Alert archive / Pennsylvania / Flash Flood Warnings in 2022

Flash Flood Warning 16, NWS Philadelphia/Mount Holly

August 22, 2022Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 22, 2022, 6:01 PM EDT for Lehigh County, Pennsylvania. It was in force for 111 min. 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: Aug 22, 2022, 6:01 PM EDT (22:01 UTC)
Expired: Aug 22, 2022, 7:52 PM EDT
In force: 111 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 131 km from the middle of the area, began a volume at 22:03 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
Aug 22, 6:30 PM EDT	HEAVY RAIN 3.27	Germansville, PA	TOTAL SINCE MIDNIGHT.

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 12:00Z, 10.0 hours before the alert went out and 231 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: 294 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 539 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 43 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

710 
WGUS51 KPHI 222201
FFWPHI
PAC077-230200-
/O.NEW.KPHI.FF.W.0016.220822T2201Z-220823T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
601 PM EDT Mon Aug 22 2022

The National Weather Service in Mount Holly has issued a

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

* Until 1000 PM EDT.

* At 601 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets, and underpasses as well as other
           drainage and low lying areas.

* Some locations that may experience flash flooding include...
  Slatington, Jordan Valley, Schnecksville, Neffs, New Tripoli, 
  Emerald, Coffeetown, Wanamakers, Coplay, and North Catasauqua.

This includes the following highways...
	Northeast Extension between mile markers 61 and 71.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive 
cars through flooded areas.

&&

LAT...LON 4066 7547 4059 7576 4068 7589 4071 7581
      4077 7569 4079 7561 4075 7560 4074 7559
      4073 7557 4072 7556 4073 7554 4074 7554
      4074 7553 4070 7551 4067 7549 4066 7548

FLASH FLOOD...RADAR INDICATED

$$

Iovino

1 follow-up statement

814 
WGUS71 KPHI 222352
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
752 PM EDT Mon Aug 22 2022

PAC077-230002-
/O.CAN.KPHI.FF.W.0016.000000T0000Z-220823T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lehigh PA-
752 PM EDT Mon Aug 22 2022

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN LEHIGH COUNTY...

Most of the heavy rain has ended. Flooding is no longer expected to 
pose a threat.

LAT...LON 4066 7547 4059 7576 4068 7589 4071 7581
      4077 7569 4079 7561 4075 7560 4074 7559
      4073 7557 4072 7556 4073 7554 4074 7554
      4074 7553 4070 7551 4067 7549 4066 7548

$$

Iovino

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 12:18 AM EDT	Areal Flood Advisory	PHI	Chester, Delaware	64 min
Aug 22, 2:01 AM EDT	Areal Flood Advisory	PHI	Philadelphia	99 min
Aug 22, 3:42 AM EDT	Areal Flood Advisory	PHI	Bucks	61 min
Aug 22, 11:39 AM EDT	Areal Flood Advisory	PHI	Bucks, Northampton	3 hr
Aug 22, 1:46 PM EDT	Areal Flood Advisory	PHI	Carbon, Lehigh, Monroe, Northampton	3 hr
Aug 22, 5:00 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh, Northampton	3 hr
Aug 22, 5:01 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Northampton	44 min
Aug 22, 5:44 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	46 min

Nearby

Flash Flood Warnings in Pennsylvania, 2022 Every flash flood warning in 2022

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.