Thunderstorms developed along the Treasure Coast in an unseasonably warm and unstable airmass. A storm over Jensen Beach became severe and produced quarter-sized hail.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS MLB wrote it up.
Thunderstorms developed along the Treasure Coast in an unseasonably warm and unstable airmass. A storm over Jensen Beach became severe and produced quarter-sized hail.
The local office's own words before the first event, 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 the first event at Apr 20, 9:35 AM EST, 2 hours 53 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MELBOURNE FL 1035 AM EDT MON APR 20 2015 .DISCUSSION... ...STRONG TO ISOLATED SEVERE STORMS POSSIBLE THIS AFTERNOON AND EVENING... LATEST RADAR AND LIGHTNING IMAGERY SHOWS SQUALL LINE OVER THE NRN AND CENTRAL GULF SHIFTING EASTWARD OUT AHEAD OF WEAK FRONT MOVING INTO THE SOUTHEAST STATES. TRACK ESTIMATES HAS THIS LINE NEARING THE WEST CENTRAL FL COAST BY EARLY THIS AFT. MID/HIGH LEVEL DEBRIS CLOUDS FROM THIS CONVECTION ALREADY MOVING ACROSS THE REGION WHICH WILL LIMIT DAYTIME HEATING TODAY. HOWEVER SHOULD STILL SEE ENOUGH FILTERED SUNSHINE FOR HIGHS TO REACH THE MID TO UPPER 80S INTO EARLY/MID AFT. DECENT HEATING...DEEP MOISTURE AND MARGINALLY FAVORABLE DYNAMIC SUPPORT FROM SUBTROPICAL JET MAY ALLOW THIS LINE TO MAINTAIN ENOUGH STRENGTH TO HOLD TOGETHER AS IT INITIALLY MOVES ONSHORE. THE POTENTIAL FOR STRONG TO ISO SEVERE WIND GUSTS WILL ACCOMPANY THIS CONVECTIVE BAND AS IT MOVES TOWARD LAKE COUNTY AND I- 4 CORRIDOR. STORM PREDICTION CENTER HAS PLACED THIS REGION UNDER A SLIGHT RISK IN THE LATEST DAY 1 UPDATE. IN ADDITION TO WIND...HAIL UP TO QUARTER SIZE WILL ALSO BE A CONCERN AS MORNING SOUNDINGS SHOW COOLER TEMPS ALOFT WITH -10 TO -12C AT 500MB. IN ADDITION TO THIS LINE...HRRR/WRF MODELS SHOW ADDITIONAL SCT-NMRS SHOWERS AND STORMS DEVELOPING OUT AHEAD OF THIS SYSTEM AND PUSHING E- NE ACROSS THE AREA INTO THE AFT HOURS. THESE STORMS COULD ALSO BRING WITH THEM THREAT FOR STRONG WIND GUSTS AND SMALL HAIL...ESPECIALLY WITH BOUNDARY INTERACTIONS TOWARD THE COAST IF THE EAST COAST SEA BREEZE IS ABLE TO FORM. THEREFORE HIGH POPS UP TO 70-80 PERCENT TODAY STILL LOOK GOOD WITH NO MAJOR CHANGES TO THE FORECAST PLANNED. && .AVIATION...VFR THROUGH THE MORNING. INCREASING COVERAGE OF SHRA/TSRA INTO THE AFT WITH APPROACHING SQUALL LINE OVER THE GULF AND ADDITIONAL SCT-NMRS CONVECTION THAT FORMS OUT AHEAD OF THIS LINE THAT BOTH THE WRF AND HRRR MODELS INDICATE. STRONG TO ISO SEVERE WIND GUSTS AND HAIL POSSIBLE WITH ANY STORMS TODAY. TEMPO IFR/MVFR CONDS WILL OCCUR WITH ANY CONVECTION TODAY WITH BEST TIMEFRAME FOR THIS ACTIVITY BTW 18-00Z. && .MARINE... TODAY-TONIGHT...(PREVIOUS DISCUSSION) SOUTH TO SOUTHWEST WINDS AROUND 10 KNOTS NEARSHORE AND 10 TO 15 KNOTS OFFSHORE. SEAS 2 TO 3 FEET NEARSHORE AND 3 TO 4 FEET WELL OFFSHORE. SCATTERED TO NUMEROUS AFTERNOON WEST TO EAST MOVING SHOWERS AND STORMS. FAST MOVING...20 TO 30 MPH...STORMS AGAIN. BOATERS SHOULD KEEP AN EYE TO THE WEST FOR FAST APPROACHING STORMS. && .PRELIMINARY POINT TEMPS/POPS... DAB 85 67 81 62 / 80 50 20 10 MCO 86 67 86 68 / 80 50 30 20 MLB 87 68 82 70 / 80 50 40 20 VRB 88 69 82 69 / 70 50 40 20 LEE 85 67 84 67 / 80 40 20 20 SFB 86 67 85 65 / 80 50 20 20 ORL 86 68 85 68 / 80 50 30 20 FPR 88 69 83 69 / 70 50 50 30 && .MLB WATCHES/WARNINGS/ADVISORIES... FL...NONE. AM...NONE. && WEITLICH/KELLY
