Special Weather Statement, NWS Melbourne, FL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MELBOURNE FL
945 PM EDT MON AUG 20 2012

.UPDATE...

LARGER SCALE OUTFLOW BOUNDARY PUSHING CONVECTION AND ASSOCIATED
DEBRIS-TYPE PRECIP ACROSS THE NORTHERN CWA THIS EVENING. SYNOPTIC
FORCING...UNUSUAL IN ITS LOCATION FOR MID-LATE AUGUST...IS EVIDENT
IN WATERVAPOR/RUC ANLYS FIELDS AS HEALTHY SWATH OF H25 DIVG SPREADS
EASTWARD FORM THE GOMEX INTO FLORIDA. THIS LENDS CREDENCE TO DAY
SHIFT THINKING THAT ACTIVITY WILL HOLD TOGETHER AS IT IMPACTS THE
NORTHERN CWA OVERNIGHT. ALSO WATCHING CELLULAR CONVECTION FARTHER
SOUTH OVER SW FL...INLAND FROM KPGD-KSRQ...AND PUSHING NE TOWARD
POLK COUNTY AND THE KISM RIVER. TEMPS STILL AS WARM AS M80S IN THE
"UNUSED" AIR MASS AHEAD OF IT...SO THINK SHRA AND FEW TS COULD POP
UP FOR THE NEXT SEVERAL HOURS ACROSS THE CENTRAL CWA AS WELL.

OVERALL...THE CURRENT FORECAST HAS A PRETTY GOOD HANDLE ON THINGS
...BUT PLAN TO TWEAK TO SHOW SCT SHRA/ISOLD TS FOR THE NORTH...AND
BRING COVERAGE OF SCT SHRA/TS FARTHER SOUTH INTO THE CENTRAL CWA.

&&

MARINE...S-SSW WINDS 10-15KT WITH SEAS 2-3FT. SCT SHOWERS/TS
CONTINUING MUCH OF THE NIGHT. NOSIG CHANGES TO THE ONGOING FCST.

&&

.FORECAST/AVIATION...CRISTALDI
.RADAR/IMPACT WX UPDATES...WEITLICH

&&

.PREV DISCUSSION... /ISSUED 306 PM EDT MON AUG 20 2012/

...CHANCE FOR STRONG STORMS THIS EVENING...ESPECIALLY NORTH...

CURRENTLY-TONIGHT...OVERALL LITTLE CHANGE FROM THE PATTERN
YESTERDAY WITH LARGE CONVECTIVE COMPLEX MARCHING ACROSS NORTH
FLORIDA WITH ISOLATED TO SCATTERED CONVECTION DEVELOPING OUT AHEAD
OF IT ACROSS THE NORTH CENTRAL PENINSULA. THE ATMOSPHERE FARTHER
SOUTH WAS A LITTLE DRIER AND CELLS HAVE BEEN SLOWER TO GET GOING.
ONE THING THAT IS DIFFERENT IS THAT THE SEA BREEZE WAS KICKING IN
ALONG THE COAST...ESPECIALLY THE SPACE AND TREASURE COAST WHERE
GUSTS OVER 15 KNOT WERE OCCURRING. THE COOLER THAN NORMAL SURF
TEMPS IN THE MID 70S ARE LIKELY HELPING TO ENHANCE THE GUSTS.

WITH THE SEA BREEZE IN THE MIX...WILL HOLD ONTO SCATTERED EVENING
POPS ACROSS THE AREA. EXPECT THAT THE HIGHEST COVERAGE WILL BE OVER
THE NORTH THROUGH SUNSET WHERE BOUNDARY INTERACTIONS WILL BE THE
MOST NUMEROUS AND STRONGEST.

TUE-WED...LITTLE CHANGE IS INDICATED FOR TUE WITH TROUGH ALOFT
OVER THE EASTERN PART OF THE COUNTRY AND EXTENDING INTO THE NORTH
GULF. THIS TROUGH WILL WEAKEN ON WED...BUT SOME INFLUENCE WILL
CONTINUE TO BE FELT LOCALLY.

