Alert archive / Pennsylvania / Flash Flood Warnings in 2012

Flash Flood Warning 10, NWS Philadelphia/Mount Holly

June 1, 2012Berks County, Lehigh County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 1, 2012, 11:04 PM EDT for Berks County, Lehigh County, Montgomery 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 1, 2012, 11:04 PM EDT (03:04 UTC)
Expired
Jun 2, 2012, 3:00 AM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Berks County, PA, Lehigh County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 118 km from the middle of the area, began a volume at 03:06 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, 3.1 hours before the alert went out and 231 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 00:00Z on 2012-06-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2012-06-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 191 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
893 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
191 m²/s²
0-3 km storm-relative helicity
240 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.

655 
WGUS51 KPHI 020304
FFWPHI
PAC011-077-091-020700-
/O.NEW.KPHI.FF.W.0010.120602T0304Z-120602T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1104 PM EDT FRI JUN 1 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST CENTRAL BERKS COUNTY...
  SOUTHERN LEHIGH COUNTY...
  NORTHWESTERN MONTGOMERY COUNTY...

* UNTIL 300 AM EDT...

* AT 1057 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER EAST CENTRAL BERKS...
  NORTHWESTERN MONTGOMERY AND SOUTHERN LEHIGH COUNTIES.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ALLENTOWN.

ADDITIONAL RAINFALL AMOUNTS OF ONE INCH ARE POSSIBLE IN THE WARNED 
AREA AS THE NEXT BAND OF HEAVY RAIN MOVES IN FROM THE WEST. THE 
WARNED AREA HAS RECEIVED SEVERAL INCHES OF RAINFALL THIS PAST WEEK 
ONLY ADDING TO THE THREAT OF FLASH FLOODING TONIGHT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4066 7573 4063 7539 4062 7538 4045 7547
      4035 7549 4037 7577

$$

HEAVENER
1 follow-up statement
692 
WGUS71 KPHI 020558
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
158 AM EDT SAT JUN 2 2012

PAC011-077-091-020700-
/O.CON.KPHI.FF.W.0010.000000T0000Z-120602T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BERKS PA-LEHIGH PA-MONTGOMERY PA-
158 AM EDT SAT JUN 2 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 300 AM EDT FOR
NORTHWESTERN MONTGOMERY...SOUTHERN LEHIGH AND EAST CENTRAL BERKS
COUNTIES...

AT 150 AM EDT...DOPPLER RADAR INDICATED THAT THE HEAVY RAIN HAD 
MOVED TO THE NORTHEAST AND EAST OF BERKS COUNTY...MONTGOMERY COUNTY 
AND LEHIGH COUNTY. HOWEVER...SOME STREAMS AND CREEKS CONTINUED TO 
RISE AS A RESULT OF THE RECENT HEAVY RAINFALL. SOME LOCATIONS 
RECEIVED AN INCH OR TWO OF RAIN IN A BRIEF PERIOD OF TIME. THERE 
WERE LOCALLY HIGHER AMOUNTS.

THE FLASH FLOOD WARNING WILL REMAIN IN EFFECT UNTIL 300 AM. BY THAT 
TIME...STREAM AND CREEK LEVELS SHOULD BEGIN TO SUBSIDE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE THROUGH FLOOD WATERS. THE WATER MAY BE DEEPER THAN YOU 
THINK IT IS.

PLEASE REPORT FLOODING...HAIL OR WIND DAMAGE BY CALLING YOUR LOCAL
LAW ENFORCEMENT OFFICIALS OR BY CALLING THE NATIONAL WEATHER SERVICE
TOLL FREE AT...1-877-633-6772.

&&

LAT...LON 4066 7573 4063 7539 4062 7538 4045 7547
      4035 7549 4037 7577

$$

IOVINO

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 1, 8:46 PM EDTAreal Flood AdvisoryPHIChester, Delaware, Montgomery, Philadelphia5 hr
Jun 1, 8:58 PM EDTSpecial Weather StatementPHIBerks, Bucks, Lehigh, Montgomery, Northampton62 min
Jun 1, 9:03 PM EDTTornado WarningPHIBucks, Montgomery27 min
Jun 1, 10:01 PM EDTSpecial Weather StatementPHIBerks89 min
Jun 2, 12:26 AM EDTAreal Flood AdvisoryPHIBerks, Montgomery85 min
Jun 2, 1:12 AM EDTAreal Flood AdvisoryPHIMonroe3 hr
Jun 2, 2:45 AM EDTAreal Flood WarningPHIMontgomery6 hr
Jun 2, 11:28 AM EDTCoastal Flood AdvisoryPHIDelaware, Philadelphia15 hr

Nearby

Flash Flood Warnings in Pennsylvania, 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.