Widespread showers and thunderstorms developing in association with a deep-layered cyclonic circulation near the Yucatan Peninsula produced isolated severe thunderstorm wind gusts at the Key West International Airport.
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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 KEY wrote it up.
Widespread showers and thunderstorms developing in association with a deep-layered cyclonic circulation near the Yucatan Peninsula produced isolated severe thunderstorm wind gusts at the Key West International Airport.
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 Key West, FL wrote its last area forecast discussion before the first event at Sep 24, 2:07 PM EST, 5 hours 10 minutes earlier.
Area Forecast Discussion National Weather Service Key West FL 307 PM EDT Sun Sep 24 2023 ...New DISCUSSION, MARINE, AVIATION... .DISCUSSION... Issued at 213 PM EDT Sun Sep 24 2023 Since this morning's storms, the island chain has been mostly sunny at times and rain-free. East winds average around 10 mph, while Reef locations have occasionally increased to 15 to 20 knots for tens of minutes due to the outflows from decaying thunderstorms. The KBYX radar detects strong thunderstorms southeast of the Upper Keys, and also a few long-track storms to the west of Key West. Storm motion is slightly deviant, indicating some meager organization to these storm cells. The KBYX VWP is confounded by bird motions, and derived hodographs are likely compromised. KBYX all-tilt data continues to sample weak mesocyclones in the 8-10 kft elevation data for the storms to the west of Key West. .FORECAST... The deep cyclone near the Yucatan Channel will lumber westward over the next few days as a mean-layer anticyclone develops over the southeastern Bahamas and Greater Antilles. This will set the stage for several days of rich, moisture laden east- southeasterlies. With supergeostrophic flow racing to the northeast around the apex of the ridge, the Keys will occasionally be within the favorable right-entrance-region of the subtropical jet. Forecast soundings and plan view depictions suggest a remarkable stretch of unsettled weather through at least Thursday, and although we highlight a return to near normal rain/thunder chances by next weekend, this may not be the case. The trend over the past severals days has been a little more breeze, POPs trending higher, and the unsettled weather lasting longer. We have leaned on these trends for both the digital and derived products. && .MARINE... Issued at 213 PM EDT Sun Sep 24 2023 There are no watches, warnings, or advisories currently in effect for the coastal waters of the Florida Keys. From synopsis, a disorganized trough near the Yucatan Channel will migrate westward over the next few days as Atlantic ridging builds westward into Florida. Breezes will be primarily gentle to moderate and out of the east. Above normal rain and thunder chances will continue for the next several days. && .AVIATION... (18Z TAFS) Issued at 213 PM EDT Sun Sep 24 2023 VFR conditions will prevail at both island terminals through the TAF period. Into this evening the terminals will remain mostly dry, but VCSH is included starting at 0z when shower activity is expected to pick back up. TEMPOs will be included for MVFR conditions if thunderstorms approach either terminal at that time. Near-surface winds out of convection will be mainly southeast at 5 to 10 knots. && .PRELIMINARY POINT TEMPS/POPS... Key West 82 92 83 90 / 60 50 50 60 Marathon 82 93 83 91 / 50 50 50 60 && .KEY WATCHES/WARNINGS/ADVISORIES... FL...None. GM...None. && Public/Marine/Fire...CLR Aviation/Nowcasts....AP Data Acquisition.....JPR Visit us on the web at weather.gov/key Follow us on Facebook and Twitter at: www.facebook.com/nwskeywest www.twitter.com/nwskeywest