FOR TUE...THE AREA WILL BE IN THE RIGHT REAR QUADRANT OF STRONG
JET ALONG THE EASTERN SEABOARD. THE GFS SHOWS STRONG DIVERGENCE
ALOFT AND SLIGHTLY COOLER MID LEVEL TEMPERATURES. WITH BETTER LIFT
AND INSTABILITY...EXPECT THAT CONVECTION WILL INITIATE EARLIER AND
POPS WILL BE IN THE LIKELY RANGE FOR MUCH OF THE AREA...AS SHOWN
BY MOS. THE ONLY CONCERN MIGHT BE EXTENSIVE MID/HIGH LEVEL
CLOUDINESS. THIS MAY DELAY ONSET...BUT THINK THAT IT WILL NOT
SEVERELY LIMIT POPS. EXPECT STRONG GUSTY WINDS WITH SOME STORMS
AND IF HEATING IN FULLY REALIZED...HAIL WILL BECOME MORE OF A THREAT.

FOR WED...THE TROUGH ALOFT WILL CONTINUE TO WEAKEN...BUT SOUTHWEST
STEERING FLOW WILL BE MAINTAINED. THE SURFACE RIDGE WILL START TO
MIGRATE BACK TOWARDS CENTRAL FLORIDA...WHICH WILL CAUSE THE
PRESSURE GRADIENT TO WEAKEN...SO THE SEA BREEZE BOUNDARY WILL PUSH
WELL INLAND.  ADEQUATE MOISTURE/INSTABILITY AND NUMEROUS BOUNDARY
INTERACTIONS SHOULD KEEP THE POPS AT OR ABOVE NORMAL. MOS VALUES
ARE 50 PERCENT ACROSS MOST OF THE AREA AND WILL NOT DEVIATE FROM
THEM MUCH.

THU-SUN (PREVIOUS DISCUSSION)...UPPER TROUGH OVER THE EASTERN
CONUS CONTINUES TO WEAKEN AND SLIDE EASTWARD BY FRI. A BIT OF
UNCERTAINTY AFTER THIS IN THE LARGE-SCALE PATTERN AS MUCH WILL
DEPEND ON THE TROPICS TO THE SOUTH. LATEST GFS BRINGS THE NEXT
TROPICAL SYSTEM TO NEAR CUBA BY LATE FRI...WHICH IS SPED UP FROM
PREVIOUS MODEL RUNS. THIS SEEMS TOO FAST. THE ECMWF CONTINUES TO
KEEP THIS NEXT SYSTEM WEAK...SLOWER AND FURTHER SOUTH THAN THE
GFS. FOR NOW WILL NOT CHANGE MUCH IN THE CURRENT GRIDS FOR THE
WEEKEND AND KEEP NEAR SEASONAL CONDITIONS IN PLACE FOR CONSISTENCY
SAKES. AT THE SURFACE IT DOES APPEAR A GRADUAL LIFTING NORTHWARD
OF THE RIDGE AXIS WILL TAKE PLACE. AS THIS OCCURS A DEEPER
EASTERLY ONSHORE FLOW CAN BE EXPECTED WHICH WOULD PROVIDE A DAILY
AND EARLIER ONSET OF THE EAST COAST SEA BREEZE WITH DEEPER
PENETRATION INLAND AND POSSIBLE HIGHER POPS INTO THE INTERIOR AWAY
FROM THE COAST THROUGH THE AFTERNOON/EVENING. TEMPERATURES TO
REMAIN WITHIN A DEGREE OR TWO OF NORMAL EACH DAY. &&

.AVIATION...
BOUNDARY INTERACTIONS SHOULD MULTIPLY THROUGH EVENING...ESPECIALLY
SINCE THE EAST COAST SEA BREEZE HAS FORMED. THE GREATEST CHANCE
FOR STORMS SHOULD BE KISM-KMCO-KTIX NORTHWARD. BUT EVENTUALLY
SCATTERED STORMS SHOULD AFFECT THE KMLB-KSUA CORRIDOR BY EARLY
EVENING.

