Alert archive / Pennsylvania / Flash Flood Warnings in 2017

Flash Flood Warning 52, NWS Philadelphia/Mount Holly

September 5, 2017Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 5, 2017, 5:30 PM EDT for Berks County, Pennsylvania. It was in force for 4 hr. 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: Sep 5, 2017, 5:30 PM EDT (21:30 UTC)
Expired: Sep 5, 2017, 9:30 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 138 km from the middle of the area, began a volume at 21:33 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
Sep 5, 6:00 PM EDT	FLASH FLOOD	Moselem Springs, PA	RT 625 CLOSED AT EAGLE ROAD IN MOSELEM SPRINGS DUE TO FLOODING. MULTIPLE VEHICLES IN THE WATER.
Sep 5, 6:00 PM EDT	FLASH FLOOD	Moselem Springs, PA	FLOODED ROADS IN MOSELEM SPRINGS... PA

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, 9.5 hours before the alert went out and 221 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: 4 J/kg
Mixed-layer CIN: -324 J/kg
Mixed-layer LCL: 1529 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

210 
WGUS51 KPHI 052130
FFWPHI
PAC011-060130-
/O.NEW.KPHI.FF.W.0052.170905T2130Z-170906T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
530 PM EDT TUE SEP 5 2017

The National Weather Service in Mount Holly NJ has issued a

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

* Until 930 PM EDT

* At 529 PM EDT...Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to three inches of rain have
  already fallen. Flash flooding is expected to begin shortly in the
  areas of heaviest rain.

* Some locations that could experience flooding include...
  Kutztown and Shoemakersville. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4061 7580 4054 7571 4042 7592 4050 7600

$$

Kruzdlo

1 follow-up statement

982 
WGUS71 KPHI 060007
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
807 PM EDT TUE SEP 5 2017

PAC011-060016-
/O.CAN.KPHI.FF.W.0052.000000T0000Z-170906T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-
807 PM EDT TUE SEP 5 2017

...THE FLASH FLOOD WARNING FOR NORTHEASTERN BERKS COUNTY IS
CANCELLED...

The heavy rain has ended. Flood waters have receded. Flooding is no 
longer expected to pose a significant threat to life and property. 
Please continue to heed any remaining road closures.

LAT...LON 4061 7580 4054 7571 4042 7592 4050 7600

$$

JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 5, 3:59 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	31 min
Sep 5, 4:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Northampton	52 min
Sep 5, 4:34 PM EDT	Areal Flood Advisory	PHI	Berks	6 hr
Sep 5, 4:54 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	51 min
Sep 5, 5:14 PM EDT	Flash Flood Warning	PHI	Berks	4 hr
Sep 5, 5:19 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	56 min
Sep 5, 5:22 PM EDT	Areal Flood Advisory	PHI	Northampton	4 hr
Sep 5, 5:49 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	41 min
Sep 5, 6:03 PM EDT	Areal Flood Advisory	PHI	Lehigh, Northampton	3 hr
Sep 5, 6:19 PM EDT	Special Weather Statement	PHI	Chester, Delaware	41 min
Sep 5, 6:26 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	49 min
Sep 5, 6:44 PM EDT	Special Weather Statement	PHI	Bucks	31 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.