Alert archive / Florida / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 47, NWS Melbourne, FL

June 30, 2015Martin County, Okeechobee County, Saint Lucie County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jun 30, 2015, 9:08 PM EDT for Martin County, Okeechobee County, Saint Lucie County, Florida. It was in force for 37 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 30, 2015, 9:08 PM EDT (01:08 UTC)
Expired: Jun 30, 2015, 9:45 PM EDT
In force: 37 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Martin County, FL, Okeechobee County, FL, Saint Lucie County, FL

The radar

The Melbourne radar (KMLB), 82 km from the middle of the area, began a volume at 01:11 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.

What was reported inside it

Time	Report	Where	Remark
Jun 30, 9:14 PM EDT	TSTM WND GST 39	Saint Lucie Airport, FL	THE ASOS AT THE SAINT LUCIE COUNTY AIRPORT MEASURED A 34-KNOT/39-MPH WIND GUST OUT OF THE NORTH NORTHWEST AS A THUNDERSTORM MOVED OVER THE AIRFIELD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 00:00Z, 1.1 hours before the alert went out and 118 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: 2640 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 1066 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 134 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.

505 
WUUS52 KMLB 010108
SVRMLB
FLC085-093-111-010145-
/O.NEW.KMLB.SV.W.0047.150701T0108Z-150701T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
908 PM EDT TUE JUN 30 2015

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ST. LUCIE COUNTY IN EAST CENTRAL FLORIDA...
  SOUTHEASTERN OKEECHOBEE COUNTY IN EAST CENTRAL FLORIDA...
  NORTHWESTERN MARTIN COUNTY IN EAST CENTRAL FLORIDA...

* UNTIL 945 PM EDT

* AT 908 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THIS
  STORM WAS LOCATED NEAR SAINT LUCIE AIRPORT...OR NEAR INDRIO...AND
  MOVING SOUTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  PORT SAINT LUCIE...FORT PIERCE...OKEECHOBEE...SAINT LUCIE NUCLEAR
  POWER PLANT AND WHITE CITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

&&

LAT...LON 2734 8092 2756 8050 2755 8035 2753 8035
      2751 8034 2753 8032 2755 8033 2755 8032
      2747 8029 2746 8032 2741 8031 2734 8028
      2736 8026 2737 8026 2734 8024 2734 8027
      2731 8026 2707 8062
TIME...MOT...LOC 0108Z 309DEG 15KT 2749 8043 

$$

CRISTALDI

1 follow-up statement

176 
WWUS52 KMLB 010121
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
921 PM EDT TUE JUN 30 2015

FLC085-093-111-010145-
/O.CON.KMLB.SV.W.0047.000000T0000Z-150701T0145Z/
ST. LUCIE FL-OKEECHOBEE FL-MARTIN FL-
921 PM EDT TUE JUN 30 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM EDT
FOR ST. LUCIE...SOUTHEASTERN OKEECHOBEE AND NORTHWESTERN MARTIN
COUNTIES...

AT 920 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 7 MILES 
WEST OF SAINT LUCIE AIRPORT TO OKEECHOBEE...MOVING SOUTHEAST AT 20 
MPH.

LOCATIONS IMPACTED INCLUDE...
PORT SAINT LUCIE...FORT PIERCE...OKEECHOBEE...SAINT LUCIE NUCLEAR
POWER PLANT AND WHITE CITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

&&

LAT...LON 2734 8092 2756 8050 2755 8035 2753 8035
      2751 8034 2753 8032 2755 8033 2755 8032
      2747 8029 2746 8032 2741 8031 2734 8028
      2736 8026 2737 8026 2734 8024 2734 8027
      2731 8026 2707 8062
TIME...MOT...LOC 0120Z 325DEG 30KT 2747 8049 2729 8083 

$$

CRISTALDI

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jun 30, 2:59 PM EDT, 6 hours 9 minutes earlier.

Area forecast discussion, Jun 30, 2:59 PM EDT, 6 hours 9 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MELBOURNE FL
259 PM EDT TUE JUN 30 2015

.DISCUSSION...

