Alert archive / Pennsylvania / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

August 26, 2021Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 26, 2021, 6:56 PM EDT for Philadelphia County, Pennsylvania. It was in force for 34 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 26, 2021, 6:56 PM EDT (22:56 UTC)
Expired: Aug 26, 2021, 7:30 PM EDT
In force: 34 min
Issued by: NWS Philadelphia/Mount Holly
Hail: 0.00 in
Wind: 40

County Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 45 km from the middle of the area, began a volume at 22:59 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, 10.9 hours before the alert went out and 198 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: 844 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1230 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

122 
WWUS81 KPHI 262256
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
656 PM EDT Thu Aug 26 2021
 
NJZ019-PAZ071-106-262330-
Northwestern Burlington NJ-Lower Bucks PA-Philadelphia PA-
656 PM EDT Thu Aug 26 2021

...A strong thunderstorm will impact portions of northwestern
Burlington and east central Philadelphia Counties through 730 PM
EDT...

At 655 PM EDT, Doppler radar was tracking a strong thunderstorm over
Riverside, or 9 miles east of Philadelphia, moving east at 10 mph.

HAZARD...Wind gusts up to 40 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Philadelphia, Willingboro, Lumberton, Burlington, Bristol, Riverside,
Palmyra, Beverly, Andalusia, Cinnaminson, Edgewater Park, Delanco,
Riverton, Cornwells Heights-Eddington, Nws Office, Croydon and
Moorestown-Lenola.

This includes the following highways...
 New Jersey Turnpike between exits 5 and 6.
 Interstate 95 in Pennsylvania between mile markers 31 and 37.
 Interstate 295 in New Jersey between mile markers 41 and 51.

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.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4000 7502 4009 7501 4010 7477 3994 7481
TIME...MOT...LOC 2255Z 275DEG 9KT 4004 7495 

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

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 3:30 PM EDT	Flash Flood Watch	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Hunterdon and 8 more	48 hr
Aug 26, 4:28 PM EDT	Areal Flood Advisory	PHI	Ocean	3 hr
Aug 26, 6:14 PM EDT	Special Weather Statement	PHI	Burlington	31 min
Aug 26, 1:20 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	40 min
Aug 26, 5:02 PM EDT	Special Weather Statement	PHI	Monroe	28 min
Aug 26, 5:29 PM EDT	Special Weather Statement	PHI	Monroe	31 min
Aug 26, 5:35 PM EDT	Special Weather Statement	PHI	Carbon	25 min
Aug 26, 5:59 PM EDT	Special Weather Statement	PHI	Carbon	31 min
Aug 26, 6:09 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	51 min
Aug 26, 6:24 PM EDT	Areal Flood Advisory	PHI	Carbon	3 hr
Aug 26, 7:29 PM EDT	Areal Flood Advisory	PHI	Carbon	2 hr
Aug 26, 2:36 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	43 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.