Deep moisture ahead of an unseasonable cold front over North Florida produced widespread showers and thunderstorms over South Florida on July 4th.
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.
Deep moisture ahead of an unseasonable cold front over North Florida produced widespread showers and thunderstorms over South Florida on July 4th.
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 4, 8:57 AM EST, 4 hours 4 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE MIAMI FL 957 AM EDT SUN JUL 4 2010 ...MOTHER NATURE PUTTING ON FIREWORKS SHOW THIS AFTERNOON INTO EARLY THIS EVENING... ...LOCALLY HEAVY RAINFALL POSSIBLE ACROSS SOUTH FLORIDA THIS AFTERNOON INTO EARLY THIS EVENING... .UPDATE... A TROUGH OF LOW PRESSURE WAS LOCATED OVER THE WESTERN ATLANTIC WATERS EXTENDING SOUTHWEST INTO CENTRAL FLORIDA THIS MORNING...WITH A STATIONARY SURFACE FRONT OVER THE SAME AREA. THESE TWO FEATURES WILL REMAIN NEARLY STATIONARY TODAY ALLOWING FOR A SOUTHWEST STEERING FLOW OVER THE CWA...AND ALLOW FOR THE WEST COAST SEA BREEZE TO PUSH ACROSS THE CWA KEEPING THE EAST COAST SEA BREEZE NEAR THE EAST COAST AREAS. AT THE SAME TIME...THE CLOUDS OVER SOUTH FLORIDA ARE STARTING TO BREAK APART THIS MORNING WHICH WILL ALLOW FOR HEATING TO OCCUR AND MAKE THE ATMOSPHERE UNSTABLE. SO KEEP THE POPS AT LIKELY OVER MOST OF THE CWA. TODAY..BUT RAISE THE POPS TO CATEGORICAL OVER THE LAKE OKEECHOBEE AREA AND THE NORTHEAST AREAS OF THE CWA TODAY. THE PWAT VALUES FROM THE 12Z MIAMI SOUNDING THIS MORNING WAS ALSO RUNNING AROUND 2.2 INCHES. THE LATEST SHORT RANGE MODELS ARE SHOWING THAT THE PWAT VALUES WILL INCREASE TO AROUND 2.3 INCHES THIS AFTERNOON WHICH IS 2+ STANDARD DEVIATIONS ABOVE THE NORMAL 1.8 INCHES FOR THIS TIME OF YEAR. SO WILL KEEP THE LOCALLY HEAVY RAINFALL IN THE ZONES FOR TODAY INTO THIS EVENING. THERE COULD EVEN BE SOME STRONG STORMS OVER THE INTERIOR AND EAST COAST METRO AREAS THIS AFTERNOON INTO THIS EARLY EVENING...AS THERE WAS ALSO A LOW LEVEL JET OF 20 TO 25 KNOTS MOVING THROUGH THE AREA. SO WILL ADDED GUSTY WINDS TO THE INTERIOR AND EAST COAST AREAS FOR THIS AFTERNOON INTO THIS EARLY THIS EVENING. THE STORMS SHOULD START TO DISSIPATE AROUND SUNSET AS THE HEATING OF THE DAY IS LOST. THEREFORE...WILL KEEP A 50 PERCENT CHANCE OF STORMS OVER THE EAST COAST METRO AREAS TAPERING DOWN TO 30 PERCENT OVER THE WEST COAST AREAS FOR THE EARLY EVENING HOURS. REST OF THE FORECAST LOOKS GOOD AT THIS TIME AND NO OTHER