TUE LOOKS COMPLICATED WITH A CONSIDERABLE AMOUNT TO MID/HIGH LEVEL
CLOUDINESS LINGERING FROM THE ACTIVITY THIS EVENING. LARGE SCALE
LIFT WILL BE STRONGER AND TEMPS ALOFT COOLER...SO EVENTUALLY
EXPECT SCATTERED TO NUMEROUS SHOWERS/STORMS TO FORM DURING THE
AFTERNOON.

&&

.MARINE...
CURRENTLY-TONIGHT...AFTER A MOSTLY SUNNY DAY OVER THE ATLANTIC...
EXPECT BIG CHANGES LATE IN THE AFTERNOON AND INTO THE EVENING AS
STORMS GET GOING OVER THE MAINLAND AND PROGRESS OFFSHORE...ESPECIALLY
FROM CANAVERAL NORTHWARD. THIS ACTIVITY COULD LINGER WELL INTO THE
OVERNIGHT HOURS.

TUE-WED...HIGH PRESSURE RIDGE WILL STAY SUPPRESSED SOUTH OF THE
WATERS TUE THAN START TO NUDGE BACK TO THE NORTH ON WED. LITTLE
CHANGE IS EXPECTED IN THE SOUTHWEST FLOW PATTERN TUE (NEAR 10
KNOTS EXCEPT 10-15 KNOTS OFFSHORE/NORTH SECTIONS). THEN ON WED THE
GRADIENT WILL SUPPORT 10 KNOTS MAX. OFFSHORE MOVING STORMS WILL BE
THE MAIN HAZARD BOTH DAYS...PRIMARILY IN THE AFTERNOON BUT STORMS
COULD LINGER WELL INTO TUE EVENING.

THU-FRI...(PREVIOUS DISCUSSION) THE WEAK LOW-LEVEL RIDGE AXIS
WILL CONTINUE TO CREEP BACK NORTHWARD DURING THIS TIME. ONSHORE
FLOW WILL RETURN DURING THE DAY ON THU AND INTO FRI WITH THE
PRESSURE GRADIENT REMAINING LIGHT. WITH THE FLOW STRONGER
NORTHWARD...A FEW STORMS MAY STILL MOVE OFF THE COAST...ESPECIALLY
CAPE CANAVERAL NORTHWARD...THOUGH MOVEMENT WILL BE SLOWER THAN THE
PREVIOUS COUPLE OF DAYS. SEAS 1-2 FT NEAR SHORE AND 2-3 FT
OFFSHORE.

&&

.PRELIMINARY POINT TEMPS/POPS...
DAB  75  86  73  90 /  30  60  30  50
MCO  75  90  74  91 /  30  60  30  50
MLB  76  89  73  90 /  30  50  30  50
VRB  75  91  73  92 /  30  50  30  50
LEE  76  88  74  91 /  30  70  30  50
SFB  77  88  74  92 /  30  60  30  50
ORL  77  89  75  91 /  30  60  30  50
FPR  75  91  72  91 /  30  50  30  50

&&

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

FORECASTS...LASCODY
IMPACT WEATHER...WIMMER

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MELBOURNE FL
1116 AM EDT MON AUG 20 2012

AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141-
144-147-202115-
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-
1116 AM EDT MON AUG 20 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

.THUNDERSTORM IMPACT...
SCATTERED TO NUMEROUS LIGHTNING STORMS WILL MOVE TO THE NORTHEAST
AT 15 TO 20 MPH. THE HIGHEST COVERAGE OF STORMS WILL BE FROM PONCE
INLET TO SANFORD AND CLERMONT NORTHWARD WITH A BETTER CHANCE FOR
MORE WIDESPREAD STRONG WIND GUSTS THAN PREVIOUS DAYS. ONE OR TWO
STORMS MAY PRODUCE DAMAGING WINDS NEAR 60 MPH...FREQUENT LIGHTNING
STRIKES AND POSSIBLY SMALL HAIL. A LOWER COVERAGE OF STORMS IS
EXPECTED SOUTH OF ORLANDO. LATE AFTERNOON STORMS APPROACHING THE
COAST MAY BECOME STRONG AS THEY INTERACT WITH THE EAST COAST SEA
BREEZE. THESE STORMS WILL HAVE THE POTENTIAL TO PRODUCE FREQUENT
TO EXCESSIVE LIGHTNING STRIKES AND ISOLATED WIND GUSTS TO 60 MPH.

