Afternoon thunderstorms developed in the afternoon along the sea breeze and moved towards the interior. As outflow boundaries and sea breeze boundaries interacted a funnel cloud formed over Miami Dade County in a wall cloud.
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The episode as NWS MFL wrote it up.
Afternoon thunderstorms developed in the afternoon along the sea breeze and moved towards the interior. As outflow boundaries and sea breeze boundaries interacted a funnel cloud formed over Miami Dade County in a wall cloud.
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 Jul 11, 12:58 PM EST, 3 minutes earlier.
Area Forecast Discussion National Weather Service Miami FL 158 PM EDT Wed Jul 11 2018 .AVIATION... TSRA currently starting to develop along the east coast metro as expected. This will prevail through the next few hours until the east coast sea breeze moves into the interior. Included tempo groups to reflect gusty and erratic winds due to any outflow boundaries near the terminals this afternoon. Iso SHRA are starting to initiate across the west near APF, therefore, included the VCTS for APF at this time. Winds become light tonight with VFR conditions through the period. && .PREV DISCUSSION... /issued 1156 AM EDT Wed Jul 11 2018/ UPDATE... Latest satellite imagery shows tropical wave over the Central Bahamas moving westward gradually increasing the moisture content across the area. Precipitable water value in today's sounding is up to 1.7 inches revealing a more moist environment. As this wave moves closer, more instability will be over the area to allow another day of afternoon convection across S FL. Latest short-term guidance suggest better chance along the east coast with the sea breeze and gradually moving into the interior as the afternoon progresses. Adjusted the Pop forecast to reflect increase chance of storms along the east coast metro areas before moving into the interior and west coast for later in the afternoon. A few strong thunderstorms with gusty winds and waterspouts cant be ruled out, and locally heavy rainfall is also possible. Look for activity to develop midday close/just inland of east coast, then spread slowly southwestward with time, increasing in coverage over the interior. PREV DISCUSSION... /issued 740 AM EDT Wed Jul 11 2018/ AVIATION... Iso SHRA currently over the Atlantic waters will remain over the waters for the morning hours at this time. Better chance for a few SHRA in the vicinity of the terminals after 15Z. Expect east to southeast winds this afternoon with better chance of VCTS near the east terminals as seabreeze develops after 15Z- 17Z and WNW Gulf breeze after 17Z. Better TSRA coverage after 19Z, generally inland from TAF sites. Outflow boundaries will lead to erratic late day winds with potential for direct TSRA impacts. PREV DISCUSSION... /issued 418 AM EDT Wed Jul 11 2018/ DISCUSSION... Latest satellite water vapor loop shows an enhanced area of mid and upper level moisture over the Atlantic waters, pushing slowly towards South FLorida. Satellite derived PWAT depicts values between 1.8" and 2.0", slightly higher than that currently over the peninsula. Already a few lightning strikes have been detected, feeding off the instability created by the warm Atlantic waters. Areas along the immediate east coast metro may be affected by this isolated activity through mid morning. Otherwise, the rest of our CWA should remain dry for the next several hours. Similar to yesterday, light and variable winds exist, which will allow for sea breeze development late this morning or early afternoon. Short term models, including the HRRR and hi-res WRF, prog showers and thunderstorms to develop a couple miles inland from the coast, then propagate in random directions, depending on the interaction of storm outflow boundaries. Though the highest coverage of storms will likely exist over the interior, isolated activity could be possible elsewhere. Model forecast 500 mb temps are between -8 to -9 C, cold enough to allow for a good CAPE profile and healthy updrafts. Some of the stronger storms this afternoon could produce gusty downdraft winds to around 45 mph, heavy rain causing ponding of water on the roadways, and small hail. Maximum temperatures are forecast to reach the upper 80s along the east coast metro and lower 90s inland and along the Gulf coast, which is about average for this time of year. By this evening, with the loss of diurnal heating, activity will wane. As is typical of a summer night with light southeast flow, instability over the Atlantic may lead to the redevelopment of isolated shower and thunderstorm activity over the local Atlantic coastal waters. Thursday into this weekend: A rather active weather pattern is anticipated for the next several days. Mid range models depict an area of cool area aloft, 500 mb temps -8C to -10C, continuing to spread over our region from the southeast. This, combined with PWAT values near 2.0", should allow for additional diurnally driven showers and thunderstorms across much of the peninsula. The focus will then shift back over the coastal waters after sun down. Although warmer air aloft moves over our CWA this weekend, enough moisture will exist for more diurnally driven showers and thunderstorms. Maximum temperatures