Alert archive / Pennsylvania / Areal Flood Advisories in 2019

Areal Flood Advisory 187, NWS Philadelphia/Mount Holly

August 2, 2019Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood advisory at Aug 2, 2019, 7:46 PM EDT for Berks County, Pennsylvania. It was in force for 108 min.

The area

The counties it named.

The facts

Issued
Aug 2, 2019, 7:46 PM EDT (23:46 UTC)
Expired
Aug 2, 2019, 9:34 PM EDT
In force
108 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 139 km from the middle of the area, began a volume at 23:47 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, 11.8 hours before the alert went out and 206 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 2019-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 457 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 2019-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -54 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
457 J/kg
Mixed-layer CIN
-73 J/kg
Mixed-layer LCL
870 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-54 m²/s²
0-3 km storm-relative helicity
-36 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 5:49 PM EDTSpecial Weather StatementPHICarbon26 min
Aug 2, 5:57 PM EDTSpecial Weather StatementPHIBerks33 min
Aug 2, 7:01 PM EDTSpecial Weather StatementPHICarbon29 min
Aug 2, 7:03 PM EDTSpecial Weather StatementPHIBerks27 min
Aug 2, 7:39 PM EDTSpecial Weather StatementPHIBerks36 min

Nearby

Areal Flood Advisories in Pennsylvania, 2019Every areal flood advisory in 2019

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.