STORMS DECREASE IN COVERAGE TOWARD SUNSET WITH LINGERING LIGHT
RAIN ENDING BY MIDNIGHT.

.MARINE THUNDERSTORM GUST IMPACT...
SCATTERED LIGHTNING STORMS WILL MOVE TO THE NORTHEAST AT 15 TO 20
KNOTS AND OFFSHORE. WIDESPREAD STRONG WIND GUSTS OF 35 TO 45 KNOTS
MAY IMPACT INLAND LAKES SUCH AS LAKE GEORGE AND LAKE APOPKA...AS
WELL AS THE INTRACOASTAL AND NEARSHORE ATLANTIC WATERS THROUGH
SUNSET. ONE OR TWO STORMS WILL BE CAPABLE OF PRODUCING 50 KNOTS
ALONG WITH FREQUENT LIGHTNING STRIKES.

.WATERSPOUT IMPACT...
STORMS INTERACTING WITH THE EAST COAST SEA BREEZE NEAR THE COAST
MAY PRODUCE BRIEF FUNNEL CLOUDS OR A WATERSPOUT AS THEY MOVE
ACROSS THE INTRACOASTAL AND NEARSHORE ATLANTIC WATERS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
THE ATLANTIC SURFACE RIDGE WILL REMAIN SUPPRESSED SOUTH OF FLORIDA
DURING THE EARLY PART OF THE WEEK BEFORE SLOWLY LIFTING NORTHWARD
INTO CENTRAL FLORIDA BY LATE WEEK. SCATTERED AFTERNOON LIGHTNING
STORMS WILL CONTINUE TO PUSH TOWARD THE EAST COAST AND OFFSHORE
THROUGH WEDNESDAY. THEN A CHANGE IN THE STEERING FLOW LATER IN THE
WEEK WILL ALLOW FOR MORE INLAND PENETRATION OF THE EAST COAST SEA
BREEZE AND SHIFT THE HIGHEST COVERAGE OF AFTERNOON SHOWERS AND
STORMS FROM THE COAST TO THE INTERIOR.

.SPOTTER INFORMATION STATEMENT...
SPOTTERS ARE REQUESTED TO MONITOR THE WEATHER AND SELF ACTIVATE
IF NEEDED.

KELLY/UPDATE WIMMER

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
620 PM EDT MON AUG 20 2012

FLZ045-046-141-147-202300-
COASTAL VOLUSIA COUNTY-NORTHERN BREVARD COUNTY-ORANGE-SEMINOLE-
620 PM EDT MON AUG 20 2012

...A SIGNIFICANT WEATHER ADVISORY IS IN EFFECT FOR STRONG WIND GUSTS
BETWEEN 45 AND 55 MPH OVER NORTHWESTERN BREVARD COUNTY...EASTERN
ORANGE COUNTY...SOUTHEASTERN SEMINOLE COUNTY...SOUTHEASTERN VOLUSIA
COUNTY...

* UNTIL 700 PM EDT.

AT 615 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STORM CAPABLE OF PRODUCING STRONG WIND GUSTS 12 MILES SOUTHWEST OF
MAYTOWN...MOVING NORTHEAST AT 25 MPH.

LOCATIONS IN THE PATH OF THE STORM WHICH MAY EXPERIENCE STRONG WINDS
INCLUDE APOLLO BEACH AND ELDORA.

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.

LAT...LON 2876 8070 2874 8072 2877 8075 2878 8074
      2881 8078 2885 8078 2885 8081 2873 8074
      2872 8076 2877 8084 2868 8082 2853 8104
      2864 8118 2903 8088
TIME...MOT...LOC 2220Z 220DEG 21KT 2868 8104

WEITLICH

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MELBOURNE FL
627 PM EDT MON AUG 20 2012

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

0620 PM     FUNNEL CLOUD     INDIALANTIC             28.09N 80.57W
08/20/2012                   BREVARD            FL   TRAINED SPOTTER

            615 TO 620 PM HALF WAY DOWN, THEN A THIRD WAY DOWN BEFORE
            DISSIPATING.MOVING OFFSHORE.

&&

FXD

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
643 PM EDT MON AUG 20 2012

FLZ059-202330-
ST. LUCIE-
643 PM EDT MON AUG 20 2012

...A SIGNIFICANT WEATHER ADVISORY IS IN EFFECT FOR STRONG WIND GUSTS
BETWEEN 45 AND 55 MPH OVER EASTERN ST. LUCIE COUNTY...

