Afternoon sea breeze collisions produced a strong thunderstorm in western Martin County that produced very minimal damage as it moved west across the northeastern shore of Lake Okeechobee.
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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.
Afternoon sea breeze collisions produced a strong thunderstorm in western Martin County that produced very minimal damage as it moved west across the northeastern shore of Lake Okeechobee.
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 May 31, 2:43 PM EST, 3 hours 17 minutes earlier.
Area Forecast Discussion National Weather Service Melbourne FL 343 PM EDT Wed May 31 2017 .DISCUSSION... Rest of This Afternoon and Tonight...Convection along the east coast sea breeze was later developing than yesterday south of Cape Canaveral. This has left most of the coastal sections dry. Weak moisture convergence north of low level ridge axis was producing more congested cumulus from the Cape northward and inland. Expect scattered coverage of storms over interior sections when boundary interactions increase late this afternoon and into the evening. A few strong storms with frequent lightning strikes, gusty winds 40-50 mph and 2-3 inch downpours will be possible. There is a small chance for push back to the coast as the Canaveral wind profilers showed westerly winds 10-15 knots in the steering levels. Thursday...High pressure ridge will remain prominent over the western Atlantic with an axis extending to central Florida. Flow aloft will remain westerly and looks unperturbed, while steering level flow is shown weakening slightly. The GFS shows precipitable water starting off 1.6 to 1.8 inches and 500 mb temps -8 to -9 celsius, not a lot different than today. These parameters point to scattered coverage, but MOS POPs inland are in the likely range. There may be some moist air advection occurring through the day though, so do not plan to change our current forecast which has 40-50% coastal, and 60% interior POPs. Friday-Wednesday...Models in good agreement that moisture levels will continue to support scattered to at times numerous storms each afternoon. Axis of subtropical high pressure ridge early in the period will extend into central Florida, then weakening and a shunting south will occur early next week as a frontal trough drops into the southeast states. Weak steering level winds late in the week and over the weekend will continue to favor the highest coverage of afternoon and evening storms across interior sections. As the ridge axis gets suppressed to the south early next week, coastal sections should get back into a higher coverage of the diurnal convection. The models suggest a slug of tropical moisture advecting in from the Gulf of Mexico, so well above normal POPs are possible early-mid next week. && .AVIATION...Coverage so far of showers/storms has been less than 24 hours ago. Still expect numerous boundary interactions to occur late this afternoon-early evening over the interior, which will ramp up the coverage/intensity of storms. Latest indications are that the greatest chance for strong storms will at KISM-KMCO- KSFB. The models show higher moisture on Thu, so would expect convection to initiate a little sooner than today, with scattered to numerous showers/storms occurring over the interior in the afternoon. && .MARINE... Tonight...No wind or sea problems with south winds around 10 knots and seas 2 feet or less. There's a low chance for storms pushing off the coast through evening, especially north of Sebastian Inlet. Also expect isolated late night storms over the Gulf Stream. Thursday-Monday...High pressure will remain near or over the waters, supporting wind speeds around 10 knots. Seas expected to be 2-3 feet most of the time. Scattered storms will continue each afternoon, mainly across inland areas. There is a chance for offshore moving storms on Mon. Additionally, more night/morning showers and storms are expected especially in the Gulf Stream. && .PRELIMINARY POINT TEMPS/POPS... DAB 72 89 74 85 / 20 40 40 50 MCO 73 92 73 87 / 30 60 40 60 MLB 75 89 76 85 / 30 40 40 50 VRB 76 89 75 85 / 20 30 40 50 LEE 74 93 74 87 / 20 60 40 60 SFB 73 93 74 87 / 30 60 40 60 ORL 73 92 74 87 / 30 60 40 60 FPR 75 90 75 86 / 20 30 40 50 && .MLB WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. && SHORT TERM/LONG TERM...Lascody IMPACT WX/AVIATION...Bragaw & Smith
Hazardous Weather Outlook National Weather Service Melbourne FL 551 AM EDT Wed May 31 2017 AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141- 144-147-312300- 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- 551 AM EDT Wed May 31 2017 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA. .DAY ONE...TODAY AND TONIGHT. .THUNDERSTORM IMPACT... Increasing moisture and additional instability should produce a slightly higher coverage of storms this afternoon and early evening. Scattered lightning storms should develop along the east and west coast sea breezes early this afternoon as they push inland across the coastal counties. Then a collision should occur late in the day between 5 and 7 pm near the I 4 corridor. Conditions are favorable for a few strong storms to develop 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 should push back across the intracoastal waters and nearshore Atlantic this afternoon and early evening, mainly north of Sebastian Inlet. Gusty outflow winds near 35 knots will be possible along with dangerous lightning strikes. Steering flow is toward the northeast around 15 mph but some storm motions will be erratic with propagation along boundaries. .FIRE WEATHER IMPACT... While a few areas saw heavy rain yesterday, continued dry vegetation in many areas will produce a high fire danger of wildfire spread. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. A typical convective season pattern is expected through the weekend 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... Spotters are requested to monitor the weather and self activate if needed. Kelly
