Alert archive / Pennsylvania / Special Weather Statements in 2017

Special Weather Statement, NWS Philadelphia/Mount Holly

June 19, 2017Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Jun 19, 2017, 3:25 PM EDT for Chester County, Pennsylvania. It was in force for 50 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: Jun 19, 2017, 3:25 PM EDT (19:25 UTC)
Expired: Jun 19, 2017, 4:15 PM EDT
In force: 50 min
Issued by: NWS Philadelphia/Mount Holly

County Chester County, PA

The radar

The Dover AFB radar (KDOX), 124 km from the middle of the area, began a volume at 19:25 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.4 hours before the alert went out and 156 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: 448 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1049 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

941 
WWUS81 KPHI 191925
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
325 PM EDT MON JUN 19 2017

MDZ008-PAZ101-102-192015-
Cecil-Western Chester-Eastern Chester-
325 PM EDT MON JUN 19 2017

...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT NORTHWESTERN CECIL...
CHESTER AND WESTERN DELAWARE COUNTIES...

At 325 PM EDT, strong thunderstorms were clustered near Delta, or 12
miles northwest of Aberdeen, moving northeast at 50 mph.

Winds up to 50 mph are possible with this storm.

Locations impacted include...
West Chester, Calvert, Coatesville, Westtown, Downingtown, Kennett
Square, Oxford, Parkesburg, North East, West Grove, Rising Sun, Honey
Brook, Homeville, Glen Roy, Zion, Blake, Cochranville, West
Nottingham, Octoraro and Mount Vernon.

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

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 3972 7623 3973 7610 3974 7609 3976 7606
      3983 7604 3983 7602 3987 7599 3994 7598
      3995 7600 4004 7593 4011 7593 4013 7575
      3994 7552 3954 7607 3970 7622
TIME...MOT...LOC 1925Z 226DEG 44KT 3964 7633 

$$

Meola

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 12:03 PM EDT	Special Weather Statement	PHI	Sussex	27 min
Jun 19, 2:33 PM EDT	Areal Flood Advisory	PHI	Sussex	4 hr
Jun 19, 2:57 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	48 min
Jun 19, 3:17 PM EDT	Flash Flood Warning	PHI	Sussex, Warren	3 hr
Jun 19, 3:35 PM EDT	Severe Thunderstorm Warning	PHI	Warren	25 min
Jun 19, 3:45 PM EDT	Special Weather Statement	PHI	Sussex	15 min
Jun 19, 3:53 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	37 min
Jun 19, 3:54 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Morris, Somerset, Warren	3 hr
Jun 19, 3:56 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Warren	49 min
Jun 19, 4:07 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	38 min
Jun 19, 4:24 PM EDT	Special Marine Warning	PHI		36 min
Jun 19, 4:28 PM EDT	Special Weather Statement	PHI	Sussex	17 min
Jun 19, 4:34 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester, Mercer, Salem	41 min
Jun 19, 4:42 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Cumberland, Gloucester, Salem	3 hr
Jun 19, 4:51 PM EDT	Special Weather Statement	PHI	Gloucester	39 min
Jun 19, 4:58 PM EDT	Special Weather Statement	PHI	Union	32 min
Jun 19, 5:05 PM EDT	Special Marine Warning	PHI		55 min
Jun 19, 5:06 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Monmouth, Somerset	3 hr
Jun 19, 5:09 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 2 more	51 min
Jun 19, 5:15 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Cumberland, Gloucester, Salem	45 min
Jun 19, 5:28 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland	62 min
Jun 19, 5:41 PM EDT	Special Marine Warning	PHI		64 min
Jun 19, 5:44 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 1 more	3 hr
Jun 19, 5:46 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Mercer, Middlesex, Monmouth, Ocean	3 hr
Jun 19, 5:52 PM EDT	Special Weather Statement	PHI	Atlantic, Monmouth, Ocean	38 min
Jun 19, 5:53 PM EDT	Special Marine Warning	PHI		67 min
Jun 19, 6:01 PM EDT	Special Weather Statement	PHI	Cumberland	44 min
Jun 19, 6:13 PM EDT	Special Marine Warning	PHI		92 min
Jun 19, 6:47 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	43 min
Jun 19, 7:08 PM EDT	Special Marine Warning	PHI		52 min
Jun 19, 7:20 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Ocean	25 min
Jun 19, 7:33 PM EDT	Special Marine Warning	PHI		57 min
Jun 19, 12:24 PM EDT	Special Weather Statement	PHI	Monroe	21 min
Jun 19, 12:44 PM EDT	Special Weather Statement	PHI	Carbon	31 min
Jun 19, 12:46 PM EDT	Special Weather Statement	PHI	Berks	29 min
Jun 19, 12:55 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	50 min
Jun 19, 1:25 PM EDT	Special Weather Statement	PHI	Lehigh	35 min
Jun 19, 1:29 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	4 hr
Jun 19, 1:42 PM EDT	Special Weather Statement	PHI	Berks	63 min
Jun 19, 2:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks	52 min
Jun 19, 2:20 PM EDT	Special Weather Statement	PHI	Northampton	40 min
Jun 19, 2:25 PM EDT	Special Weather Statement	PHI	Berks	50 min
Jun 19, 2:38 PM EDT	Special Weather Statement	PHI	Philadelphia	22 min
Jun 19, 2:43 PM EDT	Special Weather Statement	PHI	Berks, Lehigh, Northampton	47 min
Jun 19, 2:49 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh, Montgomery, Northampton	41 min
Jun 19, 2:53 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	52 min
Jun 19, 3:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	52 min
Jun 19, 3:24 PM EDT	Flash Flood Warning	PHI	Carbon, Lehigh, Monroe, Northampton	3 hr
Jun 19, 3:35 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia	3 hr
Jun 19, 4:07 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	38 min
Jun 19, 3:45 PM EDT	Areal Flood Advisory	PHI	Cecil, Kent, Queen Anne's	3 hr
Jun 19, 4:17 PM EDT	Special Weather Statement	PHI	Cecil, Kent, Queen Anne's	58 min
Jun 19, 4:38 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	52 min
Jun 19, 4:59 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Talbot	46 min
Jun 19, 5:14 PM EDT	Areal Flood Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	3 hr
Jun 19, 5:38 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Talbot	67 min
Jun 19, 6:17 PM EDT	Tornado Warning	PHI	Kent, Sussex	16 min
Jun 19, 6:52 PM EDT	Special Weather Statement	PHI	Sussex	23 min
Jun 19, 7:30 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	45 min
Jun 19, 7:34 PM EDT	Areal Flood Advisory	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.