Alert archive / Pennsylvania / Flash Flood Warnings in 2013

Flash Flood Warning 24, NWS Philadelphia/Mount Holly

June 30, 2013Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 30, 2013, 12:49 PM EDT for Berks County, Pennsylvania. It was in force for 116 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 30, 2013, 12:49 PM EDT (16:49 UTC)
Expired: Jun 30, 2013, 2:45 PM EDT
In force: 116 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 129 km from the middle of the area, began a volume at 16:48 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.

What was reported inside it

Time	Report	Where	Remark
Jun 30, 1:00 PM EDT	FLASH FLOOD	Muhlenberg Twp, PA	SOME ROADWAY FLOODING REPORTED IN MUHLENBERG TWP.
Jun 30, 1:10 PM EDT	FLASH FLOOD	Fleetwood, PA	FLASH FLOODING ALONG MAIN STREET IN FLEETWOOD. ROADWAY UNDER WATER.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 4.8 hours before the alert went out and 216 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: 97 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 1167 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

078 
WGUS51 KPHI 301649
FFWPHI
PAC011-301845-
/O.NEW.KPHI.FF.W.0024.130630T1649Z-130630T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1249 PM EDT SUN JUN 30 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN BERKS COUNTY...

* UNTIL 245 PM EDT...

* AT 1242 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM THUNDERSTORMS OVER EASTERN BERKS COUNTY.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FAIRVIEW
  HGTS...FLEETWOOD...KUTZTOWN...LAURELDALE...LENHARTSVILLE...LYONS...
  TOPTON AND LEESPORT.

THUNDERSTORMS CONTINUE TO REDEVELOP NEAR AND JUST NORTH OF READING 
AND ARE PRODUCING TORRENTIAL RAINFALL.  THESE STORMS MAY ALSO BE 
PRODUCING WIND GUSTS TO 40 MPH AND LIGHTNING STRIKES. 

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 4049 7563 4038 7572 4029 7578 4040 7605
      4061 7587

$$

FORECASTER:  DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 11:18 AM EDT	Areal Flood Advisory	PHI	Chester	117 min
Jun 30, 11:45 AM EDT	Flash Flood Warning	PHI	Chester	5 hr
Jun 30, 12:03 PM EDT	Special Weather Statement	PHI	Delaware	42 min
Jun 30, 12:15 PM EDT	Areal Flood Advisory	PHI	Berks	60 min
Jun 30, 2:04 PM EDT	Flash Flood Warning	PHI	Berks	6 hr
Jun 30, 3:29 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	4 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.