Strong showers and storms sparked from both the Gulf and Atlantic sea breezes produced heavy rainfall, hail, and strong winds across inland sections of South FL during the afternoon hours.
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.
Strong showers and storms sparked from both the Gulf and Atlantic sea breezes produced heavy rainfall, hail, and strong winds across inland sections of South FL during the afternoon hours.
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 31, 2:36 PM EST, 1 hour 4 minutes earlier.
Area Forecast Discussion National Weather Service Miami FL 336 PM EDT Mon May 31 2021 .DISCUSSION... Short Term (Tonight through Tuesday): Some showers and storms have developed along the sea breezes as they advance inland this afternoon. The Atlantic sea breeze has interacted with some other boundaries including the sea breeze off Florida Bay to produce some stronger cells. The 12z MFL sounding had a 500 mb temperature of -11 deg C and a healthy 7 C/km lapse rate leading to the hail growth zone. Radar returns of some of the early storm structure today certainly confirms this with some three body scatter spikes evident though the updrafts of the storms had trouble becoming sustained due to the lack of shear to separate them from the downdrafts. That will be a major inhibiting factor for convection today but boundary interactions and sea breeze collisions could provide enough localized shear (particularly around the Gulf coast breeze) to allow for some cells to reach near severe thresholds. The primary concerns are strong to damaging wind gusts, hail to the size of quarter dollars, frequent to excessive cloud-to- ground lightning, and localized torrential rainfall. Overnight, the activity should push westward into the Gulf with the focus returning over the local waters. With the mid-level trough lingering offshore near the Bahamas, activity will likely continue over the Atlantic waters overnight and spread close to the east coast metro through the morning hours. Repeat a similar pattern for Tuesday as the morning coastal convection spreads inland with the sea breezes with the easterly flow again favoring a peak over Southwest Florida in the late afternoon/early evening. One question for Tuesday is will the pocket of air aloft remain as cold or begin to moderate. Moderation of the temperatures back to the -9 deg C or so neighborhood looks most likely, but soundings should be helpful to diagnose the moderation of the airmass aloft. Overall, strong storms look to remain an afternoon to evening staple through the short term. Long term (Tuesday night - Saturday): Models depict an upper level trough gradually migrating east of the state, while a mid level low gradually weakens and breaks down. Meanwhile, moisture advection continues thanks to the persisting SE flow at the low levels, as a stationary sfc front lingers across central FL. This synoptic scenario will remain favorable for scattered to numerous showers with embedded thunderstorms to continue at least through Thursday. A few cells may become strong or even severe at times. Any thunderstorm that forms will be capable of producing damaging winds, small hail, and localized flooding. For the end of the week, sea breezes will continue to become focal points for afternoon convection, although as the upper trough departs and the mid level low dissipates the chances for deep convection will decrease. Thus, the main threat that will remain in place for the end of the long term will be potential for heavy rain and localized flooding. For the upcoming weekend, the western edge of the Atlantic high will begin filtering into the area, with the sfc ridge moving closer to SoFlo. This will result in a subtle veering of the low- level winds towards the southeast, and a decrease in POPs/Wx coverage. However, enough lingering moisture will remain in place for at least scattered showers and isolated storms to remain in the forecast. The enhanced cloud cover will help in keeping slightly cooler temperatures each afternoon, with a gradual warming trend of a degree or two expected towards the upcoming weekend. && .MARINE... An upper level low over the area will enhance conditions for showers and thunderstorms to continue over the coastal waters through the forecast period. As the east wind becomes stronger, borderline hazardous conditions for small craft may develop later this week. While seas are forecast to generally remain below advisory levels, gusty conditions for storms may cause locally rough seas, as well as waterspouts. All craft should exercise caution in and near areas of active weather. && .BEACH FORECAST... While the risk of rip currents should be low for the rest of today, increasing easterly wind should enhance the risk for the Atlantic beaches through the remainder of the week. && .PRELIMINARY POINT TEMPS/POPS... Miami 75 86 76 87 / 50 60 40 60 West Kendall 75 87 74 88 / 50 60 40 60 Opa-Locka 76 86 75 87 / 50 60 40 60 Homestead 74 86 75 86 / 50 60 40 60 Fort Lauderdale 76 85 76 86 / 50 60 40 60 N Ft Lauderdale 75 85 75 85 / 50 60 40 60 Pembroke Pines 75 86 75 86 / 50 60 40 60 West Palm Beach 74 86 73 86 / 50 60 40 60 Boca Raton 75 85 75 86 / 50 60 40 60 Naples 72 89 72 90 / 30 70 20 60 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && Tonight/Tuesday and Aviation/Marine...RAG Tuesday Night through Monday...AR Visit us at weather.gov/miami Follow us on Facebook and Twitter at: www.facebook.com/nwsmiami www.twitter.com/nwsmiami
