A sea breeze collision produced a severe thunderstorm over east central Volusia county during the late afternoon. Several reports of quarter to half dollar sized hail were received from Port Orange to New Smyrna Beach.
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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.
A sea breeze collision produced a severe thunderstorm over east central Volusia county during the late afternoon. Several reports of quarter to half dollar sized hail were received from Port Orange to New Smyrna Beach.
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 Jun 1, 9:00 AM EST, 5 hours 38 minutes earlier.
Area Forecast Discussion National Weather Service Melbourne FL 1000 AM EDT Thu Jun 1 2017 .DISCUSSION... Bermuda ridge axis bisecting the peninsula from the Treasure Coast to the Big Bend generating a light srly flow thru the H100-H70 lyr...S/SE arnd 10KTS south of U.S. Hwy 192, S/SW arnd 5KTS to the north. RAP40 shows a drier air over the west half of the peninsula with a pocket of H100-H70 RH arnd 60pct west of Lake-O...this is backed up by the KTBW RAOB that shows relatively dry low/mid lvl air marked by dewpoint depressions btwn 5-10C thru the H100-H50 lyr. Higher moisture over the east peninsula/Bahama bank with H100-H70 mean RH btwn 70-80pct...H100-H70 lyr saturated at KMFL. No sig low/mid lvl capping to speak of on any sounding...though lapse rates of 5.5-6.0C/KM do not suggest explosive instability. H85-H50 vort fields are pretty flat, as are the omega/divergence fields. High clouds have thinned a bit, and with light prevailing light srly flow, should see temps reach their convective triggers (M/U80s) by midday. Position of the Bermuda ridge will allow both east/west coast sea breezes to dvlp by midday...sufficient moisture and instability in place to allow isold/sct tsras form on the east coast sea breeze as it pushes inland. Once again, highest precip coverage over the interior counties as the sea breezes merge, while westerly flow aloft may give the coastal counties some blowback by early evng. Slower moving storms will contribute to local heavy rainfall. A few strong storms will be possible again with frequent lightning strikes, gusty downburst winds up to 50 mph and small hail. && .AVIATION...Thru 02/12Z. Sfc Winds: Coastal sites...thru 01/16Z S/SE bcmg E/SE 8-12KTS...btwn 02/00Z- 02/03Z...bcmg S/SE 4-7KTS...btwn 02/04Z-02/06Z bcmg vrbl AOB 3KTS. Interior sites...thru 01/18Z S/SW 6-10KTS...btwn 01/18Z-01/21Z bcmg E/SE 7-11KTS. btwn 02/03Z-03/06Z...bcmg vrbl AOB 3KTS. WX/Vsbys/Cigs: Coastal sites...btwn 01/18Z-01/22Z sct MVFR shras/isold IFR tsras...btwn 02/00Z-02/03Z N of KMLB chc IFR tsras. Interior sites...btwn 01/19Z-02/02Z sct-nmrs MVFR shras/sct IFR tsras...btwn 01/21Z-01/24Z slgt chc +TSRA with sfc G35KTS. && .MARINE... High pressure ridge bisecting the lcl Atlc will generate a light to gentle S/SW breeze thru midday, bcmg SE near the coast by early aftn as the east coast sea breeze pushes inland. Seas AOB 2FT. There will be a chance for storms to push off the east coast late aftn into early evng. && .MLB WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. && Short Term/Aviation...Bragaw Impact WX/Radar Ops...Spratt
Hazardous Weather Outlook National Weather Service Melbourne FL 1005 AM EDT Thu Jun 1 2017 AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141- 144-147-020500- 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- 1005 AM EDT Thu Jun 1 2017 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA. .DAY ONE...TODAY AND TONIGHT. .THUNDERSTORM IMPACT... Sufficient moisture and instability should produce scattered lightning storms along the east and west coast sea breezes this afternoon as they push inland across the coastal counties. Then a collision should occur late in the day between 5 and 8 pm over Lake county and adjacent portions of inland Volusia, Seminole, western Orange and northwest Osceola counties. Conditions are favorable for a few strong storms containing frequent lightning strikes, downburst winds up to 50 mph and small hail. Very heavy rain accumulating 2 to 3 inches in a short period of time may cause temporary flooding especially in urban areas. .MARINE THUNDERSTORM GUST IMPACT... Scattered lightning storms over land may push back across the intracoastal waters and nearshore Atlantic this afternoon and evening, mainly north of Sebastian Inlet. Gusty outflow winds near 35 knots will be possible along with dangerous lightning strikes. .FIRE WEATHER IMPACT... While a few areas saw heavy rain yesterday, continued dry vegetation in many areas will produce a moderate to high danger of wildfire spread. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. A rather cloudy and wet pattern is expected this weekend and early next week with scattered to numerous afternoon and evening lightning storms. The primary hazards will be frequent lightning strikes, gusty downburst winds and heavy rainfall on both land and water. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today. Kelly/Johnson
Special Weather Statement
National Weather Service Melbourne FL
311 PM EDT THU JUN 1 2017
FLZ144-012000-
Southern Lake County FL-
311 PM EDT THU JUN 1 2017
...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL LAKE COUNTY UNTIL
400 PM EDT...
At 311 PM EDT, Doppler radar was tracking a strong thunderstorm near
Groveland. This storm was nearly stationary.
Wind gusts up to 50 mph will be possible with this storm.
Locations impacted include...
Tavares, Groveland, Mascotte, Howey-In-the-hills and Lake Harris.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 2878 8195 2878 8166 2835 8166 2835 8179
2836 8179 2836 8186 2835 8186 2835 8196
TIME...MOT...LOC 1911Z 339DEG 1KT 2862 8182
SedlockSpecial Weather Statement
National Weather Service Melbourne FL
323 PM EDT THU JUN 1 2017
FLZ141-012015-
Coastal Volusia County FL-
323 PM EDT THU JUN 1 2017
...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL VOLUSIA COUNTY UNTIL
415 PM EDT...
At 322 PM EDT, Doppler radar was tracking a strong thunderstorm near
Port Orange, moving southeast at 10 mph.
Dime size hail and wind gusts of 50 to 55 mph will be possible with
this storm.
Locations impacted include...
Daytona Beach, Port Orange, New Smyrna Beach, South Daytona and
Daytona Beach Shores.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 2912 8091 2905 8087 2895 8098 2906 8113
2924 8107
TIME...MOT...LOC 1922Z 335DEG 9KT 2913 8103
SedlockThe Melbourne radar (KMLB), 115 km away, was scanning. The volume nearest the first event began at 19:37 UTC.
3 hail. Local standard time, as filed.
A trained spotter reported nickel sized hail in Port Orange on Williams Road at 1438LST. The same spotter reported quarter to half dollar sized hail in New Smyrna Beach at 1451LST, from the same storm.
Multiple reports were received via social media of half dollar sized hail in Port Orange as a severe thunderstorm moved through the area. Duration unknown.
A New Smyrna Beach resident reported quarter sized hail during a strong thunderstorm, per social media account. Duration unknown.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2017Every state in 2017This day in weather historyWarnings in Florida, June 2017
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: 694917, 694920, 694918.