CHANGES ARE PLAN. && .UPDATE...54/BNB .PREV DISCUSSION... /ISSUED 734 AM EDT SUN JUL 4 2010/ AVIATION...FOR THE SHORT TERM...VFR CONDITIONS WILL PREVAIL. WITH COPIOUS MOISTURE ACROSS THE REGION...CONVECTION EXPECTED TO START AROUND 15Z WITH VCTS ASSIGNED FOR ALL TERMINALS. FOR NOW TEMPO GROUP FOR TSRA ASSIGNED ALL TERMINALS FROM 15Z TO 19Z...WITH PERIODS OF SUB-VFR CONDITIONS POSSIBLE AND LIMITED PERIODS OF IFR CONDITIONS POSSIBLE. THE 18Z TAFS OR SHORT TERM AMENDMENTS CAN GIVE BETTER TIMING OF CONVECTION AND VIS RESTRICTIONS. && DISCUSSION...WEAK FRONTAL BOUNDARY OVER SOUTH CENTRAL FLORIDA WILL MOVE NORTH TODAY WITH WEAK SURFACE HIGH PRESSURE BUILDING BACK IN FROM THE ATLANTIC. BUT MOISTURE WILL STILL BE ABUNDANT WITH THE ATMOSPHERE UNSTABLE AND PWAT'S NEAR 2.3 INCHES. MAINLY LIKELY POPS CAN BE EXPECTED TODAY AND MONDAY AND ONLY CHANCE CATEGORY TUESDAY ON. THERE IS LOW CONFIDENCE IN THE WEATHER PATTERN AND THEREFORE THE WIND PATTERN TUE NIGHT THROUGH WEDNESDAY. THIS IS DUE TO CHGS IN THE GFS40 AND NAM12 MODELS SINCE 24 HRS AGO. LAST NIGHTS MODELS HAD A LOW DEVELOP AND MOVE NORTH TOWARDS THE CAROLINAS. TONIGHT'S NAM12 SHOWS DEVELOPMENT OF A LOW EAST OF THE NORTHERN BAHAMAS MONDAY AND MOVES IT NORTHWEST THROUGH WEDNESDAY AND COULD SEND THE FRONTAL BOUNDARY BACK DOWN INTO OUR AREA. BUT THE GFS40 MODEL SHOWS WEAK DEVELOPMENT ROUGHLY IN THE SAME AREA AND MOVES THE LOW WEST TOWARDS SOUTH FLORIDA BUT OPENS IT UP INTO A TROUGH AND MOVES IT THROUGH THE AREA ON WEDNESDAY. SINCE THE ECMWF ROUGHLY SHOWS THIS SAME SCENARIO, AM LEANING MORE TOWARDS THE GFS40 WEATHER PATTERN AND WIND FIELDS. EXPECT HIGH END CHANCE POPS ON WEDNESDAY DUE TO TROUGH. AFTER THE TROUGH MOVES THROUGH WEDNESDAY, MID LEVEL HEIGHTS BUILD OVER THE AREA AND THE ATMOSPHERE DRYS OUT WITH PWAT'S FALLING BELOW 2" THROUGH THE EARLY PART OF NEXT WEEKEND. POPS WILL BE ONLY AROUND 40 PERCENT FOR THE AFTERNOON AND EARLY EVENING PERIODS. MARINE...A LIGHT PRESSURE GRADIENT WILL REMAIN ACROSS THE AREA THROUGH THE PERIOD WITH WIND SPEEDS AT 15 KTS OR LESS AND GENERALLY EAST TO SOUTHEAST DIRECTIONS. THIS WILL KEEP SEAS LESS THAN 4 FEET THROUGH THE PERIOD. FIRE WEATHER...NO PROBLEMS OR CONCERNS. && .PRELIMINARY POINT TEMPS/POPS... WEST PALM BEACH 88 76 88 75 / 80 50 70 30 FORT LAUDERDALE 88 77 88 77 / 70 50 70 30 MIAMI 88 76 89 77 / 70 40 60 30 NAPLES 87 74 88 75 / 60 30 70 30 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...NONE. AM...NONE. GM...NONE. && LONG TERM...18/GR SHORT TERM/AVIATION...60/BD
