Excessive Heat in New Jersey, July 23 to 25, 2010

Name: Excessive Heat in New Jersey, July 23 to 25, 2010
Start: 2010-07-23T09:00
End: 2010-07-25T17:00
Location: New Jersey

July 23 to 25, 2010 · NWS PHI · 19 events in 19 counties and zones

The last heat wave in July culminated with some of the highest heat indices of the summer on the 24th and numerous high temperatures in the mid to upper 90s. | |The heat wave ended with strong to severe thunderstorms that preceded a strong cold frontal passage during the late afternoon of the 25th.

Where it happened

Every event with a place to put it; 19 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

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 19

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.

The last heat wave in July culminated with some of the highest heat indices of the summer on the 24th and numerous high temperatures in the mid to upper 90s. The combination of the heat and humidity produced heat index values of around 105 degrees on the 24th.| |The heat wave ended with strong to severe thunderstorms that preceded a strong cold frontal passage during the late afternoon of the 25th. Highest temperatures included 100 degrees in Margate (Atlantic County), 99 degrees at the Atlantic City International Airport (Atlantic County) and Somerdale (Camden County), 98 degrees in New Brunswick (Middlesex County), Berkeley Township (Ocean County), Sicklerville (Gloucester County) and Hillsborough (Somerset County), 97 degrees in Millville (Cumberland County), Marlboro (Monmouth County), Wrightstown (Burlington County) and Wildwood (Cape May County), 96 degrees in Trenton (Mercer County), 95 degrees in Boonton (Morris County) and Flemington (Hunterdon County) and 94 degrees in Swedesboro (Gloucester County) and Somerville (Somerset County).

The month of July was the second hottest July on record in New Jersey dating back to 1895. The monthly statewide mean temperature of 78.4 degrees was only surpassed by 79.0 degrees in 1955. It was the hottest July on record at the Atlantic City International Airport (monthly mean temperature of 79.8 degrees) and was tied with 1955 for the hottest July on record in Trenton (monthly mean temperature of 80.5 degrees). Trenton (21 days) established A new July record for the most days with temperatures of 90 degrees or higher.

What forecasters said that day

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 Philadelphia/Mount Holly wrote its last area forecast discussion before the first event at Jul 23, 3:32 AM EST, 5 hours 28 minutes earlier.

Area forecast discussion, Jul 23, 3:32 AM EST, 5 hours 28 minutes before

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Hazardous weather outlook, Jul 23, 2:30 AM EST, 6 hours 30 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
330 AM EDT FRI JUL 23 2010

NJZ015-019-PAZ067>071-240730-
MERCER-NORTHWESTERN BURLINGTON-CHESTER-MONTGOMERY-BUCKS-DELAWARE-
PHILADELPHIA-
330 AM EDT FRI JUL 23 2010

...EXCESSIVE HEAT WATCH IN EFFECT FROM SATURDAY MORNING THROUGH
SATURDAY EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW JERSEY...SOUTHERN
NEW JERSEY AND SOUTHEAST PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

THE STORM PREDICTION CENTER HAS PLACED THE AREA IN A SLIGHT RISK
FOR SEVERE THUNDERSTORMS FOR TODAY AND TONIGHT.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   EXCESSIVE HEAT WATCH.

INCREASING HEAT AND HUMIDITY IS EXPECTED TODAY AND ESPECIALLY SATURDAY.
HEAT INDEX VALUES MAY REACH OR EXCEED 105 DEGREES IN URBAN AREAS
SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

DEZ001-NJZ017-018-240730-
NEW CASTLE-GLOUCESTER-CAMDEN-
330 AM EDT FRI JUL 23 2010

...EXCESSIVE HEAT WATCH IN EFFECT FROM SATURDAY MORNING THROUGH
SATURDAY EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN DELAWARE AND
SOUTHERN NEW JERSEY.

.DAY ONE...TODAY AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   EXCESSIVE HEAT WATCH.

