THROUGH THE WATERS.

.SPOTTER INFORMATION STATEMENT...
SPOTTERS SHOULD MONITOR WEATHER CONDITIONS TODAY AND REPORT ANY
COIN-SIZED HAIL...WIND DAMAGE...OR WATERSPOUTS OR FUNNEL CLOUDS.
ADDITIONALLY...SPOTTERS SHOULD KEEP ABREAST OF THE LATEST
INFORMATION REGARDING THE STORM FORECAST TO DEVELOP IN THE GULF OF
MEXICO BY EARLY SATURDAY.

CRISTALDI/BOWEN

In the hours before

Special weather statement, Apr 20, 2:56 PM EDT, 1 hour before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
256 PM EDT FRI APR 20 2012

FLZ044>046-053-058-144-2020000-
NORTHERN LAKE COUNTY-OKEECHOBEE-ORANGE-OSCEOLA-SEMINOLE-SOUTHERN LAKE
COUNTY-
256 PM EDT FRI APR 20 2012

...A SIGNIFICANT WEATHER ADVISORY IS IN EFFECT FOR STRONG WIND GUSTS
BETWEEN 45 AND 55 MPH AND HAIL OVER LAKE COUNTY...OKEECHOBEE
COUNTY...ORANGE COUNTY...OSCEOLA COUNTY...SEMINOLE COUNTY...

* UNTIL 400 PM EDT.

AT 254 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STORM CAPABLE OF STRONG WINDS AND HAIL OVER LAKE LOUISA...MOVING
EAST AT 15 MPH. ADDITIONAL STORMS ARE EXPECTED TO STRENGTHEN DOWN
THE CENTER OF THE STATE THEN MOVE EAST AS THESE STORMS COLLIDE WITH
STORMS AND OUTFLOWS FROM THE EAST COAST SEA BREEZE.

LOCATIONS IN THE PATH OF THE STORM WHICH MAY EXPERIENCE STRONG WINDS
AND HAIL INCLUDE CLERMONT AND METRO ORLANDO...INCLUDING THE
ATTRACTIONS AREA.

STATE LAW REQUIRES HEADLIGHTS TO BE TURNED ON WHEN WINDSHIELD WIPERS
ARE IN USE.

LAT...LON 2892 8191 2896 8143 2885 8136 2859 8102
      2793 8094 2783 8087 2738 8083 2742 8114
      2749 8121 2760 8114 2771 8115 2783 8122
      2806 8145 2802 8138 2808 8135 2808 8145
      2826 8156 2826 8166 2834 8167 2836 8185
TIME...MOT...LOC 1852Z 260DEG 15KT 2847 8175

52

Special weather statement, Apr 20, 2:56 PM EDT, 1 hour before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
256 PM EDT FRI APR 20 2012

FLZ044>046-053-058-144-202000-
NORTHERN LAKE COUNTY-OKEECHOBEE-ORANGE-OSCEOLA-SEMINOLE-SOUTHERN LAKE
COUNTY-
256 PM EDT FRI APR 20 2012

...A SIGNIFICANT WEATHER ADVISORY IS IN EFFECT FOR STRONG WIND GUSTS
BETWEEN 45 AND 55 MPH AND HAIL OVER LAKE COUNTY...OKEECHOBEE
COUNTY...ORANGE COUNTY...OSCEOLA COUNTY...SEMINOLE COUNTY...

* UNTIL 400 PM EDT.

AT 254 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STORM CAPABLE OF STRONG WINDS AND HAIL OVER LAKE LOUISA...MOVING
EAST AT 15 MPH. ADDITIONAL STORMS ARE EXPECTED TO STRENGTHEN DOWN
THE CENTER OF THE STATE THEN MOVE EAST AS THESE STORMS COLLIDE WITH
STORMS AND OUTFLOWS FROM THE EAST COAST SEA BREEZE.

LOCATIONS IN THE PATH OF THE STORM WHICH MAY EXPERIENCE STRONG WINDS
AND HAIL INCLUDE CLERMONT AND METRO ORLANDO...INCLUDING THE
ATTRACTIONS AREA.

STATE LAW REQUIRES HEADLIGHTS TO BE TURNED ON WHEN WINDSHIELD WIPERS
ARE IN USE.

LAT...LON 2892 8191 2896 8143 2885 8136 2859 8102
      2793 8094 2783 8087 2738 8083 2742 8114
      2749 8121 2760 8114 2771 8115 2783 8122
      2806 8145 2802 8138 2808 8135 2808 8145
      2826 8156 2826 8166 2834 8167 2836 8185
TIME...MOT...LOC 1852Z 260DEG 15KT 2847 8175

52

Local storm report, Apr 20, 3:22 PM EDT, 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MELBOURNE FL
322 PM EDT FRI APR 20 2012

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

0314 PM     HAIL             2 SSE LAKE LOUISA       28.46N 81.72W
04/20/2012  E0.88 INCH       LAKE               FL   CO-OP OBSERVER

            COOP OBSERVER REPORTED ONGOING HAIL INCREASED FROM PEA TO
            DIME TO NICKEL SIZE. STRONG GUSTY WINDS BUT NO DAMAGE AS
            YET.

