Alert archive / Pennsylvania / Special Weather Statements in 2016

Special Weather Statement, NWS Philadelphia/Mount Holly

July 25, 2016Chester County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 25, 2016, 3:21 AM EDT for Chester County, Montgomery County, Pennsylvania. It was in force for 39 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: Jul 25, 2016, 3:21 AM EDT (07:21 UTC)
Expired: Jul 25, 2016, 4:00 AM EDT
In force: 39 min
Issued by: NWS Philadelphia/Mount Holly

Counties Chester County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 127 km from the middle of the area, began a volume at 07:20 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 00:00Z, 7.4 hours before the alert went out and 174 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: 345 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 1901 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 157 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

279 
WWUS81 KPHI 250721
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
321 AM EDT MON JUL 25 2016
 
PAZ060-101>104-250800-
BERKS-WESTERN CHESTER-WESTERN MONTGOMERY-EASTERN MONTGOMERY-EASTERN
CHESTER-
321 AM EDT MON JUL 25 2016

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CHESTER...SOUTHEASTERN
BERKS AND SOUTHWESTERN MONTGOMERY COUNTIES...

AT 321 AM EDT...A LINE OF STRONG THUNDERSTORMS WAS ALONG A LINE
EXTENDING FROM NEAR BIRDSBORO TO NEAR QUARRYVILLE...AND MOVING EAST
AT 20 MPH.

WIND GUSTS UP TO 40 MPH ARE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
WEST CHESTER...NORRISTOWN...POTTSTOWN...PHOENIXVILLE...LANSDALE...
WEST NORRITON...EAST NORRITON...COATESVILLE...DOWNINGTOWN...
KENNETT SQUARE...BIRDSBORO...COLLEGEVILLE...OXFORD...ROYERSFORD...
PARKESBURG...TRAPPE...WEST GROVE...HONEY BROOK...
SCHWENKSVILLE AND ELVERSON.

LAT...LON 3987 7599 3992 7600 3994 7598 3995 7600
      4004 7593 4011 7594 4014 7588 4020 7596
      4036 7583 4022 7522 3975 7582 3981 7603
      3983 7604
TIME...MOT...LOC 0721Z 276DEG 19KT 4030 7579 3992 7609 
$$
MANNING

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 4:46 AM EDT	Special Weather Statement	PHI	Burlington, Camden, Mercer	59 min
Jul 25, 4:54 AM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	51 min
Jul 25, 5:27 AM EDT	Special Weather Statement	PHI	Burlington, Ocean	63 min
Jul 25, 6:17 AM EDT	Special Marine Warning	PHI		88 min
Jul 25, 7:11 AM EDT	Special Marine Warning	PHI		64 min
Jul 25, 7:59 AM EDT	Special Weather Statement	PHI	Ocean	61 min
Jul 25, 8:04 AM EDT	Special Marine Warning	PHI		56 min
Jul 25, 9:00 AM EDT	Special Marine Warning	PHI		60 min
Jul 25, 3:52 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Warren	53 min
Jul 25, 4:34 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	56 min
Jul 25, 4:37 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset	38 min
Jul 25, 5:04 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	41 min
Jul 25, 5:15 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset	45 min
Jul 25, 5:39 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	46 min
Jul 25, 5:57 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	48 min
Jul 25, 5:58 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth	47 min
Jul 25, 6:01 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	44 min
Jul 25, 6:04 PM EDT	Special Marine Warning	PHI		56 min
Jul 25, 6:17 PM EDT	Flash Flood Warning	PHI	Mercer, Middlesex, Monmouth, Somerset	4 hr
Jul 25, 6:39 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	40 min
Jul 25, 6:43 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Ocean	62 min
Jul 25, 6:54 PM EDT	Special Marine Warning	PHI		66 min
Jul 25, 6:55 PM EDT	Areal Flood Advisory	PHI	Burlington	2 hr
Jul 25, 7:12 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Ocean	63 min
Jul 25, 7:17 PM EDT	Flash Flood Warning	PHI	Burlington, Camden	4 hr
Jul 25, 7:53 PM EDT	Special Weather Statement	PHI	Atlantic	37 min
Jul 25, 7:58 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	44 min
Jul 25, 3:55 AM EDT	Special Weather Statement	PHI	Bucks, Delaware, Montgomery, Philadelphia	50 min
Jul 25, 4:19 AM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	41 min
Jul 25, 3:15 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	45 min
Jul 25, 4:00 PM EDT	Special Weather Statement	PHI	Lehigh	30 min
Jul 25, 5:19 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Northampton	56 min
Jul 25, 1:16 AM EDT	Special Weather Statement	PHI	Talbot	44 min
Jul 25, 1:20 AM EDT	Severe Thunderstorm Warning	PHI	Talbot	40 min
Jul 25, 1:59 AM EDT	Severe Thunderstorm Warning	PHI	Talbot	46 min

Nearby

Special Weather Statements in Pennsylvania, 2016 Every special weather statement in 2016

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.