Alert archive / Pennsylvania / Special Weather Statements in 2017

Special Weather Statement, NWS Philadelphia/Mount Holly

August 2, 2017Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 2, 2017, 3:34 PM EDT for Chester County, Pennsylvania. It was in force for 26 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 2, 2017, 3:34 PM EDT (19:34 UTC)
Expired: Aug 2, 2017, 4:00 PM EDT
In force: 26 min
Issued by: NWS Philadelphia/Mount Holly

County Chester County, PA

The radar

The Philadelphia radar (KDIX), 118 km from the middle of the area, began a volume at 19:37 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, 7.6 hours before the alert went out and 183 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: 378 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 1469 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

122 
WWUS81 KPHI 021934
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
334 PM EDT WED AUG 2 2017

PAZ101-102-022000-
Western Chester-Eastern Chester-
334 PM EDT WED AUG 2 2017

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL CHESTER COUNTY...

At 333 PM EDT, a strong thunderstorm was located near Coatesville, or
13 miles east of New Holland, moving east at 10 mph.

Winds up to 40 mph and pea size hail are possible with this storm.

Locations impacted include...
West Chester, Coatesville, Downingtown, Honey Brook, Lionville,
Glenmoore, Lionville-Marchwood, Chester Springs, West Goshen, South
Coatesville, Exton and Thorndale.

Torrential rainfall is also occurring with this storm, and may cause
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 3997 7592 4012 7592 4014 7562 3997 7559
TIME...MOT...LOC 1933Z 264DEG 11KT 4005 7585 

