Alert archive / Pennsylvania / Flash Flood Warnings in 2016

Flash Flood Warning 7, NWS Philadelphia/Mount Holly

May 30, 2016Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at May 30, 2016, 4:33 AM EDT for Philadelphia County, Pennsylvania. It was in force for 117 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 30, 2016, 4:33 AM EDT (08:33 UTC)
Expired: May 30, 2016, 6:30 AM EDT
In force: 117 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 54 km from the middle of the area, began a volume at 08:35 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 00:00Z, 8.6 hours before the alert went out and 204 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: 4 J/kg
Mixed-layer CIN: -200 J/kg
Mixed-layer LCL: 666 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 60 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

487 
WGUS51 KPHI 300833
FFWPHI
PAC101-301030-
/O.NEW.KPHI.FF.W.0007.160530T0833Z-160530T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
433 AM EDT MON MAY 30 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL 630 AM EDT
    
* AT 429 AM EDT...DOPPLER RADAR INDICATED SHOWERS AND THUNDERSTORMS
  HAVE PRODUCED 1 TO 2 INCHES OF RAIN WITHIN THE PAST TWO HOURS
  ACROSS THE WARNED AREA. FLASH FLOODING IS OCCURRING NOW
  ALONG THE PENNYPACK CREEK.

* ANOTHER BATCH OF LESSER INTENSE RAIN WILL OCCUR BY 515 AM AND THEN
  THE PENNYPACK AND ALL FLOOD WATERS SHOULD QUICKLY RECEDE. 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  PHILADELPHIA...TACONY...HOLMESBURG...NORTHEAST PHILADELPHIA AND
  WISSINOMING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4008 7496 4001 7507 4004 7506 4003 7512
      4010 7503

$$

DRAG

1 follow-up statement

536 
WGUS71 KPHI 300854
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
454 AM EDT MON MAY 30 2016

PAC101-301030-
/O.CON.KPHI.FF.W.0007.000000T0000Z-160530T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PHILADELPHIA PA-
454 AM EDT MON MAY 30 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 AM EDT FOR
NORTHEASTERN PHILADELPHIA COUNTY...

AT 447 AM EDT...DOPPLER RADAR INDICATED THE HEAVIEST RAIN HAS
ALREADY OCCURRED IN PHILADELPHIA. THE PENNYPACK CREEK, LIKE THE
FRANKFORD CREEK HAD SWIFTLY RECEDED WITHIN ITS BANKS.

THERE MAY BE ANOTHER ONE QUARTER INCH OF RAIN BEFORE IT ALL ENDS
AROUND 530 AM. 

SOME RESIDUAL RECEDING FLOODING IS POSSIBLE NEAR THE PENNYPACK CREEK
AND ELSEWHERE IN NORTHEAST PHILADELPHIA COUNTY AND SO THE WARNING
CONTINUES THROUGH ITS EXPIRATION.  

SOME LOCATIONS THAT MAY EXPERIENCE FURTHER FLOODING INCLUDE...
TACONY...HOLMESBURG...CENTRAL AND NORTHEAST PHILADELPHIA AND
WISSINOMING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT ENTER OR CROSS FLOWING WATER OR WATER OF UNKNOWN DEPTH. 

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4008 7496 4001 7507 4004 7506 4003 7512
      4010 7503

$$

DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
May 29, 10:39 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware, Montgomery, Philadelphia	6 hr
May 29, 11:27 PM EDT	Areal Flood Advisory	PHI	Bucks	8 hr
May 30, 1:56 AM EDT	Areal Flood Advisory	PHI	Carbon, Lehigh, Monroe, Northampton	4 hr
May 30, 4:17 AM EDT	Flash Flood Warning	PHI	Philadelphia	118 min
May 30, 5:52 PM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	83 min

Nearby

Flash Flood Warnings in Pennsylvania, 2016 Every flash flood warning in 2016

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.