Alert archive / Pennsylvania / Special Weather Statements in 2016

Special Weather Statement, NWS Philadelphia/Mount Holly

August 12, 2016Berks County, Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 12, 2016, 4:03 PM EDT for Berks County, Chester County, Pennsylvania. It was in force for 57 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 12, 2016, 4:03 PM EDT (20:03 UTC)
Expired: Aug 12, 2016, 5:00 PM EDT
In force: 57 min
Issued by: NWS Philadelphia/Mount Holly

Counties Berks County, PA, Chester County, PA

The radar

The Philadelphia radar (KDIX), 118 km from the middle of the area, began a volume at 20:06 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, 8.1 hours before the alert went out and 196 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: 756 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 1172 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

735 
WWUS81 KPHI 122003
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
403 PM EDT FRI AUG 12 2016
 
PAZ060-101-102-122100-
BERKS-WESTERN CHESTER-EASTERN CHESTER-
403 PM EDT FRI AUG 12 2016

...A STRONG THUNDERSTORM WILL AFFECT BERKS AND CHESTER COUNTIES...

AT 402 PM EDT...A STRONG THUNDERSTORM WAS OVER TERRE HILL...OR NEAR
NEW HOLLAND...MOVING EAST AT 25 MPH.

WIND GUSTS UP TO 40 MPH ARE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
READING...WEST CHESTER...PHOENIXVILLE...COATESVILLE...WESTTOWN...
WYOMISSING...DOWNINGTOWN...BIRDSBORO...KUTZTOWN...HAMBURG...
FLEETWOOD...SINKING SPRING...LAURELDALE...PARKESBURG...
WERNERSVILLE...TOPTON...LEESPORT...ADAMSTOWN...
HONEY BROOK AND SHOEMAKERSVILLE.

HEAVY 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 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

LAT...LON 4053 7606 4059 7590 4053 7568 4044 7553
      4024 7570 4022 7561 4024 7560 4015 7553
      4016 7550 4014 7551 4013 7546 3997 7547
      3986 7560 3984 7602 3987 7599 3995 7600
      4004 7593 4011 7594 4014 7588 4028 7610
TIME...MOT...LOC 2002Z 267DEG 21KT 4013 7603 
$$

JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 10:39 PM EDT	Special Weather Statement	PHI	Sussex, Warren	51 min
Aug 11, 10:57 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	4 hr
Aug 11, 11:13 PM EDT	Flash Flood Warning	PHI	Morris, Sussex, Warren	4 hr
Aug 12, 12:06 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset	3 hr
Aug 12, 4:24 AM EDT	Small Craft Advisory	PHI		20 hr
Aug 12, 5:40 PM EDT	Special Weather Statement	PHI	Morris	50 min
Aug 12, 5:44 PM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	31 min
Aug 12, 6:11 PM EDT	Special Weather Statement	PHI	Somerset	34 min
Aug 12, 3:04 AM EDT	Special Weather Statement	PHI	Lehigh, Northampton	56 min
Aug 12, 3:38 PM EDT	Heat Advisory	PHI	Carbon, Monroe	27 hr
Aug 12, 3:53 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	52 min
Aug 12, 4:45 PM EDT	Special Weather Statement	PHI	Lehigh, Northampton	60 min
Aug 12, 4:49 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	41 min
Aug 12, 3:24 PM EDT	Special Weather Statement	PHI	Cecil, Kent	51 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.