$$

po

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 12:28 PM EDT	Areal Flood Advisory	PHI	Mercer	4 hr
Aug 2, 12:31 PM EDT	Special Weather Statement	PHI	Morris	29 min
Aug 2, 12:37 PM EDT	Special Weather Statement	PHI	Mercer	38 min
Aug 2, 12:43 PM EDT	Areal Flood Advisory	PHI	Middlesex	4 hr
Aug 2, 1:00 PM EDT	Special Weather Statement	PHI	Morris	30 min
Aug 2, 1:02 PM EDT	Areal Flood Advisory	PHI	Morris	5 hr
Aug 2, 1:32 PM EDT	Special Weather Statement	PHI	Morris	28 min
Aug 2, 2:01 PM EDT	Areal Flood Advisory	PHI	Hunterdon	4 hr
Aug 2, 2:04 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	41 min
Aug 2, 2:09 PM EDT	Special Weather Statement	PHI	Camden	51 min
Aug 2, 2:10 PM EDT	Flash Flood Warning	PHI	Morris	4 hr
Aug 2, 2:18 PM EDT	Special Weather Statement	PHI	Warren	42 min
Aug 2, 2:26 PM EDT	Special Weather Statement	PHI	Burlington	49 min
Aug 2, 2:35 PM EDT	Special Weather Statement	PHI	Burlington	40 min
Aug 2, 2:42 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset	4 hr
Aug 2, 2:45 PM EDT	Areal Flood Advisory	PHI	Warren	4 hr
Aug 2, 2:46 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	44 min
Aug 2, 2:48 PM EDT	Severe Thunderstorm Warning	PHI	Warren	27 min
Aug 2, 2:55 PM EDT	Areal Flood Advisory	PHI	Burlington, Monmouth, Ocean	5 hr
Aug 2, 3:04 PM EDT	Severe Thunderstorm Warning	PHI	Warren	41 min
Aug 2, 3:06 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	4 hr
Aug 2, 3:16 PM EDT	Special Weather Statement	PHI	Burlington	29 min
Aug 2, 3:20 PM EDT	Areal Flood Advisory	PHI	Burlington, Ocean	4 hr
Aug 2, 3:32 PM EDT	Special Weather Statement	PHI	Warren	43 min
Aug 2, 3:33 PM EDT	Special Weather Statement	PHI	Monmouth	42 min
Aug 2, 3:36 PM EDT	Special Weather Statement	PHI	Union	39 min
Aug 2, 3:39 PM EDT	Special Weather Statement	PHI	Middlesex	51 min
Aug 2, 3:50 PM EDT	Special Weather Statement	PHI	Sussex	25 min
Aug 2, 3:58 PM EDT	Areal Flood Advisory	PHI	Burlington, Mercer, Middlesex, Monmouth, Morris, Somerset	4 hr
Aug 2, 4:06 PM EDT	Special Weather Statement	PHI	Gloucester, Salem	39 min
Aug 2, 4:09 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	4 hr
Aug 2, 4:15 PM EDT	Special Marine Warning	PHI		60 min
Aug 2, 4:27 PM EDT	Areal Flood Advisory	PHI	Camden, Gloucester, Salem	4 hr
Aug 2, 4:29 PM EDT	Special Weather Statement	PHI	Cumberland	46 min
Aug 2, 4:39 PM EDT	Special Weather Statement	PHI	Somerset	36 min
Aug 2, 4:48 PM EDT	Special Weather Statement	PHI	Camden	42 min
Aug 2, 5:11 PM EDT	Special Weather Statement	PHI	Cumberland	34 min
Aug 2, 5:15 PM EDT	Special Marine Warning	PHI		60 min
Aug 2, 5:21 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Cumberland, Gloucester	39 min
Aug 2, 5:23 PM EDT	Special Weather Statement	PHI	Gloucester	37 min
Aug 2, 5:28 PM EDT	Areal Flood Advisory	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	4 hr
Aug 2, 5:46 PM EDT	Areal Flood Advisory	PHI	Morris	59 min
Aug 2, 6:02 PM EDT	Special Marine Warning	PHI		58 min
Aug 2, 6:11 PM EDT	Special Marine Warning	PHI		64 min
Aug 2, 6:52 PM EDT	Special Marine Warning	PHI		53 min
Aug 2, 6:52 PM EDT	Special Weather Statement	PHI	Cape May	38 min
Aug 2, 12:09 PM EDT	Special Weather Statement	PHI	Philadelphia	36 min
Aug 2, 12:11 PM EDT	Special Weather Statement	PHI	Monroe	34 min
Aug 2, 12:39 PM EDT	Areal Flood Advisory	PHI	Monroe	4 hr
Aug 2, 12:45 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	4 hr
Aug 2, 12:52 PM EDT	Special Weather Statement	PHI	Monroe	23 min
Aug 2, 12:53 PM EDT	Special Weather Statement	PHI	Carbon	37 min
Aug 2, 12:55 PM EDT	Special Weather Statement	PHI	Delaware	35 min
Aug 2, 1:08 PM EDT	Special Weather Statement	PHI	Philadelphia	37 min
Aug 2, 1:26 PM EDT	Special Weather Statement	PHI	Delaware	34 min
Aug 2, 1:30 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	30 min
Aug 2, 1:36 PM EDT	Special Weather Statement	PHI	Bucks	39 min
Aug 2, 1:48 PM EDT	Flash Flood Warning	PHI	Montgomery	4 hr
Aug 2, 1:49 PM EDT	Special Weather Statement	PHI	Lehigh	41 min
Aug 2, 1:50 PM EDT	Special Weather Statement	PHI	Philadelphia	25 min
Aug 2, 2:09 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Montgomery	51 min
Aug 2, 2:16 PM EDT	Areal Flood Advisory	PHI	Berks	4 hr
Aug 2, 2:27 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Montgomery	4 hr
Aug 2, 2:37 PM EDT	Special Weather Statement	PHI	Berks	38 min
Aug 2, 3:12 PM EDT	Special Weather Statement	PHI	Montgomery	48 min
Aug 2, 4:23 PM EDT	Special Weather Statement	PHI	Monroe	37 min
Aug 2, 4:40 PM EDT	Special Weather Statement	PHI	Philadelphia	50 min
Aug 2, 6:00 PM EDT	Special Weather Statement	PHI	Kent	30 min
Aug 2, 6:21 PM EDT	Special Weather Statement	PHI	Queen Anne's	39 min
Aug 2, 6:28 PM EDT	Areal Flood Advisory	PHI	Kent, Queen Anne's	4 hr
Aug 2, 6:55 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Queen Anne's	35 min
Aug 2, 7:30 PM EDT	Special Weather Statement	PHI	Caroline, Queen Anne's	45 min
Aug 2, 7:58 PM EDT	Severe Thunderstorm Warning	PHI	Caroline	47 min
Aug 2, 1:44 PM EDT	Flash Flood Warning	PHI	New Castle	4 hr
Aug 2, 3:16 PM EDT	Areal Flood Advisory	PHI	Kent	7 hr
Aug 2, 6:27 PM EDT	Special Weather Statement	PHI	Kent	33 min

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.