Alert archive / Pennsylvania / Flash Flood Warnings in 2011

Flash Flood Warning 14, NWS Philadelphia/Mount Holly

July 25, 2011Warren County, New Jersey; Lehigh County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 25, 2011, 5:18 PM EDT for Warren County, New Jersey; Lehigh County, Northampton County, Pennsylvania. It was in force for 3 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: Jul 25, 2011, 5:18 PM EDT (21:18 UTC)
Expired: Jul 25, 2011, 8:34 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Warren County, NJ, Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 116 km from the middle of the area, began a volume at 21:21 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.3 hours before the alert went out and 151 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: 481 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 760 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 24 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.

122 
WGUS51 KPHI 252118
FFWPHI
NJC041-PAC077-095-260115-
/O.NEW.KPHI.FF.W.0014.110725T2118Z-110726T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
518 PM EDT MON JUL 25 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST CENTRAL LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  SOUTHERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF EASTON...
  SOUTHWESTERN WARREN COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 915 PM EDT

* AT 509 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR AND 
AUTOMATED SURFACE OBSERVATIONS INDICATED THAT THREE TO FOUR INCHES 
OF RAIN HAVE FALLEN ACROSS THE WARNED AREA THE LAST SEVERAL HOURS. 
AS A RESULT, WATER LEVELS ON THE MONOCACY CREEK IN BETHLEHEM WERE 
RISING QUICKLY. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO OLD
  ORCHARD...FORKS...HARMONY...WILSON...TATAMY...NORTHAMPTON...
  NAZARETH...GLENDON...BELFAST AND BATH

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 4070 7554 4083 7521 4071 7509 4056 7542

$$

KRUZDLO

2 follow-up statements

343 
WGUS71 KPHI 252300
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
700 PM EDT MON JUL 25 2011

NJC041-252309-
/O.CAN.KPHI.FF.W.0014.000000T0000Z-110726T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WARREN NJ-
700 PM EDT MON JUL 25 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHWESTERN WARREN
COUNTY...

LAT...LON 4078 7531 4066 7522 4056 7542 4070 7554

$$

PAC077-095-260115-
/O.CON.KPHI.FF.W.0014.000000T0000Z-110726T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LEHIGH PA-NORTHAMPTON PA-
700 PM EDT MON JUL 25 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM EDT FOR
CENTRAL NORTHAMPTON AND EAST CENTRAL LEHIGH COUNTIES...

AT 654 PM EDT...FLOODING CONTINUED IN THE ALLEN AND EAST ALLEN 
AREAS. ALSO, THE MONOCACY CREEK IN BETHLEHEM REMAINED ABOVE FLOOD 
STAGE.

LAT...LON 4078 7531 4066 7522 4056 7542 4070 7554

$$

KRUZDLO

489 
WGUS71 KPHI 260034
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
834 PM EDT MON JUL 25 2011

PAC077-095-260043-
/O.CAN.KPHI.FF.W.0014.000000T0000Z-110726T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LEHIGH PA-NORTHAMPTON PA-
834 PM EDT MON JUL 25 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL NORTHAMPTON
AND EAST CENTRAL LEHIGH COUNTIES...

THE RAIN HAS MOVED OUT OF THE AREA AND MOST STREAMS AND CREEKS HAVE 
RETURNED TO THEIR BANKS. AS A RESULT, THE FLASH FLOOD WARNING HAS 
BEEN CANCELLED.

LAT...LON 4078 7531 4066 7522 4056 7542 4070 7554

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 7:47 AM EDT	Special Weather Statement	PHI	Sussex	58 min
Jul 25, 9:17 AM EDT	Special Weather Statement	PHI	Sussex	58 min
Jul 25, 10:19 AM EDT	Special Weather Statement	PHI	Sussex	56 min
Jul 25, 4:31 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Warren	3 hr
Jul 24, 10:53 PM EDT	Special Weather Statement	PHI	Schuylkill	67 min
Jul 25, 6:19 AM EDT	Special Weather Statement	PHI	Monroe	56 min
Jul 25, 10:30 AM EDT	Special Weather Statement	PHI	Monroe	90 min
Jul 25, 11:51 AM EDT	Special Weather Statement	PHI	Berks	54 min
Jul 25, 11:58 AM EDT	Special Weather Statement	PHI	Carbon, Monroe	62 min
Jul 25, 12:19 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	56 min
Jul 25, 12:45 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	60 min
Jul 25, 12:59 PM EDT	Areal Flood Advisory	PHI	Carbon	2 hr
Jul 25, 1:34 PM EDT	Special Weather Statement	PHI	Berks	56 min
Jul 25, 3:01 PM EDT	Special Weather Statement	PHI	Northampton	59 min
Jul 25, 4:25 PM EDT	Flash Flood Warning	PHI	Northampton	3 hr
Jul 25, 5:18 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	57 min
Jul 25, 5:49 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	93 min
Jul 25, 5:57 PM EDT	Special Weather Statement	PHI	Berks	63 min
Jul 25, 6:23 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	3 hr
Jul 25, 7:13 PM EDT	Special Weather Statement	PHI	Delaware	62 min

Nearby

Flash Flood Warnings in Pennsylvania, 2011 Flash Flood Warnings in New Jersey, 2011 Every flash flood warning in 2011

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.