Hazardous Weather Outlook for South Florida...UPDATED National Weather Service Miami FL 910 AM EDT Mon May 31 2021 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 010500- 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- 910 AM EDT Mon May 31 2021 ...Strong to Severe Storms Possible This Afternoon and Evening... This hazardous weather outlook is for South Florida. .DAY ONE...TODAY AND TONIGHT Thunderstorms: Strong to severe thunderstorms are possible across the area, mainly in the afternoon and evening. The main hazards are lightning, damaging wind gusts, and hail. Waterspouts: There is a slight chance of waterspouts for all South Florida waters. Hail: Hail up to the size of a quarter dollar is possible with the strongest storms. Wind: In general, thunderstorm wind gusts of 45 to 55 mph are possible with strong storms. An isolated severe wind gust cannot be ruled out this afternoon and evening, particularly in Southwest Florida. Wind gusts of over 20 kts are possible over the South Florida waters. Flooding: There is a slight chance of localized flooding through the evening hours, if heavy rain persists over a specific area, or repeatedly affects the same areas for an extended period of time. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY There is a chance of thunderstorms through the work week. Some of the thunderstorms could be strong early in the week containing gusty winds, hail, and possibly cause urban flooding. The threat of rip currents will increase for the middle of the week along the east coast beaches of South Florida as the easterly winds increase. .SPOTTER INFORMATION STATEMENT... Widespread spotter activation is not anticipated, however, individual spotters are encouraged to report high winds, flooding, and hail 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. RAG
Special Weather Statement
National Weather Service Miami FL
1233 PM EDT Mon May 31 2021
FLZ073-075-174-311730-
Mainland Monroe FL-Far South Miami-Dade County FL-Inland Miami-
Dade County FL-
1233 PM EDT Mon May 31 2021
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN MAINLAND MONROE AND
WESTERN MIAMI-DADE COUNTIES UNTIL 130 PM EDT...
* At 1232 PM EDT, National Weather Service meteorologists were
tracking strong thunderstorms along a line extending from 7 miles
northwest of Royal Palm Ranger to 10 miles southeast of Mahogany
Hammock. Movement was west at 15 mph.
* Small hail, excessive cloud-to-ground lightning, funnel clouds, and
winds in excess of 45 mph possible with these storms.
* Locations impacted include...
The Redland, Mahogany Hammock, Everglades National Park, Flamingo
and Pa-Hay-Okee Overlook.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This activity was also developing in an environment favorable for the
formation of funnel clouds. Stay tuned to NOAA weather radio and
local media for additional updates and possible warnings.
Persons participating in outdoor activities should seek sturdy
shelter until these storms pass. Open shelters found in parks,
beaches, or golf courses offer no protection from the dangers of
lightning.
&&
LAT...LON 2512 8107 2563 8098 2555 8057 2517 8068
2516 8066 2514 8071 2517 8073 2517 8074
2515 8072 2516 8076 2514 8078 2515 8080
2518 8081 2516 8082 2518 8084 2517 8090
2514 8090
TIME...MOT...LOC 1632Z 091DEG 14KT 2548 8067 2523 8072
RAGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MIAMI FL
1239 PM EDT MON MAY 31 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1221 PM WILDFIRE 4 WNW KENDALE LAKES 25.73N 80.48W
05/31/2021 MIAMI-DADE FL LAW ENFORCEMENT
PER FHP, KROME AVE IS CURRENTLY SHUTDOWN
BETWEEN KENDALL DR. AND SW 8 ST DUE TO A
LARGE FIRE IN THE AREA. NO ESTIMATES ON
ACREAGE OR SIZE AT THIS TIME.
&&
FELLSpecial Weather Statement
National Weather Service Miami FL
115 PM EDT Mon May 31 2021
FLZ070-071-073-311800-
Inland Broward County FL-Inland Collier County FL-Inland Miami-
Dade County FL-
115 PM EDT Mon May 31 2021
...SIGNIFICANT WEATHER ADVISORY FOR EASTERN COLLIER...NORTHERN
MIAMI-DADE AND SOUTHERN BROWARD COUNTIES UNTIL 200 PM EDT...
* At 115 PM EDT, National Weather Service meteorologists were
tracking a strong thunderstorm 10 miles northeast of Dade-Collier
Training Airport, or 26 miles west of Miramar, moving southwest at
5 mph.
* Small hail and winds in excess of 45 mph possible with this storm.
* Locations impacted include...
Big Cypress National Preserve.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with this storm. If
you can hear thunder, you are close enough to be struck! Seek a safe
shelter inside a building or vehicle.
