Alert archive / Pennsylvania / Special Weather Statements in 2017

Special Weather Statement, NWS Philadelphia/Mount Holly

August 3, 2017Bucks County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 3, 2017, 3:31 PM EDT for Bucks County, Philadelphia County, Pennsylvania. It was in force for 44 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 3, 2017, 3:31 PM EDT (19:31 UTC)
Expired: Aug 3, 2017, 4:15 PM EDT
In force: 44 min
Issued by: NWS Philadelphia/Mount Holly

Counties Bucks County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 52 km from the middle of the area, began a volume at 19:32 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.5 hours before the alert went out and 203 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: 207 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 895 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

613 
WWUS81 KPHI 031931
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
331 PM EDT THU AUG 3 2017

NJZ018-019-PAZ070-071-102>106-032015-
Northwestern Burlington-Camden-Lower Bucks-Upper Bucks-Eastern
Montgomery-Western Montgomery-Delaware-Eastern Chester-Philadelphia-
331 PM EDT THU AUG 3 2017

...RAPIDLY DEVELOPING THUNDERSTORMS WILL AFFECT NORTHWESTERN 
CAMDEN... NORTHWESTERN BURLINGTON...SOUTHEASTERN 
MONTGOMERY...SOUTHERN BUCKS...NORTHEASTERN CHESTER...PHILADELPHIA 
AND NORTHEASTERN DELAWARE COUNTIES...

At 329 PM EDT, a rapidly developing thunderstorm was located over 
Northeast Philadelphia, or 7 miles northeast of Philadelphia, moving 
northeast at 10 mph. Other storms will likely develop in and near 
the Philadelphia metro area in the next hour.

Winds up to 40 mph are possible with this storm.

Locations impacted include...
Philadelphia, Trenton, Camden, Gloucester City, Bensalem, Ewing,
Norristown, Willingboro, Lansdale, West Norriton, East Norriton,
Florence, Bellmawr, Yeadon, Burlington, Bristol, Perkasie,
Doylestown, Riverside and Conshohocken.

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

LAT...LON 3984 7508 3989 7514 3988 7519 3986 7524
      3990 7539 4040 7530 4025 7484 4022 7477
      4015 7472 4019 7470 4017 7468
TIME...MOT...LOC 1929Z 208DEG 10KT 4009 7505 

$$

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 2:47 PM EDT	Special Marine Warning	PHI		58 min
Aug 3, 3:35 PM EDT	Special Marine Warning	PHI		85 min
Aug 3, 4:44 PM EDT	Special Weather Statement	PHI	Mercer	31 min
Aug 3, 4:47 PM EDT	Special Marine Warning	PHI		88 min
Aug 3, 4:51 PM EDT	Special Weather Statement	PHI	Salem	24 min
Aug 3, 5:07 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Monmouth, Ocean	38 min
Aug 3, 5:17 PM EDT	Flash Flood Warning	PHI	Burlington, Mercer	4 hr
Aug 3, 5:42 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer	48 min
Aug 3, 5:54 PM EDT	Special Weather Statement	PHI	Somerset	36 min
Aug 3, 6:06 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	39 min
Aug 3, 6:38 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden	4 hr
Aug 3, 6:50 PM EDT	Special Weather Statement	PHI	Mercer	55 min
Aug 3, 6:54 PM EDT	Special Weather Statement	PHI	Hunterdon	66 min
Aug 3, 7:25 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer	4 hr
Aug 3, 7:34 PM EDT	Special Weather Statement	PHI	Hunterdon, Mercer	41 min
Aug 3, 7:47 PM EDT	Special Weather Statement	PHI	Morris	43 min
Aug 3, 5:57 PM EDT	Special Weather Statement	PHI	Delaware	33 min
Aug 3, 6:15 PM EDT	Special Weather Statement	PHI	Philadelphia	30 min
Aug 3, 6:34 PM EDT	Special Weather Statement	PHI	Lehigh	41 min
Aug 3, 7:16 PM EDT	Special Weather Statement	PHI	Lehigh	44 min
Aug 3, 7:37 PM EDT	Special Weather Statement	PHI	Lehigh	38 min
Aug 2, 8:38 PM EDT	Special Weather Statement	PHI	Kent	37 min
Aug 2, 9:12 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's	34 min
Aug 3, 5:33 PM EDT	Areal Flood Advisory	PHI	Caroline	4 hr
Aug 3, 1:54 PM EDT	Special Weather Statement	PHI	Sussex	21 min
Aug 3, 2:12 PM EDT	Special Weather Statement	PHI	Sussex	33 min
Aug 3, 2:15 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	45 min
Aug 3, 2:26 PM EDT	Special Weather Statement	PHI	Sussex	49 min
Aug 3, 2:59 PM EDT	Special Weather Statement	PHI	Kent, Sussex	46 min
Aug 3, 3:46 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	4 hr
Aug 3, 4:17 PM EDT	Flash Flood Warning	PHI	Kent, Sussex	4 hr
Aug 3, 5:01 PM EDT	Special Weather Statement	PHI	Kent	29 min
Aug 3, 5:20 PM EDT	Special Weather Statement	PHI	Sussex	25 min
Aug 3, 5:49 PM EDT	Areal Flood Advisory	PHI	Sussex	4 hr
Aug 3, 6:12 PM EDT	Areal Flood Advisory	PHI	Sussex	3 hr
Aug 3, 6:31 PM EDT	Special Weather Statement	PHI	Sussex	29 min
Aug 3, 7:02 PM EDT	Flash Flood Warning	PHI	Sussex	3 hr

Nearby

Special Weather Statements in Pennsylvania, 2017 Every special weather statement in 2017

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.