CURRENTLY-TONIGHT...DRIER AIR ALOFT THAT WAS EVIDENT IN THE MORNING
SOUNDING FROM TAMPA HAS KEEP CONVECTION LIMITED SO FAR THIS AFT AS
IT HAS SPREAD EASTWARD. HRRR MODEL STILL INDICATING SOME INCREASE IN
SHOWERS AND STORMS BUT COVERAGE SHOULD STILL REMAIN ON THE LOWER
END WITH BEST CHANCE FOR RAIN ALONG THE COAST INTO LATE AFT AND
SUNSET. THIS WILL BE ESPECIALLY TRUE WHERE BOUNDARY COLLISIONS
OCCUR ALONG THE STALLED EAST COAST SEA BREEZE SOUTH OF THE CAPE.
ANY PRECIP WILL PUSH OFFSHORE INTO THE EARLY EVE WITH RAIN CHANCES
ENDING FOR THE REST OF THE NIGHT. OVERNIGHT LOWS WILL RANGE FROM
THE LOW TO MID 70S WITH SKIES MOSTLY CLEAR TO PARTLY CLOUDY.

WED...MID LEVEL TROUGH OVER THE EASTERN U.S. WILL KEEP ATL RIDGE
AXIS SOUTH OF THE AREA WED. MODELS SHOW LOW LEVEL OFFSHORE FLOW
WEAKENS...WHICH SHOULD ALLOW THE EAST COAST SEA BREEZE TO FORM ALONG
MUCH OF THE COAST. HOWEVER IT WILL STILL LIKELY BE DELAYED WITH
LITTLE INLAND MOVEMENT EXPECTED...ESPECIALLY FROM THE CAPE
NORTHWARD. MOS POPS VARY FOR TOMORROW WITH GFS/MAV GUIDANCE THE
DRIER OUTLIER FROM THE NAM AND ECMWF MOS. LOOKS LIKE THERE SHOULD BE
SUFFICIENT MOISTURE AND INSTABILITY FOR ISO-SCT SHOWER/STORM
COVERAGE IN THE AFT SO HAVE LEANED TOWARD THE LATTER GUIDANCE WITH
POPS RANGING FROM 30-40 PERCENT. BEST CHANCE FOR BOUNDARY COLLISIONS
AND ANY STRONGER STORMS WILL BE OVER THE INTERIOR AND TOWARD THE
BREVARD/VOLUSIA COASTS. HIGHS FORECAST IN THE LOW 90S ACROSS THE
COAST TO MID 90S OVER THE INTERIOR.

PREVIOUS EXTENDED DISCUSSION...

THU-FRI...SUBTROPICAL RIDGE IS SHOWN BY GFS DRIFTING NWD TO A
POSITION NR CENTRAL FL BY THU A LIGHTER WIND REGIME WL LEAD TO MORE
TYPICAL COVERAGE OF AFTERNOON STORMS...SLIGHTLY DELAYED FOR ONSET
DUE TO THE NEED FOR SFC HEATING AND BOUNDARY CONDITIONS TO INITIATE
ACTIVITY. THE WEAK WIND PROFILE THU-FRI WL FAVOR INTERIOR SECTIONS
GENERALLY FOR BEST COVERAGE.

SAT-MON...THE AXIS OF THE SUBTROPICAL RIDGE IS SHOWN DRIFTING NEAR
TO JUST NORTH OF THE AREA DURING THE WEEKEND. MARINE BASED SHOWERS
ARE POSSIBLE BY SAT NIGHT/SUN WITH AT LEAST SEASONALLY TO LOW END
SCT COVERAGE AREAWIDE A GOOD BET INTO EARLY NEXT WEEK.

&&

.AVIATION...STORM COVERAGE HAS REMAINED LIMITED DUE TO DRIER AIR
ALOFT ACROSS THE REGION. MAY STILL SEE ISO-SCT SHRA/TSRA MAINLY
TOWARD THE COAST INTO LATE AFT/EARLY EVE...ESPECIALLY WITH BOUNDARY
COLLISIONS FROM KVRB-KSUA. ANY CONVECTION THAT FORMS WILL DIMINISH
AND PUSH OFFSHORE BY LATE EVE WITH RAIN CHANCES ENDING ACROSS THE
AREA.

