Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

August 9, 2012Berks County, Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 9, 2012, 8:24 PM EDT for Berks County, Lehigh County, Pennsylvania. It was in force for 66 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 9, 2012, 8:24 PM EDT (00:24 UTC)
Expired: Aug 9, 2012, 9:30 PM EDT
In force: 66 min
Issued by: NWS Philadelphia/Mount Holly

Counties Berks County, PA, Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 131 km from the middle of the area, began a volume at 00:27 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.

What was reported inside it

Time	Report	Where	Remark
Aug 9, 8:30 PM EDT	TSTM WND DMG	Maiden Creek, PA	TREE DOWN.
Aug 9, 9:00 PM EDT	TSTM WND DMG	Rockland Twp, PA	WIRES DOWN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.4 hours before the alert went out and 237 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: 349 J/kg
Mixed-layer CIN: -144 J/kg
Mixed-layer LCL: 1386 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

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

385 
WWUS81 KPHI 100024
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
824 PM EDT THU AUG 9 2012

PAZ054-060>062-100130-
BERKS PA-CARBON PA-LEHIGH PA-NORTHAMPTON PA-
824 PM EDT THU AUG 9 2012

...STRONG THUNDERSTORMS WILL AFFECT BERKS...CARBON...LEHIGH AND
NORTHAMPTON COUNTIES...

AT 818 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 16 MILES SOUTHWEST
OF LEHIGHTON TO 12 MILES NORTH OF READING TO READING...MOVING EAST AT
20 MPH. THE THUNDERSTORMS WILL BE NEAR WANAMAKERS...ST. LAWRENCE
AROUND 830 PM...NEW TRIPOLI...JORDAN VALLEY AROUND 845 PM...
EMERALD...CLAUSSVILLE AROUND 900 PM...WALNUTPORT...SLATINGTON AROUND
915 PM...COPLAY AND NORTHAMPTON AROUND 930 PM.

VERY HEAVY RAIN WILL FALL FROM THESE STORMS...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL POOR DRAINAGE AREAS.

WIND GUSTS TO 40 MPH AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STORMS. DO
NOT SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS
WHEN A THUNDERSTORM APPROACHES.

LAT...LON 4055 7595 4068 7591 4071 7581 4074 7577
      4077 7580 4084 7549 4081 7547 4084 7536
      4066 7540 4042 7548 4044 7553 4037 7559
      4027 7598

$$

FORECASTER: HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 10:51 PM EDT	Special Weather Statement	PHI	Sussex	54 min
Aug 10, 4:00 AM EDT	Small Craft Advisory	PHI		50 hr
Aug 10, 8:41 AM EDT	Special Weather Statement	PHI	Gloucester, Hunterdon, Salem, Sussex, Warren	94 min
Aug 10, 8:43 AM EDT	Special Weather Statement	PHI	Gloucester, Hunterdon, Salem, Sussex, Warren	92 min
Aug 10, 9:08 AM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Cumberland, Gloucester, Hunterdon, Mercer and 5 more	3 hr
Aug 10, 10:05 AM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	115 min
Aug 10, 10:19 AM EDT	Special Marine Warning	PHI		86 min
Aug 10, 10:33 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 8 more	4 hr
Aug 10, 10:51 AM EDT	Special Marine Warning	PHI		84 min
Aug 10, 10:58 AM EDT	Special Marine Warning	PHI		62 min
Aug 10, 11:41 AM EDT	Special Marine Warning	PHI		2 hr
Aug 10, 12:10 PM EDT	Special Weather Statement	PHI	Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Morris and 2 more	80 min
Aug 9, 9:24 PM EDT	Special Weather Statement	PHI	Monroe	96 min
Aug 9, 10:05 PM EDT	Special Weather Statement	PHI	Berks	55 min
Aug 9, 10:09 PM EDT	Areal Flood Advisory	PHI	Monroe	98 min
Aug 9, 10:25 PM EDT	Flash Flood Warning	PHI	Monroe	83 min
Aug 10, 7:40 AM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Chester, Lehigh, Monroe, Montgomery and 1 more	3 hr
Aug 10, 8:55 AM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	65 min
Aug 10, 10:14 AM EDT	Severe Thunderstorm Warning	PHI	Sussex	61 min

Nearby

Special Weather Statements in Pennsylvania, 2012 Every special weather statement in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.