Slow moving airmass thunderstorms developed over Northeast New Jersey. They produced torrential rain, which led to flash flooding in Union and Essex counties.
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 OKX wrote it up.
Slow moving airmass thunderstorms developed over Northeast New Jersey. They produced torrential rain, which led to flash flooding in Union and Essex counties.
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 New York, NY wrote its last area forecast discussion before the first event at Aug 1, 6:42 AM EST, 2 hours 23 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NEW YORK NY 742 AM EDT SUN AUG 1 2010 .SYNOPSIS... A SERIES OF UPPER LEVEL DISTURBANCES WILL RESULT IN UNSETTLED WEATHER FOR THE START OF THE NEW WEEK. HOT AND HUMID WEATHER RETURNS FOR THE MID TO LATE-WEEK PERIOD. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... AN UPPER LEVEL TROUGH WILL APPROACH THE REGION TODAY...BRINGING AN INCREASE IN CLOUD COVER AND THE THREAT OF SHOWERS. STRONG HIGH PRESSURE...EAST OF THE REGION WILL RESULT IN HIGHER POPS ACROSS THE WESTERN ZONES. WITH A COOL AND DAMP ONSHORE FLOW...IT WILL BE HARD FOR THUNDERSTORMS TO DEVELOP IN THIS AIRMASS...AND WILL NOT MENTION THUNDER UNTIL LATE AFTERNOON/EVENING. ANY STORMS THAT DO DEVELOP WILL BE ISOLATED. FOLLOWED A MAV/MET BLEND FOR HIGHS TODAY. TEMPERATURES ARE ONLY EXPECTED TO CLIMB INTO THE UPPER 70S TO NEAR 80. THE ONLY EXCEPTION WILL BE ACROSS THE NYC METRO...WHERE HIGHS WILL BE IN THE LOWER 80S. && .SHORT TERM /6 PM THIS EVENING THROUGH TUESDAY/... MODELS ARE IN DECENT AGREEMENT FOR THE START OF THE NEW WORK WEEK. HIGH PRESSURE WILL REMAIN OFF THE GULF OF MAINE BEFORE DEPARTING LATE TUESDAY. MEANWHILE...A SERIES OF TROUGHS AND MID-LEVEL SHORTWAVES WILL MOVE ACROSS THE REGION KEEPING UNSETTLED WEATHER IN THE FORECAST. WITH THE LOSS OF DIURNAL HEATING...POPS GRADUALLY TAPER DOWN TO CHANCE POPS SUNDAY NIGHT. ANOTHER UPPER TROUGH APPROACHES ON MONDAY...PRODUCING ANOTHER ROUND OF DIURNALLY DRIVEN SHOWERS AND ISOLATED THUNDERSTORMS. ONCE AGAIN THE MAIN FOCUS WILL BE OVER THE WESTERN ZONES. MOSTLY CLOUDY SKIES AND SHOWERS...WILL KEEP TEMPS FROM CLIMBING TOO MUCH OUT OF THE UPPER 70S TO LOWER 80S. THE HIGH PRESSURE OFF THE GULF OF MAINE WILL DEPART ON TUESDAY. WINDS WILL SHIFT TO MORE OF A SOUTHERLY FLOW AS OPPOSED TO AN EAST-SOUTHEAST FLOW. THIS WILL USHER A WARMER AND MORE HUMID AIRMASS INTO THE REGION. HIGHS ON TUESDAY WILL WARM INTO THE LOW TO MID 80S ACROSS MUCH OF THE REGION... AND INTO THE MID TO UPPER 80S ACROSS THE NYC METRO. WITH SFC DEWPOINTS IN THE UPPER 60S TO AROUND 70...THE HEAT INDEX WILL CLIMB INTO THE LOWER 90S. && .LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/... A COLD FRONT APPROACHES FROM THE WEST WEDNESDAY...POSSIBLY REACHING THE WESTERN PORTIONS OF THE FORECAST AREA WEDNESDAY EVENING. MORE PROGRESSIVE GFS PUSHES THE FRONT THROUGH BY THURSDAY MORNING. ECMWF SLOWS DOWN THE FRONT OVER THE REGION...PUSHING IT THROUGH SLOWLY ON THURSDAY AND FINALLY OFFSHORE IN THE EVENING. CONTINUED CARRYING SLIGHT CHANCE TO CHANCE POPS WEDNESDAY...AND UPGRADED POPS TO SLIGHT CHANCE THURSDAY. HIGH PRESSURE BUILDS IN FROM THE WEST FRIDAY AND SATURDAY. HIGH TEMPERATURES EXPECTED TO BE IN THE UPPER 80S