Alert archive / New Jersey / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

August 9, 2021Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 9, 2021, 6:37 PM EDT for Mercer County, New Jersey. It was in force for 38 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: Aug 9, 2021, 6:37 PM EDT (22:37 UTC)
Expired: Aug 9, 2021, 7:15 PM EDT
In force: 38 min
Issued by: NWS Philadelphia/Mount Holly
Hail: 0.50 in
Wind: 40

County Mercer County, NJ

The radar

The Philadelphia radar (KDIX), 40 km from the middle of the area, began a volume at 22:41 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 12:00Z, 10.6 hours before the alert went out and 191 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: 12 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 473 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

901 
WWUS81 KPHI 092237
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
637 PM EDT Mon Aug 9 2021
 
NJZ019-PAZ106-092315-
Northwestern Burlington NJ-Lower Bucks PA-
637 PM EDT Mon Aug 9 2021

...A strong thunderstorm will impact portions of northwestern
Burlington and southeastern Bucks Counties through 715 PM EDT...

At 637 PM EDT, Doppler radar was tracking a strong thunderstorm over
Beverly, or 12 miles southwest of Trenton, moving northeast at 10
mph.

HAZARD...Winds in excess of 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...
Willingboro, Florence, Burlington, Bristol, Riverside, Beverly,
Tullytown, Florence-Roebling, Levittown, Columbus, Jacksonville,
Edgewater Park, Delanco, Penndel, Langhorne Manor, Hulmeville,
Cornwells Heights-Eddington, Nws Office, Croydon and Fairless Hills.

This includes the following highways...
 New Jersey Turnpike between exits 5 and 6A.
 Pennsylvania Turnpike between mile markers 354 and 359.
 Interstate 95 in Pennsylvania between mile markers 35 and 40.
 Interstate 295 in New Jersey between mile markers 44 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 3999 7489 4004 7497 4020 7489 4005 7465
TIME...MOT...LOC 2237Z 227DEG 7KT 4007 7489 

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
Aug 9, 3:43 PM EDT	Excessive Heat Watch	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 4 more	12 hr
Aug 9, 4:36 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May, Cumberland, Gloucester, Salem	104 min
Aug 9, 4:45 PM EDT	Special Weather Statement	PHI	Atlantic	30 min
Aug 9, 5:40 PM EDT	Areal Flood Advisory	PHI	Camden, Gloucester	82 min
Aug 9, 6:10 PM EDT	Special Weather Statement	PHI	Burlington	35 min
Aug 9, 5:12 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware	85 min
Aug 9, 5:34 PM EDT	Special Weather Statement	PHI	Philadelphia	26 min
Aug 9, 6:24 PM EDT	Special Weather Statement	PHI	Lehigh	36 min
Aug 9, 6:29 PM EDT	Areal Flood Advisory	PHI	Berks, Montgomery	70 min
Aug 9, 6:49 PM EDT	Special Weather Statement	PHI	Montgomery	26 min
Aug 9, 7:14 PM EDT	Special Weather Statement	PHI	Carbon	31 min
Aug 9, 2:10 PM EDT	Special Weather Statement	PHI	Sussex	50 min
Aug 9, 2:41 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle, Sussex	3 hr
Aug 9, 3:01 PM EDT	Flash Flood Warning	PHI	Kent, Sussex	2 hr
Aug 9, 4:35 PM EDT	Severe Thunderstorm Warning	PHI	Kent	40 min
Aug 9, 4:59 PM EDT	Flash Flood Warning	PHI	Kent	79 min
Aug 9, 5:12 PM EDT	Severe Thunderstorm Warning	PHI	Kent	20 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.