Plenty of tropical moisture combined with a frontal squall line brought thunderstorms to South Florida. Some of these thunderstorms in the squall line produced gusty winds knocking over a few trees in Broward County.
Every event with a place to put it. Tap one for its entry below.
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 MFL wrote it up.
Plenty of tropical moisture combined with a frontal squall line brought thunderstorms to South Florida. Some of these thunderstorms in the squall line produced gusty winds knocking over a few trees in Broward County.
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 Miami, FL wrote its last area forecast discussion before the first event at May 24, 6:25 PM EST, 33 minutes earlier.
Area Forecast Discussion
National Weather Service Miami FL
725 PM EDT Wed May 24 2017
.AVIATION...Widespread showers and storms ongoing across region
currently. Main squall line is now east of KAPF, will push through
east coast sites 00Z-02Z. Tempo IFR VSBYS/MVFR cigs along with gusts
40-45kts possible within any convection. Lull in activity expected
03Z-12Z as main line moves into Atlantic, with VCSH for all sites.
Increase in convection after daybreak as main front approaches,
with VCTS for all sites along with a return of gusty SW winds
15-20ktsG25kts.
&&
.PREV DISCUSSION... /issued 355 PM EDT Wed May 24 2017/
DISCUSSION...
..SEVERE THUNDERSTORM WATCH IN EFFECT FOR GLADES, COLLIER,
HENDRY, PALM BEACH, AND BROWARD COUNTIES THROUGH 11PM...
THIS AFTERNOON AND TONIGHT...The main concern for the remainder of
today and tonight continues to be for strong to severe storms across
all of South Florida. Outside of any convective development, it will
remain a hot and breezy day with temperatures currently peaking in
the low-mid 90s and southwest winds gusting to near 30 mph.
A warm, moist and unstable atmosphere is in place across South
Florida this afternoon with a few showers and storms already
developing across the region. Southwesterly flow is picking up to 30-
40kts between 4-9kft, with 0-1km helicities a respectable 100
m2/s2. Further north, severe weather is already ongoing across
Central and North Florida with widespread activity.
Severe storm potential looks to come in two phases. The first
will be this afternoon primarily along the east coast, where the
seabreeze has developed and pushed inland across Miami-Dade,
Broward and a portion of the Palm Beach barrier island. Scattered
showers and storms will continue to develop across the region for
the remainder of the afternoon, focusing along the Palm Beach and
Broward metro early evening. With a few models showing low level
helicities increasing to 200-300 m2/s2, along with the low level
jet picking up, the concern remains for strong wind gusts and
isolated tornadoes. Given the instability in place, hail also will
be a concern especially with storm collisions.
Second wave will be this evening through overnight across all of
the region as the pre-frontal squall line over the eastern Gulf
and west Florida approaches the region. Models have sped up the
timing of this line considerably, which is consistent with current
radar trends. The line may weaken as it approaches and moves
further away from its parent front/system, but earlier arrival may
mean more daytime instability is available. Convective activity
looks to continue through the overnight primarily north of a
Everglades City to Boca Raton line. The main threat with overnight
activity will be for strong winds, but isolated tornadoes may
remain a concern with boundary collisions.
Localized heavy downpours can not be ruled out with any activity,
but due to the ongoing dry conditions and quick storm movement, no
significant flooding is expected.
THURSDAY...Showers and storms will continue through the day on
Thursday as the front slowly moves through the area. The best
dynamics will be lifting off to the northeast with the main upper
level trough, though low level winds will continue around 40kts. The
threat for significant severe weather will rapidly diminish during
the morning hours, though a few gusty storms will remain possible.
Activity will diminish from NW to SE into the afternoon as the
front pushes further south.
