Alert archive / Pennsylvania / Areal Flood Warnings in 2011

Areal Flood Warning 2, NWS Philadelphia/Mount Holly

March 6, 2011Carbon County, Lehigh County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood warning at Mar 6, 2011, 4:55 PM EST for Carbon County, Lehigh County, Northampton County, Pennsylvania. It was in force for 12 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
Mar 6, 2011, 4:55 PM EST (21:55 UTC)
Expired
Mar 7, 2011, 4:45 AM EST
In force
12 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Carbon County, PA, Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 147 km from the middle of the area, began a volume at 21:56 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, 9.9 hours before the alert went out and 235 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 2011-03-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 10 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2011-03-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 351 square meters per square second.19395878Sfc1 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
10 J/kg
Mixed-layer CIN
-36 J/kg
Mixed-layer LCL
597 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
351 m²/s²
0-3 km storm-relative helicity
326 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.

989 
WGUS41 KPHI 062155
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
455 PM EST SUN MAR 6 2011

PAC025-077-095-070345-
/O.NEW.KPHI.FA.W.0002.110306T2155Z-110307T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LEHIGH PA-NORTHAMPTON PA-CARBON PA-
455 PM EST SUN MAR 6 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLOOD WARNING FOR URBAN AREAS AND SMALL STREAMS IN...
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  CARBON COUNTY IN NORTHEAST PENNSYLVANIA...

* UNTIL 1045 PM EST

* AT 452 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
AN AREA OF HEAVY RAIN APPROACHING THE LEHIGH VALLEY AND SOUTHERN 
POCONOS. AS MUCH AS ONE AND THREE-QUARTERS OF AN INCH OF RAIN HAS 
FALLEN SO FAR...AND ANOTHER INCH IS POSSIBLE THIS EVENING. 

ADDITIONAL RAINFALL THIS EVENING WILL RESULT IN STREAMS AND CREEKS 
RISES OUT OF THEIR BANKS. IN ADDITION...ROAD FLOODING AND FLOODING 
OF POOR DRAINAGE AREAS CAN BE EXPECTED.

A FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR HAS BEEN REPORTED.
STREAM RISES WILL BE SLOW AND FLASH FLOODING IS NOT EXPECTED.
HOWEVER...ALL INTERESTED PARTIES SHOULD TAKE NECESSARY PRECAUTIONS
IMMEDIATELY.

LAT...LON 4112 7566 4100 7553 4097 7552 4094 7557
      4081 7549 4092 7514 4059 7526 4043 7549
      4067 7587 4069 7588 4074 7578 4084 7593
      4091 7596 4098 7586 4100 7575 4104 7577

$$

HAYES
2 follow-up statements
376 
WGUS41 KPHI 070341
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1041 PM EST SUN MAR 6 2011

PAC025-077-095-070945-
/O.EXT.KPHI.FA.W.0002.000000T0000Z-110307T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LEHIGH PA-NORTHAMPTON PA-CARBON PA-
1041 PM EST SUN MAR 6 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE

* FLOOD WARNING FOR URBAN AREAS AND SMALL STREAMS IN...
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  CARBON COUNTY IN NORTHEAST PENNSYLVANIA...

* UNTIL 445 AM EST MONDAY

* AT 1038 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED 
RAIN MOVING ACROSS THE WARNED AREA. SMALL RIVERS...CREEKS AND 
STREAMS CONTINUE TO RISE THIS EVENING...AND AS THE RUNOFF FROM THE 
EARLIER HEAVY RAIN GETS INTO THE RIVERS AND STREAMS...MORE IN THE 
WAY OF FLOODING IS EXPECTED.  

A FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR HAS BEEN REPORTED.
STREAM RISES WILL BE SLOW AND FLASH FLOODING IS NOT EXPECTED.
HOWEVER...ALL INTERESTED PARTIES SHOULD TAKE NECESSARY PRECAUTIONS
IMMEDIATELY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF 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.

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.

&&

LAT...LON 4112 7566 4100 7553 4097 7552 4094 7557
      4081 7549 4092 7514 4059 7526 4043 7549
      4067 7587 4069 7588 4074 7578 4084 7593
      4091 7596 4098 7586 4100 7575 4104 7577

$$

HAYES
460 
WGUS81 KPHI 070937
FLSPHI

FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
437 AM EST MON MAR 7 2011

PAC025-077-095-070948-
/O.EXP.KPHI.FA.W.0002.000000T0000Z-110307T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LEHIGH PA-NORTHAMPTON PA-CARBON PA-
437 AM EST MON MAR 7 2011

...THE FLOOD WARNING WILL EXPIRE AT 445 AM EST FOR URBAN AREAS AND
SMALL STREAMS IN CARBON...NORTHAMPTON AND LEHIGH COUNTIES...

LAT...LON 4112 7566 4100 7553 4097 7552 4094 7557
      4081 7549 4092 7514 4059 7526 4043 7549
      4067 7587 4069 7588 4074 7578 4084 7593
      4091 7596 4098 7586 4100 7575 4104 7577

$$

KRUZDLO

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 6, 3:30 AM ESTCoastal Flood StatementPHIDelaware, Philadelphia17 hr
Mar 6, 3:37 AM ESTWinter Weather AdvisoryPHIBerks, Carbon, Lehigh, Monroe, Northampton28 hr
Mar 6, 2:19 PM ESTAreal Flood AdvisoryPHIBerks, Carbon, Lehigh, Monroe, Northampton6 hr
Mar 6, 3:14 PM ESTSpecial Weather StatementPHIChester, Delaware, Montgomery61 min
Mar 6, 3:32 PM ESTAreal Flood WarningPHIBerks, Monroe41 days
Mar 6, 5:33 PM ESTAreal Flood AdvisoryPHIBucks, Chester, Delaware, Montgomery, Philadelphia4 hr

Nearby

Areal Flood Warnings in Pennsylvania, 2011Every areal 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.