Special Weather Statement, NWS Melbourne, FL

Area Forecast Discussion
National Weather Service Melbourne FL
340 PM EDT SAT JUL 9 2016

.DISCUSSION...

Tonight...
Very weak dynamic support over central FL as RAP40 analysis reveals
a dearth of H85-H30 vorticity and a convergent H30-H20 lyr. Deep lyr
moisture remains sparse with H100-H70 mean RH values AOB 70pct...
H85-H30 values aob 40pct. Streamline analysis reveals the ridge axis
extending from Tampa Bay to Lake-O to the nrn Bahamas...but very
weak flow with mean winds AOB 10KTS thru the entire H100-H50 lyr.
Mid lvl thermal ridge is combining with the weak steering flow to
keep diurnal convection in check despite marginal H70-H50 lapse
rates arnd 6.5C/KM...most storms so far have dvlpd and dissipated
within a 5-10NM radius.

What little S/SW steering flow that does exist will tend to focus
any seabreeze/tstorm convergence along and N of the I-4 corridor...
but given the lack of moisture/dynamic support...most convective
activity will be done by mid evng. Will carry slgt chc of tsras thru
03Z...quiet WX thereafter. Srly winds will keep sfc dewpoints in the
sultry M70s...min temps in the M/U70s.

Sun/Mon...
Gradual pattern shift as a storm system over the ern Great Lakes
region pushes into the Canadian Maritimes...carrying a broad short
wave trof along with it into the W Altc. This will allow the Bermuda
Ridge to drift back to the north...albeit slowly... eventually to
reposition itself acrs the panhandle/nrn peninsula early next week.
The lcl airmass will largely suppressed as the ridge transits the
central peninsula...though mid lvl steering winds will make shift to
the south on Sun...then to the S/SE on Mon.

The shifting steering winds will push the focus for diurnal
convection more to the interior as the diminishing wrly flow will
allow greater inland penetration of the east coast sea breeze.
However...deep lyr moisture and mid lvl dynamic support will
continue to impede diurnal convection as the airmass over the
eventual source region is quite unenergetic. RAP40 analysis shows
little in the way of low/mid lvl moisture acrs the entire Bahama
Bank clear back to the Mona Passage...along with minimal mid lvl
vorticity and upr lvl winds AOB 20KTS.

Will keep PoPs AOB 20pct on Sun...and a 20/30 coastal/inland split
on Mon to account for the increasing SE steering component. Sun aftn
max temps will cont in the M90s due to the srly winds and limited
potential for seabreeze penetration. The same srly winds will keep
Sun night min temps in the M/U70s. By Mon...stronger SE wind
component will allow the sea breeze to make much further inland
progress...should see coastal max temps return closer to their L90s
climo avgs. Little relief for interior regions...however...as
limited storm potential keeps max temps in the M90s.

Tue-Fri...(modified prev disc)
The Bermuda Ridge axis will remain firmly in place over the FL
peninsula with a slight northward jog into the panhandle/nrn
peninsula area by midweek. Deep layer ridging looks to persist
through the period, keeping shower and thunderstorm coverage AOB
40pct focused generally across the interior in the mid to late
afternoon. A slug of moisture and associated higher PWATs moving in
from the south and east on Tuesday could help increase shower/storm
coverage mid week, though confidence in this solution remains low to
moderate considering the rather stagnant/low-flow pattern that
remains.

Light offshore flow on Sunday, outside of the afternoon sea breeze
circulation, will gradually back to a more southerly and perhaps
even a southeasterly direction as the ridge axis is forecast to
nudge slightly northward. Temperatures will remain above normal into
next week with lower to mid 90s expected for much of the area.

&&

.AVIATION...Thru 10/18Z.
Sfc Winds: Thru 10/01Z...coastal sites E/SE 7-11KTS...interior sites
W/SW 6-10kts. Btwn 10/01Z-10/04Z...bcmg S/SW 2-4KTS. Btwn 10/13Z-
10/15Z...bcmg S/SW 6-10KTS.

Vsbys/WX/Cigs: Thru 10/00Z...interior sites sct MVFR shras/isold IFR
tsras...coastal sites isold MVFR shra/IFR tsras. Btwn 10/00Z-
10/02Z...W of KEVB-KOBE slgt chc IFR tsras.

&&

.MARINE...
Tonight...Bermuda Ridge axis over the Nrn Bahamas/Lake-O Region will
generate a light to gentle southerly breeze...S/SE thru late evng...
bcmg S/SW aft midnight as the land breeze circulation dvlps.
Favorable marine conds with seas AOB 2FT nearshore and 2-3FT
offshore...mainly in a long pd background swell.

