Alert archive / Pennsylvania / Areal Flood Warnings in 2016

Areal Flood Warning 2, NWS Philadelphia/Mount Holly

February 3, 2016Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood warning at Feb 3, 2016, 7:04 PM EST for Chester County, Pennsylvania. It was in force for 7 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
Feb 3, 2016, 7:04 PM EST (00:04 UTC)
Expired
Feb 4, 2016, 1:43 AM EST
In force
7 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

County Chester County, PA

The radar

The Philadelphia radar (KDIX), 128 km from the middle of the area, began a volume at 00:03 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.1 hours before the alert went out and 177 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, Washington/Dulle, VA at 00:00Z on 2016-02-04Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2016-02-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 423 square meters per square second.1939587897Sfc1 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
683 m above ground
0-6 km bulk shear
82 kt
0-1 km storm-relative helicity
423 m²/s²
0-3 km storm-relative helicity
432 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

845 
WGUS41 KPHI 040004
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
704 PM EST WED FEB 3 2016

PAC029-040400-
/O.NEW.KPHI.FA.W.0002.160204T0004Z-160204T0400Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHESTER PA-
704 PM EST WED FEB 3 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLOOD WARNING FOR...
  RAIN AND SNOWMELT IN...
  NORTHWESTERN CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL 1100 PM EST

* AT 659 PM EST...THE WEST BRANCH OF THE BRANDYWINE CREEK AT
  HONEYBROOK ROSE ABOVE ITS FLOOD STAGE OF 7 FEET. 

* ROADS ARE SUBJECT TO FLOODING AND CLOSURE IN THE VICINITY OF
  THE CREEK. 

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.

&&

LAT...LON 3999 7597 4004 7593 4011 7594 4014 7587
      4016 7584 4003 7575 3992 7598

$$

KRUZDLO
2 follow-up statements
735 
WGUS41 KPHI 040338
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1038 PM EST WED FEB 3 2016

PAC029-040800-
/O.EXT.KPHI.FA.W.0002.000000T0000Z-160204T0800Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHESTER PA-
1038 PM EST WED FEB 3 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS EXTENDED THE

* FLOOD WARNING FOR...
  RAIN AND SNOWMELT IN...
  NORTHWESTERN CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL 300 AM EST

* AT 1035 PM EST...THE WEST BRANCH OF THE BRANDYWINE AT HONEYBROOK
  HAD CRESTED, BUT WAS STILL ABOVE FLOOD STAGE. THE CREEK WILL DROP
  BELOW FLOOD STAGE OVERNIGHT. 

* ROADS ARE SUBJECT TO CLOSURE IN THE VICINITY OF THE RIVER.

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.

&&

LAT...LON 3999 7597 4004 7593 4011 7594 4014 7587
      4016 7584 4003 7575 3992 7598

$$

KRUZDLO
196 
WGUS81 KPHI 040643
FLSPHI

FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
143 AM EST THU FEB 4 2016

PAC029-040652-
/O.CAN.KPHI.FA.W.0002.000000T0000Z-160204T0800Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHESTER PA-
143 AM EST THU FEB 4 2016

...THE FLOOD WARNING FOR RAIN AND SNOWMELT HAS BEEN CANCELLED FOR
NORTHWESTERN CHESTER COUNTY...

FLOOD WATERS HAVE RECEDED...AND ARE NO LONGER EXPECTED TO POSE A
THREAT TO LIFE OR PROPERTY. PLEASE CONTINUE TO HEED ANY ROAD
CLOSURES.

LAT...LON 3999 7597 4004 7593 4011 7594 4014 7587
      4016 7584 4003 7575 3992 7598

$$

KRUZDLO

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 3, 9:41 PM ESTDense Fog AdvisoryPHIBerks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more9 hr
Feb 4, 3:27 PM ESTWinter Weather AdvisoryPHIBucks, Chester, Delaware, Montgomery, Philadelphia21 hr

Nearby

Areal Flood Warnings in Pennsylvania, 2016Every areal flood warning in 2016

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.