HAZARDOUS WEATHER OUTLOOK FOR SOUTH FLORIDA...UPDATED NATIONAL WEATHER SERVICE MIAMI FL 852 AM EDT SUN JUL 4 2010 FLZ063-066>075-168-172>174-050400- 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- 852 AM EDT SUN JUL 4 2010 ...BECOMING WET AND STORMY THIS AFTERNOON/EARLY EVENING... ...HEAVY RAINFALL AND GUSTY WINDS IN THE STRONGEST STORMS... THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH FLORIDA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS: SHOWERS AND THUNDERSTORMS WILL DEVELOP ACROSS SOUTH FLORIDA THROUGH THE AFTERNOON HOURS BEFORE GRADUALLY DISSIPATING THIS EVENING. THE MAIN IMPACTS FROM THE STORMS WILL BE OCCASIONAL LIGHTNING STRIKES....HEAVY RAINFALL...AND GUSTY WINDS. FLOODING: THUNDERSTORMS WILL BE CAPABLE OF DUMPING 2 TO 4 INCHES OF RAIN IN A SHORT PERIOD OF TIME. THIS COULD RESULT IN LOCALIZED STREET FLOODING AND FLOODING OF LOW LYING AREAS THIS AFTERNOON INTO EARLY THIS EVENING. WIND: THE MID LEVEL WIND FLOW IS STRONGER TODAY OUT OF THE SOUTHWEST...AND THIS COULD RESULT IN WIND GUSTS OF UP TO 50 MPH IN THE STRONGER AND MORE ORGANIZED THUNDERSTORM ACTIVITY THAT DEVELOPS THIS AFTERNOON INTO EARLY THIS EVENING. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THERE IS A CHANCE OF MAINLY AFTERNOON AND EVENING THUNDERSTORMS ACROSS THE ENTIRE AREA THROUGH THE PERIOD. .SPOTTER INFORMATION STATEMENT... WIDESPREAD SPOTTER ACTIVATION IS NOT ANTICIPATED, HOWEVER INDIVIDUAL SPOTTERS ARE ENCOURAGED TO REPORT HIGH WIND, HAIL 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. GREGORIA
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
1244 PM EDT SUN JUL 4 2010
FLZ068-072-168-172-041715-
METRO PALM BEACH COUNTY FL-COASTAL PALM BEACH COUNTY FL-
METRO BROWARD COUNTY FL-COASTAL BROWARD COUNTY FL-
1244 PM EDT SUN JUL 4 2010
...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR FAR
NORTHEASTERN BROWARD COUNTY AND SOUTHEASTERN PALM BEACH COUNTY FOR
FREQUENT LIGHTNING...GUSTY WINDS TO AROUND 45 MPH AND POSSIBLE
FUNNEL CLOUDS...
AT 1238 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
DETECTED A STRONG THUNDERSTORM NEAR DEERFIELD BEACH...MOVING
NORTHEAST AT 5 MPH.
THIS STORM WILL AFFECT...
LIGHTHOUSE POINT...
DEERFIELD BEACH...
BOCA RATON...
AND SURROUNDING COMMUNITIES.
ALSO...THIS STORM IS SHOWING WEAK ROTATION...SO FUNNEL CLOUDS ARE
POSSIBLE.
STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES AND POSSIBLE WARNINGS.
