Alert archive / Pennsylvania / Special Weather Statements in 2017

Special Weather Statement, NWS Philadelphia/Mount Holly

October 24, 2017Gloucester County, New Jersey; Bucks County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Oct 24, 2017, 9:59 AM EDT for Gloucester County, New Jersey; Bucks County, Philadelphia County, Pennsylvania. It was in force for 31 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 24, 2017, 9:59 AM EDT (13:59 UTC)
Expired: Oct 24, 2017, 10:30 AM EDT
In force: 31 min
Issued by: NWS Philadelphia/Mount Holly

Counties Gloucester County, NJ, Bucks County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 60 km from the middle of the area, began a volume at 14:00 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, 2.0 hours before the alert went out and 210 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: 229 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 611 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 443 m²/s²
0-3 km storm-relative helicity: 413 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

As transmitted.

802 
WWUS81 KPHI 241359
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
959 AM EDT TUE OCT 24 2017

NJZ009-015-017>019-PAZ070-071-104>106-241430-
Hunterdon-Northwestern Burlington-Camden-Mercer-Gloucester-Lower
Bucks-Upper Bucks-Eastern Montgomery-Delaware-Philadelphia-
959 AM EDT TUE OCT 24 2017

...A SHOWER WILL AFFECT SOUTH CENTRAL HUNTERDON...NORTHWESTERN 
BURLINGTON...NORTHWESTERN CAMDEN...NORTHWESTERN MERCER...NORTH 
CENTRAL GLOUCESTER...BUCKS...EASTERN MONTGOMERY...EAST CENTRAL 
DELAWARE AND PHILADELPHIA COUNTIES...

At 958 AM EDT, a shower was located over Center City, or over
Philadelphia, moving north at 60 mph.

Winds up to 40 mph are possible with this shower.

Locations impacted include...
Philadelphia, Trenton, Camden, Gloucester City, Bensalem, Ewing,
Deptford, West Deptford, Bellmawr, Yeadon, Woodbury, Pitman,
Doylestown, Byram, Riverside, Palmyra, Hatboro, Folcroft, Bedminster
and Ambler.

LAT...LON 3970 7515 3994 7531 4055 7515 4035 7474
TIME...MOT...LOC 1358Z 195DEG 54KT 3999 7518 

$$

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 24, 2:42 AM EDT	Gale Warning	PHI		16 hr
Oct 24, 6:50 AM EDT	Special Weather Statement	PHI	Cumberland	40 min
Oct 24, 7:32 AM EDT	Special Weather Statement	PHI	Burlington, Camden, Gloucester	28 min
Oct 24, 8:00 AM EDT	Special Weather Statement	PHI	Hunterdon, Mercer, Middlesex, Somerset	30 min
Oct 24, 8:33 AM EDT	Wind Advisory	PHI	Sussex	2 hr
Oct 24, 8:58 AM EDT	Special Weather Statement	PHI	Warren	32 min
Oct 24, 9:27 AM EDT	Special Weather Statement	PHI	Warren	33 min
Oct 24, 10:00 AM EDT	Special Weather Statement	PHI	Sussex, Warren	30 min
Oct 24, 10:30 AM EDT	Special Weather Statement	PHI	Burlington, Camden, Hunterdon	30 min
Oct 24, 10:51 AM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	39 min
Oct 24, 11:03 AM EDT	Special Weather Statement	PHI	Atlantic, Burlington	27 min
Oct 24, 11:11 AM EDT	Special Weather Statement	PHI	Mercer, Middlesex, Somerset	34 min
Oct 24, 11:26 AM EDT	Special Weather Statement	PHI	Morris, Somerset	34 min
Oct 24, 11:31 AM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Ocean	29 min
Oct 24, 12:03 PM EDT	Special Weather Statement	PHI	Middlesex, Morris, Sussex	27 min
Oct 24, 12:28 PM EDT	Special Weather Statement	PHI	Morris	32 min
Oct 24, 1:04 PM EDT	Special Weather Statement	PHI	Monmouth	26 min
Oct 24, 2:16 PM EDT	Small Craft Advisory	PHI		13 hr
Oct 24, 5:08 PM EDT	Special Marine Warning	PHI		67 min
Oct 24, 5:37 PM EDT	Special Marine Warning	PHI		53 min
Oct 24, 5:41 PM EDT	Special Weather Statement	PHI	Atlantic	34 min
Oct 24, 5:53 PM EDT	Special Marine Warning	PHI		67 min
Oct 24, 6:01 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Ocean	4 hr
Oct 24, 6:13 PM EDT	Special Weather Statement	PHI	Ocean	32 min
Oct 24, 8:07 AM EDT	Special Weather Statement	PHI	Chester, Montgomery	23 min
Oct 24, 8:28 AM EDT	Special Weather Statement	PHI	Bucks, Delaware, Lehigh, Montgomery, Northampton	32 min
Oct 24, 8:52 AM EDT	Special Weather Statement	PHI	Monroe	23 min
Oct 24, 5:54 AM EDT	Coastal Flood Advisory	PHI	Cecil, Kent, Queen Anne's, Talbot	6 hr

Nearby

Special Weather Statements in Pennsylvania, 2017 Special Weather Statements in New Jersey, 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.