Alert archive / New Jersey / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

August 11, 2021Morris County, Sussex County, Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 11, 2021, 6:32 PM EDT for Morris County, Sussex County, Warren County, New Jersey. It was in force for 28 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: Aug 11, 2021, 6:32 PM EDT (22:32 UTC)
Expired: Aug 11, 2021, 7:00 PM EDT
In force: 28 min
Issued by: NWS Philadelphia/Mount Holly
Hail: 0.25 in
Wind: 40

Counties Morris County, NJ, Sussex County, NJ, Warren County, NJ

The radar

The Philadelphia radar (KDIX), 125 km from the middle of the area, began a volume at 22:32 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
Aug 11, 7:00 PM EDT	TSTM WND DMG	Independence Twp, NJ	SEVERAL DOWNED TREE AND WIRE CALLS IN AND NEAR INDEPENDENCE TWP. TIME ESTIMATED FROM RADAR.
Aug 11, 7:05 PM EDT	TSTM WND DMG	1 Ne Hackettstown, NJ	MULTIPLE TREES SNAPPED AND WIRES BLOWN DOWN NEAR THE INTERSECTION OF BILBY ROAD AND WILLOW GROVE STREET. TIME ESTIMATED FROM 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, 10.5 hours before the alert went out and 153 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: 977 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 711 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

901 
WWUS81 KPHI 112232
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
632 PM EDT Wed Aug 11 2021
 
NJZ001-007>010-PAZ055-062-112300-
Hunterdon NJ-Morris NJ-Sussex NJ-Somerset NJ-Warren NJ-Monroe PA-
Northampton PA-
632 PM EDT Wed Aug 11 2021

...A cluster of strong thunderstorm will impact portions of northern 
Hunterdon, Morris, Sussex, Warren, north central Somerset, 
southeastern Monroe and northeastern Northampton Counties through 
700 PM EDT...

At 632 PM EDT, Doppler radar was tracking a cluster of strong 
thunderstorm near Belvidere, or 16 miles northeast of Easton, moving 
northeast at 25 mph.

HAZARD...Winds in excess of 40 mph and pea size 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...
Morristown, Newton, Montague, Dover, Hopatcong, East Hanover, Lincoln
Park, Kinnelon, East Stroudsburg, Hackettstown, Boonton, Butler,
Wharton, Washington, Rockaway, Blairstown, Morris Plains, Bangor,
Mount Arlington and Franklin.

People at the New Jersey State Fair should seek safe shelter
immediately!

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 6 and 15.
 Interstate 80 in Pennsylvania between mile markers 307 and 314.
 Interstate 80 in New Jersey between mile markers 0 and 49.
 Interstate 287 in New Jersey between mile markers 32 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

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

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
northwestern New Jersey...and eastern and northeastern Pennsylvania.

&&

LAT...LON 4120 7436 4110 7449 4104 7450 4105 7445
      4102 7443 4100 7430 4090 7427 4091 7434
      4086 7432 4080 7436 4060 7504 4091 7535
      4115 7514 4114 7509 4108 7503 4109 7500
      4116 7490 4129 7483 4135 7475 4136 7469
TIME...MOT...LOC 2232Z 237DEG 20KT 4086 7502 

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

$$

Robertson

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 8:02 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	43 min
Aug 10, 8:18 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	42 min
Aug 10, 8:23 PM EDT	Special Marine Warning	PHI		79 min
Aug 10, 8:36 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem	39 min
Aug 10, 8:43 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	2 hr
Aug 10, 9:07 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Cumberland	23 min
Aug 11, 2:56 PM EDT	Excessive Heat Watch	PHI	Hunterdon, Morris, Warren	12 hr
Aug 11, 5:57 PM EDT	Special Weather Statement	PHI	Sussex	48 min
Aug 11, 6:50 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	3 hr
Aug 11, 7:04 PM EDT	Areal Flood Advisory	PHI	Gloucester, Hunterdon, Salem	2 hr
Aug 11, 7:04 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	41 min
Aug 11, 7:11 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	49 min
Aug 11, 7:28 PM EDT	Flash Flood Warning	PHI	Morris, Warren	3 hr
Aug 11, 7:45 PM EDT	Special Weather Statement	PHI	Morris	45 min
Aug 11, 7:52 PM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Camden, Gloucester, Mercer	53 min
Aug 11, 7:57 PM EDT	Special Weather Statement	PHI	Hunterdon, Middlesex, Somerset	48 min
Aug 11, 4:46 PM EDT	Special Weather Statement	PHI	Monroe	44 min
Aug 11, 4:58 PM EDT	Special Weather Statement	PHI	Berks	47 min
Aug 11, 5:20 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	57 min
Aug 11, 5:48 PM EDT	Severe Thunderstorm Warning	PHI	Berks	57 min
Aug 11, 6:16 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh, Montgomery	44 min
Aug 11, 6:26 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware, Montgomery	49 min
Aug 11, 6:48 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Montgomery, Northampton	42 min
Aug 10, 8:11 PM EDT	Special Weather Statement	PHI	New Castle	34 min
Aug 10, 9:09 PM EDT	Special Weather Statement	PHI	Sussex	36 min
Aug 10, 8:13 PM EDT	Special Weather Statement	PHI	Caroline, Talbot	32 min
Aug 10, 8:43 PM EDT	Special Weather Statement	PHI	Caroline	32 min
Aug 11, 6:11 PM EDT	Special Weather Statement	PHI	Caroline, Kent, Queen Anne's	64 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.