Alert archive / Pennsylvania / Flash Flood Warnings in 2019

Flash Flood Warning 50, NWS Philadelphia/Mount Holly

July 11, 20194 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 11, 2019, 7:47 PM EDT for 4 counties in 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 11, 2019, 7:47 PM EDT (23:47 UTC)
Expired: Jul 11, 2019, 11:02 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Berks County, PA, Bucks County, PA, Lehigh County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 107 km from the middle of the area, began a volume at 23:48 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.8 hours before the alert went out and 228 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: 93 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 911 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

444 
WGUS51 KPHI 112347
FFWPHI
PAC011-017-077-091-120345-
/O.NEW.KPHI.FF.W.0050.190711T2347Z-190712T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
747 PM EDT Thu Jul 11 2019

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  East central Berks County in eastern Pennsylvania...
  North central Montgomery County in southeastern Pennsylvania...
  South central Lehigh County in eastern Pennsylvania...
  West central Bucks County in southeastern Pennsylvania...

* Until 1145 PM EDT.

* At 746 PM EDT, Doppler radar indicated thunderstorms were ending 
  across the warned area. But with three to six inches of rain 
  falling earlier today, it will take some time for all the water to 
  drain.

* Some locations that could experience flooding include...
  East Greenville, Bally, Green Lane, Geryville, Pennsburg and Red
  Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4045 7554 4047 7546 4048 7536 4033 7547
      4041 7564

$$

Kruzdlo

1 follow-up statement

135 
WGUS71 KPHI 120302
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1102 PM EDT Thu Jul 11 2019

PAC011-017-077-091-120311-
/O.CAN.KPHI.FF.W.0050.000000T0000Z-190712T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Montgomery PA-Lehigh PA-Bucks PA-
1102 PM EDT Thu Jul 11 2019

...THE FLASH FLOOD WARNING FOR EAST CENTRAL BERKS...NORTH CENTRAL
MONTGOMERY...SOUTH CENTRAL LEHIGH AND WEST CENTRAL BUCKS COUNTIES IS
CANCELLED...

An areal flood warning is now in effect. Flood waters are receding 
and will continue to recede overnight. Please continue to heed any 
remaining road closures.

LAT...LON 4045 7554 4047 7546 4048 7536 4033 7547
      4041 7564

$$

Meola

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 3:44 AM EDT	Flash Flood Watch	PHI	Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 2 more	18 hr
Jul 11, 12:33 PM EDT	Special Weather Statement	PHI	Chester	57 min
Jul 11, 1:23 PM EDT	Special Weather Statement	PHI	Chester, Delaware	52 min
Jul 11, 1:44 PM EDT	Severe Thunderstorm Warning	PHI	Delaware, Montgomery, Philadelphia	61 min
Jul 11, 2:41 PM EDT	Special Weather Statement	PHI	Philadelphia	64 min
Jul 11, 2:44 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	61 min
Jul 11, 2:50 PM EDT	Areal Flood Advisory Emergency	PHI	Berks, Chester, Montgomery	4 hr
Jul 11, 3:00 PM EDT	Flash Flood Warning	PHI	Berks, Chester, Montgomery	8 hr
Jul 11, 3:13 PM EDT	Areal Flood Advisory	PHI	Bucks, Carbon, Lehigh, Monroe, Northampton	4 hr
Jul 11, 3:33 PM EDT	Areal Flood Advisory	PHI	Northampton	4 hr
Jul 11, 3:45 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	4 hr
Jul 11, 4:45 PM EDT	Flash Flood Warning Emergency	PHI	Berks, Montgomery	4 hr
Jul 11, 5:12 PM EDT	Flash Flood Warning	PHI	Chester	4 hr
Jul 11, 5:20 PM EDT	Flash Flood Warning	PHI	Bucks, Chester, Montgomery	4 hr
Jul 11, 5:33 PM EDT	Areal Flood Advisory	PHI	Bucks	4 hr
Jul 11, 6:14 PM EDT	Severe Thunderstorm Warning	PHI	Delaware, Montgomery, Philadelphia	61 min
Jul 11, 6:15 PM EDT	Flash Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Jul 11, 6:17 PM EDT	Areal Flood Advisory	PHI	Bucks	4 hr
Jul 11, 6:28 PM EDT	River Flood Warning	PHI	Montgomery	22 hr
Jul 11, 6:57 PM EDT	River Flood Warning	PHI	Montgomery	12 hr
Jul 11, 7:03 PM EDT	River Flood Warning	PHI	Chester, Montgomery, Philadelphia	26 hr
Jul 11, 7:19 PM EDT	River Flood Warning	PHI	Chester	7 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2019 Every flash flood warning in 2019

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.