Alert archive / Pennsylvania / Flash Flood Warnings in 2019

Flash Flood Warning 6, NWS Philadelphia/Mount Holly

May 29, 20195 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at May 29, 2019, 4:55 PM EDT for 5 counties in 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
May 29, 2019, 4:55 PM EDT (20:55 UTC)
Expired
May 29, 2019, 8:45 PM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Berks County, PA, Bucks County, PA, Chester County, PA, Lehigh County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 140 km from the middle of the area, began a volume at 20:59 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
May 29, 5:47 PM EDTFLASH FLOOD1 Nnw Reading, PADELAYED REPORT. VEHICLE STUCK IN WATER REQUIRING RESCUE NEAR INTERSECTION OF CHURCH STREET AND WOODWARD STREET.
May 29, 7:00 PM EDTFLASH FLOOD1 Sse Marlborough Twp, PACORRECTS PREVIOUS TSTM WND DMG REPORT FROM 1 SSE MARLBOROUGH TWP. SEVERAL ROADS IMPASSABLE IN SUMNEYTOWN.
May 29, 7:00 PM EDTFLASH FLOOD2 E Oley, PAWATER RESCUE AT INTERSECTION OF BERTOLET MILL ROAD AND SNYDER ROAD IN OLEY TWP.

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 12:00Z, 8.9 hours before the alert went out and 212 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 2019-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 292 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2019-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 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
292 J/kg
Mixed-layer CIN
-123 J/kg
Mixed-layer LCL
1463 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
30 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

856 
WGUS51 KPHI 292055
FFWPHI
PAC011-017-029-077-091-300045-
/O.NEW.KPHI.FF.W.0006.190529T2055Z-190530T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
455 PM EDT Wed May 29 2019

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Berks County in eastern Pennsylvania...
  Northwestern Montgomery County in southeastern Pennsylvania...
  Southeastern Lehigh County in eastern Pennsylvania...
  Northwestern Bucks County in southeastern Pennsylvania...
  Northern Chester County in southeastern Pennsylvania...

* Until 845 PM EDT.

* At 449 PM EDT, Doppler radar indicated several rounds of 
  thunderstorms producing heavy rain across the warned area. These 
  storms will move over some of the same areas that received heavy 
  rain earlier this afternoon. Flash flooding is likely in areas 
  that receive repetitive rounds of heavy rain.

* Some locations that could experience flooding include...
  Allentown, Reading, Pottstown, Emmaus, Wyomissing, Quakertown,
  Birdsboro, Kutztown, Hamburg, Fleetwood, Sinking Spring,
  Laureldale, East Greenville, Womelsdorf, Wernersville, Newmanstown,
  Topton, Robesonia, Leesport and Adamstown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

&&

LAT...LON 4052 7634 4052 7625 4058 7605 4057 7602
      4061 7600 4056 7536 4054 7533 4055 7531
      4053 7509 4021 7565 4024 7604 4036 7621
      4037 7623 4049 7643

$$

Kruzdlo
2 follow-up statements
459 
WGUS71 KPHI 292245
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
645 PM EDT Wed May 29 2019

PAC011-017-029-077-091-300045-
/O.CON.KPHI.FF.W.0006.000000T0000Z-190530T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Montgomery PA-Lehigh PA-Bucks PA-Chester PA-
645 PM EDT Wed May 29 2019

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM EDT FOR
BERKS...NORTHWESTERN MONTGOMERY...SOUTHEASTERN LEHIGH...NORTHWESTERN
BUCKS AND NORTHERN CHESTER COUNTIES...

At 644 PM EDT, Doppler radar indicated the heaviest rain was coming 
to an end. Although the heavy rain was ending, runoff will continue 
into the evening. The flash flood warning remains in effect until 
845 pm. 

Some locations that could experience flooding include...
Allentown, Reading, Pottstown, Emmaus, Wyomissing, Quakertown,
Birdsboro, Kutztown, Hamburg, Fleetwood, Sinking Spring, Laureldale,
East Greenville, Womelsdorf, Wernersville, Newmanstown, Topton,
Robesonia, Leesport and Adamstown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

&&

LAT...LON 4052 7634 4052 7625 4058 7605 4057 7602
      4061 7600 4056 7536 4054 7533 4055 7531
      4053 7509 4021 7565 4024 7604 4036 7621
      4037 7623 4049 7643

$$

Kruzdlo
161 
WGUS71 KPHI 300039
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
839 PM EDT Wed May 29 2019

PAC011-017-029-077-091-300048-
/O.EXP.KPHI.FF.W.0006.000000T0000Z-190530T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Montgomery PA-Lehigh PA-Bucks PA-Chester PA-
839 PM EDT Wed May 29 2019

...THE FLASH FLOOD WARNING FOR BERKS...NORTHWESTERN MONTGOMERY...
SOUTHEASTERN LEHIGH...NORTHWESTERN BUCKS AND NORTHERN CHESTER
COUNTIES WILL EXPIRE AT 845 PM EDT...

