Alert archive / Pennsylvania / Special Weather Statements in 2017

Special Weather Statement, NWS Philadelphia/Mount Holly

August 3, 2017Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 3, 2017, 5:57 PM EDT for Delaware County, Pennsylvania. It was in force for 33 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, 5:57 PM EDT (21:57 UTC)
Expired: Aug 3, 2017, 6:30 PM EDT
In force: 33 min
Issued by: NWS Philadelphia/Mount Holly

County Delaware County, PA

The radar

The Philadelphia radar (KDIX), 100 km from the middle of the area, began a volume at 22:01 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, 10.0 hours before the alert went out and 185 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: 236 J/kg
Mixed-layer CIN: -161 J/kg
Mixed-layer LCL: 1183 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 60 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

208 
WWUS81 KPHI 032157
SPSPHI

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

DEZ001-PAZ070-102-032230-
New Castle-Delaware-Eastern Chester-
557 PM EDT THU AUG 3 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL NEW CASTLE...
SOUTHEASTERN CHESTER AND SOUTHWESTERN DELAWARE COUNTIES...

At 557 PM EDT, a strong thunderstorm was located over Elam, or near
West Chester, moving northeast at 15 mph.

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

Locations impacted include...
Wilmington, West Chester, Westtown, Elsmere, Kennett Square, Newport,
Arden, Cheyney, Talleyville, Elam, Lima, Chelsea, Ashland,
Gradyville, Greenville, Concordville, Hockessin, Nether Providence
Township, Chester Township and North Star.

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

Frequent cloud to ground lightning is also occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

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 3971 7558 3979 7578 4005 7554 3989 7536
TIME...MOT...LOC 2157Z 214DEG 15KT 3988 7557 

$$

JRK

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, 3:31 PM EDT	Special Weather Statement	PHI	Bucks, Philadelphia	44 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.