Alert archive / Pennsylvania / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

July 6, 2011Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 6, 2011, 4:01 PM EDT for Bucks County, Pennsylvania. It was in force for 59 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 6, 2011, 4:01 PM EDT (20:01 UTC)
Expired: Jul 6, 2011, 5:00 PM EDT
In force: 59 min
Issued by: NWS Philadelphia/Mount Holly

County Bucks County, PA

The radar

The Philadelphia radar (KDIX), 47 km from the middle of the area, began a volume at 20:01 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.0 hours before the alert went out and 132 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: 721 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 1270 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

941 
WWUS81 KPHI 062001
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
401 PM EDT WED JUL 6 2011

PAZ068-069-071-062100-
BUCKS PA-MONTGOMERY PA-PHILADELPHIA PA-
401 PM EDT WED JUL 6 2011

...STRONG THUNDERSTORMS WILL AFFECT BUCKS...MONTGOMERY AND
PHILADELPHIA COUNTIES...

AT 357 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 7 MILES WEST OF TRENTON...MOVING EAST AT 15 MPH.
THE THUNDERSTORM WILL BE NEAR MORRISVILLE AND TULLYTOWN AROUND 415
PM.

VERY HEAVY RAIN WILL FALL FROM THE STORMS...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM.

EXPECT INTENSE LIGHTNING FROM THIS STORM. DO NOT SEEK SHELTER UNDER
TREES WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A THUNDERSTORM
APPROACHES.

TAKE ROADWAYS THAT ARE NOT PRONE TO POOR DRAINAGE FLOODING.

LAT...LON 4013 7478 4012 7483 4009 7486 4009 7512
      4030 7508 4031 7490 4030 7487 4024 7484
      4023 7480 4019 7476 4012 7476

$$

TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 12:34 PM EDT	Special Weather Statement	PHI	Atlantic	56 min
Jul 6, 1:13 PM EDT	Special Marine Warning	PHI		92 min
Jul 6, 1:23 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Salem	52 min
Jul 6, 1:30 PM EDT	Special Marine Warning	PHI		90 min
Jul 6, 1:47 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth	58 min
Jul 6, 2:26 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Monmouth, Ocean	46 min
Jul 6, 2:40 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	62 min
Jul 6, 2:57 PM EDT	Special Marine Warning	PHI		93 min
Jul 6, 3:23 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	67 min
Jul 6, 4:02 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Monmouth	118 min
Jul 6, 4:32 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Monmouth, Ocean	58 min
Jul 6, 5:00 PM EDT	Areal Flood Advisory	PHI	Burlington	4 hr
Jul 6, 5:18 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	42 min
Jul 6, 5:38 PM EDT	Special Marine Warning	PHI		82 min
Jul 6, 6:14 PM EDT	Special Weather Statement	PHI	Ocean	91 min
Jul 6, 7:03 PM EDT	Flash Flood Warning	PHI	Burlington	2 hr
Jul 6, 4:46 PM EDT	Special Weather Statement	PHI	Montgomery	89 min
Jul 6, 12:33 PM EDT	Special Weather Statement	PHI	Kent	87 min
Jul 6, 1:14 PM EDT	Special Weather Statement	PHI	Sussex	91 min
Jul 6, 2:41 PM EDT	Areal Flood Advisory	PHI	Sussex	75 min

Nearby

Special Weather Statements in Pennsylvania, 2011 Every special weather statement in 2011

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.