Alert archive / New Jersey / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 352, NWS Philadelphia/Mount Holly

September 9, 2023Morris County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 9, 2023, 3:47 PM EDT for Morris County, New Jersey. It was in force for 43 min. 1 report 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: Sep 9, 2023, 3:47 PM EDT (19:47 UTC)
Expired: Sep 9, 2023, 4:30 PM EDT
In force: 43 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Morris County, NJ

The radar

The Philadelphia radar (KDIX), 103 km from the middle of the area, began a volume at 19:50 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
Sep 9, 4:08 PM EDT	TSTM WND DMG	Parsippany, NJ	911 call center reports trees down all across the county. Time estimated via radar.

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, 7.8 hours before the alert went out and 124 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: 1962 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 541 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

819 
WUUS51 KPHI 091947
SVRPHI
NJC027-092030-
/O.NEW.KPHI.SV.W.0352.230909T1947Z-230909T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
347 PM EDT Sat Sep 9 2023

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Morris County in northern New Jersey...

* Until 430 PM EDT.

* At 347 PM EDT, a severe thunderstorm was located over East Hanover,
  or near Caldwell, moving north at 10 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...
  Madison, Florham Park, East Hanover, Lincoln Park, Kinnelon,
  Chatham, Boonton, Butler, Mountain Lakes, Riverdale, Parsippany,
  Pequannock Township and Hanover Township.

This includes the following highways...
 Interstate 80 in New Jersey between mile markers 43 and 48.
 Interstate 287 in New Jersey between mile markers 40 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4091 7433 4088 7434 4086 7432 4076 7438
      4075 7436 4072 7439 4073 7444 4094 7443
      4101 7435 4100 7430 4097 7428 4092 7429
      4090 7427
TIME...MOT...LOC 1947Z 186DEG 7KT 4081 7434 

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

$$

Staarmann

1 follow-up statement

967 
WWUS51 KPHI 092009
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
409 PM EDT Sat Sep 9 2023

NJC027-092030-
/O.CON.KPHI.SV.W.0352.000000T0000Z-230909T2030Z/
Morris NJ-
409 PM EDT Sat Sep 9 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR SOUTHEASTERN MORRIS COUNTY...

At 409 PM EDT, a severe thunderstorm was located over Parsippany, or
near Morristown, moving north at 10 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...
Madison, Florham Park, East Hanover, Lincoln Park, Kinnelon, Chatham,
Boonton, Butler, Mountain Lakes, Riverdale, Parsippany, Pequannock
Township and Hanover Township.

This includes the following highways...
 Interstate 80 in New Jersey between mile markers 43 and 48.
 Interstate 287 in New Jersey between mile markers 40 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4091 7433 4088 7434 4086 7432 4076 7438
      4075 7436 4072 7439 4073 7444 4094 7443
      4101 7435 4100 7430 4097 7428 4092 7429
      4090 7427
TIME...MOT...LOC 2009Z 170DEG 7KT 4085 7442 

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

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 8, 10:17 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	43 min
Sep 8, 10:58 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	47 min
Sep 9, 12:56 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	64 min
Sep 9, 12:57 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	50 min
Sep 9, 1:17 PM EDT	Special Weather Statement	PHI	Ocean	28 min
Sep 9, 1:46 PM EDT	Special Weather Statement	PHI	Ocean	29 min
Sep 9, 2:07 PM EDT	Special Weather Statement	PHI	Atlantic	38 min
Sep 9, 2:16 PM EDT	Special Weather Statement	PHI	Burlington	29 min
Sep 9, 2:26 PM EDT	Special Weather Statement	PHI	Middlesex	34 min
Sep 9, 2:42 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth, Somerset	48 min
Sep 9, 3:09 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Middlesex, Somerset	49 min
Sep 9, 3:34 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	56 min
Sep 9, 3:40 PM EDT	Areal Flood Advisory	PHI	Middlesex, Morris, Somerset	2 hr
Sep 9, 3:58 PM EDT	Special Weather Statement	PHI	Somerset	32 min
Sep 9, 4:05 PM EDT	Flash Flood Warning	PHI	Burlington, Camden, Gloucester	4 hr
Sep 9, 4:08 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Somerset, Sussex	53 min
Sep 9, 4:37 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	53 min
Sep 9, 4:40 PM EDT	Special Marine Warning	PHI		65 min
Sep 9, 4:42 PM EDT	Areal Flood Advisory	PHI	Morris	3 hr
Sep 9, 4:49 PM EDT	Special Weather Statement	PHI	Warren	41 min
Sep 9, 4:57 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	49 min
Sep 9, 5:18 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	45 min
Sep 9, 5:34 PM EDT	Special Weather Statement	PHI	Salem	26 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2023 Every severe thunderstorm warning in 2023

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.