Alert archive / Pennsylvania / Flash Flood Warnings in 2019

Flash Flood Warning 64, NWS Philadelphia/Mount Holly

July 21, 20195 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 21, 2019, 11:38 PM EDT for 5 counties in Pennsylvania. It was in force for 2 hr. 1 report 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: Jul 21, 2019, 11:38 PM EDT (03:38 UTC)
Expired: Jul 22, 2019, 1:39 AM EDT
In force: 2 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Berks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 120 km from the middle of the area, began a volume at 03:41 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
Jul 22, 12:10 AM EDT	FLASH FLOOD	Laurys Station, PA	PA ROUTE 145 WAS CLOSED IN NORTH WHITEHALL TOWNSHIP DUE TO FLASH FLOODING.

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

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 3.6 hours before the alert went out and 211 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: 2295 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 1588 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

704 
WGUS51 KPHI 220338
FFWPHI
PAC011-025-077-089-095-220930-
/O.NEW.KPHI.FF.W.0064.190722T0338Z-190722T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1138 PM EDT Sun Jul 21 2019

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Northern Berks County in eastern Pennsylvania...
  Lehigh County in eastern Pennsylvania...
  Southeastern Carbon County in northeastern Pennsylvania...
  South central Monroe County in northeastern Pennsylvania...
  Northampton County in eastern Pennsylvania...

* Until 530 AM EDT.

* At 1135 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Flash flooding is expected to 
  begin shortly in the areas of heaviest rain.

* Some locations that could experience flooding include...
  Allentown, Easton, Lehighton, Bethlehem, Forks, Northampton,
  Wilson, Hellertown, Nazareth, Palmerton, Bangor, Jim Thorpe,
  Slatington, Pen Argyl, Wind Gap, Bath, Walnutport, Belfast, West
  Easton and Tatamy.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other poor drainage areas and low lying spots.

&&

LAT...LON 4065 7598 4074 7576 4082 7588 4097 7512
      4087 7505 4085 7507 4085 7510 4082 7508
      4077 7513 4078 7517 4075 7519 4068 7520
      4068 7517 4065 7520 4062 7519 4056 7529
      4062 7600

$$

Iovino

1 follow-up statement

260 
WGUS71 KPHI 220539
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
139 AM EDT Mon Jul 22 2019

PAC011-025-077-089-095-220549-
/O.CAN.KPHI.FF.W.0064.000000T0000Z-190722T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Lehigh PA-Carbon PA-Monroe PA-Northampton PA-
139 AM EDT Mon Jul 22 2019

...THE FLASH FLOOD WARNING FOR NORTHERN BERKS...LEHIGH...SOUTHEASTERN
CARBON...SOUTH CENTRAL MONROE AND NORTHAMPTON COUNTIES IS
CANCELLED...

The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.

LAT...LON 4065 7598 4074 7576 4082 7588 4097 7512
      4087 7505 4085 7507 4085 7510 4082 7508
      4077 7513 4078 7517 4075 7519 4068 7520
      4068 7517 4065 7520 4062 7519 4056 7529
      4062 7600

$$

Iovino

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 8:25 PM EDT	Special Weather Statement	PHI	Carbon, Lehigh, Northampton	50 min
Jul 21, 8:44 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	46 min
Jul 21, 9:24 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Northampton	51 min
Jul 21, 9:30 PM EDT	Severe Thunderstorm Warning	PHI	Chester	45 min
Jul 21, 9:58 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	2 hr
Jul 21, 10:14 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	46 min
Jul 21, 10:30 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh, Northampton	3 hr
Jul 21, 10:31 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh, Northampton	3 hr
Jul 21, 10:35 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	40 min
Jul 21, 10:42 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	48 min
Jul 21, 10:54 PM EDT	Severe Thunderstorm Warning	PHI	Delaware	25 min
Jul 21, 10:58 PM EDT	Areal Flood Advisory	PHI	Berks, Chester, Montgomery	59 min
Jul 21, 11:05 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery	40 min
Jul 21, 11:31 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	44 min
Jul 21, 11:40 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Carbon, Lehigh, Montgomery, Northampton	50 min
Jul 22, 12:05 AM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	40 min
Jul 22, 12:45 AM EDT	Special Weather Statement	PHI	Monroe	30 min
Jul 22, 1:11 AM EDT	Special Weather Statement	PHI	Monroe	34 min
Jul 22, 5:32 AM EDT	Areal Flood Warning	PHI	Lehigh	49 min
Jul 22, 1:28 PM EDT	Special Weather Statement	PHI	Monroe	32 min
Jul 22, 1:50 PM EDT	Special Weather Statement	PHI	Northampton	25 min
Jul 22, 3:18 PM EDT	Special Weather Statement	PHI	Chester	57 min
Jul 22, 3:27 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	48 min
Jul 22, 3:33 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe, Northampton	7 hr
Jul 22, 3:39 PM EDT	Special Weather Statement	PHI	Berks	51 min
Jul 22, 3:47 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	58 min
Jul 22, 4:11 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	4 hr
Jul 22, 4:16 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	59 min
Jul 22, 4:40 PM EDT	Areal Flood Advisory	PHI	Delaware, Montgomery, Philadelphia	114 min
Jul 22, 4:55 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	50 min
Jul 22, 5:04 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	41 min
Jul 22, 5:05 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh, Northampton	4 hr
Jul 22, 5:14 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	61 min
Jul 22, 5:17 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	73 min
Jul 22, 5:34 PM EDT	Flash Flood Warning	PHI	Bucks, Lehigh, Montgomery, Northampton	4 hr
Jul 22, 5:40 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Philadelphia	80 min
Jul 22, 5:43 PM EDT	Areal Flood Advisory	PHI	Bucks	3 hr
Jul 22, 5:50 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	40 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.