Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

July 29, 2012Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 29, 2012, 8:17 PM EDT for Berks County, Pennsylvania. It was in force for 58 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 29, 2012, 8:17 PM EDT (00:17 UTC)
Expired
Jul 29, 2012, 9:15 PM EDT
In force
58 min
Issued by
NWS Philadelphia/Mount Holly

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 153 km from the middle of the area, began a volume at 00:17 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, 0.3 hours before the alert went out and 215 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-pSkew-T log-p diagram, Washington/Dulle, VA at 00:00Z on 2012-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 676 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2012-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
676 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
1462 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
4 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

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

217 
WWUS81 KPHI 300017
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
817 PM EDT SUN JUL 29 2012

PAZ060-300115-
BERKS PA-
817 PM EDT SUN JUL 29 2012

...A SMALL AREA OF SHOWERS PRODUCING HEAVY RAINFALL WILL AFFECT 
BERKS COUNTY...

AT 811 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
SMALL AREA OF SHOWERS PRODUCING HEAVY RAINFALL 20 MILES SOUTHWEST OF 
LEHIGHTON...MOVING SOUTH AT 10 MPH. THE SHOWER WILL BE NEAR HAMBURG 
AROUND 855 PM AND CENTERPORT AROUND 915 PM.

AS MUCH AS AN INCH OF RAIN COULD FALL WITHIN 45 MINUTES. THIS MUCH 
RAIN COULD RESULT IN LOCALIZED STREET FLOODING.

WIND GUSTS TO 35 MPH AND A RUMBLE OF THUNDER ARE POSSIBLE.

LAT...LON 4057 7611 4057 7608 4058 7606 4058 7602
      4063 7601 4065 7599 4067 7592 4067 7591
      4039 7580 4034 7614 4055 7616

$$

HAYES

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 11:30 AM EDTCoastal Flood StatementPHIAtlantic, Burlington, Cape May, Cumberland, Monmouth, Ocean and 1 more13 hr
Jul 30, 7:55 PM EDTSpecial Weather StatementPHILehigh, Monroe, Northampton65 min

Nearby

Special Weather Statements in Pennsylvania, 2012Every 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.