Alert archive / Pennsylvania / Flash Flood Warnings in 2019

Flash Flood Warning 84, NWS Philadelphia/Mount Holly

October 31, 2019Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Oct 31, 2019, 9:41 PM EDT for Berks County, Pennsylvania. It was in force for 4 hr. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Oct 31, 2019, 9:41 PM EDT (01:41 UTC)
Expired
Nov 1, 2019, 1:45 AM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 158 km from the middle of the area, began a volume at 01:43 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.

What was reported inside it

TimeReportWhereRemark
Oct 31, 9:45 PM EDTFLASH FLOODBethel, PAFLASH FLOODING ON WESTBOUND INTERSTATE 78 NEAR MILE MARKER 10 IN BETHEL TWP. CLOSURE WILL BE REQUIRED.
Oct 31, 10:06 PM EDTFLASH FLOOD3 Nnw Bethel, PAMUD AND ROCKS DEPOSITED ON LANCASTER AVENUE, FORCING ITS CLOSURE.
Oct 31, 10:44 PM EDTFLASH FLOODLeesport, PANORTH CENTRE AVENUE CLOSED FROM FLASH FLOODING.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 1.7 hours before the alert went out and 207 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 2019-11-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 529 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 2019-11-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 623 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
529 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
827 m above ground
0-6 km bulk shear
72 kt
0-1 km storm-relative helicity
623 m²/s²
0-3 km storm-relative helicity
752 m²/s²
Significant tornado parameter
2.5
Supercell composite
9.8

Open this sounding in Storm Lab

The text

As transmitted.

702 
WGUS51 KPHI 010141
FFWPHI
PAC011-010545-
/O.NEW.KPHI.FF.W.0084.191101T0141Z-191101T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
941 PM EDT Thu Oct 31 2019

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Central Berks County in eastern Pennsylvania...

* Until 145 AM EDT.

* At 941 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Flash flooding is expected to
  begin shortly in the areas of heaviest rain.

* Some locations that could experience flooding include...
  Reading, Wyomissing, Kutztown, Hamburg, Fleetwood, Sinking Spring,
  Laureldale, Womelsdorf, Wernersville, Newmanstown, Leesport,
  Adamstown, Shoemakersville, Bernville, Strausstown, Lenhartsville,
  Spring Ridge, Fairview Hgts, Shillington and West Reading.

This includes Interstate 78 in Pennsylvania between mile markers 10
and 44.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4049 7643 4052 7635 4052 7625 4058 7605
      4057 7602 4063 7599 4066 7595 4068 7589
      4058 7574 4022 7601 4036 7621

$$

CMS
3 follow-up statements
714 
WGUS71 KPHI 010304
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1104 PM EDT Thu Oct 31 2019

PAC011-010545-
/O.CON.KPHI.FF.W.0084.000000T0000Z-191101T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-
1104 PM EDT Thu Oct 31 2019

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 145 AM EDT FOR
CENTRAL BERKS COUNTY...

At 1101 PM EDT, local law enforcement reported flash flooding in 
much of western Berks County. Portions of westbound Interstate 78 
have been closed near mile marker 10. A rock slide was reported on 
Lancaster Avenue in Bethel Township. Roads have been closed in 
Leesport as well. Flash flooding will continue for the next few 
hours.

Some locations that could experience flooding include...
Reading, Wyomissing, Kutztown, Hamburg, Fleetwood, Sinking Spring,
Laureldale, Womelsdorf, Wernersville, Newmanstown, Leesport,
Adamstown, Shoemakersville, Bernville, Strausstown, Lenhartsville,
Spring Ridge, Fairview Hgts, Shillington and West Reading.

This includes Interstate 78 in Pennsylvania between mile markers 10
and 44.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4049 7643 4052 7635 4052 7625 4058 7605
      4057 7602 4063 7599 4066 7595 4068 7589
      4058 7574 4022 7601 4036 7621

$$

CMS
293 
WGUS71 KPHI 010458
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1258 AM EDT Fri Nov 1 2019

PAC011-010545-
/O.CON.KPHI.FF.W.0084.000000T0000Z-191101T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-
1258 AM EDT Fri Nov 1 2019

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 145 AM EDT FOR
CENTRAL BERKS COUNTY...

