Alert archive / Pennsylvania / Areal Flood Warnings in 2016

Areal Flood Warning 5, NWS Philadelphia/Mount Holly

February 16, 20164 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood warning at Feb 16, 2016, 7:12 PM EST for 4 counties in Pennsylvania. It was in force for 6 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 16, 2016, 7:12 PM EST (00:12 UTC)
Expired
Feb 17, 2016, 1:00 AM EST
In force
6 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Berks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 105 km from the middle of the area, began a volume at 00:15 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, 0.2 hours before the alert went out and 202 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 2016-02-17Temperature 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, Washington/Dulle, VA at 00:00Z on 2016-02-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -199 square meters per square second.1939587897117Sfc1 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
1052 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
-199 m²/s²
0-3 km storm-relative helicity
61 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

007 
WGUS41 KPHI 170012
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
712 PM EST TUE FEB 16 2016

PAC011-029-045-091-170600-
/O.NEW.KPHI.FA.W.0005.160217T0012Z-160217T0600Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHESTER PA-BERKS PA-DELAWARE PA-MONTGOMERY PA-
712 PM EST TUE FEB 16 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLOOD WARNING FOR...
  RAIN AND SNOWMELT IN...
  CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  SOUTHEASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
  CENTRAL DELAWARE COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  NORTHWESTERN MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL 100 AM EST

* AT 705 PM EST...MANY SMALL STREAMS IN THE AREA HAVE CRESTED AND
  ARE FALLING AT THIS TIME. HOWEVER...SOME LARGER TRIBUTARIES...SUCH
  AS THE PERKIOMEN CREEK BELOW GRATERFORD...AND THE BRANDYWINE CREEK
  BELOW DOWINGTOWN...WILL RISE ANOTHER FEW INCHES BEFORE CRESTING
  LATER THIS EVENING. THE FLOOD WARNING HAS THEREFORE BEEN EXTENDED
  INTO THE OVERNIGHT HOURS TO ALLOW TIME FOR THESE LARGER
  TRIBUTARIES TO DRAIN.  

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  WEST CHESTER...POTTSTOWN...PHOENIXVILLE...LANSDALE...WEST
  NORRITON...EAST NORRITON...COATESVILLE...WESTTOWN...DOWNINGTOWN...
  KENNETT SQUARE...BIRDSBORO...COLLEGEVILLE...ROYERSFORD...TRAPPE...
  HATFIELD...EAST GREENVILLE...HONEY BROOK...SCHWENKSVILLE...ELVERSON
  AND BALLY.

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.

&&

LAT...LON 4048 7564 4025 7525 4009 7544 3998 7531
      3986 7551 3982 7572 4010 7592 4013 7585
      4023 7592

$$

JJM
1 follow-up statement
337 
WGUS81 KPHI 170307
FLSPHI

FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1007 PM EST TUE FEB 16 2016

PAC011-029-045-091-170316-
/O.CAN.KPHI.FA.W.0005.000000T0000Z-160217T0600Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHESTER PA-BERKS PA-DELAWARE PA-MONTGOMERY PA-
1007 PM EST TUE FEB 16 2016

...THE FLOOD WARNING FOR RAIN AND SNOWMELT HAS BEEN CANCELLED FOR
CHESTER...SOUTHEASTERN BERKS...CENTRAL DELAWARE AND NORTHWESTERN
MONTGOMERY COUNTIES...

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 4048 7564 4025 7525 4009 7544 3998 7531
      3986 7551 3982 7572 4010 7592 4013 7585
      4023 7592

$$

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.