TO AROUND 90 WEDNESDAY AND THURSDAY...THEN IN THE LOW TO MID 80S FRIDAY AND SATURDAY. && .AVIATION /12Z SUNDAY THROUGH THURSDAY/... HIGH PRESSURE SLIDES JUST OFF THE COAST TODAY. AN APPROACHING SHORTWAVE WILL LIKELY HAVE SHRA ACTIVITY SPREADING EASTWARD INTO THE WESTERN TERMINALS BY THIS AFTERNOON. INSTABILITY/FORCING DOES NOT INSTILL ENOUGH CONFIDENCE FOR MENTION OF THUNDER...BUT ISOLATED CONVECTION POSSIBLE. MAINLY VFR CEILINGS AND VISIBILITIES THROUGH THE FORECAST PERIOD... BUT LOCAL MVFR POSSIBLE IN SHRA ACTIVITY. SHRA ACTIVITY TAPERING OFF LATE THIS EVENING AS SHORTWAVE SLIDES EAST. LIGHT E/SE FLOW...WITH SUPERIMPOSED SEABREEZE THIS AFTERNOON. LIGHT ONSHORE FLOW TONIGHT. PATCHY GROUND FOG POSSIBLE LATE TONIGHT AT TERMINALS THAT SEE RAIN TODAY. OUTLOOK FOR 12Z MONDAY THROUGH THURSDAY... MON-WED...SUB-VFR POSSIBLE IN SCT DIURNAL CONVECTION. THU...VFR. && .MARINE... SUB SCA CONDITIONS EXPECTED THROUGH TUE...WITH A GENERALLY LIGHT SE/S FLOW WITH HIGH PRES ANCHORED EAST OF NEW ENGLAND. SOUTHERLY FLOW PICKS UP TUES INTO WED AHEAD OF APPROACHING COLD FRONT. WINDS APPEAR TO REMAIN JUST BELOW SCA...BUT WITH INCREASINGLY LONG FETCH...MAY HAVE TO DEAL WITH SEAS BUILDING TO MARGINAL SCA LEVEL BY LATE WED/THU. THE FRONT WILL PASS THROUGH THE WATERS THURSDAY. HIGH PRESSURE BUILDS IN LATE IN THE WEEK...WITH SUBSIDING CONDS. && .HYDROLOGY... AREAL QPF OF 1/4 TO 1/2 INCH POSSIBLE THROUGH MON ACROSS NYC/NE NJ AND THE LOWER HUDSON VALLEY AND LESS THAN 1/4 INCH QPF POSSIBLE OVER CT AND LONG ISLAND. LOCALLY HIGHER AMOUNTS POSSIBLE IN SLOW MOVING THUNDERSTORMS. && .CLIMATE... BASED ON PRELIM CLIMATE DATA...JULY 2010 IS THE SECOND WARMEST MONTH EVER RECORDED AT CPK...WITH AN AVERAGE TEMP OF 81.3 DEGREES. && .OKX WATCHES/WARNINGS/ADVISORIES... CT...NONE. NY...NONE. NJ...NONE. MARINE...NONE. && SYNOPSIS...BC NEAR TERM...BC SHORT TERM...BC LONG TERM...KCS AVIATION...NV MARINE...NV HYDROLOGY...BC CLIMATE...NV
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NEW YORK NY 320 AM EDT SUN AUG 1 2010 CTZ005>012-NJZ002>006-011-NYZ067>081-020730- NORTHERN FAIRFIELD-NORTHERN NEW HAVEN-NORTHERN MIDDLESEX- NORTHERN NEW LONDON-SOUTHERN FAIRFIELD-SOUTHERN NEW HAVEN- SOUTHERN MIDDLESEX-SOUTHERN NEW LONDON-WESTERN PASSAIC-BERGEN- EASTERN PASSAIC-ESSEX-HUDSON-UNION-ORANGE-PUTNAM-ROCKLAND- NORTHERN WESTCHESTER-SOUTHERN WESTCHESTER-NEW YORK (MANHATTAN)-BRONX- RICHMOND (STATEN ISLAND)-KINGS (BROOKLYN)-QUEENS-NASSAU- NORTHWESTERN SUFFOLK-NORTHEASTERN SUFFOLK-SOUTHWESTERN SUFFOLK- SOUTHEASTERN SUFFOLK- 320 AM EDT SUN AUG 1 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHERN CONNECTICUT...NORTHEAST NEW JERSEY AND SOUTHEAST NEW YORK. .DAY ONE...TODAY AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME THAT WOULD MEET NATIONAL WEATHER SERVICE WARNING CRITERIA. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. && THIS HAZARDOUS WEATHER OUTLOOK PROVIDES A SUMMARY OF POTENTIAL WIDESPREAD HAZARDOUS WEATHER EVENTS THAT MAY REACH NWS WARNING CRITERIA. MOST LONG FUSED NWS WATCHES...WARNINGS AND ADVISORIES IN EFFECT ARE HIGHLIGHTED. PLEASE REFER TO THE LATEST NWS FORECASTS FOR WEATHER NOT MEETING NWS WARNING CRITERIA. ANZ330-335-338-340-345-350-353-355-020730- LONG ISLAND SOUND EAST OF NEW HAVEN CT/PORT JEFFERSON NY- LONG ISLAND SOUND WEST OF NEW HAVEN CT/PORT JEFFERSON NY- NEW YORK HARBOR-PECONIC AND GARDINERS BAYS- SOUTH SHORE BAYS FROM JONES INLET THROUGH SHINNECOCK BAY- MORICHES INLET NY TO MONTAUK POINT NY OUT 20 NM- FIRE ISLAND INLET NY TO MORICHES INLET NY OUT 20 NM- SANDY HOOK NJ TO FIRE ISLAND INLET NY OUT 20 NM- 320 AM EDT SUN AUG 1 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME THAT WOULD MEET NATIONAL WEATHER SERVICE WARNING CRITERIA. