A lingering stalled frontal boundary near Lake Okeechobee aided in the development of another day of scattered afternoon showers and storms across the region. Stronger storms that developed with boundary interactions across Palm Beach County produced small hail.
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 lingering stalled frontal boundary near Lake Okeechobee aided in the development of another day of scattered afternoon showers and storms across the region. Stronger storms that developed with boundary interactions across Palm Beach County produced small hail.
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 Apr 24, 12:58 PM EST, 1 hour 48 minutes earlier.
Area Forecast Discussion National Weather Service Miami FL 158 PM EDT Tue Apr 24 2018 .AVIATION... Showers and thunderstorms are developing N/W of terminals this afternoon and will likely spread east and impact in the vicinity of terminals from 19z through at least early evening. Will likely need to add TEMPO groups as timing/coverage confidence increases,especially for PBI and Broward sites. Atlantic breeze could temporarily turn winds SSE at KFLL and possible other sites, but generally SW wind 10 KT will prevail. Cold front passes tonight, turning winds to NW at 5 - 10 KT, which will continue into Wednesday as skies clear. && .PREV DISCUSSION... /issued 1101 AM EDT Tue Apr 24 2018/ UPDATE... Showers are beginning to develop over Hendry and Glades counties, and this activity is likely to become stronger and more numerous into the afternoon as it moves eastward toward Palm Beach County. CAMs depict widespread convection over and near Palm Beach County, then diminishing coverage and intensity to the south and west, with no precipitation close to the Gulf Coast. Have adjusted POPs accordingly, raising risk over Palm Beach County and lowering it in the S/W. 12Z RAOB analysis shows evolving unstable atmosphere, with plenty of cold air aloft to support some strong thunderstorms. Feel that northeast parts of South Florida could have near-severe wind gusts and some hail, isolated in nature. Will also have to monitor for a potential Atlantic breeze development, which would lead to backed winds, much enhanced shear and potential for an isolated tornado. This still appears unlikely but potential appears to have increased slightly from earlier guidance. Also, decreased cloud cover this morning, otherwise no changes to previous forecast. PREV DISCUSSION... /issued 334 AM EDT Tue Apr 24 2018/ DISCUSSION... TODAY: Slow moving upper level low that has been driving our weather the past few days continues to gradually meander northeastwards across the TN and OH valleys this morning. Satellite derived PWATs trace out the path of its associated surface front quite well, with a sharp demarcation between the 1.6-1.7" values across south and eastern Florida and the 0.5-1" values across the Panhandle and northeastern Gulf. Timing is consistent between models in bringing the front into South Florida just after midday. Before then, expect most land areas to remain fairly dry, other than a rouge shower or two, with most activity over the waters. Several factors come together in addition to the front's arrival for another fairly active afternoon across South Florida. Temperatures aloft remain cool, around -9 to -10C, contributing to steep lapse rates as surface temperatures will climb back into the mid to upper 80s and low 90s. We are expected to remain in the moist sector through this afternoon, with values well above normal. 80-90kt upper level jet and vort max are expected to dip far enough south to give upper level support to any development. Potential for weak Atlantic seabreeze development will also aide surface convergence. Best coverage should favor Lake Okeechobee and the east coast, following the best surface convergence, through the afternoon and early evening hours. Lightning and heavy rain remain the biggest threats, though strong wind gusts, hail, and potential for waterspouts/landspouts can't be ruled out given the environment. TONIGHT: Upper level low is expected to weaken and merge into the larger trough overnight, bringing its accompanying surface low up the east coast. As the main axis of the upper trough moves east of the state, it should drive the surface front south of the area, leaving only a few lingering showers across the local Atlantic waters by daybreak Wednesday. WEDNESDAY AND THURSDAY: A few days of dry weather are expected behind the front for midweek. No appreciable change in highs temperatures are expected, with values continuing in the mid to upper 80s both days. Lower humidities will allow cooler overnight lows ranging from the upper 50s over the interior and mid to upper 60s along the coasts. FRIDAY INTO NEXT WEEKEND: Larger east coast trough is expected to continue to dominate the pattern into the extended. Several shortwaves are expected to rotate around its base through the Northern Gulf coast/Deep