Flash Flood Warning 41, NWS Philadelphia/Mount Holly

Issued

Aug 18, 2021, 10:44 PM EDT (02:44 UTC)

Expired

Aug 19, 2021, 2:45 AM EDT

In force

4 hr

Issued by

NWS Philadelphia/Mount Holly

Area

Storm-based polygon

Flood severity

None

Counties Lehigh County, PA, Monroe County, PA, Northampton County, PA

The Philadelphia radar (KDIX), 127 km from the middle of the area, began a volume at 02:43 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.

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

649 
WGUS51 KPHI 190244
FFWPHI
PAC077-089-095-190645-
/O.NEW.KPHI.FF.W.0041.210819T0244Z-210819T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1044 PM EDT Wed Aug 18 2021

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Central Lehigh County in eastern Pennsylvania...
  Central Northampton County in eastern Pennsylvania...
  South Central Monroe County in northeastern Pennsylvania...

* Until 245 AM EDT.

* At 1044 PM EDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  1.5 and 2.5 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 and automated gauges.

  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 will experience flash flooding include...
  Allentown, Bethlehem, Emmaus, Northampton, Nazareth, Bangor, Pen 
  Argyl, Wind Gap, Bath, Belfast, East Bangor, and Steuben.

This includes the following highways...
	Interstate 78 in Pennsylvania between mile markers 50 and 58.
	Northeast Extension between mile markers 53 and 63.

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 4054 7568 4075 7555 4081 7551 4081 7547
      4084 7549 4092 7543 4089 7516 4047 7557

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

JEO

268 
WGUS71 KPHI 190345
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1145 PM EDT Wed Aug 18 2021

PAC077-089-095-190645-
/O.CON.KPHI.FF.W.0041.000000T0000Z-210819T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lehigh PA-Monroe PA-Northampton PA-
1145 PM EDT Wed Aug 18 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM EDT THURSDAY 
FOR CENTRAL LEHIGH, CENTRAL NORTHAMPTON, AND SOUTH CENTRAL MONROE 
COUNTIES...

At 1145 PM EDT, emergency management reported thunderstorms 
producing heavy rain across the warned area. Several road closures 
have been reported in Lehigh County. Between 2.5 and 3.5 inches of 
rain have fallen. Additional rainfall amounts of 0.5 to 1 inch are 
possible in the warned area. Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Emergency management reported.

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 will experience flash flooding include...
  Allentown, Bethlehem, Emmaus, Northampton, Nazareth, Bangor, Pen 
  Argyl, Wind Gap, Bath, Belfast, East Bangor, and Steuben.

This includes the following highways...
	Interstate 78 in Pennsylvania between mile markers 49 and 58.
	Northeast Extension between mile markers 52 and 63.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4054 7568 4075 7555 4081 7551 4081 7547
      4084 7549 4092 7543 4089 7516 4047 7557

FLASH FLOOD...OBSERVED

$$

JEO

230 
WGUS71 KPHI 190641
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
241 AM EDT Thu Aug 19 2021

PAC077-089-095-190651-
/O.EXP.KPHI.FF.W.0041.000000T0000Z-210819T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lehigh PA-Monroe PA-Northampton PA-
241 AM EDT Thu Aug 19 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 245 AM EDT EARLY THIS MORNING 
FOR CENTRAL LEHIGH, CENTRAL NORTHAMPTON, AND SOUTH CENTRAL MONROE 
COUNTIES...

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

A Flash Flood Watch remains in effect until 800 AM EDT for portions 
of east central Pennsylvania...and northeast Pennsylvania.

LAT...LON 4054 7568 4075 7555 4081 7551 4081 7547
      4084 7549 4092 7543 4089 7516 4047 7557

$$

JEO

Flash Flood Warnings in Pennsylvania, 2021Every flash flood warning in 2021

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.