across the region are forecast in the low 90s, near average for this time of year. Heat index values from Friday through this weekend will likely reach 100 to 105 along the east coast metro and eastern interior and up to 107 along portions of the Gulf coast and western interior. MARINE... A weak ridge of high pressure will remain in place across the region through the weekend. A northerly swell from Tropical Storm Chris will bring 3 to 4 foot waves to the waters off the Palm Beach this morning, gradually subsiding this afternoon through Thursday. Showers and thunderstorms are possible each day across all local South Florida waters. AVIATION... Isold SHRA/TSRA over Atlc likely vcnty most east coast sites through remainder of overnight hours. Hard to pinpoint exact timing/impacts, so will leave at VCSH for now with potential for passing MVFR cigs/vsbys. A little stronger ESE flow today, with east coast seabreeze developing 15Z-17Z and WNW Gulf breeze after 17Z. Better TSRA coverage after 19Z, generally inland from TAF sites, though similar to yesterday, close enough that VCTS seems prudent for all sites through sunset. Outflow boundaries will lead to erratic late day winds with potential for direct TSRA impacts. BEACH FORECAST... A moderate risk of rip currents exists today on the Atlantic beaches due to the dwindling swell from Hurricane Chris. The threat will decrease this evening into Thursday as the feature moves further out into the Atlantic, away from the southeast CONUS. && .PRELIMINARY POINT TEMPS/POPS... West Palm Beach 76 91 76 91 / 20 40 20 30 Fort Lauderdale 78 91 78 91 / 30 40 20 40 Miami 78 91 78 91 / 30 50 20 40 Naples 76 92 76 93 / 20 30 10 40 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && AVIATION...67/MT
Hazardous Weather Outlook for South Florida National Weather Service Miami FL 1159 AM EDT Wed Jul 11 2018 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 120400- 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- 1159 AM EDT Wed Jul 11 2018 ...Moderate Risk of Rip Currents All Atlantic Beaches... ...Thunderstorms Possible for South Florida Through the Evening Hours... This hazardous weather outlook is for South Florida. .DAY ONE...THIS AFTERNOON AND TONIGHT Rip currents: Lingering swells from Hurricane Chris will continue to bring a moderate risk of rip currents along all Atlantic beaches today. Thunderstorms: Scattered to numerous thunderstorms are expected across South Florida today, especially during the afternoon and evening hours. Coverage will be highest over east coast and interior South Florida with late day boundary collisions. The main threat with any thunderstorms will be frequent cloud-to-ground lightning strikes and locally heavy rainfall. The strongest thunderstorms will be capable of producing gusty winds, small hail, and funnel clouds. Waterspouts: Isolated waterspouts are possible across all South Florida waters today. Wind: The strongest storms today will be capable of producing wind gusts in excess of 50 mph. Hail: The strongest storms today will be capable of producing small hail up to dime sized. Flooding: Slow moving and training storms will lead to the threat for flooding of streets and poor drainage areas. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY Scattered to numerous showers and thunderstorms are forecast each afternoon and evening across South Florida through the upcoming weekend. Lightning will be the main hazard. Conditions will remain favorable for a few strong storms with gusty winds and small hail through late week. Northeasterly swell from Hurricane Chris will continue to diminish as it moves further away in the open Atlantic. Elevated seas and a moderate risk of rip currents will linger along the Atlantic beaches through at least Thursday. .SPOTTER INFORMATION STATEMENT... Widespread spotter activation is not anticipated, however individual spotters are encouraged to report high wind, hail, funnel clouds, 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 201 PM EDT WED JUL 11 2018 FLZ073-074-111845- Metropolitan Miami Dade FL-Inland Miami-Dade County FL- 201 PM EDT WED JUL 11 2018 ...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL MIAMI-DADE COUNTY UNTIL 245 PM EDT... * At 201 PM EDT, National Weather Service meteorologists were tracking a strong thunderstorm over Tamiami, or near Kendall. This storm was nearly stationary. * Winds in excess of 45 mph possible with this storm. * Locations impacted include... Kendall, Doral, Sweetwater, Kendale Lakes, Tamiami, University Park, The Hammocks, Sunset, The Crossings, Fountainbleau, Olympia Heights, Kendall West, Tamiami Fairgrounds, Fiu South Campus and Westwood Lakes. 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. 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 2582 8037 2569 8036 2567 8045 2579 8049 TIME...MOT...LOC 1801Z 069DEG 1KT 2574 8042 67
The Miami radar (KAMX), 16 km away, was scanning. The volume nearest the first event began at 17:59 UTC.
1 funnel cloud. Local standard time, as filed.
NWS employees witness funnel cloud form out of rotating wall cloud just south of NWS Miami office. The funnel did not extend far out of the cloud.
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, July 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: 775341.