Alert archive / Pennsylvania / Special Weather Statements in 2016

Special Weather Statement, NWS Philadelphia/Mount Holly

July 18, 2016Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 18, 2016, 1:52 PM EDT for Chester County, Pennsylvania. It was in force for 38 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 18, 2016, 1:52 PM EDT (17:52 UTC)
Expired: Jul 18, 2016, 2:30 PM EDT
In force: 38 min
Issued by: NWS Philadelphia/Mount Holly

County Chester County, PA

The radar

The Philadelphia radar (KDIX), 127 km from the middle of the area, began a volume at 17:54 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, 5.9 hours before the alert went out and 187 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: 200 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 1480 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

507 
WWUS81 KPHI 181752
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
152 PM EDT MON JUL 18 2016
 
PAZ060-101-102-181830-
BERKS-WESTERN CHESTER-EASTERN CHESTER-
152 PM EDT MON JUL 18 2016

...AN AREA OF STRONG THUNDERSTORM WILL AFFECT CENTRAL CHESTER AND
SOUTHEEN BERKS COUNTIES...

AT 152 PM EDT...A STRONG THUNDERSTORM WAS OVER EPHRATA...MOVING EAST
AT 25 MPH.

WIND GUSTS UP TO 50 MPH ARE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
READING...COATESVILLE...WYOMISSING...BIRDSBORO...PARKESBURG...
HONEY BROOK...ELVERSON...NEW MORGAN...GLENMOORE...SHILLINGTON...
MOUNT PENN...MOHNTON...KENHORST...ST. LAWRENCE...SOUTH COATESVILLE...
MODENA...AMITY GARDENS...FLYING HILLS...THORNDALE AND LORANE.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 4036 7570 3993 7575 3996 7599 4004 7593
      4011 7594 4014 7588 4030 7612
TIME...MOT...LOC 1752Z 271DEG 23KT 4019 7615 
$$

PO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 4:04 AM EDT	Small Craft Advisory	PHI		12 hr
Jul 18, 2:42 PM EDT	Special Weather Statement	PHI	Sussex	63 min
Jul 18, 2:51 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	39 min
Jul 18, 3:25 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	50 min
Jul 18, 3:41 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	49 min
Jul 18, 4:04 PM EDT	Special Weather Statement	PHI	Camden, Gloucester, Salem	56 min
Jul 18, 4:07 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	38 min
Jul 18, 4:14 PM EDT	Severe Thunderstorm Warning	PHI	Salem	46 min
Jul 18, 4:15 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Salem	2 hr
Jul 18, 4:37 PM EDT	Severe Thunderstorm Warning	PHI	Salem	38 min
Jul 18, 4:47 PM EDT	Special Marine Warning	PHI		88 min
Jul 18, 4:47 PM EDT	Special Weather Statement	PHI	Burlington, Camden	43 min
Jul 18, 5:00 PM EDT	Special Marine Warning	PHI		60 min
Jul 18, 5:07 PM EDT	Special Marine Warning	PHI		83 min
Jul 18, 5:22 PM EDT	Special Weather Statement	PHI	Cumberland, Salem	53 min
Jul 18, 5:49 PM EDT	Special Marine Warning	PHI		116 min
Jul 18, 5:51 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	24 min
Jul 18, 6:05 PM EDT	Special Marine Warning	PHI		85 min
Jul 18, 6:23 PM EDT	Special Marine Warning	PHI		97 min
Jul 18, 7:43 PM EDT	Special Weather Statement	PHI	Sussex	47 min
Jul 18, 12:58 PM EDT	Special Weather Statement	PHI	Carbon	62 min
Jul 18, 1:48 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	57 min
Jul 18, 2:28 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Northampton	47 min
Jul 18, 3:17 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery, Philadelphia	43 min
Jul 18, 5:18 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's	57 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.