New Jersey, 1999

Heavy Rain in New Jersey, August 13 to 14, 1999

August 13 to 14, 1999 · NWS PHI · 3 events in 3 counties and zones

In addition to the frequent lightning, the thunderstorms that rumbled through the Raritan Valley around midnight EDT on the 14th brought heavy rain with them, most of which fell within two hours. Storm totals ranged from one to three inches with the highest amounts in southern sections of Hunterdon, Somerset and Middlesex Counties.

Where it happened

Every event with a place to put it; 3 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
3

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.

What happened

The episode as NWS PHI wrote it up.

In addition to the frequent lightning, the thunderstorms that rumbled through the Raritan Valley around midnight EDT on the 14th brought heavy rain with them, most of which fell within two hours. Storm totals ranged from one to three inches with the highest amounts in southern sections of Hunterdon, Somerset and Middlesex Counties. This was the heaviest and most widespread rain event in the area since May 24th and started to chip away at the drought. Heavy rain spread into the Raritan Valley and reached Hunterdon County first around 11 p.m. EDT on the 13th and exited southern Middlesex County by 3 a.m. EDT on the 14th. The rain caused the usual poor drainage flooding problems. Storm totals included 3.12 inches in Lambertville (Hunterdon County), 2.60 inches in Hillsborough (Somerset County), 2.07 inches in Belle Mead (Somerset County), 2.03 inches in Neshanic (Somerset County), 2.01 inches in Wertsville (Hunterdon County), 1.68 inches in White House Station (Hunterdon County), 1.66 inches in Flemington (Hunterdon County), 1.64 inches in Somerville (Somerset County), 1.61 inches in New Brunswick (Middlesex County) and 1.27 inches in Watchung (Somerset County).

The radar

The national radar mosaic for the moment the first event began.

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Event by event

3 heavy rain. Local standard time, as filed.

Heavy Rain, Hunterdon

When
August 13, 10:00 PM EST to August 14, 12:00 AM EST
Where
Hunterdon County, Countywide
Reported by
AWOS,ASOS,MESONET,ETC
Coordinates
40.567, -74.912 (the zone’s center; the record gives no point)

Heavy Rain, Somerset

When
August 13, 10:30 PM EST to August 14, 12:00 AM EST
Where
Somerset County, Countywide
Reported by
AWOS,ASOS,MESONET,ETC
Coordinates
40.564, -74.616 (the zone’s center; the record gives no point)

Heavy Rain, Middlesex

When
August 13, 11:00 PM EST to August 14, 2:00 AM EST
Where
Middlesex County, Countywide
Reported by
AWOS,ASOS,MESONET,ETC
Coordinates
40.440, -74.409 (the zone’s center; the record gives no point)

What these are

Heavy Rain
Rainfall totals unusual for the place and season that did not produce a flood.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in New Jersey in 1999Every state in 1999This day in weather historyWarnings in New Jersey, August 1999

Sources

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: 5717972, 5717974, 5717973.