New Jersey, 2001

Hail and Damaging Winds in New Jersey, April 9, 2001

April 9, 2001 · NWS OKX · 6 events in 4 counties and zones

On Monday morning of April 9th, a nearly stationary front extended from the southern Great Lakes to the northern Middle Atlantic coast. A wave of low pressure developed along this frontal boundary, and traveled east into southeast New York by late Monday afternoon.

Where it happened

Every event with a place to put it. 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
6

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 OKX wrote it up.

On Monday morning of April 9th, a nearly stationary front extended from the southern Great Lakes to the northern Middle Atlantic coast. A wave of low pressure developed along this frontal boundary, and traveled east into southeast New York by late Monday afternoon. In response to this wave, the stationary front lifted north during Monday afternoon into southern New York State. This allowed warm, moist and unstable air to usher into portions of northern New Jersey.As a cold front approached from the west, scattered thunderstorms developed during the late afternoon. Some thunderstorms became severe and produced dime- to nickel-sized hail early Monday evening across portions of northern New Jersey. In addition, high winds downed several large tree limbs onto electrical wires, which resulted in power outages in West Milford and Irvington. Brief heavy downpours also accompanied these thunderstorms. The thunderstorms moved east, out of northern New Jersey by late evening.

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 New York, NY wrote its last area forecast discussion before the first event at Apr 9, 2:15 PM EST, 4 hours 18 minutes earlier.

Area forecast discussion, Apr 9, 2:15 PM EST, 4 hours 18 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW YORK NY
315 PM EDT MON APR 9 2001

AREA OF RW/TRW SHOULD MOVE INTO NWRN PTNS OF THE FA IN ABOUT 2 TO 3
HOURS. THE TRW WILL MOVE INTO AN AREA OF MORE STABLE AIR OVER THE FA
WHICH WILL LIMIT THEIR STRENGTH. DEW PTS OVER THE FA ARE IN THE 40S.
ALL PRECIP SHOULD END FROM W TO E ARND MIDNIGHT. SOME FOG PSBL
TNGT...BUT THEN HI PRESS POKES IN FROM THE N TWDS MORN.

HI PRESS RIDGE OVER THE AREA WILL RESULT IN FAIR WX ON TUES. INCRSG
CLDS TUE NGT AS WARM FRONT APCHS FROM THE SW. PRECIP ASSOC WITH THE
FRONT SHOULD MOVE INTO THE FA WED MORN.

MARINE...SCA RMNS UP FOR ROUGH SEAS...BUT SEAS SHOULD DIMINISH TNGT.

.OKX...
CT...NONE.
NJ...NONE.
NY...NONE.
.MARINE...SCA...CSTL WATERS FOR SEAS (ANZ355-353-350).

EKH

The radar

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

Open the radar archive at this moment

Event by event

4 hail, 2 thunderstorm wind. Local standard time, as filed.

Hail, Essex

When
April 9, 6:33 PM EST
Where
Essex County, West Caldwell
Measured
0.75 in hail
Reported by
TRAINED SPOTTER
Coordinates
40.817, -74.283

Hail, Passaic

When
April 9, 6:59 PM EST
Where
Passaic County, Clifton
Measured
0.88 in hail
Reported by
TRAINED SPOTTER
Coordinates
40.867, -74.150

Thunderstorm Wind, Passaic

When
April 9, 7:00 PM EST
Where
Passaic County, West Milford
Measured
50 kt (58 mph)
Reported by
TRAINED SPOTTER
Coordinates
41.133, -74.383

Hail, Bergen

When
April 9, 7:01 PM EST to 7:02 PM EST
Where
Bergen County, Lyndhurst
Measured
0.88 in hail
Reported by
TRAINED SPOTTER
Coordinates
40.817, -74.117

Thunderstorm Wind, Essex

When
April 9, 7:10 PM EST
Where
Essex County, Irvington
Measured
50 kt (58 mph)
Reported by
TRAINED SPOTTER
Coordinates
40.717, -74.217

Hail, Hudson

When
April 9, 7:11 PM EST
Where
Hudson County, Jersey City
Measured
0.88 in hail
Reported by
TRAINED SPOTTER
Coordinates
40.717, -74.083

What these are

Hail
Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
Thunderstorm Wind
Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.

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

The same day elsewhere

More

Every storm in New Jersey in 2001Every state in 2001This day in weather historyWarnings in New Jersey, April 2001

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: 5239864, 5239859, 5239863, 5239860, 5239861, 5239862.