An upper level low pressure area over Florida and moist southwest wind flow led to the development of showers and thunderstorms across much of South Florida during the afternoon hours.
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The episode as NWS MFL wrote it up.
An upper level low pressure area over Florida and moist southwest wind flow led to the development of showers and thunderstorms across much of South Florida 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 Sep 8, 2:45 PM EST, 49 minutes earlier.
Area Forecast Discussion National Weather Service Miami FL 345 PM EDT Sat Sep 8 2018 .DISCUSSION... Scattered showers and thunderstorms have developed across South Florida this afternoon. Most of the showers and thunderstorms will begin to diminish later this evening. There will be some lingering showers during the overnight hours over the west coast areas as well as the Gulf and Atlantic waters. Low temperatures will range from the lower 70s across the northwestern interior sections to the upper 70s across the east coast metro areas. The south to southwesterly flow will continue on Sunday on the back side of the trough as it continues to move into the central Gulf of Mexico. Low level moisture will still be high enough during the day on Sunday to support scattered showers and thunderstorm development. The greatest coverage will be located near the Lake Okeechobee region during the afternoon due to the south to southwesterly flow continuing. On Sunday night, both of the GFS and the ECMWF continue to show significant drying taking place from south to north. This will help to decrease the chances of showers and thunderstorms during this time frame. The drier air mass will remain in place on Monday as well. Chances of showers and thunderstorms on Monday will remain at 20 to 30 percent, which is still below climatological normals for this time of year. On Tuesday and through the end of the week, the ridge of high pressure will begin to build back into the region from the western Atlantic. This will allow for a typical summertime pattern to return as an east to southeasterly wind flow builds back into South Florida as well. Convection will be sea breeze driven which will allow for the greatest chances of showers and thunderstorms to be focused over the interior and west coast sections during the afternoon hours. High temperatures will be right around normal for this time frame as they will rise into the upper 80s across the east coast metro areas to the lower 90s across the interior and west coast sections. && .MARINE... A south to southwesterly wind flow will continue through Sunday across the Atlantic and Gulf coastal waters with wind speeds between 5 and 10 knots. An area of high pressure will start to build back into the local waters on Monday which will help to shift the wind flow back to the east southeast. Seas will generally remain at 2 feet or less through Tuesday. Scattered showers and thunderstorms are expected each day across the Atlantic and Gulf waters. Winds and waves could be locally higher in and around any shower or thunderstorm. && .BEACH FORECAST... TC FLORENCE IMPACTS: Quite a bit early to discuss impacts from TC Florence as the track is uncertain at this time. However if the current track holds or shifts southward, swell will begin to impact the east coast of Florida beginning late Tuesday and especially Wednesday into next weekend. Expect a high risk of rip currents on the east coast beaches and a possibility of high surf across Palm Beach County beaches and minor beach erosion. Tides are running around 0.5 feet above normal and expected 1.1 to 1.2 feet above MHHW the next few days. Minor coastal flooding will be possible south of Marco island and Miami beach but not likely at this time but will need to be monitored over the next few days. && .PRELIMINARY POINT TEMPS/POPS... West Palm Beach 73 89 73 90 / 30 60 20 20 Fort Lauderdale 75 89 76 89 / 30 50 20 20 Miami 74 89 74 89 / 30 40 10 20 Naples 74 88 74 89 / 40 40 20 20 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && DISCUSSION...55/CWC MARINE...55/CWC BEACH FORECAST...55/CWC
Hazardous Weather Outlook for South Florida...UPDATED National Weather Service Miami FL 1019 AM EDT Sat Sep 8 2018 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 090000- 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- 1019 AM EDT Sat Sep 8 2018 ...FEW STRONG STORMS POSSIBLE INTERIOR/EAST COAST AFTERNOON INTO EVENING... ...ISOLATED WATERSPOUTS POSSIBLE ATLANTIC AND BISCAYNE BAY WATERS... This hazardous weather outlook is for South Florida. .DAY ONE...TODAY AND TONIGHT Lightning: Scattered to numerous thunderstorms are forecast for South Florida today with best chances across interior and east coast metro areas. Main concerns will be frequent lightning strikes, brief periods of heavy rain, and gusty winds. Flooding: Ponding of water on roadways of low lying and poor drainage areas is a possibility particularly this afternoon and early evening. Best chances of this happening is across interior and portion of east coast metro areas. Wind: Strongest storms will be capable of producing wind gusts in excess of 50 mph particularly across interior and portions of east coast. Waterspout: Isolated waterspouts will be possible over the Atlantic and Biscayne Bay waters. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY Tropical Storm Florence will be approaching the U.S. east coast towards the middle to latter part of next week. Potential impacts for South Florida include increasing risk of high surf resulting in a high risk of rip currents, the potential for minor to moderate beach erosion, and minor coastal flooding particularly for the northern most beaches of palm beach county. However, that concern could spread farther south depending on the ultimate track of the storm. So continue to monitor this information over the coming week. Otherwise afternoon and evening scattered showers and thunderstorms will continue to prevail through the period. .SPOTTER INFORMATION STATEMENT... Widespread spotter activation is not anticipated, however individual spotters are encouraged to report high wind 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. Baxter
Special Weather Statement National Weather Service Miami FL 430 PM EDT SAT SEP 8 2018 FLZ173-174-082115- Far South Miami-Dade County FL-Coastal Miami Dade County FL- 430 PM EDT SAT SEP 8 2018 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL MIAMI-DADE COUNTY UNTIL 515 PM EDT... * At 429 PM EDT, the public reported a strong thunderstorm near Florida City, or near Homestead Miami Speedway. This storm was nearly stationary. * Funnel clouds possible with this storm. * Locations impacted include... Homestead, Homestead Miami Speedway, Florida City and Homestead Base. 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 this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. 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. Funnel clouds occasionally touch down and produce tornadoes or waterspouts. Move indoors and stay away from windows. 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 2533 8048 2543 8050 2550 8040 2539 8033 TIME...MOT...LOC 2029Z 248DEG 3KT 2540 8045 AR
The Miami radar (KAMX), 23 km away, was scanning. The volume nearest the first event began at 20:34 UTC.
1 funnel cloud. Local standard time, as filed.
A funnel cloud was spotted about halfway to the ground near US 1 about 2 miles south of Florida City.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2018Every state in 2018This day in weather historyWarnings in Florida, September 2018
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: 787853.