Alert archive / Pennsylvania / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

August 1, 2021Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 1, 2021, 7:18 PM EDT for Berks County, Pennsylvania. It was in force for 27 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 1, 2021, 7:18 PM EDT (23:18 UTC)
Expired
Aug 1, 2021, 7:45 PM EDT
In force
27 min
Issued by
NWS Philadelphia/Mount Holly

County Berks County, PA

The radar

The State College radar (KCCX), 157 km from the middle of the area, began a volume at 23:21 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 12:00Z, 11.3 hours before the alert went out and 195 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 12:00Z on 2021-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 222 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 12:00Z on 2021-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 square meters per square second.1939587897Sfc1 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
222 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
612 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
42 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

259 
WWUS81 KPHI 012318
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
718 PM EDT Sun Aug 1 2021

PAZ060-012345-
Berks-
718 PM EDT Sun Aug 1 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT WEST CENTRAL BERKS
COUNTY...

At 717 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Strausstown to near Sand Hill.
Movement was east at 35 mph.

Wind gusts up to 40 mph are possible with these storms.

Locations impacted include...
Womelsdorf, Wernersville, Robesonia, Leesport, Shoemakersville,
Bernville, Strausstown, Fairview Hgts and Centerport.

This includes Interstate 78 in Pennsylvania between mile markers 10
and 25.
 
LAT...LON 4049 7643 4051 7637 4052 7625 4053 7622
      4051 7592 4029 7611 4036 7621
TIME...MOT...LOC 2317Z 279DEG 29KT 4052 7627 4038 7639 

$$

Staarmann

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 1, 6:19 PM EDTSevere Thunderstorm WarningPHICarbon, Monroe41 min
Aug 1, 7:50 PM EDTSpecial Weather StatementPHIBerks40 min

Nearby

Special Weather Statements in Pennsylvania, 2021Every special weather statement in 2021

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.