LAT...LON 2638 8007 2629 8007 2627 8008 2625 8011
2632 8020 2648 8012 2644 8005 2639 8006
TIME...MOT...LOC 1642Z 217DEG 5KT 2629 8012
GREGORIASPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MIAMI FL 111 PM EDT SUN JUL 4 2010 FLZ073-041745- INLAND MIAMI-DADE FL- 111 PM EDT SUN JUL 4 2010 ...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR THE WEST KENDALL AND HAMMOCKS AREA FOR FREQUENT TO EXCESSIVE LIGHTNING AND GUSTY WINDS FROM 45 T0 55 MPH... AT 108 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE DETECTED A STRONG THUNDERSTORM NEAR THE HAMMOCKS...MOVING NORTHWEST AT 5 MPH. THIS STORM WILL AFFECT... THE HAMMOCKS... WEST KENDALL... KENDALE LAKES... INTERSECTION KROME AND KENDALL DRIVE... AND SURROUNDING COMMUNITIES. FREQUENT TO EXCESSIVE LIGHTNING...GUSTY WINDS FROM 45 T0 55 MPH...TORRENTIAL DOWNPOURS...OR A COMBINATION OF THESE ARE POSSIBLE. LIGHTNING IS THE NUMBER ONE WEATHER RELATED KILLER IN FLORIDA. TREES AND OPEN SHELTERS OFFER NO PROTECTION. 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. STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER DETAILS OR UPDATES. LAT...LON 2579 8049 2574 8039 2564 8042 2564 8060 TIME...MOT...LOC 1711Z 146DEG 3KT 2568 8046 GREGORIA
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
129 PM EDT SUN JUL 4 2010
FLZ072-172-041800-
METRO BROWARD COUNTY FL-COASTAL BROWARD COUNTY FL-
129 PM EDT SUN JUL 4 2010
...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR THE POMPANO
BEACH AREA FOR FREQUENT TO EXCESSIVE LIGHTNING...GUSTY WINDS FROM 45
T0 55 MPH...UP TO PENNY-SIZED HAIL...
AT 126 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE DETECTED
A STRONG THUNDERSTORM OVER POMPANO BEACH...MOVING EAST AT 5 MPH.
THIS STORM WILL AFFECT...
POMPANO BEACH...
LIGHTHOUSE POINT...
SEA RANCH LAKES...
AND SURROUNDING COMMUNITIES.
FREQUENT TO EXCESSIVE LIGHTNING...GUSTY WINDS FROM 45 T0 55 MPH...UP
TO NICKEL-SIZED HAIL...TORRENTIAL DOWNPOURS...OR A COMBINATION OF
THESE ARE POSSIBLE. LIGHTNING IS THE NUMBER ONE WEATHER RELATED
KILLER IN FLORIDA. TREES AND OPEN SHELTERS OFFER NO PROTECTION. 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.
RESIDENTS NEAR THE PATH OF THIS STORM SHOULD REMAIN ON THE ALERT FOR
ADDITIONAL STATEMENTS AND POSSIBLE WARNINGS.
STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES.
LAT...LON 2627 8008 2625 8008 2624 8009 2618 8010
2614 8010 2619 8019 2632 8017 2630 8007
2629 8007
TIME...MOT...LOC 1729Z 288DEG 6KT 2622 8012
GREGORIAPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MIAMI FL
157 PM EDT SUN JUL 04 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0150 PM HEAVY RAIN POMPANO BEACH 26.23N 80.12W
07/04/2010 E0.00 INCH BROWARD FL TRAINED SPOTTER
SPOTTER REPORTED LOCAL STREET FLOODING NEAR ATLANTIC BLVD
AND HWY A1A
&&
TMOSLEYPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MIAMI FL
200 PM EDT SUN JUL 04 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0155 PM HEAVY RAIN POMPANO BEACH 26.23N 80.12W
07/04/2010 E0.00 INCH BROWARD FL TRAINED SPOTTER
SPOTTER REPORTED STREET FLOODING AT SE 11 ST AND SE 15
AVE.
&&
TMOSLEYThe Miami radar (KAMX), 81 km away, was scanning. The volume nearest the first event began at 18:01 UTC.
1 lightning, 1 thunderstorm wind. Local standard time, as filed.
A boater was struck by lightning just east of Lighthouse Point. When the lightning struck the boat the antenna broke and shards of fiberglass shot into the boater's arm. The man was brought into a marina at Pompano Beach then taken to North Broward Medical Center, But did not appear to have serious injuries.
A passing thunderstorm at the North Palm Beach General Airport caused branches of two inches in diameter to break off. Winds were estimated at 40 to 50 knots.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2010Every state in 2010This day in weather historyWarnings in Florida, July 2010
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: 251873, 251087.