Hazardous Weather Outlook National Weather Service Key West FL 535 AM EDT Sun Sep 24 2023 FLZ076>078-GMZ031>035-042>044-052>055-072>075-250945- Monroe Upper Keys-Monroe Middle Keys-Monroe Lower Keys- Florida Bay including Barnes Sound, Blackwater Sound, and Buttonwood Sound- Bayside and Gulf side from Craig Key to west end of Seven Mile Bridge- Gulf waters from East Cape Sable to Chokoloskee 20 to 60 NM out and beyond 5 fathoms- Gulf of Mexico including Dry Tortugas and Rebecca Shoal Channel- Gulf of Mexico from west end of Seven Mile Bridge to Halfmoon Shoal out to 5 Fathoms- Hawk Channel from Ocean Reef to Craig Key out to the reef- Hawk Channel from Craig Key to west end of Seven Mile Bridge out to the reef- Hawk Channel from west end of Seven Mile Bridge to Halfmoon Shoal out to the reef- Straits of Florida from Ocean Reef to Craig Key out 20 NM- Straits of Florida from Craig Key to west end of Seven Mile Bridge out 20 NM- Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal out 20 NM- Straits of Florida from Halfmoon Shoal to 20 NM west of Dry Tortugas out 20 NM- Straits of Florida from Ocean Reef to Craig Key 20 to 60 NM out- Straits of Florida from Craig Key to west end of Seven Mile Bridge 20 to 60 NM out- Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal 20 to 60 NM out- Straits of Florida from Halfmoon Shoal to 20 NM west of Dry Tortugas 20 to 60 NM out- 535 AM EDT Sun Sep 24 2023 This Hazardous Weather Outlook is for the Florida Keys and adjacent coastal waters. .DAY ONE...Today and tonight. Scattered thunderstorms are expected today and tonight. The primary thunderstorm hazards will be cloud to surface lightning strikes, along with gusty winds. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Isolated to scattered thunderstorms will be possible through the period. The primary thunderstorm hazards will be cloud to surface lightning strikes, along with gusty winds. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement
National Weather Service Key West FL
749 PM EDT Sun Sep 24 2023
FLZ078-250045-
Monroe Lower Keys FL-
749 PM EDT Sun Sep 24 2023
...A LINE OF STRONG THUNDERSTORMS WILL IMPACT LOWER KEYS THROUGH 845
PM EDT...
At 748 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 17 miles north of Marquesas Keys to 18 miles
south of Key West. Movement was northeast at 25 mph.
HAZARD...Wind gusts up to 45 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Key West, Boca Chica, Big Coppitt Key, Boca Chica Channel Bridge,
Niles Channel Bridge, Saddlebunch Keys, Geiger Key, Sunset Key, Shark
Key, and Upper Sugarloaf Key.
This includes US 1 between mile markers 0 and 26.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 2452 8198 2456 8201 2456 8197 2459 8198
2463 8194 2463 8191 2459 8189 2458 8184
2467 8179 2473 8168 2470 8162 2478 8159
2478 8154 2482 8151 2460 8139 2461 8143
2458 8146 2460 8151 2452 8176
TIME...MOT...LOC 2348Z 223DEG 21KT 2481 8207 2429 8179
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
LIWPreliminary Local Storm Report
National Weather Service Key West FL
808 PM EDT Sun Sep 24 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0802 PM Tstm Wnd Gst 1 WSW Key West 24.55N 81.79W
09/24/2023 E54 MPH Monroe FL Official NWS Obs
A westerly wind gust of 47 kts, or 54 mph,
was recorded by the Florida Keys NWS RSOIS
at 8:02 PM EDT.
&&
RossPreliminary Local Storm Report
National Weather Service Key West FL
810 PM EDT Sun Sep 24 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0755 PM Tstm Wnd Gst 1 WNW Key West 24.57N 81.80W
09/24/2023 M51 MPH Monroe FL Mesonet
A westerly wind gust of 44 kts, or 51 mph,
was recorded by the WeatherFlow mesonet site
at U.S. Coast Guard Sector Key West at 8:00
PM EDT.
&&
RossPreliminary Local Storm Report...Corrected
National Weather Service Key West FL
811 PM EDT Sun Sep 24 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0802 PM Tstm Wnd Gst 1 WSW Key West 24.55N 81.79W
09/24/2023 M54 MPH Monroe FL Official NWS Obs
A westerly wind gust of 47 kts, or 54 mph,
was recorded by the Florida Keys NWS RSOIS
at 8:02 PM EDT. Correction from previous
report to indicate it was a measured wind
gust.
&&
RossPreliminary Local Storm Report
National Weather Service Key West FL
813 PM EDT Sun Sep 24 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0803 PM Tstm Wnd Gst 2 E Key West 24.56N 81.75W
09/24/2023 M43 MPH Monroe FL ASOS
A west-southwest wind gust of 37 kts, or 43
mph, was recorded by the Key West
International Airport ASOS at 8:03 PM EDT.
&&
RossThe Key West radar (KBYX), 9 km away, was scanning. The volume nearest the first event began at 00:15 UTC.
1 thunderstorm wind. Local standard time, as filed.
A southwest wind gust of 59 mph was measured at Key West International Airport. Power outages affecting just over 1,500 customers were reported, mostly in the Marathon, FL vicinity.
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: 1142300.