EXTENDED MEMORIAL DAY WEEKEND...Frontal boundary will wash out
across the far southern peninsula by Friday, with the deeper
moisture finally shunted south of the region into Saturday behind a
secondary weak mid level trough passage. High pressure will build in
both at the surface and aloft, leading to a more suppressed
atmosphere and light winds. A typical South Florida summertime
pattern will be in place with the seabreezes developing and moving
inland each afternoon. A few showers and storms will likely develop
along the sea breeze as it moves in, with the best coverage in the
afternoons and early evening with the seabreeze collision over the
interior. Temperatures will be near to slightly above normal in the
upper 80s and low 90s.
NEXT WEEK...Surface high will move east into the western Atlantic
early next week, with low level flow becoming more easterly across
the region. While both seabreezes will still be able to develop and
move inland, the east coast seabreeze will be more dominant, with
the best afternoon shower/storm chances over the interior and Gulf
coast and the east coast likely staying dry.
MARINE...Strong and gusty south-southwesterly winds will continue
into early Thursday ahead of the cold front currently moving through
the Florida peninsula. Speeds will continue around 20kts, with gusts
up to 30 knots possible outside of any convection. Seas look to peak
around 6-7ft in the offshore Gulf overnight with similar heights in
the Gulf stream by early Thursday. A Small Craft Advisory remain in
effect for all of the local waters.
Numerous showers and storms are expected from late this afternoon
into this evening as the front pushes further south, with the
potential for a few strong to severe storms. Frequent lightning,
gusts over 50kts, and isolated waterspouts may accompany the
strongest storms.
The front will wash out across the region late Thursday, with winds
becoming west-southwest around 15 knots. Winds will become light and
variable into the upcoming Memorial Day Weekend, with the afternoon
seabreezes developing each afternoon. Winds may reach 10-15kts with
the seabreezes near the coast during the afternoon. Seas diminish to
2ft or less by Saturday. A few storms may affect the intracoastal in
the early afternoon, with the best chances generally over interior
waterways and Lake Okeechobee in the afternoons.
CLIMATE...The east coast metro areas will be getting close to the
record highs for today which are:
Cities Highs So Far Record Highs
MIA 91 94 - 2013
FLL 91 94 - 1951
PBI 91 96 - 1917
&&
.PRELIMINARY POINT TEMPS/POPS...
West Palm Beach 77 90 70 89 / 90 70 20 20
Fort Lauderdale 77 90 76 90 / 80 70 20 30
Miami 76 88 76 92 / 90 70 20 40
Naples 78 85 71 88 / 80 70 10 10
&&
.MFL WATCHES/WARNINGS/ADVISORIES...
FL...High Rip Current Risk through Thursday morning for FLZ069.
AM...Small Craft Advisory until 11 AM EDT Thursday for AMZ610-630.
Small Craft Advisory until 4 PM EDT Thursday for AMZ650-651-670-
671.
GM...Small Craft Advisory until 11 AM EDT Thursday for GMZ656-657-676.
&&
AVIATION...88/ALMHazardous Weather Outlook for South Florida National Weather Service Miami FL 150 PM EDT Wed May 24 2017 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 250600- Lake Okeechobee-Biscayne Bay- Coastal waters from Jupiter Inlet to Deerfield Beach FL out 20 NM- Coastal waters from Deerfield Beach to Ocean Reef FL out 20 NM- Waters from Jupiter Inlet to Deerfield Beach FL from 20 to 60 NM- Waters from Deerfield Beach to Ocean Reef FL from 20 to 60 NM excluding the territorial waters of Bahamas-Glades-Hendry- Inland Palm Beach-Metro Palm Beach-Coastal Collier-Inland Collier- Inland Broward-Metro Broward-Inland Miami-Dade-Metro Miami-Dade- Mainland Monroe-Coastal Palm Beach-Coastal Broward-Coastal Miami- Dade-Far South Miami-Dade- Coastal waters from Chokoloskee to Bonita Beach FL out 20 NM- Coastal waters from East Cape Sable to Chokoloskee FL out 20 NM- Waters from Chokoloskee to Bonita Beach FL from 20 to 60 NM- 150 PM EDT Wed May 24 2017 ...SLIGHT RISK OF SEVERE THUNDERSTORMS... ...HIGH RISK OF RIP CURRENTS GULF COAST BEACHES... ...SMALL CRAFT ADVISORY... This hazardous weather outlook is for South Florida. .DAY ONE...THIS AFTERNOON AND TONIGHT Rip currents: There is a High risk of rip currents on Gulf