ISO/SCT AFT SHRA/TSRA FORECAST FOR TOMORROW AFT. SEA BREEZE SHOULD
BE ABLE TO FORM ALONG MUCH OF THE COAST DUE TO A WEAKER OFFSHORE
FLOW. GREATEST STORM COVERAGE EXPECTED WITH ANY BOUNDARY
INTERACTIONS ACROSS THE INTERIOR AND TOWARD THE VOLUSIA/BREVARD
COASTS LATER IN THE DAY.

&&

.MARINE...

TONIGHT...RIDGE AXIS SOUTH OF THE AREA WILL MAINTAIN WINDS OUT OF
THE SOUTHWEST OVERNIGHT UP TO 10-15 KNOTS WITH SEAS RANGING FROM 1-3
FEET. A FEW OFFSHORE MOVING STORMS WILL CONTINUE TO BE POSSIBLE INTO
THE EVENING HOURS.

WED-SAT...(PREVIOUS DISCUSSION) THE RIDGE AXIS SITUATED JUST S OF
THE AREA THROUGH MIDWEEK WL PROVIDE FAVORABLE MARINE CONDS DUE TO
WLY COMPONENT WITH A LIMITED SEA BREEZE POTENTIAL. STORMS MOVING
OFFSHORE FROM THE MAINLAND WL PRODUCE LOCALLY HIGHER WINDS AND SEAS
IN THE AFTERNOON TO EARLY EVENING HOURS WED-THU.

&&

.PRELIMINARY POINT TEMPS/POPS...
DAB  72  93  74  93 /  20  40  20  40
MCO  74  95  75  94 /  10  40  20  50
MLB  73  92  75  92 /  20  40  30  30
VRB  72  93  75  92 /  30  30  30  30
LEE  75  94  76  94 /  10  40  20  40
SFB  74  95  76  94 /  20  40  20  40
ORL  75  95  77  94 /  10  40  20  50
FPR  71  93  74  92 /  30  30  30  30

&&

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

FORECAST GRIDS...WEITLICH/ULRICH
AVIATION...WEITLICH
IMPACT WEATHER/RADAR....VOLKMER

Hazardous weather outlook, Jun 30, 9:47 AM EDT, 11 hours 21 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MELBOURNE FL
947 AM EDT TUE JUN 30 2015

AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141-
144-147-302300-
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-
947 AM EDT TUE JUN 30 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA.

.DAY ONE...TODAY AND TONIGHT.

.THUNDERSTORM IMPACT...
WESTERLY MID LAYER WINDS WILL ALLOW SCATTERED STORMS TO MOVE EAST
FROM THE INTERIOR TOWARD THE EAST COAST IN THE AFTERNOON. THE EAST
COAST SEA BREEZE WILL ALSO DEVELOP AND MOVE SLOWLY INLAND SOUTH OF
CAPE CANAVERAL WHICH MAY ALLOW A FEW STORMS TO BECOME STRONG NEAR
THE COAST IN THE MID TO LATE AFTERNOON. STRONGER STORMS TODAY MAY
PRODUCE WIND GUSTS TO 50 MPH...LOCALLY HEAVY RAIN AND FREQUENT
LIGHTNING.

.MARINE THUNDERSTORM GUST IMPACT...
A FEW STRONGER STORMS APPROACHING THE INTRACOASTAL AND NEAR SHORE
ATLANTIC WATERS THIS AFTERNOON WILL BE CAPABLE OF PRODUCING WIND
GUSTS IN EXCESS OF 40 KNOTS. A FEW STRONGER STORMS OVER THE
INTERIOR MAY ALSO PRODUCE STRONG AND GUSTY WINDS. BOATERS ARE
URGED TO KEEP AN EYE TO THE WESTERN SKIES FOR APPROACHING WEATHER
AND TO SEEK SAFE HARBOR BEFORE THE STORMS ARE IN YOUR AREA.