To report severe weather, contact your nearest law enforcement
agency. You can also share your report with NWS Miami on Facebook and
Twitter.
&&
LAT...LON 2614 8063 2592 8048 2576 8080 2598 8096
2607 8080
TIME...MOT...LOC 1715Z 049DEG 5KT 2595 8076
CWCSpecial Weather Statement National Weather Service Miami FL 333 PM EDT Mon May 31 2021 FLZ066-070-071-312015- Inland Broward County FL-Hendry FL-Inland Collier County FL- 333 PM EDT Mon May 31 2021 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN COLLIER AND SOUTHEASTERN HENDRY COUNTIES UNTIL 415 PM EDT... * At 333 PM EDT, National Weather Service meteorologists were tracking a strong thunderstorm 7 miles northwest of Big Cypress Seminole Reservation, or 20 miles south of Montura, moving southwest at 15 mph. * Small hail and winds in excess of 45 mph possible with this storm. * Locations impacted include... Hendry Correctional and Big Cypress Seminole Reservation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Frequent cloud to ground lightning is occurring with this storm. If you can hear thunder, you are close enough to be struck! Seek a safe shelter inside a building or vehicle. To report severe weather, contact your nearest law enforcement agency. You can also share your report with NWS Miami on Facebook and Twitter. && LAT...LON 2648 8103 2627 8088 2611 8124 2642 8131 TIME...MOT...LOC 1933Z 067DEG 11KT 2635 8107 CWC
Special Weather Statement
National Weather Service Miami FL
349 PM EDT Mon May 31 2021
FLZ070-312030-
Inland Collier County FL-
349 PM EDT Mon May 31 2021
...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN COLLIER COUNTY UNTIL
430 PM EDT...
* At 349 PM EDT, National Weather Service meteorologists were
tracking a strong thunderstorm over Big Corkscrew Island, or near
Ave Maria, moving west at 10 mph.
* Small hail and winds in excess of 45 mph possible with this storm.
* Locations impacted include...
Ave Maria, Golden Gate Estates, Immokalee, Orangetree, Big
Corkscrew Island, West Toll Gate On Alligator Alley, Golden Gate,
Miles City, Corkscrew Swamp Sanctuary, Intersection I-75 And
Everglades Blvd and Lake Trafford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with this storm. If
you can hear thunder, you are close enough to be struck! Seek a safe
shelter inside a building or vehicle.
To report severe weather, contact your nearest law enforcement
agency. You can also share your report with NWS Miami on Facebook and
Twitter.
&&
LAT...LON 2632 8166 2642 8166 2642 8156 2644 8156
2646 8142 2613 8131 2609 8166 2632 8173
TIME...MOT...LOC 1949Z 068DEG 10KT 2634 8150
CWCSpecial Weather Statement
National Weather Service Miami FL
413 PM EDT Mon May 31 2021
FLZ069-070-312100-
Coastal Collier County FL-Inland Collier County FL-
413 PM EDT Mon May 31 2021
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN COLLIER COUNTY UNTIL
500 PM EDT...
* At 413 PM EDT, National Weather Service meteorologists were
tracking a strong thunderstorm near Royal Palm Hammock, or 11 miles
northeast of Marco Island, moving southwest at 15 mph.
* Small hail and winds in excess of 45 mph possible with this storm.
* Locations impacted include...
Naples, Marco Island, Golden Gate Estates, Carnestown, Cape Romano,
Belle Meade, Golden Gate, East Naples, Lely Resort, Copeland,
Vineyards, Royal Palm Hammock, Naples Park, Marco Island Airport,
Naples Manor, North Naples, Big Cypress National Preserve, Pelican
Bay, Lely and Rookery Bay Aquatic Preserve.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This activity was also developing in an environment favorable for the
formation of funnel clouds. Stay tuned to NOAA weather radio and
local media for additional updates and possible warnings.
To report severe weather, contact your nearest law enforcement
agency. You can also share your report with NWS Miami on Facebook and
Twitter.
&&
LAT...LON 2633 8184 2633 8182 2632 8182 2632 8173
2609 8164 2614 8132 2596 8123 2579 8158
2581 8161 2578 8166 2606 8184
TIME...MOT...LOC 2013Z 054DEG 12KT 2605 8158
CWCThe Miami radar (KAMX), 139 km away, was scanning. The volume nearest the first event began at 20:39 UTC.
1 thunderstorm wind. Local standard time, as filed.
A trained spotter estimated wind gusts to 60 mph and pea size hail at Rattlesnake Hammock Road and SR 951, just west of Collier Blvd.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2021Every state in 2021This day in weather historyWarnings in Florida, May 2021
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: 958383.