Alert archive / Pennsylvania / Flash Flood Warnings in 2013

Flash Flood Warning 21, NWS Philadelphia/Mount Holly

June 28, 2013Carbon County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 28, 2013, 6:21 PM EDT for Carbon 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: Jun 28, 2013, 6:21 PM EDT (22:21 UTC)
Expired: Jun 28, 2013, 10:15 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Carbon County, PA

The radar

The Binghamton radar (KBGM), 139 km from the middle of the area, began a volume at 22:22 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, 10.4 hours before the alert went out and 238 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: 591 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 570 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

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

215 
WGUS51 KPHI 282221
FFWPHI
PAC025-290215-
/O.NEW.KPHI.FF.W.0021.130628T2221Z-130629T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
621 PM EDT FRI JUN 28 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CARBON COUNTY...

* UNTIL 1015 PM EDT...

* AT 618 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER CARBON COUNTY. RAINFALL   
  RATES OF 2 INCHES PER HOUR ARE POSSIBLE FROM THIS STORM...WHICH    
  WILL FALL ON AREAS THAT RECEIVED HEAVY RAIN JUST YESTERDAY.        
  ROADWAY FLOODING AND FLOODING IN DITCHES AND SMALL FEEDER STREAMS  
  IS POSSIBLE WHEREVER THE HEAVIEST RAIN HAPPENS TO FALL.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. 
NEVER ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN 
DEPTH BY FOOT OR IN AN AUTOMOBILE. TURN AROUND DON'T DROWN!

&&

LAT...LON 4104 7555 4098 7552 4095 7557 4082 7548
      4078 7568 4073 7576 4084 7592 4092 7600
      4100 7575 4102 7574 4105 7578 4110 7576
      4114 7569 4114 7566

$$

FORECASTER:JJM

1 follow-up statement

943 
WGUS71 KPHI 290138
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
938 PM EDT FRI JUN 28 2013

PAC025-290148-
/O.CAN.KPHI.FF.W.0021.000000T0000Z-130629T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CARBON PA-
938 PM EDT FRI JUN 28 2013

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CARBON 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 4104 7555 4098 7552 4095 7557 4082 7548
      4078 7568 4073 7576 4084 7592 4092 7600
      4100 7575 4102 7574 4105 7578 4110 7576
      4114 7569 4114 7566

$$

FORECASTER:JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 8:50 PM EDT	Areal Flood Advisory	PHI	Carbon	3 hr
Jun 27, 10:00 PM EDT	Areal Flood Advisory	PHI	Bucks, Lehigh, Monroe, Northampton	3 hr
Jun 27, 10:04 PM EDT	River Flood Warning	PHI	Chester	6 hr
Jun 28, 3:19 PM EDT	Severe Thunderstorm Warning	PHI	Chester	41 min
Jun 28, 3:33 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware	117 min
Jun 28, 4:23 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	52 min
Jun 28, 5:49 PM EDT	Flash Flood Warning	PHI	Delaware	4 hr
Jun 28, 6:04 PM EDT	Special Weather Statement	PHI	Carbon	56 min
Jun 28, 6:43 PM EDT	Flash Flood Warning	PHI	Monroe	4 hr
Jun 28, 7:32 PM EDT	Areal Flood Advisory	PHI	Lehigh, Northampton	3 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2013 Every 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.