.RIP CURRENT IMPACT...
WEATHER AND OCEAN CONDITIONS WILL PRODUCE A LOW TO MODERATE RISK
OF RIP CURRENTS AT THE BEACHES OF EAST CENTRAL FLORIDA THIS
AFTERNOON. ALWAYS SWIM WITHIN SIGHT OF A LIFEGUARD.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.
SCATTERED LIGHTNING STORMS ARE FORECAST EACH AFTERNOON THROUGH
THE HOLIDAY WEEKEND...WITH THE POTENTIAL FOR THUNDERSTORMS TO MOVE
OFFSHORE DURING THE LATE AFTERNOONS AND EARLY EVENINGS INTO MID
WEEK. THE PRIMARY THREATS WILL BE FREQUENT CLOUD TO GROUND
LIGHTNING AND GUSTY DOWNBURST WINDS.

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

VOLKMER/WIMMER

In the hours before

Special weather statement, Jun 30, 6:52 PM EDT, 2 hours 16 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
652 PM EDT TUE JUN 30 2015

FLZ053-302345-
OSCEOLA FL-
652 PM EDT TUE JUN 30 2015

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL OSCEOLA COUNTY UNTIL 745
PM EDT...

AT 649 PM EDT...DOPPLER RADAR WAS TRACKING CLUSTER OF STRONG
THUNDERSTORMS OVER AND EAST OF LAKE KISSIMMEE...MOVING EASTWARD
AT 15 KNOTS.

WINDS OF 40 TO 45 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
LAKE KISSIMMEE...LAKE MARIAN...FOREVER FLORIDA AND KENANSVILLE.

THESE STORMS WILL ALSO IMPACT MOTORISTS ON THE FLORIDA TURNPIKE AND
CANOE CREEK ROAD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE PRIMARY THREATS WILL BE CLOUD TO GROUND LIGHTNING AND STRONG WIND
GUSTS...WHICH CAN CAUSE UNSECURED OBJECTS TO BLOW AROUND...SNAP TREE
LIMBS...CAUSE POWER OUTAGES OR CAPSIZE SMALL BOATS. HEAVY RAINFALL
WILL TEMPORARILY REDUCE VISIBILITY. SEEK SHELTER INDOORS UNTIL THE
STORM PASSES.

IF ON OR NEAR LAKE KISSIMMEE OR LAKE MARIAN...GET OUT OF THE WATER
AND MOVE INDOORS OR INSIDE A VEHICLE. REMEMBER...LIGHTNING CAN
STRIKE OUT TO 15 MILES FROM THE PARENT THUNDERSTORM. IF YOU CAN HEAR
THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. MOVE TO
SAFE SHELTER NOW. DO NOT BE CAUGHT ON THE WATER IN A THUNDERSTORM.

HEAVY RAINFALL IS ALSO OCCURRING WITH THIS STORM...WHICH WILL REDUCE
VISIBILITY AND MAY LEAD TO TEMPORARY FLOODING OF LOW LYING AND POOR
DRAINAGE AREAS. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE SEVERAL MILES AWAY FROM A THUNDERSTORM. SEEK
SHELTER INSIDE A BUILDING OR VEHICLE. OPEN SHELTERS FOUND IN PARKS...
ON BEACHES OR GOLF COURSES OFFER NO PROTECTION FROM THE DANGERS OF
LIGHTNING.

&&

LAT...LON 2795 8134 2807 8131 2808 8093 2775 8104
      2783 8122 2785 8124 2785 8126 2787 8130
      2789 8130 2790 8131 2792 8131 2794 8135
TIME...MOT...LOC 2249Z 287DEG 12KT 2796 8125

CRISTALDI

Special weather statement, Jun 30, 7:24 PM EDT, 1 hour 44 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
724 PM EDT TUE JUN 30 2015

FLZ047-053-010015-
OSCEOLA FL-SOUTHERN BREVARD COUNTY FL-
724 PM EDT TUE JUN 30 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN BREVARD AND EAST
CENTRAL OSCEOLA COUNTIES UNTIL 815 PM EDT...

