Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

August 14, 2012Berks County, Chester County, Pennsylvania; Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 14, 2012, 11:40 PM EDT for Berks County, Chester County, Pennsylvania; Cecil County, Maryland. It was in force for 95 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 14, 2012, 11:40 PM EDT (03:40 UTC)
Expired: Aug 15, 2012, 1:15 AM EDT
In force: 95 min
Issued by: NWS Philadelphia/Mount Holly

Counties Cecil County, MD, Berks County, PA, Chester County, PA

The radar

The Philadelphia radar (KDIX), 130 km from the middle of the area, began a volume at 03:40 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, 3.7 hours before the alert went out and 167 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: 833 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 1690 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 59 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.

708 
WWUS81 KPHI 150340
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1140 PM EDT TUE AUG 14 2012

MDZ008-012-PAZ060-067-150515-
BERKS PA-CECIL MD-CHESTER PA-KENT MD-
1140 PM EDT TUE AUG 14 2012

...STRONG THUNDERSTORMS WILL AFFECT BERKS...CECIL...CHESTER AND KENT
COUNTIES...

AT 1135 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 27 MILES WEST OF
READING TO 8 MILES NORTH OF BALTIMORE...MOVING EAST AT 25 MPH. THE
THUNDERSTORMS WILL BE NEAR WOMELSDORF AROUND MIDNIGHT...
WERNERSVILLE...BERNVILLE AROUND 1215 AM...LEESPORT...WEST NOTTINGHAM
AROUND 1230 AM...FLEETWOOD...WOODLAWN AROUND 1245 AM...LYONS AND
GALENA AROUND 100 AM.

HEAVY RAIN IS POSSIBLE WITH THESE STORMS AS WELL AS GUSTY WINDS, 
SMALL HAIL, AND DANGEROUS CLOUD TO GROUND LIGHTNING.

LAT...LON 4049 7560 4032 7563 4024 7570 4024 7565
      3931 7586 3932 7619 3942 7601 3952 7599
      3954 7607 3972 7623 3974 7610 3988 7600
      3998 7599 4003 7594 4011 7595 4014 7589
      4048 7641

$$

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 15, 1:57 AM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	63 min
Aug 15, 2:00 AM EDT	Special Weather Statement	PHI	Warren	90 min
Aug 15, 2:13 AM EDT	Special Weather Statement	PHI	Sussex	62 min
Aug 15, 3:10 AM EDT	Areal Flood Advisory	PHI	Sussex	111 min
Aug 15, 3:22 AM EDT	Special Weather Statement	PHI	Sussex	53 min
Aug 15, 2:38 PM EDT	Special Weather Statement	PHI	Monmouth	52 min
Aug 15, 2:53 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	52 min
Aug 15, 2:58 PM EDT	Special Weather Statement	PHI	Atlantic	62 min
Aug 15, 3:17 PM EDT	Special Marine Warning	PHI		43 min
Aug 15, 3:23 PM EDT	Special Weather Statement	PHI	Sussex	52 min
Aug 15, 3:25 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex	65 min
Aug 15, 4:14 PM EDT	Areal Flood Warning	PHI	Monmouth	3 hr
Aug 15, 4:24 PM EDT	Special Weather Statement	PHI	Atlantic	66 min
Aug 15, 4:33 PM EDT	Special Weather Statement	PHI	Morris, Sussex, Warren	87 min
Aug 15, 4:45 PM EDT	Special Weather Statement	PHI	Ocean	90 min
Aug 15, 5:22 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth	38 min
Aug 15, 5:28 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	34 min
Aug 15, 5:48 PM EDT	Special Weather Statement	PHI	Middlesex	57 min
Aug 15, 5:58 PM EDT	Special Weather Statement	PHI	Mercer	62 min
Aug 15, 6:06 PM EDT	Special Weather Statement	PHI	Monmouth	84 min
Aug 15, 6:19 PM EDT	Areal Flood Warning	PHI	Mercer, Middlesex, Monmouth, Ocean	118 min
Aug 15, 6:50 PM EDT	Areal Flood Warning	PHI	Morris	87 min
Aug 15, 6:58 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cumberland, Gloucester	62 min
Aug 14, 11:10 PM EDT	Special Weather Statement	PHI	Berks	80 min
Aug 15, 12:28 AM EDT	Special Weather Statement	PHI	Berks, Lehigh, Montgomery	92 min
Aug 15, 12:49 AM EDT	Areal Flood Advisory	PHI	Berks, Chester, Lehigh, Montgomery	3 hr
Aug 15, 1:26 AM EDT	Special Weather Statement	PHI	Bucks, Montgomery	94 min
Aug 15, 1:28 AM EDT	Special Weather Statement	PHI	Carbon, Monroe	62 min
Aug 15, 1:48 AM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery	85 min
Aug 14, 10:37 PM EDT	Special Weather Statement	PHI	Kent	53 min
Aug 15, 6:55 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Talbot	49 min
Aug 15, 7:16 PM EDT	Severe Thunderstorm Warning	PHI	Queen Anne's, Talbot	35 min

Nearby

Special Weather Statements in Pennsylvania, 2012 Special Weather Statements in Maryland, 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.