A weakening upper-level trough over the Florida Peninsula created an atmosphere that was conducive for diurnal convection as showers and storms developed along sea-breeze boundaries.
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.
A weakening upper-level trough over the Florida Peninsula created an atmosphere that was conducive for diurnal convection as showers and storms developed along sea-breeze boundaries.
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 Sep 9, 1:21 PM EST, 4 hours 24 minutes earlier.
Area Forecast Discussion National Weather Service Miami FL 221 PM EDT Sat Sep 9 2023 ...New LONG TERM... .SHORT TERM... (Rest of today through Sunday) Issued at 1200 PM EDT Sat Sep 9 2023 Models depict a departing trough/low complex moving NE across the eastern seaboard and away from SoFlo, while sea breeze/convective cells have been developing along the Atlantic coast since the late morning hours. E/SE winds around 10 kt will continue to establish as the ridge over the NW Atl expands into the region. Any additional convection will likely develop more towards the interior areas as sea breezes push inland. Latest GFS/EURO and local solutions do keep some lingering energy in the wake of the trough/low, which could be enough to support a few strong storms near the lake region. 12Z MFL sounding data show PWATs increasing to near 2 inches, and a moist layer around 900 mb. Thus, general PoPs have been adjusted into the 60 percent range for interior areas, and into the 50 percent range for the east coast based on current trends. For Sunday, expect a similar weather scenario with no significant changes in the pattern or the wind flow. But a slightly drier air mass will keep POPs in the scattered category, around 40-50 percent. Any thunderstorm that forms will have the potential to produce gusty winds, localized heavy rain, and lightning. Afternoon temperatures will remain in the low-mid 90s, while morning lows will be in the mid-upper 70s. && .LONG TERM... (Sunday night through next Friday) Issued at 221 PM EDT Sat Sep 9 2023 Synoptic Overview: The start of the extended period will be characterized by rising heights over the area as ridging nosing northwest out of the southern Carribean and temporarily bridges with the more expansive subtropical high over the western Atlantic. This composite western Atlantic ridge will erode by mid- week as a potent shortwave moves through the Great Lakes (thus creating the weakness to draw Lee northward away from our area). At the surface, light easterly flow will prevail for the start of the workweek as SFL resides on the southern fringe of high pressure over the western Atlantic, with the flow becoming more N-NErly by the mid-week period as the gradient tightens between high pressure over the Central US and Hurricane Lee passing over the western Atlantic. Late in the period (Thursday/Friday) a cold front will cross into Northern Florida and likely stall in that vicinity to end the workweek. PWATs will generally remain below climo through the period, ranging between 1.5-2 inches (10th-40th percentiles) with the highest values likely early and late week, with a period of lower values expected mid-week at the flow shifts more N-NE and some drier mid-latitude air temporarily filters in ahead of the late- week front. Details: A relatively typical easterly flow sea-breeze dominant convective regime set up looks likely on Monday with the best rain chances shifting from near the east coast in the morning/early afternoon to the Interior and west coast later in the afternoon. Rain chances will be slightly lower (but with a similar spatiotemporal pattern) on Tuesday as the 1000-700mb mean flow acquires more of a northerly component and slightly drier air begins to filter in. Wednesday will likely be somewhat drier still, with rain chances then becoming more uncertain late week due to uncertainty surrounding the front's southward progress. High temperatures are generally expected to run in the low to mid 90s, while max heat indices will decrease from around 105 early in the week, to around 100 in the mid-late week as the somewhat drier air moves in. && .AVIATION... (18Z TAFS) Issued at 106 PM EDT Sat Sep 9 2023 MVFR periods are possible for the Atlantic terminals as early afternoon convection began developing along the sea breeze boundaries. MVFR/VFR impacts should be brief as most showers/storms should be short-lived. Winds will shift mainly to the ESE around 10kt after 