INCREASING HEAT AND HUMIDITY IS EXPECTED TODAY AND ESPECIALLY SATURDAY.
HEAT INDEX VALUES MAY REACH OR EXCEED 105 DEGREES IN URBAN AREAS
SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

NJZ001-007>010-012-PAZ060>062-240730-
SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-BERKS-LEHIGH-
NORTHAMPTON-
330 AM EDT FRI JUL 23 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW
JERSEY...NORTHWEST NEW JERSEY AND EAST CENTRAL PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

THE STORM PREDICTION CENTER HAS PLACED THE AREA IN A SLIGHT RISK
FOR SEVERE THUNDERSTORMS FOR TODAY AND TONIGHT.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

HEAT INDEX VALUES MAY REACH AROUND 105 DEGREES SATURDAY
AFTERNOON.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

PAZ054-055-240730-
CARBON-MONROE-
330 AM EDT FRI JUL 23 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

THE STORM PREDICTION CENTER HAS PLACED THE AREA IN A SLIGHT RISK
FOR SEVERE THUNDERSTORMS FOR TODAY AND TONIGHT.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

THE STORM PREDICTION CENTER HAS PLACED THE AREA IN A SLIGHT RISK
FOR SEVERE THUNDERSTORMS FOR SATURDAY.

HEAT INDEX VALUES MAY REACH AROUND 100 DEGREES SATURDAY
AFTERNOON.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED LATER TODAY AND AGAIN SATURDAY.

DEZ002>004-MDZ008-012-015-019-020-NJZ013-014-016-020>027-240730-
KENT-INLAND SUSSEX-DELAWARE BEACHES-CECIL-KENT MD-QUEEN ANNES-TALBOT-
CAROLINE-WESTERN MONMOUTH-EASTERN MONMOUTH-SALEM-OCEAN-CUMBERLAND-
ATLANTIC-CAPE MAY-ATLANTIC COASTAL CAPE MAY-COASTAL ATLANTIC-
COASTAL OCEAN-SOUTHEASTERN BURLINGTON-
330 AM EDT FRI JUL 23 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL DELAWARE...SOUTHERN
DELAWARE...NORTHEAST MARYLAND...CENTRAL NEW JERSEY AND SOUTHERN NEW
JERSEY.

.DAY ONE...TODAY AND TONIGHT.

IT WILL BE HOTTER AND MORE HUMID TODAY. HEAT INDEX VALUES MAY
REACH NEAR OR JUST OVER 100 DEGREES THIS AFTERNOON OVER SOUTHERN
NEW JERSEY CENTRAL AND SOUTHERN DELAWARE AND PORTIONS OF THE
NORTHEAST MARYLAND SHORE AWAY FROM THE OCEAN AND BAY.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

HEAT INDEX VALUES MAY REACH AROUND 105 DEGREES SATURDAY AFTERNOON.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

ANZ430-431-450>455-240730-
DELAWARE BAY WATERS NORTH OF EAST POINT NJ TO SLAUGHTER BEACH DE-
DELAWARE BAY WATERS SOUTH OF EAST POINT NJ TO SLAUGHTER BEACH DE-
COASTAL WATERS FROM SANDY HOOK TO MANASQUAN INLET NJ OUT 20 NM-
COASTAL WATERS FROM MANASQUAN INLET TO LITTLE EGG INLET NJ OUT 20 NM-
COASTAL WATERS FROM LITTLE EGG INLET TO GREAT EGG INLET NJ OUT 20 NM-
COASTAL WATERS FROM GREAT EGG INLET TO CAPE MAY NJ OUT 20 NM-
COASTAL WATERS FROM CAPE MAY NJ TO CAPE HENLOPEN DE OUT 20 NM-
COASTAL WATERS FROM CAPE HENLOPEN TO FENWICK ISLAND DE OUT 20 NM-
330 AM EDT FRI JUL 23 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS AND
DELAWARE BAY WATERS.

.DAY ONE...TODAY AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

The radar

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

Open the radar archive at this moment

Event by event

19 excessive heat. Local standard time, as filed.

