Alert archive / Pennsylvania / Flash Flood Warnings in 2013

Flash Flood Warning 22, NWS Philadelphia/Mount Holly

June 28, 2013Monroe County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 28, 2013, 6:43 PM 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: Jun 28, 2013, 6:43 PM EDT (22:43 UTC)
Expired: Jun 28, 2013, 10:45 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 Binghamton radar (KBGM), 141 km from the middle of the area, began a volume at 22:45 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, 10.7 hours before the alert went out and 202 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.

598 
WGUS51 KPHI 282243
FFWPHI
PAC089-290245-
/O.NEW.KPHI.FF.W.0022.130628T2243Z-130629T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 1045 PM EDT...

* AT 637 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN FROM THUNDERSTORMS MOVING IN FROM CARBON COUNTY.   
  RAINFALL RATES UP TO 2 INCHES PER HOUR ARE POSSIBLE...AND THIS     
  WILL PRODUCE FLOODING OF ROADWAYS...LOW LYING AREAS...AND DITCHES  
  AND SMALL FEEDER STREAMS...WHEREVER THE HEAVIEST RAIN HAPPENS TO   
  FALL. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

&&

LAT...LON 4116 7515 4114 7508 4109 7503 4109 7496
      4104 7503 4099 7513 4097 7512 4095 7515
      4093 7521 4086 7529 4081 7547 4095 7557
      4099 7550 4113 7565 4121 7557 4124 7551
      4126 7513

$$

FORECASTER: JJM

1 follow-up statement

777 
WGUS71 KPHI 290137
FFSPHI

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

PAC089-290147-
/O.CAN.KPHI.FF.W.0022.000000T0000Z-130629T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MONROE PA-
937 PM EDT FRI JUN 28 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 4086 7529 4081 7547 4095 7557
      4099 7550 4113 7565 4121 7557 4124 7551
      4126 7513

$$

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, 6:21 PM EDT	Flash Flood Warning	PHI	Carbon	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.