Alert archive / Pennsylvania / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

May 23, 2011Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at May 23, 2011, 5:47 PM EDT for Berks County, Pennsylvania. It was in force for 43 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: May 23, 2011, 5:47 PM EDT (21:47 UTC)
Expired: May 23, 2011, 6:30 PM EDT
In force: 43 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 21:50 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.8 hours before the alert went out and 111 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 530 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: 11 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.

837 
WWUS81 KPHI 232147
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
547 PM EDT MON MAY 23 2011

PAZ060-232230-
BERKS PA-
547 PM EDT MON MAY 23 2011

...A STRONG THUNDERSTORM WILL AFFECT BERKS COUNTY...

AT 546 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 11 MILES SOUTHWEST OF READING...MOVING NORTHEAST
AT 45 MPH. THE THUNDERSTORM WILL BE NEAR WEST WYOMISSING...
SHILLINGTON...MOHNTON...WHITFIELD AROUND 555 PM...WYOMISSING...WEST
READING...WEST LAWN...WYOMISSING HILLS AROUND 600 PM...LAURELDALE AND
TEMPLE AROUND 605 PM.

WIND GUSTS TO 40 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.

LAT...LON 4052 7634 4052 7630 4054 7618 4059 7605
      4058 7602 4064 7600 4068 7590 4044 7553
      4024 7570 4014 7589 4032 7616 4036 7621
      4037 7624 4050 7644

$$

PO

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 11:07 AM EDT	Special Weather Statement	PHI	Atlantic	53 min
May 23, 7:58 PM EDT	Tornado Warning	PHI	Hunterdon, Warren	32 min
May 23, 5:35 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	55 min
May 23, 6:21 PM EDT	Special Weather Statement	PHI	Berks, Chester, Montgomery	54 min
May 23, 6:30 PM EDT	Special Weather Statement	PHI	Carbon, Northampton	60 min
May 23, 7:22 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	38 min
May 23, 7:30 PM EDT	Tornado Warning	PHI	Carbon, Lehigh, Monroe, Northampton	30 min

Nearby

Special Weather Statements in Pennsylvania, 2011 Every special weather statement in 2011

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.