Excessive Heat, Camden

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Camden forecast zone
Reported by: Mesonet
Coordinates: 39.804, -74.960 (the zone’s center; the record gives no point)

Excessive Heat, Cumberland

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Cumberland forecast zone
Reported by: Mesonet
Coordinates: 39.328, -75.129 (the zone’s center; the record gives no point)

Excessive Heat, Eastern Atlantic

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Eastern Atlantic forecast zone
Reported by: Mesonet
Coordinates: 39.469, -74.634 (the zone’s center; the record gives no point)

Excessive Heat, Eastern Cape May

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Eastern Cape May forecast zone
Reported by: Mesonet
Coordinates: 39.085, -74.850 (the zone’s center; the record gives no point)

Excessive Heat, Eastern Monmouth

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Eastern Monmouth forecast zone
Reported by: Mesonet
Coordinates: 40.288, -74.158 (the zone’s center; the record gives no point)

Excessive Heat, Eastern Ocean

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Eastern Ocean forecast zone
Reported by: Mesonet
Coordinates: 39.866, -74.250 (the zone’s center; the record gives no point)

Excessive Heat, Gloucester

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Gloucester forecast zone
Reported by: Mesonet
Coordinates: 39.717, -75.142 (the zone’s center; the record gives no point)

Excessive Heat, Hunterdon

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Hunterdon forecast zone
Reported by: Mesonet
Coordinates: 40.567, -74.912 (the zone’s center; the record gives no point)

Excessive Heat, Mercer

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Mercer forecast zone
Reported by: Mesonet
Coordinates: 40.283, -74.702 (the zone’s center; the record gives no point)

Excessive Heat, Middlesex

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Middlesex forecast zone
Reported by: Mesonet
Coordinates: 40.440, -74.409 (the zone’s center; the record gives no point)

Excessive Heat, Morris

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Morris forecast zone
Reported by: Mesonet
Coordinates: 40.862, -74.544 (the zone’s center; the record gives no point)

Excessive Heat, Northwestern Burlington

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Northwestern Burlington forecast zone
Reported by: Mesonet
Coordinates: 39.878, -74.668 (the zone’s center; the record gives no point)

Excessive Heat, Salem

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Salem forecast zone
Reported by: Mesonet
Coordinates: 39.577, -75.358 (the zone’s center; the record gives no point)

Excessive Heat, Somerset

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Somerset forecast zone
Reported by: Mesonet
Coordinates: 40.564, -74.616 (the zone’s center; the record gives no point)

Excessive Heat, Southeastern Burlington

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Southeastern Burlington forecast zone
Reported by: Mesonet
Coordinates: 39.878, -74.668 (the zone’s center; the record gives no point)

Excessive Heat, Western Atlantic

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Western Atlantic forecast zone
Reported by: Mesonet
Coordinates: 39.469, -74.634 (the zone’s center; the record gives no point)

Excessive Heat, Western Cape May

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Western Cape May forecast zone
Reported by: Mesonet
Coordinates: 39.085, -74.850 (the zone’s center; the record gives no point)

Excessive Heat, Western Monmouth

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Western Monmouth forecast zone
Reported by: Mesonet
Coordinates: 40.288, -74.158 (the zone’s center; the record gives no point)

Excessive Heat, Western Ocean

When: July 23, 9:00 AM EST to July 25, 5:00 PM EST
Where: Western Ocean forecast zone
Reported by: Mesonet
Coordinates: 39.866, -74.250 (the zone’s center; the record gives no point)

What these are

Excessive Heat: Heat at or above the local excessive heat warning criteria, or heat that caused deaths.

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

The same day elsewhere

Every storm in New Jersey in 2010 Every state in 2010 This day in weather history Warnings in New Jersey, July 2010

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 2026-10-01. Each event’s entry at NCEI: 253459, 253460, 253461, 253462, 253463, 253464, 253465, 253466, 253467, 253468, 253469, 253470, 253471, 253472, 253473, 253474, 253475, 253476, 253477.