Alert archive / Pennsylvania / Flash Flood Warnings in 2013

Flash Flood Warning 9, NWS Philadelphia/Mount Holly

June 10, 2013Berks County, Chester County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 10, 2013, 6:07 AM EDT for Berks County, Chester 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 10, 2013, 6:07 AM EDT (10:07 UTC)
Expired: Jun 10, 2013, 10:00 AM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

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

The radar

The Philadelphia radar (KDIX), 126 km from the middle of the area, began a volume at 10:09 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, 10.1 hours before the alert went out and 173 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: 289 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1002 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 175 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

330 
WGUS51 KPHI 101007
FFWPHI
PAC011-029-091-101400-
/O.NEW.KPHI.FF.W.0009.130610T1007Z-130610T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
607 AM EDT MON JUN 10 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN BERKS COUNTY...
  WEST CENTRAL MONTGOMERY COUNTY...
  CHESTER COUNTY...

* UNTIL 1000 AM EDT...

* AT 600 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN OVER PARTS OF CHESTER...SOUTHEASTERN BERKS AND
  WEST CENTRAL MONTGOMERY COUNTIES. RADAR INDICATED THAT SOME
  LOCATIONS WERE APPROACHING TWO INCHES OF RAINFALL.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  COATESVILLE...DOWNINGTOWN...MORGANTOWN AND POTTSTOWN.

ADDITIONAL RAINFALL AMOUNTS OF AN INCH TO AN INCH AN A HALF ARE 
POSSIBLE IN THE WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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. NEVER ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR IN AN
AUTOMOBILE. TURN AROUND DON'T DROWN!

&&

LAT...LON 3983 7602 3985 7603 3988 7599 3997 7600
      4003 7594 4011 7595 4014 7589 4018 7595
      4038 7587 4036 7540 3983 7562 3979 7572
      3972 7578 3972 7613

$$

IOVINO

1 follow-up statement

532 
WGUS71 KPHI 101341
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
941 AM EDT MON JUN 10 2013

PAC011-029-091-101350-
/O.CAN.KPHI.FF.W.0009.000000T0000Z-130610T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BERKS PA-MONTGOMERY PA-CHESTER PA-
941 AM EDT MON JUN 10 2013

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CHESTER...WEST
CENTRAL MONTGOMERY AND SOUTHEASTERN BERKS COUNTIES...

THE WATERS FROM THE EARLIER HEAVY RAINS ARE RECEDING AND FLOOD WATERS
NO LONGER POSE A THREAT TO LIFE OR PROPERTY. THEREFORE...THE FLASH
FLOOD WARNING HAS BEEN CANCELLED.

THE EAST BRANCH BRANDYWINE CREEK IS RUNNING HIGH IN THE VICINITY OF 
DOWNINGTOWN...AND A SEPARATE FLOOD WARNING REMAINS IN EFFECT FOR 
THAT STREAM.


LAT...LON 3983 7602 3985 7603 3988 7599 3997 7600
      4003 7594 4011 7595 4014 7589 4018 7595
      4038 7587 4036 7540 3983 7562 3979 7572
      3972 7578 3972 7613

$$

FORECASTER:JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 10, 3:30 AM EDT	Flood Watch	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	24 hr
Jun 10, 5:14 AM EDT	Areal Flood Advisory	PHI	Berks, Chester	4 hr
Jun 10, 5:53 AM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Lehigh, Montgomery, Northampton	4 hr
Jun 10, 7:18 AM EDT	Areal Flood Warning	PHI	Bucks, Montgomery, Philadelphia	3 hr
Jun 10, 9:04 AM EDT	River Flood Warning	PHI	Chester	5 hr
Jun 10, 12:35 PM EDT	Areal Flood Warning	PHI	Montgomery	17 hr
Jun 10, 4:02 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware, Philadelphia	4 hr
Jun 10, 4:10 PM EDT	Special Weather Statement	PHI	Chester	65 min
Jun 10, 4:30 PM EDT	Special Weather Statement	PHI	Delaware	60 min
Jun 10, 4:42 PM EDT	River Flood Warning	PHI	Chester, Delaware	12 hr
Jun 10, 5:06 PM EDT	Areal Flood Warning	PHI	Chester, Delaware	12 hr
Jun 10, 6:22 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	53 min
Jun 10, 6:28 PM EDT	Areal Flood Warning	PHI	Bucks	9 hr
Jun 10, 6:33 PM EDT	River Flood Warning	PHI	Delaware	5 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2013 Every flash flood warning in 2013

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.