Sun-Thu...Ridge axis will drift slowly north thru central FL
Sun/Mon...then into the into the north peninsula/panhandle region by
mid week. A gradual windshift will occur as a result...from a light
to gentle S/SW breeze on Sun to gentle to moderate S/SE on Mon...
diminishing to a light to gentle S/SE breeze Tue-Thu. Favorable
boating conds with Treasure Coast seas AOB 2FT nearshore and up to
3ft in the Gulf Stream...north of Sebastian Inlet 2-3FT nearshore
and up to 4FT in the Gulf Stream.

&&

.PRELIMINARY POINT TEMPS/POPS...
DAB  76  92  75  90 /  20  20  20  20
MCO  78  95  75  94 /  20  20  20  30
MLB  77  92  76  90 /  10  20  10  20
VRB  74  92  74  90 /  10  20  10  20
LEE  78  95  76  94 /  20  20  20  30
SFB  76  95  76  94 /  20  20  20  30
ORL  78  95  76  94 /  20  20  20  30
FPR  74  92  74  90 /  10  20  10  20

&&

.MLB Watches/Warnings/Advisories...
FL...None.
AM...None.

&&

Public/Marine Forecast.....Bragaw
Radar/Aviation/Impact WX...Kelly

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MELBOURNE FL
1015 AM EDT SAT JUL 9 2016

AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141-
144-147-092300-
FLAGLER BEACH TO VOLUSIA-BREVARD COUNTY LINE 0-20 NM-VOLUSIA-
BREVARD COUNTY LINE TO SEBASTIAN INLET 0-20 NM-
SEBASTIAN INLET TO JUPITER INLET 0-20 NM-FLAGLER BEACH TO VOLUSIA-
BREVARD COUNTY LINE 20-60 NM-VOLUSIA-
BREVARD COUNTY LINE TO SEBASTIAN INLET 20-60 NM-
SEBASTIAN INLET TO JUPITER INLET 20-60 NM-INLAND VOLUSIA COUNTY-
NORTHERN LAKE COUNTY-ORANGE-SEMINOLE-SOUTHERN BREVARD COUNTY-
OSCEOLA-INDIAN RIVER-OKEECHOBEE-ST. LUCIE-MARTIN-
COASTAL VOLUSIA COUNTY-SOUTHERN LAKE COUNTY-
NORTHERN BREVARD COUNTY-
1015 AM EDT SAT JUL 9 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

.THUNDERSTORM IMPACT...
STRONG SURFACE HEATING WILL COMBINE WITH BOUNDARY COLLISIONS AND
LIMITED MOISTURE TO PRODUCE SCATTERED LIGHTNING STORMS THIS
AFTERNOON AND EARLY EVENING. HIGHEST STORM CHANCES WILL EXIST OVER
THE INTERIOR WHERE THE BEST BOUNDARY COLLISIONS WILL OCCUR MAINLY
ALONG THE I-4 CORRIDOR SOUTH ACROSS OSCEOLA COUNTY. STORM MOTION
WILL BE SLOWLY TOWARD THE NORTHEAST TO EAST AT AROUND 5 TO 10 MPH.

INSTABILITY ALOFT WILL CONTRIBUTE TO A FEW STRONG STORMS CONTAINING
FREQUENT CLOUD TO GROUND LIGHTNING, SMALL HAIL AND WIND GUSTS UP TO
50 MPH. IF YOU HEAR THUNDER, STOP OUTDOOR ACTIVITIES AND HEAD
INDOORS.

.FLOOD IMPACT...
SLOW MOVEMENT OF STORMS WILL ALLOW FOR THE STRONGER CELLS TO PRODUCE
ONE TO TWO INCHES OF RAINFALL IN LESS THAN ONE HOUR. THIS WILL
LIKELY LEAD TO NUISANCE STANDING WATER ALONG LOW SPOTS AND ON SOME
ROADWAYS.

.EXCESSIVE HEAT IMPACT...
THE COMBINATION OF TEMPERATURES CLIMBING INTO THE MID 90S AND HIGH
HUMIDITY LEVELS WILL PRODUCE HEAT INDICES OF 103 TO 107 THIS
AFTERNOON. IF YOU WILL BE WORKING OR RECREATING OUTDOORS, DRINK
PLENTY OF WATER AND TAKE FREQUENT BREAKS OUT OF THE DIRECT SUN.