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. && THIS HAZARDOUS WEATHER OUTLOOK PROVIDES A SUMMARY OF POTENTIAL WIDESPREAD HAZARDOUS WEATHER EVENTS THAT MAY REACH NWS WARNING CRITERIA. MOST LONG FUSED NWS WATCHES...WARNINGS AND ADVISORIES IN EFFECT ARE HIGHLIGHTED. PLEASE REFER TO THE LATEST NWS FORECASTS FOR WEATHER NOT MEETING NWS WARNING CRITERIA.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
911 AM EDT SUN AUG 1 2010
NJZ005-011-011415-
ESSEX-UNION-
911 AM EDT SUN AUG 1 2010
...DEVELOPING THUNDERSTORMS WILL IMPACT ESSEX AND UNION COUNTIES...
AT 905 AM EDT...SATELLITE IMAGERY AND NATIONAL WEATHER SERVICE
DOPPLER RADAR INDICATED THAT THUNDERSTORMS WERE RAPIDLY DEVELOPING
NEAR MILLBURN...AND MOVING NORTH AT 5 MPH.
WINDS UP TO 40 MPH ARE EXPECTED WITH THESE STORMS. IN ADDITION...VERY
HEAVY RAIN...WITH RAINFALL RATES OF UP TO 2 INCHES AN HOUR...IS
OCCURRING WITH THESE STORMS. THIS COULD CAUSE PONDING OF WATER ON
ROADWAYS... AND MINOR FLOODING OF POOR DRAINAGE AREAS.
LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN
HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. MOVE
TO SAFE SHELTER IMMEDIATELY.
LAT...LON 4074 7438 4078 7438 4083 7434 4085 7419
4083 7417 4060 7421 4061 7444 4063 7441
4065 7441 4065 7444 4069 7444
SMITHSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
953 AM EDT SUN AUG 1 2010
NJZ011-NYZ074-011500-
RICHMOND (STATEN IS.)-UNION-
953 AM EDT SUN AUG 1 2010
...STRONG THUNDERSTORM WILL IMPACT RICHMOND (STATEN ISLAND) AND UNION
COUNTIES...
AT 951 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR PORT READING...OR NEAR CARTERET...AND MOVING
SOUTHEAST AT 10 MPH.
FREQUENT CLOUD TO GROUND LIGHTNING...AND WINDS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM. IN ADDITION...VERY HEAVY RAIN...WITH
RAINFALL RATES OF UP TO 2 INCHES AN HOUR...IS OCCURRING WITH THIS
STORM. THIS COULD CAUSE PONDING OF WATER ON ROADWAYS... AND FLOODING
OF POOR DRAINAGE AREAS.
LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN
HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. MOVE
TO SAFE SHELTER IMMEDIATELY.
LAT...LON 4055 7424 4057 7421 4059 7421 4058 7430
4059 7431 4059 7436 4063 7441 4071 7433
4071 7428 4068 7415 4064 7416 4066 7407
4060 7405 4053 7416 4050 7424
SMITHThe Philadelphia radar (KDIX), 80 km away, was scanning. The volume nearest the first event began at 14:05 UTC.
2 flash flood. Local standard time, as filed.
Route 28 was closed in both directions in Cranford due to flooding.
The exit ramp was closed on Interstate 280 eastbound at exit 9 in West Orange due to flooding.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New Jersey in 2010Every state in 2010This day in weather historyWarnings in New Jersey, August 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: 256880, 256881.