Alert archive / Pennsylvania / Special Weather Statements in 2016

Special Weather Statement, NWS Philadelphia/Mount Holly

August 6, 2016Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 6, 2016, 5:56 PM EDT for Montgomery County, Pennsylvania. It was in force for 34 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 6, 2016, 5:56 PM EDT (21:56 UTC)
Expired: Aug 6, 2016, 6:30 PM EDT
In force: 34 min
Issued by: NWS Philadelphia/Mount Holly

County Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 105 km from the middle of the area, began a volume at 21:58 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, 9.9 hours before the alert went out and 213 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: 157 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 934 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

942 
WWUS81 KPHI 062156
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
556 PM EDT SAT AUG 6 2016
 
PAZ060-070-101>104-062230-
BERKS-WESTERN CHESTER-WESTERN MONTGOMERY-EASTERN MONTGOMERY-EASTERN
CHESTER-DELAWARE-
556 PM EDT SAT AUG 6 2016

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN CHESTER...
SOUTHEASTERN BERKS...NORTH CENTRAL DELAWARE...MONTGOMERY AND
NORTHWESTERN PHILADELPHIA COUNTIES...

AT 555 PM EDT...A STRONG THUNDERSTORM WAS NEAR BIRDSBORO...OR 11
MILES EAST OF READING...MOVING SOUTHEAST AT 20 MPH.

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

LOCATIONS IMPACTED INCLUDE...
NORRISTOWN...POTTSTOWN...PHOENIXVILLE...LANSDALE...WEST NORRITON...
EAST NORRITON...CONSHOHOCKEN...HATBORO...AMBLER...BIRDSBORO...
COLLEGEVILLE...ROYERSFORD...TRAPPE...SCHWENKSVILLE...BALLY...
BECHTELSVILLE...GREEN LANE...VALLEY FORGE...
CEDARVILLE AND RADNOR TOWNSHIP.

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 4046 7573 4017 7511 3992 7545 4026 7587
TIME...MOT...LOC 2155Z 303DEG 18KT 4030 7573 
$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 2:24 PM EDT	Special Weather Statement	PHI	Sussex	36 min
Aug 6, 2:50 PM EDT	Special Weather Statement	PHI	Morris, Sussex, Warren	40 min
Aug 6, 3:21 PM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Somerset	39 min
Aug 6, 3:55 PM EDT	Special Weather Statement	PHI	Hunterdon, Middlesex, Morris, Somerset	50 min
Aug 6, 4:40 PM EDT	Special Weather Statement	PHI	Middlesex, Monmouth	50 min
Aug 6, 5:40 PM EDT	Special Weather Statement	PHI	Mercer	50 min
Aug 6, 5:41 PM EDT	Special Weather Statement	PHI	Monmouth	49 min
Aug 6, 6:32 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	4 hr
Aug 6, 6:52 PM EDT	Special Weather Statement	PHI	Mercer	23 min
Aug 6, 7:10 PM EDT	Special Weather Statement	PHI	Ocean	50 min
Aug 6, 7:33 PM EDT	Special Marine Warning	PHI		57 min
Aug 6, 7:40 PM EDT	Special Weather Statement	PHI	Ocean	35 min
Aug 6, 4:26 PM EDT	Special Weather Statement	PHI	Lehigh	34 min
Aug 6, 4:30 PM EDT	Special Weather Statement	PHI	Berks	30 min
Aug 6, 4:51 PM EDT	Special Weather Statement	PHI	Montgomery	24 min
Aug 6, 4:55 PM EDT	Special Weather Statement	PHI	Lehigh	35 min
Aug 6, 4:59 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	46 min
Aug 6, 5:26 PM EDT	Special Weather Statement	PHI	Berks	34 min
Aug 6, 6:25 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery, Philadelphia	35 min
Aug 6, 6:49 PM EDT	Special Weather Statement	PHI	Kent	26 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.