.RIP CURRENT IMPACT...
OCEAN CONDITIONS WILL PRODUCE A MODERATE RISK OF RIP CURRENTS AT THE
BEACHES OF EAST CENTRAL FLORIDA. THE GREATEST THREAT WILL OCCUR LATE
THIS AFTERNOON AND EARLY EVENING DUE TO TIDAL EFFECTS. ALWAYS SWIM
WITHIN SIGHT OF A LIFEGUARD AND NEVER SWIM ALONE.

.MARINE THUNDERSTORM GUST IMPACT...
A FEW LIGHTNING STORMS MAY PRODUCE WIND GUSTS TO 35 KNOTS AND
FREQUENT LIGHTNING STRIKES OVER INLAND LAKES OF CENTRAL FLORIDA.
STORM MOTION WILL BE TOWARD THE NORTHEAST AT 5 TO 10 KNOTS. A FEW
STORMS MAY PUSH OVER THE INTRACOASTAL WATERS NORTH OF MOSQUITO
LAGOON AND VOLUSIA COUNTY EARLY THIS EVENING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.
SCATTERED TO ISOLATED STORMS REMAIN IN THE FORECAST NEXT WEEK MAINLY
OVER INTERIOR SECTIONS. ANY SUMMER STORMS THAT DEVELOP WILL BE
CAPABLE OF PRODUCING LOCAL HEAVY RAINFALL, STRONG GUSTY WINDS AND
FREQUENT LIGHTNING STRIKES.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY.

KELLY/PENDERGRAST

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MELBOURNE FL
436 PM EDT SAT JUL 09 2016

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

0430 PM     TSTM WND GST     3 W PLAYALINDA BEACH    28.64N 80.67W
07/09/2016  M43.00 MPH       BREVARD            FL   OTHER FEDERAL

            USAF TOWER KSC-0714

&&

JRS

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
602 PM EDT SAT JUL 9 2016

FLZ053-058-092245-
OSCEOLA FL-OKEECHOBEE FL-
602 PM EDT SAT JUL 9 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN OKEECHOBEE AND
SOUTH OSCEOLA COUNTIES UNTIL 645 PM EDT...

AT 600 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
NORTH OF KISSIMMEE PRAIRIE PRESERVE...OR 14 MILES SOUTH OF LAKE
MARIAN...MOVEMENT WAS SLOW AND ERRATIC. OTHER STRONG STORMS WERE
DEVELOPING JUST SOUTH OF LAKE MARIAN AND JUST SOUTH OF KISSIMMEE
PRAIRIE PRESERVE.

HALF INCH HAIL AND WIND GUSTS OF 50 TO 55 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
LAKE MARIAN AND KISSIMMEE PRAIRIE PRESERVE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING AND TORRENTIAL DOWNPOURS ARE
OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 10 MILES AWAY FROM A
THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 2752 8120 2753 8121 2755 8121 2756 8118
      2760 8114 2764 8114 2766 8113 2768 8115
      2771 8115 2773 8117 2774 8116 2775 8118
      2776 8117 2782 8121 2785 8124 2785 8128
      2793 8102 2754 8089
TIME...MOT...LOC 2200Z 087DEG 6KT 2767 8110

SEDLOCK

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
615 PM EDT SAT JUL 9 2016

FLZ044>046-053-092315-
NORTHERN LAKE COUNTY FL-OSCEOLA FL-ORANGE FL-SEMINOLE FL-
615 PM EDT SAT JUL 9 2016

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN ORANGE...WESTERN SEMINOLE
AND NORTHWESTERN OSCEOLA COUNTIES UNTIL 715 PM EDT...

AT 612 PM EDT...DOPPLER RADAR WAS TRACKING DEVELOPING STRONG
THUNDERSTORMS OVER WINTER GARDEN...PINE HILLS AND
LONGWOOD...MOVEMENT WILL BE SLOW AND ERRATIC.

WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH A FEW OF THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
ORLANDO...KISSIMMEE...SANFORD...APOPKA AND ALTAMONTE SPRINGS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL WILL OCCUR WITH A FEW STORMS...AND MAY LEAD TO
LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING WILL ALSO BE POSSIBLE WITH A FEW
STORMS. LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK
A SAFE SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 2886 8136 2885 8136 2883 8132 2883 8127
      2826 8127 2819 8152 2826 8156 2826 8166
      2859 8165 2879 8166
TIME...MOT...LOC 2212Z 092DEG 15KT 2852 8159

SEDLOCK

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