Alert archive / New Jersey / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

October 16, 20217 counties in New Jersey; Delaware County, Montgomery County, Philadelphia County, Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Oct 16, 2021, 4:18 PM EDT for 7 counties in New Jersey; Delaware County, Montgomery County, Philadelphia County, Pennsylvania; New Castle County, Delaware. It was in force for 57 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
Oct 16, 2021, 4:18 PM EDT (20:18 UTC)
Expired
Oct 16, 2021, 5:15 PM EDT
In force
57 min
Issued by
NWS Philadelphia/Mount Holly
Hail
0.00 in
Wind
40

Counties New Castle County, DE, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Mercer County, NJ, Salem County, NJ, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 53 km from the middle of the area, began a volume at 20:20 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.3 hours before the alert went out and 196 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-pSkew-T log-p diagram, Wallops Is Stn, VA at 12:00Z on 2021-10-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2021-10-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
914 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
191 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

411 
WWUS81 KPHI 162018
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
418 PM EDT Sat Oct 16 2021
 
DEZ001-002-MDZ015-NJZ012-013-015>025-027-PAZ070-071-102>104-106-
162115-
Kent DE-New Castle DE-Queen Anne's MD-Coastal Atlantic NJ-Salem NJ-
Camden NJ-Atlantic NJ-Mercer NJ-Southeastern Burlington NJ-
Northwestern Burlington NJ-Cumberland NJ-Ocean NJ-
Western Monmouth NJ-Middlesex NJ-Atlantic Coastal Cape May NJ-
Cape May NJ-Gloucester NJ-Lower Bucks PA-Eastern Montgomery PA-
Philadelphia PA-Western Montgomery PA-Delaware PA-Eastern Chester PA-
418 PM EDT Sat Oct 16 2021

...A gust front and an associated line of showers behind it will 
impact portions of central New Castle, northern Kent, eastern Queen 
Anne's, northwestern Ocean, Camden, Mercer, Atlantic, Cumberland, 
Salem, Gloucester, northern Cape May, Burlington, central Monmouth, 
southern Middlesex, southeastern Montgomery, southeastern Bucks, 
east central Chester, Philadelphia and Delaware Counties through 515 
PM EDT...

At 414 PM EDT, Doppler radar was tracking a gust front and an 
associated line of showers behind it along a line extending from 
Pennington to near Dover Base Housing. Movement was east at 40 mph.

HAZARD...Wind gusts up to 45 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects.

Locations impacted include...
Philadelphia, Trenton, Camden, Wilmington, Vineland, Dover,
Millville, Bridgeton, Middletown, Ocean City, Gloucester City,
Cumberland, Cherry Hill, Old Bridge, Bensalem, Jackson, East
Brunswick, Evesham, Mount Laurel and Marlboro.

This includes the following highways...
 New Jersey Turnpike between exits 1 and 9.
 Pennsylvania Turnpike between mile markers 324 and 359.
 Northeast Extension between mile markers 21 and 29.
 Interstate 95 in Pennsylvania between mile markers 0 and 40.
 Interstate 95 in Delaware between mile markers 11 and 23.
 Interstate 76 in Pennsylvania between mile markers 327 and 351.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 195 in New Jersey between mile markers 0 and 25.
 Interstate 295 in New Jersey between mile markers 0 and 76.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 676 in New Jersey between mile markers 0 and 4.
 Interstate 476 in Pennsylvania between mile markers 0 and 19.
 Garden State Parkway between mile markers 21 and 52, and between
mile markers 116 and 119.
 Atlantic City Expressway between mile markers 4 and 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 3922 7456 3914 7581 4023 7541 4044 7416
TIME...MOT...LOC 2014Z 254DEG 36KT 4033 7482 3910 7544 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

$$

Fitzsimmons

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 16, 10:35 AM EDTCoastal Flood StatementPHIOcean2 hr
Oct 16, 3:22 PM EDTSpecial Marine WarningPHI113 min
Oct 16, 3:31 PM EDTSevere Thunderstorm WarningPHISalem18 min
Oct 16, 3:41 PM EDTSpecial Weather StatementPHIHunterdon, Sussex, Warren49 min
Oct 16, 4:02 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Morris, Somerset43 min
Oct 16, 5:10 PM EDTSpecial Marine WarningPHI95 min
Oct 16, 5:29 PM EDTSpecial Marine WarningPHI91 min
Oct 16, 6:09 PM EDTSpecial Marine WarningPHI66 min
Oct 16, 6:52 PM EDTCoastal Flood StatementPHIOcean4 hr
Oct 16, 1:39 PM EDTSpecial Weather StatementPHIBerks51 min
Oct 16, 2:32 PM EDTSpecial Weather StatementPHIBerks, Lehigh58 min
Oct 16, 2:44 PM EDTSpecial Weather StatementPHIChester61 min
Oct 16, 3:40 PM EDTSpecial Weather StatementPHINew Castle50 min

Nearby

Special Weather Statements in New Jersey, 2021Special Weather Statements in Pennsylvania, 2021Special Weather Statements in Delaware, 2021Every 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.