Alert archive / Pennsylvania / Flash Flood Warnings in 2017

Flash Flood Warning 10, NWS Philadelphia/Mount Holly

July 13, 2017Berks County, Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 13, 2017, 5:25 PM EDT for Berks County, Lehigh County, Pennsylvania. It was in force for 3 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: Jul 13, 2017, 5:25 PM EDT (21:25 UTC)
Expired: Jul 13, 2017, 8:30 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Berks County, PA, Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 143 km from the middle of the area, began a volume at 21:24 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 12:00Z, 9.4 hours before the alert went out and 212 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: 135 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 1715 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

236 
WGUS51 KPHI 132125
FFWPHI
PAC011-077-140030-
/O.NEW.KPHI.FF.W.0010.170713T2125Z-170714T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
525 PM EDT THU JUL 13 2017

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Berks County in eastern Pennsylvania...
  Lehigh County in eastern Pennsylvania...

* Until 830 PM EDT

* At 524 PM EDT...Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area...especially in the vicinity of 
  Reading. Up to two inches of rain has already fallen in a few 
  spots with more rain on the way. Flash flooding is expected to 
  begin shortly.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

&&

LAT...LON 4052 7634 4052 7625 4058 7605 4057 7602
      4065 7598 4073 7578 4048 7542 4042 7549
      4045 7553 4025 7569 4014 7587 4049 7643

$$

jjm

1 follow-up statement

452 
WGUS71 KPHI 132228
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
628 PM EDT THU JUL 13 2017

PAC077-132234-
/O.CAN.KPHI.FF.W.0010.000000T0000Z-170714T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lehigh PA-
628 PM EDT THU JUL 13 2017

...THE FLASH FLOOD WARNING FOR CENTRAL LEHIGH COUNTY IS CANCELLED...

Flooding is no longer expected to pose a threat. Please continue to
heed any remaining road closures.

LAT...LON 4049 7643 4052 7635 4052 7625 4058 7605
      4057 7602 4065 7598 4068 7589 4045 7553
      4025 7569 4014 7587

$$

PAC011-140030-
/O.CON.KPHI.FF.W.0010.000000T0000Z-170714T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-
628 PM EDT THU JUL 13 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM EDT FOR
BERKS COUNTY...

At 624 PM EDT...Doppler radar indicated thunderstorms still over 
Berks County but heaviest rain moving out of the area. Flash 
flooding from earlier rain is expected to continue over portions of 
Berks County through the early evening hours so the flash flood 
warning continues through 830 PM. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

&&

LAT...LON 4049 7643 4052 7635 4052 7625 4058 7605
      4057 7602 4065 7598 4068 7589 4045 7553
      4025 7569 4014 7587

$$

TA/JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 3:25 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	4 hr
Jul 13, 3:30 PM EDT	Special Weather Statement	PHI	Lehigh, Northampton	45 min
Jul 13, 4:06 PM EDT	Areal Flood Advisory	PHI	Bucks, Lehigh, Monroe, Northampton	114 min
Jul 13, 4:06 PM EDT	Special Weather Statement	PHI	Northampton	39 min
Jul 13, 4:08 PM EDT	Special Weather Statement	PHI	Schuylkill	37 min
Jul 13, 4:09 PM EDT	Special Weather Statement	PHI	Montgomery	36 min
Jul 13, 4:15 PM EDT	Severe Thunderstorm Warning	PHI	Berks	60 min
Jul 13, 4:34 PM EDT	Special Weather Statement	PHI	Chester	41 min
Jul 13, 4:36 PM EDT	Special Weather Statement	PHI	Lehigh	24 min
Jul 13, 4:42 PM EDT	Special Weather Statement	PHI	Montgomery, Philadelphia	48 min
Jul 13, 4:50 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Montgomery	115 min
Jul 13, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	40 min
Jul 13, 5:07 PM EDT	Areal Flood Advisory	PHI	Bucks, Delaware, Montgomery, Philadelphia	7 hr
Jul 13, 5:08 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	35 min
Jul 13, 5:08 PM EDT	Tornado Warning	PHI	Berks	22 min
Jul 13, 5:21 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Philadelphia	54 min
Jul 13, 5:26 PM EDT	Tornado Warning	PHI	Berks, Chester, Montgomery	28 min
Jul 13, 5:30 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	45 min
Jul 13, 5:31 PM EDT	Flash Flood Warning	PHI	Bucks	3 hr
Jul 13, 5:36 PM EDT	Special Weather Statement	PHI	Montgomery	39 min
Jul 13, 5:44 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	46 min
Jul 13, 5:56 PM EDT	Special Weather Statement	PHI	Berks	34 min
Jul 13, 6:28 PM EDT	Special Weather Statement	PHI	Bucks	47 min
Jul 13, 6:34 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery, Philadelphia	41 min
Jul 13, 7:03 PM EDT	Areal Flood Advisory	PHI	Chester, Montgomery	117 min
Jul 13, 7:12 PM EDT	Special Weather Statement	PHI	Philadelphia	48 min
Jul 13, 7:26 PM EDT	Special Weather Statement	PHI	Berks, Montgomery	64 min

Nearby

Flash Flood Warnings in Pennsylvania, 2017 Every flash flood warning in 2017

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.