Special Weather Statement
National Weather Service Melbourne FL
621 PM EDT WED MAY 31 2017
FLZ053-312300-
Osceola FL-
621 PM EDT WED MAY 31 2017
...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN OSCEOLA COUNTY UNTIL
700 PM EDT...
At 621 PM EDT, Doppler radar was tracking a strong thunderstorm near
Holopaw. This storm was nearly stationary.
Dime size hail and wind gusts of 50 to 55 mph will be possible with
this storm.
Locations impacted include...
Holopaw.
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.
&&
LAT...LON 2820 8114 2830 8104 2821 8091 2812 8097
2810 8105
TIME...MOT...LOC 2221Z 312DEG 2KT 2819 8103
SedlockSpecial Weather Statement
National Weather Service Melbourne FL
628 PM EDT WED MAY 31 2017
FLZ045-053-312330-
Osceola FL-Orange FL-
628 PM EDT WED MAY 31 2017
...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL ORANGE AND NORTH CENTRAL
OSCEOLA COUNTIES UNTIL 730 PM EDT...
At 627 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from Orlando to Narcoossee. Movement was east-
northeast at 10 to 15 mph.
Dime size hail and wind gusts of 50 to 55 mph will be possible with
these storms.
Locations impacted include...
Orlando, Winter Park, Maitland, Wedgefield and Azalea Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 2864 8143 2863 8133 2861 8132 2861 8124
2841 8095 2817 8116 2854 8146
TIME...MOT...LOC 2227Z 198DEG 17KT 2851 8136 2829 8124
SedlockSpecial Weather Statement
National Weather Service Melbourne FL
630 PM EDT WED MAY 31 2017
FLZ064-312315-
Martin FL-
630 PM EDT WED MAY 31 2017
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN MARTIN COUNTY UNTIL
715 PM EDT...
At 630 PM EDT, Doppler radar was tracking a strong thunderstorm near
J And S Fish Camp. This storm was nearly stationary.
Dime size hail and wind gusts up to 50 mph will be possible with this
storm.
Locations impacted include...
Indiantown and J And S Fish Camp.
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.
Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.
&&
LAT...LON 2700 8062 2708 8066 2711 8066 2712 8068
2713 8068 2716 8067 2711 8045 2696 8052
TIME...MOT...LOC 2230Z 294DEG 1KT 2709 8060
SedlockPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MELBOURNE FL
635 PM EDT WED MAY 31 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0632 PM TSTM WND GST ORLANDO EXECUTIVE AIRPO 28.55N 81.34W
05/31/2017 M40 MPH ORANGE FL ASOS
&&
JRSSpecial Weather Statement
National Weather Service Melbourne FL
643 PM EDT WED MAY 31 2017
FLZ046-312330-
Seminole FL-
643 PM EDT WED MAY 31 2017
...SIGNIFICANT WEATHER ADVISORY FOR SEMINOLE COUNTY UNTIL 730 PM
EDT...
At 642 PM EDT, Doppler radar was tracking a strong thunderstorm over
Winter Park, moving northeast at 15 mph.
Dime size hail and wind gusts of 50 to 55 mph will be possible with
this storm.
Locations impacted include...
Sanford, Altamonte Springs, Oviedo, Winter Springs and Casselberry.
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 2879 8140 2877 8106 2875 8106 2872 8103
2871 8104 2869 8102 2868 8102 2866 8101
2865 8100 2863 8101 2861 8099 2861 8133
2864 8133 2864 8142
TIME...MOT...LOC 2242Z 207DEG 13KT 2858 8131
SedlockPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MELBOURNE FL
653 PM EDT WED MAY 31 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0636 PM TSTM WND GST ORLANDO EXECUTIVE AIRPO 28.55N 81.34W
05/31/2017 M45 MPH ORANGE FL ASOS
&&
JRSThe Melbourne radar (KMLB), 114 km away, was scanning. The volume nearest the first event began at 23:01 UTC.
1 thunderstorm wind. Local standard time, as filed.
A strong thunderstorm with estimated wind gusts near 50 mph caused minor wind damage at the J & S Fish Camp in western Martin County. A park officer reported that four awnings were torn off mobile homes, and multiple medium sized tree branches were torn off trees.
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, May 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: 693934.