Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

July 19, 2012Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 19, 2012, 10:01 PM EDT for Berks 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 19, 2012, 10:01 PM EDT (02:01 UTC)
Expired: Jul 19, 2012, 11:00 PM EDT
In force: 59 min
Issued by: NWS Philadelphia/Mount Holly

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 137 km from the middle of the area, began a volume at 02:01 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 2.0 hours before the alert went out and 165 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: 525 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 1690 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 47 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.

574 
WWUS81 KPHI 200201
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1001 PM EDT THU JUL 19 2012

MDZ008-PAZ060-061-067-200300-
BERKS PA-CECIL MD-CHESTER PA-LEHIGH PA-
1001 PM EDT THU JUL 19 2012

...THUNDERSTORMS WILL AFFECT BERKS...CECIL...CHESTER AND 
LEHIGH COUNTIES...

AT 953 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
LINE OF SHOWERS WITH EMBEDDED THUNDERSTORMS FROM ABOUT 10 MILES 
NORTHWEST OF READING TO ABOUT 25 MILES NORTH OF BALTIMORE...MOVING 
EAST AT 20 MPH. THE THUNDERSTORMS WILL BE NEAR WYOMISSING HILLS AND 
WYOMISSING AROUND 1015 PM...LYONS AND KUTZTOWN AROUND 1030 
PM...TOPTON AND ALBURTIS AROUND 1045 PM...AND BECHTELSVILLE AND 
RISING SUN AROUND 1100 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 ABOUT 30 MPH AND DANGEROUS CLOUD TO GROUND LIGHTNING 
ARE EXPECTED WITH THE STRONGEST STORMS. IF YOU HEAR THUNDER OR SEE 
LIGHTNING...PLEASE MOVE INDOORS. 

LAT...LON 3974 7610 3979 7605 3985 7603 3988 7600
      3998 7599 4003 7594 4011 7595 4014 7589
      4034 7620 4054 7607 4055 7548 3962 7609
      3962 7614 3972 7623

$$

MPD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 2:21 AM EDT	Special Marine Warning	PHI		84 min
Jul 20, 3:01 AM EDT	Special Weather Statement	PHI	Cape May	59 min
Jul 20, 5:43 AM EDT	Special Weather Statement	PHI	Camden	92 min
Jul 20, 5:44 AM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	63 min
Jul 20, 7:28 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington	3 hr
Jul 20, 7:56 AM EDT	Areal Flood Advisory	PHI	Cape May	2 hr
Jul 20, 8:52 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Ocean	3 hr
Jul 20, 1:20 PM EDT	Special Weather Statement	PHI	Ocean	55 min
Jul 20, 3:16 PM EDT	Coastal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Cumberland, Middlesex, Monmouth and 1 more	9 hr
Jul 20, 5:03 AM EDT	Areal Flood Advisory	PHI	Bucks, Delaware, Montgomery, Philadelphia	105 min
Jul 19, 10:58 PM EDT	Special Weather Statement	PHI	Kent, New Castle, Sussex	2 hr
Jul 20, 1:58 AM EDT	Special Weather Statement	PHI	Sussex	62 min
Jul 19, 9:07 PM EDT	Special Weather Statement	PHI	Queen Anne's	53 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.