Alert archive / Pennsylvania / Flash Flood Warnings in 2013

Flash Flood Warning 51, NWS Philadelphia/Mount Holly

August 9, 2013Monroe County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 9, 2013, 8:39 AM EDT for Monroe County, Pennsylvania. It was in force for 4 hr. 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 9, 2013, 8:39 AM EDT (12:39 UTC)
Expired
Aug 9, 2013, 12:30 PM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

County Monroe County, PA

The radar

The Philadelphia radar (KDIX), 140 km from the middle of the area, began a volume at 12:42 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

Brookhaven, NY (KOKX), launched 12:00Z, 0.7 hours before the alert went out and 200 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, Brookhaven, NY at 12:00Z on 2013-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 673 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, Brookhaven, NY at 12:00Z on 2013-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 134 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
673 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
549 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
134 m²/s²
0-3 km storm-relative helicity
165 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

367 
WGUS51 KPHI 091239
FFWPHI
PAC089-091630-
/O.NEW.KPHI.FF.W.0051.130809T1239Z-130809T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
839 AM EDT FRI AUG 9 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MONROE COUNTY...

* UNTIL 1230 PM EDT...

* AT 832 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER MONROE COUNTY NEAR 
  HERNYVILLE AND PARADISE VALLEY. THESE AREAS ALREADY HAVE RECEIVED 
  BETWEEN TWO AND FOUR INCHES OF RAIN OVERNIGHT. ADDITIONAL 
  THUNDERSTORMS WITH HEAVY RAIN OVER SCHUYLKILL COUNTY WILL MOVE
  OVER MONROE COUNTY LATER THIS MORNING.
 
ADDITIONAL RAINFALL AMOUNTS OF AROUND ONE INCH AND LOCALLY UP TO 
THREE INCHES ARE POSSIBLE.  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. NEVER ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR IN AN
AUTOMOBILE. TURN AROUND DON'T DROWN!

FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...
DIPS...OR LOW WATER CROSSINGS. TURN AROUND...DON'T DROWN! NEVER TRY
TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE
RISING WATER MOVE UP TO HIGHER GROUND.

&&

LAT...LON 4116 7515 4114 7508 4109 7503 4109 7496
      4104 7503 4099 7513 4097 7512 4095 7515
      4093 7521 4087 7528 4084 7536 4094 7555
      4096 7555 4099 7550 4107 7558 4125 7529
      4126 7513

$$

TFG
1 follow-up statement
324 
WGUS71 KPHI 091532
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1132 AM EDT FRI AUG 9 2013

PAC089-091541-
/O.CAN.KPHI.FF.W.0051.000000T0000Z-130809T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MONROE PA-
1132 AM EDT FRI AUG 9 2013

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR MONROE COUNTY...

THE WATERS FROM THE EARLIER HEAVY RAINS ARE RECEDING AND FLOOD WATERS
NO LONGER POSE A THREAT TO LIFE OR PROPERTY. THEREFORE...THE FLASH
FLOOD WARNING HAS BEEN CANCELLED.

LAT...LON 4116 7515 4114 7508 4109 7503 4109 7496
      4104 7503 4099 7513 4097 7512 4095 7515
      4093 7521 4087 7528 4084 7536 4094 7555
      4096 7555 4099 7550 4107 7558 4125 7529
      4126 7513

$$

KLINE

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 6:30 AM EDTAreal Flood AdvisoryPHIMonroe4 hr
Aug 9, 8:03 AM EDTFlash Flood WatchPHICarbon, Lehigh, Monroe, Northampton11 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2013Every flash flood warning in 2013

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.