AT 723 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
KENANSVILLE...MOVING EAST AT 10 MPH.

WINDS OF 40 TO 45 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
KENANSVILLE...WESTERN PALM BAY

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE PRIMARY THREATS WILL BE CLOUD TO GROUND LIGHTNING AND STRONG WIND
GUSTS...WHICH CAN CAUSE UNSECURED OBJECTS TO BLOW AROUND...SNAP TREE
LIMBS...CAUSE POWER OUTAGES OR CAPSIZE SMALL BOATS. HEAVY RAINFALL
WILL TEMPORARILY REDUCE VISIBILITY. SEEK SHELTER INDOORS UNTIL THE
STORM PASSES.

HEAVY RAINFALL IS ALSO OCCURRING WITH THIS STORM...WHICH WILL REDUCE
VISIBILITY AND MAY LEAD TO TEMPORARY FLOODING OF LOW LYING AND POOR
DRAINAGE AREAS. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 2782 8075 2782 8081 2786 8100 2808 8093
      2808 8071
TIME...MOT...LOC 2323Z 276DEG 6KT 2796 8093

CRISTALDI

Special weather statement, Jun 30, 7:42 PM EDT, 1 hour 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
742 PM EDT TUE JUN 30 2015

FLZ047-053-054-058-059-010045-
OSCEOLA FL-SOUTHERN BREVARD COUNTY FL-OKEECHOBEE FL-ST. LUCIE FL-
INDIAN RIVER FL-
742 PM EDT TUE JUN 30 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN BREVARD...SOUTHEASTERN
OSCEOLA...WESTERN INDIAN RIVER...NORTHEASTERN OKEECHOBEE AND
NORTHWESTERN SAINT LUCIE COUNTIES UNTIL 845 PM EDT...

AT 738 PM EDT...DOPPLER RADAR WAS TRACKING AN IMMINENT COLLISION
BETWEEN A LARGE THUNDERSTORM OUTFLOW BOUNDARY AND THE EAST COAST SEA
BREEZE. RAPID DEVELOPMENT OF STRONG STORMS WILL BE POSSIBLE IN THE
ADVISORY AREA. WIND GUSTS OF 45 TO 55 MPH WILL BE POSSIBLE WITH SOME
OF THE STORMS THAT FORM.

LOCATIONS IMPACTED INCLUDE...
PALM BAY...MELBOURNE...SEBASTIAN...FELLSMERE AND MALABAR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE PRIMARY THREATS WILL BE CLOUD TO GROUND LIGHTNING AND STRONG WIND
GUSTS...WHICH CAN CAUSE UNSECURED OBJECTS TO BLOW AROUND...SNAP TREE
LIMBS...CAUSE POWER OUTAGES OR CAPSIZE SMALL BOATS. HEAVY RAINFALL
WILL TEMPORARILY REDUCE VISIBILITY. SEEK SHELTER INDOORS UNTIL THE
STORMS END.

IF ON OR NEAR BLUE CYPRESS LAKE OR THE STICK MARSH...GET OUT OF THE
WATER AND MOVE INDOORS OR INSIDE A VEHICLE. REMEMBER...LIGHTNING CAN
STRIKE OUT TO 15 MILES FROM THE PARENT THUNDERSTORM. IF YOU CAN HEAR
THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. MOVE TO
SAFE SHELTER NOW. DO NOT BE CAUGHT ON THE WATER IN A THUNDERSTORM.

HEAVY RAINFALL IS LIKELY WITH STORMS THAT DEVELOP. THIS MAY REDUCE
VISIBILITY AND MAY LEAD TO TEMPORARY FLOODING OF LOW LYING AND POOR
DRAINAGE AREAS. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING MAY DEVELOP WITH THESE STORMS.
LIGHTNING CAN STRIKE SEVERAL MILES AWAY FROM A THUNDERSTORM. SEEK
SHELTER INSIDE A BUILDING OR VEHICLE. OPEN SHELTERS FOUND IN
PARKS... ON BEACHES OR GOLF COURSES OFFER NO PROTECTION FROM THE
DANGERS OF LIGHTNING.