18Z, except at APF where the Gulf breeze will keep westerly flow through around 23-00Z. Winds become light and variable tonight with VFR prevailing overnight. && .MARINE... Issued at 106 PM EDT Sat Sep 9 2023 Benign conditions are expected to continue through the rest of the weekend and into early next week. Winds will generally be 5-10kts with occasional gusts up to 15kts. There will be chances for some widely scattered showers and storms that could result in locally higher seas and wind gusts at times, but overall calm conditions persist. && .PRELIMINARY POINT TEMPS/POPS... Miami 78 91 79 92 / 10 40 20 30 West Kendall 76 94 77 94 / 10 40 10 30 Opa-Locka 77 92 77 92 / 10 40 20 40 Homestead 77 91 77 91 / 10 30 20 30 Fort Lauderdale 77 90 78 90 / 10 40 20 40 N Ft Lauderdale 78 91 78 92 / 20 40 20 40 Pembroke Pines 77 91 77 92 / 10 40 20 40 West Palm Beach 77 91 77 91 / 10 40 20 40 Boca Raton 77 91 78 92 / 20 40 20 40 Naples 77 93 78 94 / 10 40 10 30 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && SHORT TERM...99 LONG TERM....Carr AVIATION...99
Hazardous Weather Outlook National Weather Service Miami FL 351 AM EDT Sat Sep 9 2023 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 100800- 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 County-Metro Palm Beach County- Coastal Collier County-Inland Collier County-Inland Broward County- Metro Broward County-Inland Miami-Dade County- Metropolitan Miami Dade-Mainland Monroe-Coastal Palm Beach County- Coastal Broward County-Coastal Miami Dade County-Far South Miami- Dade County- 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- 351 AM EDT Sat Sep 9 2023 ...Scattered Storms Mostly Interior this Afternoon and Evening... This Hazardous Weather Outlook is for Atlantic coastal waters, southeast Florida, southern Florida, southwest Florida and Gulf of Mexico. .DAY ONE...Today and tonight. Thunderstorms: Scattered thunderstorms are expected later this afternoon into the evening over primarily interior portions of South Florida. Gusty winds, frequent lightning, and heavy rain are the main threats. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Scattered thunderstorms will be possible through the weekend and into early next week, especially over interior and southwest FL. The strongest thunderstorms could contain heavy downpours and gusty winds. Heat indices begin to climb back into the 100F-105F range by early next week. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report high wind, hail, and flooding to the National Weather Service forecast office in Miami.
Special Weather Statement
National Weather Service Miami FL
210 PM EDT Sat Sep 9 2023
FLZ067-091845-
Inland Palm Beach County FL-
210 PM EDT Sat Sep 9 2023
...A strong thunderstorm will impact portions of central Palm Beach
County through 245 PM EDT...
At 210 PM EDT, National Weather Service meteorologists were tracking
a strong thunderstorm over Lion Country Safari Park, or 9 miles west
of Wellington. This storm was nearly stationary.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Lion Country Safari Park and Loxahatchee NWR.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
LAT...LON 2663 8033 2661 8061 2683 8059 2681 8031
TIME...MOT...LOC 1810Z 205DEG 2KT 2668 8039
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
HadiSpecial Weather Statement
National Weather Service Miami FL
321 PM EDT Sat Sep 9 2023
FLZ073-173-174-091945-
Far South Miami-Dade County FL-Inland Miami-Dade County FL-
Coastal Miami Dade County FL-
321 PM EDT Sat Sep 9 2023
...A strong thunderstorm will impact portions of central Miami-Dade
County through 345 PM EDT...
At 321 PM EDT, National Weather Service meteorologists were tracking
a strong thunderstorm over The Redland, moving southeast at 15 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Homestead, Homestead General Airport, Homestead Miami Speedway, The
Redland, Florida City, Homestead Base, Naranja, Princeton, Leisure
City, Homestead Bayfront Park, Goulds and Inlikita.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
LAT...LON 2550 8063 2565 8051 2545 8027 2530 8049
TIME...MOT...LOC 1921Z 313DEG 11KT 2552 8051
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
HadiSpecial Weather Statement
National Weather Service Miami FL
343 PM EDT Sat Sep 9 2023
FLZ071-072-092015-
Inland Broward County FL-Metro Broward County FL-
343 PM EDT Sat Sep 9 2023
...A strong thunderstorm will impact portions of northern Broward
County through 415 PM EDT...