At 1257 AM EDT, local law enforcement reported flash flooding in 
Bethel Township. Although the heaviest rainfall has ended, it will 
take some time for runoff to subside. Be cautious traveling 
overnight.

Some locations that could experience flooding include...
Reading, Wyomissing, Kutztown, Hamburg, Fleetwood, Sinking Spring,
Laureldale, Womelsdorf, Wernersville, Newmanstown, Leesport,
Adamstown, Shoemakersville, Bernville, Strausstown, Lenhartsville,
Spring Ridge, Fairview Hgts, Shillington and West Reading.

This includes Interstate 78 in Pennsylvania between mile markers 10
and 44.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4049 7643 4052 7635 4052 7625 4058 7605
      4057 7602 4063 7599 4066 7595 4068 7589
      4058 7574 4022 7601 4036 7621

$$

CMS
917 
WGUS71 KPHI 010544
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
144 AM EDT Fri Nov 1 2019

PAC011-010553-
/O.EXP.KPHI.FF.W.0084.000000T0000Z-191101T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-
144 AM EDT Fri Nov 1 2019

...THE FLASH FLOOD WARNING FOR CENTRAL BERKS COUNTY WILL EXPIRE AT
145 AM EDT...

An areal flood warning has been issued for this area until 545 am. 
Please continue to heed any road closures.

LAT...LON 4049 7643 4052 7635 4052 7625 4058 7605
      4057 7602 4063 7599 4066 7595 4068 7589
      4058 7574 4022 7601 4036 7621

$$

CMS

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 31, 8:11 PM EDTSevere Thunderstorm WarningPHIBerks, Carbon, Lehigh64 min
Oct 31, 8:58 PM EDTSevere Thunderstorm WarningPHIBerks, Carbon, Lehigh, Monroe, Northampton62 min
Oct 31, 9:35 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Montgomery55 min
Oct 31, 9:56 PM EDTAreal Flood AdvisoryPHICarbon, Monroe4 hr
Oct 31, 9:56 PM EDTSevere Thunderstorm WarningPHICarbon, Lehigh, Monroe, Northampton64 min
Oct 31, 10:23 PM EDTSevere Thunderstorm WarningPHIBucks, Chester, Montgomery67 min
Oct 31, 10:43 PM EDTSevere Thunderstorm WarningPHIMonroe, Northampton77 min
Oct 31, 10:45 PM EDTAreal Flood AdvisoryPHIBerks, Bucks, Chester, Lehigh, Montgomery, Northampton4 hr
Oct 31, 11:08 PM EDTFlash Flood WarningPHIBerks, Bucks, Chester, Lehigh, Montgomery, Northampton4 hr
Oct 31, 11:14 PM EDTFlash Flood WarningPHICarbon, Monroe, Northampton4 hr
Oct 31, 11:15 PM EDTSevere Thunderstorm WarningPHIBucks, Chester, Delaware, Montgomery, Philadelphia60 min
Oct 31, 11:32 PM EDTTornado WarningPHIChester, Delaware, Montgomery, Philadelphia14 min
Oct 31, 11:54 PM EDTSevere Thunderstorm WarningPHIBucks66 min
Oct 31, 11:54 PM EDTTornado WarningPHIBucks36 min
Nov 1, 1:43 AM EDTAreal Flood WarningPHIBerks4 hr
Nov 1, 2:28 AM EDTRiver Flood WarningPHIChester4 hr
Nov 1, 3:02 AM EDTAreal Flood WarningPHIBerks, Bucks, Chester, Lehigh, Montgomery, Northampton5 hr
Nov 1, 3:06 AM EDTAreal Flood WarningPHICarbon, Monroe, Northampton4 hr
Nov 1, 3:31 AM EDTFreeze WatchPHIBerks, Bucks, Chester, Lehigh, Montgomery, Northampton6 hr
Nov 1, 9:12 AM EDTFreeze WarningPHIBerks, Bucks, Chester, Delaware, Lehigh, Montgomery and 1 more25 hr
Nov 1, 3:16 PM EDTFrost AdvisoryPHIPhiladelphia19 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2019Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.