Alert archive / Pennsylvania / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

August 9, 2021Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 9, 2021, 5:34 PM EDT for Philadelphia County, Pennsylvania. It was in force for 26 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, 5:34 PM EDT (21:34 UTC)
Expired: Aug 9, 2021, 6:00 PM EDT
In force: 26 min
Issued by: NWS Philadelphia/Mount Holly
Hail: 0.25 in
Wind: 40

County Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 63 km from the middle of the area, began a volume at 21:36 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, 9.6 hours before the alert went out and 219 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.

070 
WWUS81 KPHI 092134
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
534 PM EDT Mon Aug 9 2021
 
NJZ017>019-PAZ071-092200-
Northwestern Burlington NJ-Camden NJ-Gloucester NJ-Philadelphia PA-
534 PM EDT Mon Aug 9 2021

...A strong thunderstorm will impact portions of northwestern Camden,
north central Gloucester and southwestern Philadelphia Counties
through 600 PM EDT...

At 534 PM EDT, Doppler radar was tracking a strong thunderstorm over
Ben Franklin Bridge, or over Camden. This storm was nearly
stationary.

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...
Philadelphia, Camden, Gloucester City, Cherry Hill, Deptford,
Bellmawr, Yeadon, Woodbury, Palmyra, Magnolia, Westville, Woodbury
Heights, National Park, Brooklawn, Audubon Park, Ramblewood,
Barclay-Kingston, Center City, Cherry Hill Mall and South
Philadelphia.

This includes the following highways...
 New Jersey Turnpike between exits 3 and 4.
 Interstate 95 in Pennsylvania between mile markers 15 and 27.
 Interstate 76 in Pennsylvania between mile markers 341 and 351.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey between mile markers 22 and 37.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 676 in New Jersey between mile markers 0 and 4.

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.

&&

LAT...LON 3990 7490 3980 7515 3993 7524 3994 7524
      3995 7525 3996 7525 3997 7527 4004 7510
TIME...MOT...LOC 2134Z 333DEG 4KT 3996 7513 

MAX HAIL SIZE...0.25 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, 6:37 PM EDT	Special Weather Statement	PHI	Mercer	38 min
Aug 9, 5:12 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware	85 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 Pennsylvania, 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.