At 343 PM EDT, National Weather Service meteorologists were tracking
a strong thunderstorm near Tamarac. This storm was nearly stationary.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Coral Springs, Davie, Plantation, Sunrise, Tamarac, Margate,
Lauderhill, Weston, North Lauderdale, Sawgrass Mills Mall,
Intersection I-75 And U.S. 27, Pine Island Ridge and Markham Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
LAT...LON 2628 8040 2624 8022 2607 8026 2611 8046
TIME...MOT...LOC 1943Z 027DEG 4KT 2622 8032
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
HadiSpecial Weather Statement
National Weather Service Miami FL
414 PM EDT Sat Sep 9 2023
FLZ071-072-172-092045-
Inland Broward County FL-Coastal Broward County FL-
Metro Broward County FL-
414 PM EDT Sat Sep 9 2023
...Strong thunderstorms will impact portions of northern Broward
County through 445 PM EDT...
At 414 PM EDT, National Weather Service meteorologists were tracking
strong thunderstorms along a line extending from Coconut Creek to
Tamarac to near Intersection I-75 And U.S. 27. Movement was south at
10 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Fort Lauderdale, Coral Springs, Pompano Beach, Davie, Plantation,
Sunrise, Tamarac, Margate, Lauderhill, Weston, Coconut Creek, Oakland
Park, North Lauderdale, Lauderdale Lakes, Wilton Manors, Lazy Lake,
Broadview-Pompano Park, St. George, Pine Island Ridge and Village
Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 2615 8013 2607 8026 2611 8046 2621 8041
2625 8027 2631 8018
TIME...MOT...LOC 2014Z 355DEG 7KT 2627 8019 2619 8027 2618 8040
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
HadiSpecial Weather Statement
National Weather Service Miami FL
431 PM EDT Sat Sep 9 2023
FLZ071-092100-
Inland Broward County FL-
431 PM EDT Sat Sep 9 2023
...A strong thunderstorm will impact portions of central Broward
County through 500 PM EDT...
At 431 PM EDT, National Weather Service meteorologists were tracking
a strong thunderstorm over Intersection I-75 And U.S. 27, or 9 miles
west of Sunrise, moving west at 5 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Mile Marker 30 On Alligator Alley, East Toll Gate On Alligator Alley
and Intersection I-75 And U.S. 27.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
LAT...LON 2621 8041 2611 8046 2610 8055 2623 8055
2623 8045
TIME...MOT...LOC 2031Z 087DEG 6KT 2618 8045
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
HadiSpecial Weather Statement
National Weather Service Miami FL
445 PM EDT Sat Sep 9 2023
FLZ072-172-092115-
Coastal Broward County FL-Metro Broward County FL-
445 PM EDT Sat Sep 9 2023
...A strong thunderstorm will impact portions of central Broward
County through 515 PM EDT...
At 444 PM EDT, National Weather Service meteorologists were tracking
a strong thunderstorm over Lauderdale Lakes, or near Fort Lauderdale,
moving southeast at 10 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Fort Lauderdale, Hollywood, Pompano Beach, Davie, Plantation,
Sunrise, Tamarac, Margate, Lauderdale-By-The-Sea, Lauderhill, Coconut
Creek, Oakland Park, North Lauderdale, Lauderdale Lakes, Dania Beach,
Wilton Manors, Sea Ranch Lakes, Lazy Lake, Broadview-Pompano Park and
St. George.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
LAT...LON 2613 8029 2624 8022 2622 8008 2602 8011
TIME...MOT...LOC 2044Z 319DEG 7KT 2616 8019
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
HadiThe Miami radar (KAMX), 141 km away, was scanning. The volume nearest the first event began at 22:45 UTC.
1 funnel cloud. Local standard time, as filed.
Broadcast Media shared photos of a funnel cloud near Golden Gate Estates, associated with a shower moving over the area.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2023Every state in 2023This day in weather historyWarnings in Florida, September 2023
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: 1141343.