coast beaches. There is a moderate risk of rip currents Atlantic coast beaches. Thunderstorms: Scattered thunderstorms are expected this afternoon and tonight. Some of the thunderstorms may become severe with damaging winds and large hail. Isolated tornadoes can't be ruled out. Dangerous cloud to ground lightning can be expected. Tornadoes: A tornado cant be ruled out this afternoon and tonight, especially over northern sections of South Florida. Waterspouts: Waterspouts are possible on South Florida waters. Wind: Isolated severe thunderstorms with damaging wind gusts in excess of 60 mph are possible this afternoon and tonight, especially over northern sections of South Florida. In addition, gusty southerly winds of 20 to 30 knots will lead to hazardous marine conditions. A Small Craft Advisory is in effect. Waves: There is a slight risk for high seas around 7 feet in the offshore Gulf waters. Hail: Isolated severe thunderstorms may produce hail to the size of quarters this afternoon and tonight across South Florida. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY A small craft advisory for winds of 20 to 25 knots is in effect for Atlantic waters through Thursday afternoon. Thunderstorms are likely Thursday, especially early in the day. The primary hazard will be cloud to ground lightning, but gusty winds will accompany the stronger thunderstorms. Friday through early next week, a few thunderstorms are possible each afternoon, mainly over interior South Florida. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Individual spotters are encouraged to report high wind, hail and flooding to the National Weather Service forecast office in Miami. For more information...visit the National Weather Service in Miami website at www.weather.gov/miami.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Miami FL
638 PM EDT WED MAY 24 2017
FLZ066-069-070-073-242330-
Coastal Collier County FL-Hendry FL-Inland Collier County FL-
Inland Miami-Dade County FL-
638 PM EDT WED MAY 24 2017
...Significant Weather Advisory for 45 to 55 mph winds for eastern
Collier and southeastern Hendry Counties Until 730 PM EDT...
* At 637 PM EDT...Doppler radar was tracking a line of strong
thunderstorms extending from 7 miles northwest of Montura to near
Royal Palm Hammockm, moving east AT 40 mph.
* The primary impacts will be gusty winds of 45 to 55 mph. These
winds can down small tree limbs and branches...and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.
* LOCATIONS IMPACTED INCLUDE...
Ave Maria, Immokalee, Hendry Correctional, Big Cypress Seminole
Reservation, Big Cypress National Preserve, Dade-Collier Training
Airport, Copeland, Miles City, Sunniland, Bunker Hill, Jerome and
Deep Lake.
A severe thunderstorm watch remains in effect until 1100 PM EDT for
southern, southeastern and southwestern Florida.
LAT...LON 2675 8090 2582 8087 2581 8124 2595 8139
2639 8144
TIME...MOT...LOC 2237Z 270DEG 36KT 2670 8119 2599 8162
KScharfPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MIAMI FL
648 PM EDT WED MAY 24 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0545 PM MARINE TSTM WIND 6 E BUCKHEAD RIDGE 27.14N 80.79W
05/24/2017 M41 MPH AMZ610 FL MESONET
A THUNDERSTORM PRODUCED A WIND GUST OF 41 MPH OVER THE
NORTHERN PORTION OF LAKE OKEECHOBEE
&&
EVENT NUMBER MFL1700156
CWCPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MIAMI FL
712 PM EDT WED MAY 24 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0644 PM MARINE TSTM WIND 7 W PAHOKEE 26.82N 80.78W
05/24/2017 M41 MPH AMZ610 FL MESONET
A THUNDERSTORM PRODUCED A WIND GUST OF 41 MPH ON THE
SOUTHERN END OF LAKE OKEECHOBEE
&&
EVENT NUMBER MFL1700157
CWCSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Miami FL
712 PM EDT WED MAY 24 2017
FLZ066>075-168-172>174-250045-
Inland Collier County FL-Metro Broward County FL-Far South Miami-
Dade County FL-Inland Miami-Dade County FL-
Metro Palm Beach County FL-Coastal Miami Dade County FL-
Coastal Collier County FL-Inland Broward County FL-Hendry FL-
Coastal Broward County FL-Coastal Palm Beach County FL-
Mainland Monroe FL-Metropolitan Miami Dade FL-
Inland Palm Beach County FL-
712 PM EDT WED MAY 24 2017
...Significant Weather Advisory for 45 to 55 mph winds and the
development of funnel clouds for eastern Collier...Mainland Monroe...
