Alert archive / Pennsylvania / Special Weather Statements in 2017

Special Weather Statement, NWS Philadelphia/Mount Holly

October 24, 2017Warren County, New Jersey; Monroe County, Montgomery County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Oct 24, 2017, 9:27 AM EDT for Warren County, New Jersey; Monroe County, Montgomery County, Northampton County, Pennsylvania. It was in force for 33 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Oct 24, 2017, 9:27 AM EDT (13:27 UTC)
Expired: Oct 24, 2017, 10:00 AM EDT
In force: 33 min
Issued by: NWS Philadelphia/Mount Holly

Counties Warren County, NJ, Monroe County, PA, Montgomery County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 130 km from the middle of the area, began a volume at 13:29 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.

What was reported inside it

Time	Report	Where	Remark
Oct 24, 9:32 AM EDT	NON-TSTM WND DMG	Pleasant Grove, NJ	TREE AND WIRES DOWN ON PLEASANT GROVE ROAD IN LONG VALLEY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 1.5 hours before the alert went out and 192 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.

253 
WWUS81 KPHI 241327
SPSPHI

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

NJZ001-007>009-PAZ054-055-061-062-103>105-241400-
Morris-Hunterdon-Sussex-Warren-Upper Bucks-Lehigh-Eastern
Montgomery-Monroe-Western Montgomery-Northampton-Carbon-
927 AM EDT TUE OCT 24 2017

...A LINE OF SHOWERS WILL AFFECT SOUTHWESTERN MORRIS...NORTHWESTERN
HUNTERDON...WESTERN SUSSEX...WARREN...UPPER BUCKS...SOUTHEASTERN 
LEHIGH...NORTHERN MONTGOMERY...MONROE...NORTHAMPTON AND SOUTHEASTERN 
CARBON COUNTIES...

At 925 AM EDT, radar indicated showers were located along a line
extending from Greentown to near East Bangor to near Riegelsville.
Movement was north at 50 mph.

Winds up to 50 mph and heavy downpours are possible with these 
showers. An isolated lightning strike is also possible.

Locations impacted include...
Allentown, Easton, Mount Pocono, Bethlehem, Lansdale, West Norriton,
Forks, East Norriton, Northampton, East Stroudsburg, Hackettstown,
Quakertown, Tobyhanna, Perkasie, Wilson, Souderton, Bedminster,
Washington, Blairstown and Hellertown.

LAT...LON 4115 7515 4114 7509 4108 7503 4109 7500
      4114 7492 4074 7477 4013 7540 4061 7547
      4123 7551 4125 7513
TIME...MOT...LOC 1325Z 194DEG 43KT 4133 7535 4085 7517 4057 7524 

$$

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, 9:59 AM EDT	Special Weather Statement	PHI	Gloucester	31 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.