* UNTIL 730 PM EDT.

AT 639 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF STORMS CAPABLE OF PRODUCING STRONG WIND GUSTS FROM 6 MILES
SOUTHWEST OF SAINT LUCIE VILLAGE TO 8 MILES SOUTHWEST OF PORT SAINT
LUCIE...MOVING NORTHEAST AT 15 MPH.

LOCATIONS IN THE PATH OF THE STORM WHICH MAY EXPERIENCE STRONG WINDS
INCLUDE INDIAN RIVER ESTATES...PORT SAINT LUCIE RIVER PARK...QUEENS
COVE AND SAINT LUCIE WEST.

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.

LAT...LON 2726 8021 2728 8023 2726 8023 2726 8028
      2721 8028 2721 8046 2726 8043 2749 8052
      2756 8035 2756 8031 2746 8028 2742 8026
      2740 8026 2733 8021 2727 8019
TIME...MOT...LOC 2243Z 230DEG 13KT 2747 8041 2732 8035
          2721 8042

CRISTALDI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
648 PM EDT MON AUG 20 2012

FLZ064-202330-
MARTIN-
648 PM EDT MON AUG 20 2012

...A SIGNIFICANT WEATHER ADVISORY IS IN EFFECT FOR STRONG WIND GUSTS
BETWEEN 45 AND 55 MPH OVER MARTIN COUNTY...

* UNTIL 730 PM EDT.

AT 644 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STORM CAPABLE OF PRODUCING STRONG WIND GUSTS OVER INDIANTOWN...MOVING
NORTHEAST AT 25 MPH.

LOCATIONS IN THE PATH OF THE STORM WHICH MAY EXPERIENCE STRONG WINDS
INCLUDE STUART...PALM CITY...PORT SALERNO AND ROCKY POINT.

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.

LAT...LON 2697 8051 2704 8055 2721 8034 2721 8029
      2725 8028 2726 8027 2726 8019 2721 8017
      2721 8015 2718 8014 2716 8015 2709 8012
      2695 8036 2695 8049
TIME...MOT...LOC 2248Z 225DEG 24KT 2703 8041

CRISTALDI

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MELBOURNE FL
716 PM EDT MON AUG 20 2012

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

0700 PM     FLOOD            3 NNE PORT SAINT LUCIE  27.32N 80.34W
08/20/2012                   ST. LUCIE          FL   TRAINED SPOTTER

            FLOODING ON PRIMA VISTA BLVD.

&&

FXD

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
1128 PM EDT MON AUG 20 2012

FLZ045-053-210415-
ORANGE-OSCEOLA-
1128 PM EDT MON AUG 20 2012

...A SIGNIFICANT WEATHER ADVISORY IS IN EFFECT FOR STRONG WIND GUSTS
BETWEEN 40 AND 50 MPH OVER SOUTHWESTERN ORANGE COUNTY...NORTHWESTERN
OSCEOLA COUNTY...

* UNTIL 1215 AM EDT.

AT 1124 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STORM CAPABLE OF PRODUCING STRONG WIND GUSTS OVER INTERCESSION
CITY...MOVING EAST AT 25 MPH.

LOCATIONS IN THE PATH OF THE STORM WHICH MAY EXPERIENCE STRONG WINDS
INCLUDE CAMPBELL...KISSIMMEE...LAKE BUENA VISTA...SAINT CLOUD.

THE PRIMARY THREAT WILL BE CLOUD TO GROUND LIGHTNING STRIKES AND
GUSTY WINDS OF 40 TO 50 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.

LAT...LON 2854 8131 2822 8118 2817 8152 2820 8153
      2825 8156 2825 8166 2826 8166 2834 8166
TIME...MOT...LOC 0327Z 255DEG 21KT 2827 8156

KELLY