Alert archive / New Jersey / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

September 9, 2021Hunterdon County, Somerset County, Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this special weather statement at Sep 9, 2021, 12:07 AM EDT for Hunterdon County, Somerset County, Warren County, New Jersey. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 9, 2021, 12:07 AM EDT (04:07 UTC)
Expired: Sep 9, 2021, 12:30 AM EDT
In force: 23 min
Issued by: NWS Philadelphia/Mount Holly
Hail: 0.50 in
Wind: 40

Counties Hunterdon County, NJ, Somerset County, NJ, Warren County, NJ

The radar

The Philadelphia radar (KDIX), 104 km from the middle of the area, began a volume at 04:08 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 4.1 hours before the alert went out and 163 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: 619 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 807 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 211 m²/s²
0-3 km storm-relative helicity: 225 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.4

Open this sounding in Storm Lab

The text

As transmitted.

999 
WWUS81 KPHI 090407
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
1207 AM EDT Thu Sep 9 2021
 
NJZ001-007>010-PAZ062-105-090430-
Hunterdon NJ-Morris NJ-Sussex NJ-Somerset NJ-Warren NJ-
Upper Bucks PA-Northampton PA-
1207 AM EDT Thu Sep 9 2021

...Strong thunderstorms will impact portions of Hunterdon, western
Morris, south central Sussex, Warren, northwestern Somerset, north
central Bucks and northeastern Northampton Counties through 1230 AM
EDT...

At 1207 AM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Oxford to Milford. Movement was northeast
at 35 mph.

HAZARD...Wind gusts up to 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects. Minor damage to outdoor objects is 
         possible.

Locations impacted include...
Somerville, Bridgewater, Dover, Hopatcong, Manville, Hackettstown,
Wharton, Washington, Mount Arlington, Franklin, Mendham, High Bridge,
Stanhope, Netcong, Clinton, Belvidere, Harmony, Peapack And
Gladstone, Oxford and Ogdensburg.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 0 and 34.
 Interstate 80 in New Jersey between mile markers 7 and 35.
 Interstate 287 in New Jersey between mile markers 16 and 26.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 4112 7453 4055 7459 4049 7518 4088 7519
TIME...MOT...LOC 0407Z 243DEG 31KT 4080 7504 4056 7507 

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 8, 9:16 PM EDT	Areal Flood Advisory	PHI	Warren	3 hr
Sep 8, 9:16 PM EDT	Special Weather Statement	PHI	Sussex, Warren	29 min
Sep 8, 9:43 PM EDT	Special Weather Statement	PHI	Sussex, Warren	47 min
Sep 8, 10:42 PM EDT	Flash Flood Warning	PHI	Warren	6 hr
Sep 8, 10:56 PM EDT	Special Weather Statement	PHI	Warren	34 min
Sep 8, 11:27 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	48 min
Sep 8, 11:30 PM EDT	Areal Flood Advisory	PHI	Morris, Sussex	4 hr
Sep 9, 12:18 AM EDT	Special Marine Warning	PHI		57 min
Sep 9, 12:30 AM EDT	Special Weather Statement	PHI	Morris	30 min
Sep 9, 12:41 AM EDT	Special Marine Warning	PHI		52 min
Sep 9, 2:17 AM EDT	Special Weather Statement	PHI	Ocean	28 min
Sep 9, 2:46 AM EDT	Special Weather Statement	PHI	Atlantic	29 min
Sep 9, 3:14 AM EDT	Special Weather Statement	PHI	Atlantic	31 min
Sep 9, 3:30 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Cumberland	112 min
Sep 9, 4:28 AM EDT	Areal Flood Warning	PHI	Warren	4 hr
Sep 8, 8:47 PM EDT	Special Weather Statement	PHI	Northampton	28 min
Sep 8, 9:12 PM EDT	Special Weather Statement	PHI	Lehigh	48 min
Sep 8, 9:38 PM EDT	Special Weather Statement	PHI	Berks	52 min
Sep 8, 9:46 PM EDT	Special Weather Statement	PHI	Lehigh, Northampton	44 min
Sep 8, 9:48 PM EDT	Flash Flood Warning	PHI	Lehigh, Northampton	7 hr
Sep 8, 9:59 PM EDT	Areal Flood Advisory	PHI	Berks	3 hr
Sep 8, 10:11 PM EDT	Severe Thunderstorm Warning	PHI	Berks	49 min
Sep 8, 10:23 PM EDT	Tornado Warning	PHI	Berks	22 min
Sep 8, 10:27 PM EDT	Special Weather Statement	PHI	Northampton	33 min
Sep 8, 10:47 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	3 hr
Sep 8, 10:47 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh, Montgomery, Northampton	58 min
Sep 8, 11:35 PM EDT	Special Weather Statement	PHI	Chester, Delaware, Montgomery	40 min
Sep 9, 12:08 AM EDT	Special Weather Statement	PHI	Bucks, Delaware, Montgomery, Philadelphia	37 min
Sep 9, 4:26 AM EDT	Areal Flood Warning	PHI	Lehigh, Northampton	3 hr
Sep 9, 12:58 AM EDT	Special Weather Statement	PHI	New Castle	32 min
Sep 9, 1:12 AM EDT	Areal Flood Advisory	PHI	New Castle	62 min
Sep 9, 5:37 AM EDT	Areal Flood Advisory	PHI	Kent, New Castle, Sussex	3 hr

Nearby

Special Weather Statements in New Jersey, 2021 Every special weather statement in 2021

Sources

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