The heavy rain has ended. Please continue to heed any remaining road 
closures.

LAT...LON 4052 7634 4052 7625 4058 7605 4057 7602
      4061 7600 4056 7536 4054 7533 4055 7531
      4053 7509 4021 7565 4024 7604 4036 7621
      4037 7623 4049 7643

$$

Kruzdlo

The office that day

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

IssuedProductOfficeCountiesLasted
May 28, 8:23 PM EDTTornado WarningPHIMonroe37 min
May 28, 9:17 PM EDTRiver Flood WarningPHIChester101 min
May 29, 3:18 AM EDTFlash Flood WatchPHIBerks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more18 hr
May 29, 2:19 PM EDTSpecial Weather StatementPHILehigh41 min
May 29, 2:26 PM EDTSpecial Weather StatementPHIMontgomery34 min
May 29, 2:30 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Lehigh, Montgomery, Northampton60 min
May 29, 2:48 PM EDTSpecial Weather StatementPHIMonroe27 min
May 29, 2:59 PM EDTSevere Thunderstorm WarningPHICarbon, Monroe46 min
May 29, 3:10 PM EDTSevere Thunderstorm WarningPHIBucks, Lehigh, Northampton65 min
May 29, 3:17 PM EDTTornado WarningPHIBucks, Lehigh28 min
May 29, 3:29 PM EDTSevere Thunderstorm WarningPHICarbon, Monroe, Northampton46 min
May 29, 3:29 PM EDTSevere Thunderstorm WarningPHICarbon, Lehigh, Monroe, Northampton46 min
May 29, 3:38 PM EDTTornado WarningPHIBucks37 min
May 29, 3:43 PM EDTFlash Flood WarningPHICarbon, Monroe4 hr
May 29, 3:43 PM EDTSevere Thunderstorm WarningPHIBerks, Lehigh62 min
May 29, 3:43 PM EDTSevere Thunderstorm WarningPHIMonroe, Northampton47 min
May 29, 4:04 PM EDTSevere Thunderstorm WarningPHIBucks41 min
May 29, 4:09 PM EDTSevere Thunderstorm WarningPHIMonroe, Northampton51 min
May 29, 4:13 PM EDTSevere Thunderstorm WarningPHIBucks, Lehigh, Northampton47 min
May 29, 4:16 PM EDTSevere Thunderstorm WarningPHICarbon, Lehigh, Monroe, Northampton27 min
May 29, 4:18 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Chester, Lehigh, Montgomery, Northampton42 min
May 29, 4:27 PM EDTAreal Flood AdvisoryPHIBerks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more51 min
May 29, 4:35 PM EDTSpecial Weather StatementPHIBerks, Carbon, Lehigh, Monroe, Northampton25 min
May 29, 4:42 PM EDTSevere Thunderstorm WarningPHICarbon, Lehigh, Monroe, Northampton48 min
May 29, 4:50 PM EDTSevere Thunderstorm WarningPHIBerks, Carbon, Chester, Lehigh, Montgomery, Northampton40 min
May 29, 4:53 PM EDTSevere Thunderstorm WarningPHIBucks, Montgomery67 min
May 29, 5:08 PM EDTTornado WarningPHIBucks, Montgomery27 min
May 29, 5:14 PM EDTFlash Flood WarningPHIBerks, Bucks, Carbon, Lehigh, Monroe, Northampton3 hr
May 29, 5:23 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Chester, Lehigh, Monroe, Montgomery and 1 more34 min
May 29, 5:27 PM EDTFlash Flood WarningPHIBucks, Chester, Montgomery, Philadelphia4 hr
May 29, 5:33 PM EDTTornado WarningPHIBucks27 min
May 29, 5:39 PM EDTSevere Thunderstorm WarningPHIBucks66 min
May 29, 5:49 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Delaware, Montgomery, Philadelphia41 min
May 29, 6:06 PM EDTFlash Flood WarningPHIBucks4 hr
May 29, 6:06 PM EDTSevere Thunderstorm WarningPHIBucks, Montgomery, Philadelphia24 min
May 29, 6:22 PM EDTSevere Thunderstorm WarningPHIChester, Delaware, Montgomery, Philadelphia53 min
May 29, 6:35 PM EDTFlash Flood WarningPHIBerks, Chester, Delaware, Montgomery, Philadelphia3 hr
May 29, 7:12 PM EDTAreal Flood AdvisoryPHIChester3 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.