South, potentially driving the development of another weak surface low and some manner of front that slides down the FL peninsula this weekend. Over South Florida, we look to see a gradual increase in moisture from south to north as the old frontal boundary drifts back into the region. Expect the threat for showers to return to the forecast, potentially lingering through most of the weekend depending on the exact evolution of the features further to our north. Daytime highs look to remain the same, with overnight lows gradually warming back into the 60s and low 70s. MARINE...Moderate south-southwest winds today as a frontal boundary makes its way through the region, veering west-northwest by daybreak behind the boundary. Expect west-northwest winds around 10kts to linger into the upcoming weekend. Speeds will be light enough to generally allow the Atlantic seabreeze to develop near the coast each afternoon, bringing winds out of the south-southeast. Showers and storms will be numerous again this afternoon, especially across Lake Okeechobee and the local Atlantic. Drier conditions are expected through midweek, with a few showers returning to the forecast by the upcoming weekend. && .PRELIMINARY POINT TEMPS/POPS... West Palm Beach 66 84 67 82 / 30 0 10 0 Fort Lauderdale 70 86 69 86 / 30 10 0 0 Miami 70 85 69 86 / 20 10 0 0 Naples 67 81 64 81 / 10 10 0 0 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && UPDATE...23/SK DISCUSSION...88/ALM MARINE...88/ALM AVIATION...23/SK
Hazardous Weather Outlook for South Florida National Weather Service Miami FL 1210 PM EDT Tue Apr 24 2018 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 250415- 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- 1210 PM EDT Tue Apr 24 2018 ...MARGINAL RISK OF SEVERE THUNDERSTORMS NORTHEAST... ...WATERSPOUTS POSSIBLE ATLANTIC WATERS AND LAKE OKEECHOBEE... This hazardous weather outlook is for South Florida. .DAY ONE...THIS AFTERNOON AND TONIGHT Thunderstorms: Thunderstorms are likely this afternoon and evening, mainly north and east of the Gulf Coast. Frequent lightning is expected. A few thunderstorms will be strong, and isolated severe thunderstorms with damaging winds and large hail are possible, especially over Palm Beach County, Lake Okeechobee, and the Fort Lauderdale metropolitan area. Waterspouts: Waterspouts are possible on Atlantic waters and Lake Okeechobee. Wind: Some thunderstorms will become strong with very gusty winds. A few thunderstorms, mainly north and east of a Belle Glade to Fort Lauderdale line, may become severe with damaging wind gusts of over 60 mph. Hail: Some thunderstorms will become strong with small hail. A few thunderstorms, mainly north and east of a Belle Glade to Fort Lauderdale line, may become severe with hail to the size of quarters. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated, but individual spotters are encouraged to report hail and high winds to the National Weather Service. For more information...visit the National Weather Service in Miami website at www.weather.gov/miami. KONARIK
Special Weather Statement National Weather Service Miami FL 324 PM EDT TUE APR 24 2018 FLZ067-068-168-242030- Coastal Palm Beach County FL-Inland Palm Beach County FL- Metro Palm Beach County FL- 324 PM EDT TUE APR 24 2018 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN PALM BEACH COUNTY UNTIL 430 PM EDT... * At 324 PM EDT, Doppler radar was tracking a cluster of strong thunderstorms near Lion Country Safari Park, or 12 miles west of Wellington, moving east at 10 mph. * Small hail and winds in excess of 45 mph will be possible with this storm. * Locations impacted include... West Palm Beach, Wellington, Jupiter, Palm Beach Gardens, Lake Worth, Riviera Beach, Palm Beach, Tequesta, Juno Beach, Greenacres, Royal Palm Beach, Palm Springs, North Palm Beach, Lantana, Lake Park, Atlantis, Haverhill, Cloud Lake, Palm Beach International Airport and Port Of Palm Beach. 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. This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. 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 2657 8003 2666 8060 2690 8051 2696 8004 TIME...MOT...LOC 1924Z 268DEG 8KT 2673 8044 JT
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MIAMI FL
344 PM EDT TUE APR 24 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0312 PM MARINE TSTM WIND 2 SE TEQUESTA 26.94N 80.07W
04/24/2018 M40 MPH AMZ650 FL MESONET
A THUNDERSTORM PRODUCED A WIND GUST OF 40 MPH AT THE
JUPITER INLET LIGHTHOUSE.
&&
EVENT NUMBER MFL1800069
CWCThe Miami radar (KAMX), 114 km away, was scanning. The volume nearest the first event began at 19:44 UTC.
1 hail. Local standard time, as filed.
A trained weather spotter reported dime sized hail at the intersection of I-95 and Ocean Ave in Lantana. Additional reports of pea sized hail were received in the vicinity.
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, April 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: 750560.