&&

FXD

Special weather statement, Apr 20, 3:56 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
356 PM EDT FRI APR 20 2012

FLZ041-044>046-053-141-144-202100-
COASTAL VOLUSIA COUNTY-INLAND VOLUSIA COUNTY-NORTHERN LAKE
COUNTY-ORANGE-OSCEOLA-SEMINOLE-SOUTHERN LAKE COUNTY-
356 PM EDT FRI APR 20 2012

...A SIGNIFICANT WEATHER ADVISORY IS IN EFFECT FOR STRONG WIND GUSTS
BETWEEN 45 AND 55 MPH AND HAIL OVER LAKE...ORANGE..OSCEOLA...
SEMINOLE...AND WESTERN VOLUSIA COUNTIES...

* UNTIL 500 PM EDT.

AT 355 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SCATTERED STORMS MOVING EAST AROUND 15 MPH ACROSS THE INTERIOR.
THESE STORMS WILL COLLIDE WITH STORMS AND OUTFLOWS ALONG THE EAST
COAST SEAS BREEZE AND MOVE EAST THROUGH THE LATE AFTERNOON.

THE PRIMARY THREAT WILL BE CLOUD TO GROUND LIGHTNING STRIKES AND
GUSTY WINDS OF 45 TO 55 MPH...WHICH CAN CAUSE UNSECURED OBJECTS TO
BLOW AROUND...SNAP TREE LIMBS OR CAUSE POWER OUTAGES. HEAVY RAINFALL
WILL TEMPORARILY REDUCE VISIBILITY. SEEK SHELTER INDOORS UNTIL THE
STORM PASSES. STORMS TODAY HAVE PRODUCED NICKEL SIZE HAIL...AND
COIN SIZE HAIL WILL ALSO BE POSSIBLE WITH THESE STORMS.

LAT...LON 2938 8142 2927 8141 2926 8128 2842 8092
      2765 8088 2766 8113 2783 8122 2786 8131
      2804 8143 2802 8138 2808 8135 2808 8145
      2814 8153 2825 8156 2828 8166 2834 8167
      2837 8183 2896 8188 2897 8166 2933 8168
TIME...MOT...LOC 1953Z 266DEG 19KT 2837 8148

52

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 3:06 PM EDT	Severe Thunderstorm Warning	MLB	Lake, Orange	38 min
Apr 20, 4:08 PM EDT	Severe Thunderstorm Warning	MLB	Indian River	67 min
Apr 20, 4:09 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Osceola	66 min
Apr 20, 4:15 PM EDT	Special Marine Warning	MLB		2 hr
Apr 20, 4:19 PM EDT	Special Weather Statement	MLB	Martin	41 min
Apr 20, 4:22 PM EDT	Severe Thunderstorm Warning	MLB	Osceola	53 min
Apr 20, 4:29 PM EDT	Special Weather Statement	MLB	Volusia	61 min
Apr 20, 4:35 PM EDT	Severe Thunderstorm Warning	MLB	Volusia	55 min
Apr 20, 4:43 PM EDT	Severe Thunderstorm Warning	MLB	Okeechobee	62 min
Apr 20, 5:04 PM EDT	Severe Thunderstorm Warning	MLB	Lake, Volusia	56 min
Apr 20, 5:20 PM EDT	Special Weather Statement	MLB	Indian River	40 min
Apr 20, 5:34 PM EDT	Special Marine Warning	MLB		116 min
Apr 20, 5:34 PM EDT	Severe Thunderstorm Warning	MLB	Brevard, Osceola	56 min
Apr 20, 5:39 PM EDT	Severe Thunderstorm Warning	MLB	Indian River, Saint Lucie	66 min
Apr 20, 5:59 PM EDT	Special Marine Warning	MLB		2 hr
Apr 20, 6:36 PM EDT	Severe Thunderstorm Warning	MLB	Brevard, Orange, Seminole, Volusia	54 min
Apr 20, 6:49 PM EDT	Special Weather Statement	MLB	Martin	56 min
Apr 20, 7:37 PM EDT	Special Weather Statement	MLB	Brevard	53 min
Apr 20, 7:49 PM EDT	Special Marine Warning	MLB		41 min

Nearby

Special Weather Statements in Florida, 2012 Every special weather statement in 2012

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.