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE MELBOURNE FL 1250 PM EDT MON APR 20 2015 AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141- 144-147-210000- 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- 1250 PM EDT MON APR 20 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA. .DAY ONE...THIS AFTERNOON AND TONIGHT. .THUNDERSTORM IMPACT... A VERY MOIST ATMOSPHERE COMBINED WITH AN APPROACHING COLD FRONT...TEAMED WITH COOLER TEMPERATURES IN THE MIDDLE LAYER OF THE ATMOSPHERE AND A STRONG UPPER LEVEL JET PROVIDING LIFT...WILL RESULT IN SCATTERED TO NUMEROUS LIGHTNING STORMS THAT WILL LAST THROUGH SUNSET. SHOWERS AND STORMS ARE EXPECTED TO INCREASE IN COVERAGE AS THEY WORK THEIR WAY EAST NORTHEAST AT 30 TO 40 MPH. SOME STORMS ARE EXPECTED TO BECOME SEVERE PRODUCING FREQUENT LIGHTNING STRIKES...DAMAGING WINDS NEAR 60 MPH...HAIL...AND LOCALLY HEAVY RAIN. .RIP CURRENT IMPACT... LONG PERIOD OCEAN SWELLS WILL PRODUCE A LOW TO MODERATE RISK OF RIP CURRENTS ESPECIALLY DURING THE AFTERNOON WHEN THE OUTGOING TIDES ARE AT THEIR STRONGEST. LIFE GUARDS PERFORMED SEVERAL RESCUES AT AREA BEACHES THIS PAST WEEKEND. ASK THE LIFE GUARDS ABOUT SURF CONDITIONS AND SWIM NEAR THEM. .MARINE THUNDERSTORM GUST IMPACT... LIGHTNING STORMS WILL MOVE TOWARD THE EAST NORTHEAST AT 30 TO 35 KNOTS WHICH WILL BRING THEM ACROSS THE INTRACOASTAL AND NEAR SHORE ATLANTIC WATERS IN THE LATE AFTERNOON AND EARLY EVENING. SOME OF THE STORMS WILL CONTAIN STRONG WIND GUSTS OF 35 TO 45 KNOTS AND FREQUENT LIGHTNING. BOATERS ON INLAND LAKES...RIVERS AND THE INTRACOASTAL AND NEARSHORE WATERS SHOULD KEEP AN EYE TO THE WEST FOR RAPIDLY APPROACHING STORMS AND IMMEDIATELY SEEK SHELTER. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. LIGHTNING WILL BE THE MAIN HAZARD. A COOL FRONT WILL SETTLE ACROSS SOUTH FLORIDA TUESDAY AND WEDNESDAY AS HIGHER PRESSURE BUILDS IN FOR CENTRAL FLORIDA. RAIN CHANCES WILL BE NOTABLY LESS BUT STILL REMAIN IN THE FORECAST GIVEN DAYTIME HEATING AND RESIDUAL MOISTURE. SCATTERED SHOWERS AND STORMS WILL ALSO BE IN THE FORECAST EACH DAY FOR LATE IN THE WEEK AND INTO THE WEEKEND. THE NEXT FRONT MAY APPROACH OVER THE THE WEEKEND. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE REQUESTED TO MONITOR THE WEATHER AND SELF ACTIVATE IF NEEDED. KELLY/WIMMER
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
1227 PM EDT MON APR 20 2015
FLZ058-059-201715-
OKEECHOBEE FL-ST. LUCIE FL-
1227 PM EDT MON APR 20 2015
...SIGNIFICANT WEATHER ADVISORY FOR WESTERN ST. LUCIE AND
SOUTHEASTERN OKEECHOBEE COUNTIES UNTIL 115 PM EDT...
AT 1226 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
NEAR OKEECHOBEE...MOVING NORTHEAST AT 35 MPH.
WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM.
LOCATIONS IMPACTED INCLUDE...
TREASURE ISLAND...OKEECHOBEE...TAYLOR CREEK...FOUR SEASONS ESTATES
AND CARLTON.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.
FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.
&&
LAT...LON 2717 8088 2716 8089 2717 8091 2719 8091
2720 8094 2722 8095 2722 8097 2723 8099
2725 8098 2725 8099 2756 8062 2756 8060
2733 8039 2720 8066 2721 8068 2719 8068
2717 8073 2721 8079 2720 8083 2714 8087
TIME...MOT...LOC 1626Z 232DEG 32KT 2722 8088
KELLYSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
1242 PM EDT MON APR 20 2015
FLZ059-201745-
ST. LUCIE FL-
1242 PM EDT MON APR 20 2015
...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL ST. LUCIE COUNTY UNTIL
145 PM EDT...
AT 1242 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
OVER SAINT LUCIE WEST...OR OVER PORT SAINT LUCIE...MOVING NORTHEAST
AT 35 MPH.
WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM.
LOCATIONS IMPACTED INCLUDE...
PORT SAINT LUCIE...WALTON...FORT PIERCE...WHITE CITY AND FORT PIERCE
INLET.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.
&&
LAT...LON 2727 8021 2731 8023 2734 8027 2728 8024
2728 8022 2727 8024 2726 8023 2726 8028
2723 8029 2725 8032 2721 8030 2721 8040
2738 8053 2753 8031 2747 8029 2746 8032
TIME...MOT...LOC 1642Z 232DEG 32KT 2731 8038
KELLYThe Melbourne radar (KMLB), 106 km away, was scanning. The volume nearest the first event began at 17:28 UTC.
1 hail. Local standard time, as filed.
The Martin County Sheriff's Office relayed a report of quarter-sized hail along the 9200 Block of South Ocean Drive.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2015Every state in 2015This day in weather historyWarnings in Florida, April 2015
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 561061.