Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

August 14, 2012Berks County, Carbon County, Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 14, 2012, 7:25 AM EDT for Berks County, Carbon County, Lehigh County, Pennsylvania. 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, 7:25 AM EDT (11:25 UTC)
Expired: Aug 14, 2012, 9:00 AM EDT
In force: 95 min
Issued by: NWS Philadelphia/Mount Holly

Counties Berks County, PA, Carbon County, PA, Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 154 km from the middle of the area, began a volume at 11:27 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.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 11.4 hours before the alert went out and 244 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: 20 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 2056 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 99 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.

819 
WWUS81 KPHI 141125
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
725 AM EDT TUE AUG 14 2012

PAZ054-055-060>062-141300-
BERKS PA-CARBON PA-LEHIGH PA-MONROE PA-NORTHAMPTON PA-
725 AM EDT TUE AUG 14 2012

...A BROKEN LINE OF STRONG THUNDERSTORMS WILL AFFECT 
BERKS...CARBON...LEHIGH...MONROE AND NORTHAMPTON COUNTIES...

AT 722 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
SEVERAL STRONG THUNDERSTORMS ALONG A BROKEN LINE 14 MILES NORTHWEST 
OF READING TO 5 MILES NORTHWEST OF WANAMAKERS...MOVING NORTHEAST AT 
20 MPH. 

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

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM WITH A FEW CLOUD 
TO GROUND LIGHTNING STRIKES.

LAT...LON 4088 7521 4024 7605 4049 7643 4050 7643
      4052 7624 4058 7602 4065 7599 4074 7577
      4091 7600 4101 7575 4108 7578 4114 7570
      4113 7564 4122 7555

$$

FORECASTER: HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 9:22 AM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester, Salem	38 min
Aug 14, 9:44 AM EDT	Special Weather Statement	PHI	Hunterdon, Mercer	91 min
Aug 14, 10:07 AM EDT	Special Weather Statement	PHI	Camden, Gloucester, Salem	83 min
Aug 14, 11:42 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Gloucester	3 hr
Aug 14, 2:35 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Ocean	78 min
Aug 14, 3:46 PM EDT	Flash Flood Warning	PHI	Atlantic, Burlington, Ocean	2 hr
Aug 14, 6:02 AM EDT	Special Weather Statement	PHI	Carbon	88 min
Aug 14, 8:06 AM EDT	Special Weather Statement	PHI	Chester, Lehigh	84 min
Aug 14, 8:39 AM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	2 hr
Aug 14, 9:56 AM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	108 min
Aug 14, 4:12 PM EDT	Special Weather Statement	PHI	Delaware	63 min
Aug 14, 4:15 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	60 min
Aug 14, 12:49 PM EDT	Special Weather Statement	PHI	Sussex	56 min
Aug 14, 2:13 PM EDT	Areal Flood Advisory	PHI	Kent	79 min
Aug 14, 2:28 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	2 hr
Aug 14, 3:01 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	38 min
Aug 14, 3:22 PM EDT	Special Weather Statement	PHI	New Castle	53 min
Aug 14, 4:54 PM EDT	Special Weather Statement	PHI	Kent	66 min
Aug 14, 6:44 PM EDT	Special Weather Statement	PHI	Sussex	61 min
Aug 14, 7:42 AM EDT	Special Weather Statement	PHI	Kent	63 min
Aug 14, 2:02 PM EDT	Special Weather Statement	PHI	Queen Anne's	58 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.