Alert archive / Pennsylvania / Flash Flood Warnings in 2019

Flash Flood Warning 51, NWS Philadelphia/Mount Holly

July 17, 2019Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 17, 2019, 7:06 PM EDT for Berks County, Pennsylvania. It was in force for 3 hr. 8 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: Jul 17, 2019, 7:06 PM EDT (23:06 UTC)
Expired: Jul 17, 2019, 10:00 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 125 km from the middle of the area, began a volume at 23:06 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

Time	Report	Where	Remark
Jul 17, 7:15 PM EDT	FLASH FLOOD	1 Nne West Lawn, PA	5 VEHICLES REPORTED STRANDED IN FLOOD WATERS ON STATE HILL RD WITH RESCUES NEEDED.
Jul 17, 7:17 PM EDT	FLASH FLOOD	1 Ne Mount Penn, PA	WATER RESCUE ON THE 700 BLOCK OF CARSONIA AVE.
Jul 17, 7:21 PM EDT	FLASH FLOOD	1 Sse Muhlenberg Twp, PA	PORTION OF ROUTE 12 NEAR THE N 5TH ST EXIT UNDER WATER.
Jul 17, 7:28 PM EDT	FLASH FLOOD	1 Sse Muhlenberg Twp, PA	WATER RESCUE REPORTED ON THE WARREN ST BYPASS NEAR THE N 5TH ST EXIT.
Jul 17, 7:31 PM EDT	FLASH FLOOD	1 Sw Mohnton, PA	CREEK OVERFLOWED ONTO THE ROAD NEAR THE INTERSECTION OF HAMPSHIRE AND VERMONT RD. SEVERAL INCHES OF FLOWING WATER OVER ROAD.
Jul 17, 7:40 PM EDT	HEAVY RAIN 2.5	Wyomissing, PA
Jul 17, 7:53 PM EDT	FLASH FLOOD	Douglassville, PA	WATER RESCUE ON E BEN FRANKLIN HWY AT OLD SWEDE RD.
Jul 17, 8:06 PM EDT	FLASH FLOOD	1 Ssw Exeter Twp, PA	SHELBOURNE RD FLOODED AFTER CREEK OVERFLOWED ONTO IT.

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, 11.1 hours before the alert went out and 214 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: 237 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 1666 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

572 
WGUS51 KPHI 172306
FFWPHI
PAC011-180200-
/O.NEW.KPHI.FF.W.0051.190717T2306Z-190718T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
706 PM EDT Wed Jul 17 2019

The National Weather Service in Mount Holly NJ has issued a

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

* Until 1000 PM EDT.

* At 704 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the central portion of Berks County.  According 
  to Doppler Radar, between one and two inches of rain has already 
  fallen in this area, and additional rain is moving in. 
  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

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 4062 7582 4053 7565 4045 7554 4044 7553
      4033 7562 4019 7578 4014 7587 4031 7614

$$

JJM

1 follow-up statement

541 
WGUS71 KPHI 180153
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
953 PM EDT Wed Jul 17 2019

PAC011-180202-
/O.EXP.KPHI.FF.W.0051.000000T0000Z-190718T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-
953 PM EDT Wed Jul 17 2019

...THE FLASH FLOOD WARNING FOR BERKS COUNTY WILL EXPIRE AT 1000 PM
EDT...

The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.

LAT...LON 4062 7582 4053 7565 4045 7554 4044 7553
      4033 7562 4019 7578 4014 7587 4031 7614

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 9:15 PM EDT	Special Weather Statement	PHI	Philadelphia	45 min
Jul 17, 3:54 AM EDT	Flash Flood Watch	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	19 hr
Jul 17, 1:26 PM EDT	Special Weather Statement	PHI	Pike	34 min
Jul 17, 1:50 PM EDT	Areal Flood Advisory	PHI	Carbon, Lehigh, Monroe, Northampton	80 min
Jul 17, 2:05 PM EDT	Special Weather Statement	PHI	Lehigh	25 min
Jul 17, 3:14 PM EDT	Excessive Heat Watch	PHI	Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more	24 hr
Jul 17, 5:05 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	40 min
Jul 17, 5:14 PM EDT	Special Weather Statement	PHI	Lehigh	46 min
Jul 17, 5:44 PM EDT	Special Weather Statement	PHI	Monroe	46 min
Jul 17, 5:46 PM EDT	Areal Flood Advisory	PHI	Monroe	119 min
Jul 17, 5:49 PM EDT	Special Weather Statement	PHI	Lehigh, Northampton	41 min
Jul 17, 6:24 PM EDT	Special Weather Statement	PHI	Berks	51 min
Jul 17, 6:35 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	40 min
Jul 17, 6:51 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	54 min
Jul 17, 6:52 PM EDT	Areal Flood Advisory	PHI	Berks	113 min
Jul 17, 7:15 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	45 min
Jul 17, 7:21 PM EDT	Flash Flood Warning	PHI	Chester	97 min
Jul 17, 7:31 PM EDT	Special Weather Statement	PHI	Lehigh, Northampton	44 min
Jul 17, 7:36 PM EDT	Flash Flood Warning	PHI	Bucks, Lehigh, Montgomery	3 hr
Jul 17, 7:44 PM EDT	Special Weather Statement	PHI	Lehigh	31 min
Jul 17, 7:56 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery, Philadelphia	64 min

Nearby

Flash Flood Warnings in Pennsylvania, 2019 Every 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.