Alert archive / Pennsylvania / Flash Flood Warnings in 2012

Flash Flood Warning 17, NWS Philadelphia/Mount Holly

July 18, 2012Monroe County, Northampton County, Pennsylvania; Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 18, 2012, 3:52 PM EDT for Monroe County, Northampton County, Pennsylvania; Warren County, New Jersey. It was in force for 113 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
Jul 18, 2012, 3:52 PM EDT (19:52 UTC)
Expired
Jul 18, 2012, 5:45 PM EDT
In force
113 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Warren County, NJ, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 116 km from the middle of the area, began a volume at 19:52 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, 7.9 hours before the alert went out and 181 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 2012-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2129 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 2012-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 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
2129 J/kg
Mixed-layer CIN
-147 J/kg
Mixed-layer LCL
1491 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
95 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

468 
WGUS51 KPHI 181952
FFWPHI
NJC041-PAC089-095-182245-
/O.NEW.KPHI.FF.W.0017.120718T1952Z-120718T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
352 PM EDT WED JUL 18 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL WARREN COUNTY...
  SOUTHEASTERN MONROE COUNTY...
  NORTHEASTERN NORTHAMPTON COUNTY...

* UNTIL 645 PM EDT...

* AT 344 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN FROM MULTIPLE THUNDERSTORMS TRACKING ACROSS THE    
  AREA. DOPPLER RADAR ESTIMATES INDICATE 2.0 TO 2.5 INCHES OF RAIN   
  HAS FALLEN WITHIN AN HOUR WITH ADDITIONAL RAINFALL EXPECTED.

* THIS AMOUNT OF RAIN IN A SHORT PERIOD OF TIME WILL LEAD TO         
  FLOODING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE ACROSS FLOODED ROADWAYS.

PLEASE REPORT FLOODING...HAIL OR WIND DAMAGE TO THE NATIONAL WEATHER
SERVICE BY CALLING TOLL FREE...1-877-633-6772.

&&

LAT...LON 4098 7485 4079 7488 4078 7490 4075 7533
      4102 7532

$$

FORECASTER: GORSE
1 follow-up statement
995 
WGUS71 KPHI 182145
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
545 PM EDT WED JUL 18 2012

NJC041-PAC089-095-182155-
/O.CAN.KPHI.FF.W.0017.000000T0000Z-120718T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WARREN NJ-MONROE PA-NORTHAMPTON PA-
545 PM EDT WED JUL 18 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHEASTERN
NORTHAMPTON...SOUTH CENTRAL MONROE AND CENTRAL WARREN COUNTIES...

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.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO RURAL AREAS
OF CENTRAL WARREN...NORTHEASTERN NORTHAMPTON AND SOUTH CENTRAL MONROE
COUNTIES.

LAT...LON 4098 7485 4079 7488 4078 7490 4075 7533
      4102 7532

$$

KRUZDLO

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 1:27 PM EDTSpecial Weather StatementPHIMonroe33 min
Jul 18, 1:53 PM EDTSpecial Weather StatementPHIBucks37 min
Jul 18, 2:07 PM EDTSpecial Weather StatementPHIBerks38 min
Jul 18, 2:12 PM EDTSevere Thunderstorm WarningPHIBerks48 min
Jul 18, 2:15 PM EDTSpecial Weather StatementPHIMonroe60 min
Jul 18, 2:23 PM EDTSpecial Weather StatementPHINorthampton67 min
Jul 18, 2:43 PM EDTSpecial Weather StatementPHIBerks, Lehigh47 min
Jul 18, 3:04 PM EDTSpecial Weather StatementPHIBerks, Lehigh, Northampton41 min
Jul 18, 3:13 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Lehigh, Northampton47 min
Jul 18, 3:26 PM EDTSevere Thunderstorm WarningPHINorthampton49 min
Jul 18, 3:36 PM EDTSpecial Weather StatementPHIBerks54 min
Jul 18, 3:43 PM EDTSpecial Weather StatementPHICarbon47 min
Jul 18, 3:51 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Montgomery28 min
Jul 18, 4:22 PM EDTSpecial Weather StatementPHIBucks23 min
Jul 18, 4:28 PM EDTSevere Thunderstorm WarningPHIBucks32 min
Jul 18, 5:30 PM EDTSpecial Weather StatementPHIBucks60 min
Jul 18, 5:51 PM EDTSpecial Weather StatementPHIPhiladelphia54 min
Jul 18, 12:51 PM EDTSpecial Weather StatementPHISussex54 min
Jul 18, 1:02 PM EDTSevere Thunderstorm WarningPHISussex34 min
Jul 18, 1:11 PM EDTSpecial Weather StatementPHISussex34 min
Jul 18, 1:23 PM EDTSpecial Weather StatementPHIMorris37 min
Jul 18, 1:43 PM EDTAreal Flood AdvisoryPHISussex2 hr
Jul 18, 1:49 PM EDTSevere Thunderstorm WarningPHISussex26 min
Jul 18, 2:46 PM EDTSevere Thunderstorm WarningPHIMiddlesex29 min
Jul 18, 3:00 PM EDTSpecial Weather StatementPHIMonmouth45 min
Jul 18, 3:18 PM EDTSpecial Marine WarningPHI42 min
Jul 18, 3:25 PM EDTSevere Thunderstorm WarningPHIMorris, Sussex65 min
Jul 18, 3:29 PM EDTSpecial Weather StatementPHIMonmouth46 min
Jul 18, 3:59 PM EDTFlash Flood WarningPHIMorris, Sussex107 min
Jul 18, 4:03 PM EDTSpecial Weather StatementPHIHunterdon42 min
Jul 18, 4:17 PM EDTSpecial Weather StatementPHIMorris43 min
Jul 18, 4:30 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Morris, Somerset45 min
Jul 18, 4:41 PM EDTSpecial Weather StatementPHIMercer34 min
Jul 18, 4:53 PM EDTSpecial Weather StatementPHIMercer22 min
Jul 18, 5:01 PM EDTSpecial Weather StatementPHIMiddlesex29 min
Jul 18, 5:07 PM EDTSpecial Marine WarningPHI38 min
Jul 18, 5:11 PM EDTSpecial Weather StatementPHIMiddlesex, Somerset64 min
Jul 18, 5:12 PM EDTAreal Flood AdvisoryPHIHunterdon, Middlesex, Somerset81 min
Jul 18, 5:19 PM EDTSevere Thunderstorm WarningPHIMonmouth41 min
Jul 18, 5:26 PM EDTSpecial Marine WarningPHI34 min
Jul 18, 5:33 PM EDTSpecial Weather StatementPHIMercer57 min
Jul 18, 5:44 PM EDTSpecial Marine WarningPHI31 min
Jul 18, 6:00 PM EDTSpecial Marine WarningPHI60 min
Jul 18, 6:09 PM EDTAreal Flood AdvisoryPHIBurlington, Monmouth, Ocean68 min
Jul 18, 6:32 PM EDTSpecial Weather StatementPHIOcean43 min
Jul 18, 6:45 PM EDTSpecial Weather StatementPHICape May, Cumberland60 min
Jul 18, 6:51 PM EDTSpecial Marine WarningPHI39 min
Jul 18, 6:51 PM EDTSpecial Marine WarningPHI39 min
Jul 18, 7:17 PM EDTSpecial Weather StatementPHICape May58 min

Nearby

Flash Flood Warnings in Pennsylvania, 2012Flash Flood Warnings in New Jersey, 2012Every flash flood warning in 2012

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.