THESE STORMS MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 2778 8042 2778 8043 2777 8043 2777 8044
      2748 8056 2751 8079 2762 8107 2786 8100
      2781 8075 2808 8071 2808 8060 2794 8053
      2794 8051 2795 8051 2798 8053 2799 8052
      2808 8058 2808 8056 2780 8042
TIME...MOT...LOC 2338Z 265DEG 48KT 2805 8059 2776 8067 2758 8074

CRISTALDI

Special weather statement, Jun 30, 8:47 PM EDT, 21 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
847 PM EDT TUE JUN 30 2015

FLZ054-058-059-010145-
OKEECHOBEE FL-ST. LUCIE FL-INDIAN RIVER FL-
847 PM EDT TUE JUN 30 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ST. LUCIE...
SOUTHWESTERN INDIAN RIVER AND OKEECHOBEE COUNTIES UNTIL 945 PM EDT...

AT 845 PM EDT...DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS
ALONG A LINE EXTENDING FROM NEAR BLUE CYPRESS LAKE TO FORT DRUM
TO BASINGER...AND MOVING EAST-SOUTHEAST AT 20 MPH.

WIND GUSTS OF 45 TO 55 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
OKEECHOBEE...BASINGER AND FORT DRUM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE PRIMARY THREATS WILL BE CLOUD TO GROUND LIGHTNING AND STRONG WIND
GUSTS...WHICH CAN CAUSE UNSECURED OBJECTS TO BLOW AROUND...SNAP TREE
LIMBS...CAUSE POWER OUTAGES OR CAPSIZE SMALL BOATS. HEAVY RAINFALL
WILL TEMPORARILY REDUCE VISIBILITY. SEEK SHELTER INDOORS UNTIL THE
STORM PASSES.

BOATERS SHOULD BE AWARE THAT STRONG WIND GUSTS SOMETIMES OCCUR WELL
AWAY FROM THE HEAVY RAIN AND LIGHTNING ASSOCIATED WITH STORMS.

HEAVY RAINFALL IS ALSO OCCURRING WITH THESE STORMS...WHICH WILL
REDUCE VISIBILITY AND MAY LEAD TO TEMPORARY FLOODING OF LOW LYING AND
POOR DRAINAGE AREAS. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 2717 8088 2717 8091 2719 8091 2722 8095
      2723 8099 2730 8100 2730 8103 2736 8103
      2738 8107 2739 8112 2742 8114 2744 8114
      2748 8118 2769 8067 2741 8038 2720 8077
      2721 8079 2720 8083 2714 8087
TIME...MOT...LOC 0045Z 254DEG 16KT 2761 8063 2741 8110

CRISTALDI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 8:37 PM EDT	Severe Thunderstorm Warning	MLB	Indian River, Saint Lucie	23 min
Jun 30, 8:42 PM EDT	Special Marine Warning	MLB		63 min
Jun 30, 8:47 PM EDT	Special Weather Statement	MLB	Okeechobee, Saint Lucie	58 min
Jun 30, 9:46 PM EDT	Special Marine Warning	MLB		59 min
Jun 30, 9:47 PM EDT	Severe Thunderstorm Warning	MLB	Martin, Okeechobee, Saint Lucie	43 min
Jun 30, 10:38 PM EDT	Special Weather Statement	MLB	Martin	52 min
Jun 30, 10:46 PM EDT	Special Marine Warning	MLB		89 min
Jul 1, 11:24 AM EDT	Special Weather Statement	MLB	Lake	66 min
Jul 1, 4:35 PM EDT	Special Weather Statement	MLB	Seminole	40 min
Jul 1, 4:39 PM EDT	Special Marine Warning	MLB		96 min
Jul 1, 4:42 PM EDT	Special Weather Statement	MLB	Osceola	63 min
Jul 1, 5:29 PM EDT	Severe Thunderstorm Warning	MLB	Osceola	34 min
Jul 1, 6:46 PM EDT	Special Weather Statement	MLB	Indian River	59 min

Nearby

Severe Thunderstorm Warnings in Florida, 2015 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.