Alert archive / New Jersey / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 18, NWS Philadelphia/Mount Holly

April 15, 2025Morris County, Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 15, 2025, 4:58 PM EDT for Morris County, Sussex County, New Jersey. It was in force for 39 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 15, 2025, 4:58 PM EDT (20:58 UTC)
Expired: Apr 15, 2025, 5:37 PM EDT
In force: 39 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Morris County, NJ, Sussex County, NJ

The radar

The Philadelphia radar (KDIX), 119 km from the middle of the area, began a volume at 21:01 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Apr 15, 5:17 PM EDT	HAIL 0.25	Jefferson Twp, NJ
Apr 15, 5:18 PM EDT	HAIL 0.5	Oak Ridge, NJ

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.0 hours before the alert went out and 133 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1029 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

007 
WUUS51 KPHI 152058
SVRPHI
NJC027-037-152200-
/O.NEW.KPHI.SV.W.0018.250415T2058Z-250415T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
458 PM EDT Tue Apr 15 2025

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northeastern Morris County in northern New Jersey...
  Central Sussex County in northwestern New Jersey...

* Until 600 PM EDT.

* At 456 PM EDT, a severe thunderstorm was located over Newton, 
  moving east at 40 mph. THis storm has a history of producing wind 
  damage in Monroe County in eastern Pennsylvania.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Franklin, Mountain Lakes, Lake Mohawk, Rockaway, White Meadow Lake,
  Hamburg, Boonton, Green Pond, Pellettown, Crandon Lakes, Andover,
  Hanover Township, Riverdale, Victory Gardens, Lincoln Park,
  Branchville, Kinnelon, Butler, Morris Plains, and Mount Arlington.

This includes the following highways...
 Interstate 80 in New Jersey between mile markers 31 and 49.
 Interstate 287 in New Jersey between mile markers 38 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.

&&

LAT...LON 4119 7438 4110 7449 4104 7450 4105 7445
      4102 7443 4103 7442 4100 7430 4097 7428
      4092 7429 4090 7427 4091 7434 4086 7432
      4077 7437 4104 7492 4122 7478
TIME...MOT...LOC 2056Z 287DEG 36KT 4109 7476 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Staarmann

3 follow-up statements

404 
WWUS51 KPHI 152115
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
515 PM EDT Tue Apr 15 2025

NJC027-037-152200-
/O.CON.KPHI.SV.W.0018.000000T0000Z-250415T2200Z/
Morris NJ-Sussex NJ-
515 PM EDT Tue Apr 15 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR NORTHEASTERN MORRIS AND CENTRAL SUSSEX COUNTIES...

At 514 PM EDT, a shower capable of producing damaging winds was 
located near Green Pond, or 9 miles southwest of West Milford, 
moving east at 40 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Franklin, Mountain Lakes, Lake Mohawk, Rockaway, White Meadow Lake,
Hamburg, Boonton, Green Pond, Pellettown, Hanover Township,
Riverdale, Victory Gardens, Lincoln Park, Kinnelon, Butler, Morris
Plains, Mount Arlington, Parsippany, Dover, and Pequannock Township.

This includes the following highways...
 Interstate 80 in New Jersey between mile markers 32 and 49.
 Interstate 287 in New Jersey between mile markers 38 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.

&&

LAT...LON 4119 7438 4110 7449 4104 7450 4105 7445
      4102 7443 4103 7442 4100 7430 4097 7428
      4092 7429 4090 7427 4091 7434 4086 7432
      4077 7437 4095 7471 4121 7467
TIME...MOT...LOC 2114Z 287DEG 35KT 4103 7455 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Staarmann

273 
WWUS51 KPHI 152126
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
526 PM EDT Tue Apr 15 2025

NJC037-152135-
/O.CAN.KPHI.SV.W.0018.000000T0000Z-250415T2200Z/
Sussex NJ-
526 PM EDT Tue Apr 15 2025

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SUSSEX COUNTY IS
CANCELLED...

The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled. However, 
a Wind Advisory remains in effect until 8 PM EDT. Strong westerly 
winds gusting up to 50 mph could result in some additional tree 
damage and isolated power outages through early evening.

LAT...LON 4090 7427 4091 7434 4088 7434 4086 7432
      4077 7437 4094 7461 4108 7450 4104 7450
      4105 7445 4102 7443 4103 7442 4100 7430
      4097 7428 4092 7429
TIME...MOT...LOC 2125Z 288DEG 36KT 4098 7441 

$$

NJC027-152200-
/O.CON.KPHI.SV.W.0018.000000T0000Z-250415T2200Z/
Morris NJ-
526 PM EDT Tue Apr 15 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR NORTHEASTERN MORRIS COUNTY...

At 525 PM EDT, a shower capable of producing damaging winds was 
located over Kinnelon, or near Pompton Lakes, moving east at 40 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Mountain Lakes, Rockaway, White Meadow Lake, Parsippany, Pequannock
Township, Lake Telemark, Boonton, Green Pond, Hanover Township,
Riverdale, Lincoln Park, Kinnelon, Butler, East Hanover, and Morris
Plains.

This includes the following highways...
 Interstate 80 in New Jersey between mile markers 35 and 48.
 Interstate 287 in New Jersey between mile markers 39 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.

&&

LAT...LON 4090 7427 4091 7434 4088 7434 4086 7432
      4077 7437 4094 7461 4108 7450 4104 7450
      4105 7445 4102 7443 4103 7442 4100 7430
      4097 7428 4092 7429
TIME...MOT...LOC 2125Z 288DEG 36KT 4098 7441 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Staarmann

676 
WWUS51 KPHI 152137
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
537 PM EDT Tue Apr 15 2025

NJC027-152146-
/O.CAN.KPHI.SV.W.0018.000000T0000Z-250415T2200Z/
Morris NJ-
537 PM EDT Tue Apr 15 2025

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MORRIS COUNTY IS
CANCELLED...

The storm which prompted the warning has weakened below severe 
limits, and is exiting the warned area. Therefore, the warning has 
been cancelled. However, a Wind Advisory remains in effect until 8 
PM EDT. Strong westerly winds gusting up to 50 mph could result in 
some additional tree damage and isolated power outages through early 
evening.

LAT...LON 4090 7427 4091 7434 4088 7434 4086 7432
      4077 7437 4094 7461 4108 7450 4104 7450
      4105 7445 4102 7443 4103 7442 4100 7430
      4097 7428 4092 7429
TIME...MOT...LOC 2135Z 287DEG 36KT 4094 7426 

$$

Staarmann

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 15, 1:09 PM EDT	Wind Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	7 hr
Apr 15, 1:15 PM EDT	Gale Warning	PHI		11 hr
Apr 15, 4:07 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	53 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2025 Every severe thunderstorm warning in 2025

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.