Miami-Dade...southeastern Hendry...Broward and Palm Beach Counties
Until 845 PM EDT...
* At 709 PM EDT...Doppler radar was tracking a Line of strong
thunderstorms with rotation, Capable of producing a funnel cloud
along a line extending from near Palm City to near Big Cypress
Seminole Reservation to 8 miles southwest of Wilderness Waterway
to 16 miles southwest of Middle Cape Sable...and moving east
northeast, at 40 mph. There are also showers and thunderstorms
ahead of the line, over the east coast metro areas, which are
capable of producing wind gusts of 45 to 55 mph.
* In addition, gusty winds from 45 TO 55 mph are possible. These
winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.
* LOCATIONS IMPACTED INCLUDE...
Miami, Hialeah, Fort Lauderdale, Pembroke Pines, Hollywood,
Miramar, Coral Springs, West Palm Beach, Pompano Beach, Davie,
Miami Beach, Plantation, Sunrise, Boca Raton, Deerfield Beach,
Boynton Beach, Delray Beach, Homestead, Tamarac and Wellington.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Funnel clouds occasionally touch down and produce tornadoes. Move
indoors and stay away from windows.
Residents should remain on the alert for additional statements and
possible warnings.
Stay tuned to NOAA weather radio and other local media for further
details or updates.
&&
A severe thunderstorm watch remains in effect until 1100 PM EDT for
southern, southeastern and southwestern Florida.
LAT...LON 2619 8004 2590 8014 2537 8020 2514 8118
2521 8125 2537 8120 2565 8136 2573 8134
2576 8142 2630 8138 2682 8085 2680 8082
2703 8064 2696 8061 2697 8003
TIME...MOT...LOC 2309Z 249DEG 36KT 2708 8028 2623 8098 2554 8123 2504
8137
SIPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MIAMI FL
713 PM EDT WED MAY 24 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0644 PM MARINE TSTM WIND 10 NW PAHOKEE 26.90N 80.79W
05/24/2017 M40 MPH AMZ610 FL MESONET
A THUNDERSTORM PRODUCED A WIND GUST OF 40 MPH OVER THE
CENTER OF LAKE OKEECHOBEE
&&
EVENT NUMBER MFL1700158
CWCPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MIAMI FL
726 PM EDT WED MAY 24 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0708 PM MARINE TSTM WIND 1 E HOMESTEAD PARK 25.44N 80.31W
05/24/2017 M44 MPH AMZ630 FL MESONET
A THUNDERSTORM PRODUCED A WIND GUST OF 44 MPH AT TURKEY
POINT.
&&
EVENT NUMBER MFL1700159
CWCThe Miami radar (KAMX), 51 km away, was scanning. The volume nearest the first event began at 23:55 UTC.
2 thunderstorm wind. Local standard time, as filed.
A thunderstorm produced a 61 mph / 53 knot wind gust at the WeatherBug mesonet site located at Cypress Bay High School in Weston.
An off duty NWS employee reported multiple medium sized trees down on 196 Ave between Griffin Road and Sheridan Street due to thunderstorms.
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: 697981, 697984.