Alert archive / Pennsylvania / Flash Flood Warnings in 2023

Flash Flood Warning 14, NWS Philadelphia/Mount Holly

June 26, 2023Lehigh County, Northampton County, Pennsylvania; Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 26, 2023, 6:03 PM EDT for Lehigh County, Northampton County, Pennsylvania; Warren County, New Jersey. It was in force for 6 hr. 8 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: Jun 26, 2023, 6:03 PM EDT (22:03 UTC)
Expired: Jun 27, 2023, 12:00 AM EDT
In force: 6 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Warren County, NJ, Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 109 km from the middle of the area, began a volume at 22:02 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
Jun 26, 6:20 PM EDT	FLASH FLOOD	Tatamy, PA	911 Call Center reports road washed away near Bushkill Drive and Uhler Road. Time estimated.
Jun 26, 6:20 PM EDT	FLASH FLOOD	Tatamy, PA	911 Call Center reports road washed away near Bushkill Drive and Uhler Road. Time estimated.
Jun 26, 7:45 PM EDT	RAIN 2.14	1 Se Bethlehem Twp, PA	Mesonet station AU947 Bethlehem.
Jun 26, 7:45 PM EDT	RAIN 2.93	2 Wsw Forks Twp, PA	Mesonet station EW6498 Easton.
Jun 26, 7:45 PM EDT	RAIN 3.18	Martins Creek, PA	Mesonet station CW7539 Martins Creek.
Jun 26, 7:49 PM EDT	RAIN 2.72	Center Valley, PA	Mesonet station FW7623 Center Valley.
Jun 26, 10:00 PM EDT	RAIN 4.37	Forks Twp, PA	Report of 4.37 inches of rain today. Time given in report.
Jun 26, 10:35 PM EDT	RAIN 2.4	Bethlehem, PA	Spotter reports 2.4 inches of rain in Bethlehem, PA. Time given in report.

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, 10.1 hours before the alert went out and 207 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: 369 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 807 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

267 
WGUS51 KPHI 262203
FFWPHI
NJC041-PAC077-095-270000-
/O.NEW.KPHI.FF.W.0014.230626T2203Z-230627T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
603 PM EDT Mon Jun 26 2023

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Southwestern Warren County in northwestern New Jersey...
  Southeastern Lehigh County in eastern Pennsylvania...
  Southeastern Northampton County in eastern Pennsylvania...

* Until 800 PM EDT.

* At 603 PM EDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  1 and 2.5 inches of rain have fallen. Additional rainfall amounts 
  up to 0.5 inches are possible in the warned area. Flash flooding 
  is already occurring.

  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 may experience flash flooding include...
  Allentown, Easton, Bethlehem, Forks, Emmaus, Wilson, Hellertown, 
  Nazareth, Harmony, Belfast, West Easton, and Tatamy.

This includes the following highways...
	Interstate 78 in Pennsylvania between mile markers 59 and 76.
	Interstate 78 in New Jersey near mile marker 0.
	Northeast Extension between mile markers 47 and 51.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4066 7542 4081 7530 4077 7514 4077 7512
      4075 7512 4068 7516 4060 7529 4051 7539
      4046 7546 4049 7553

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

Staarmann

5 follow-up statements

531 
WGUS71 KPHI 262247
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
647 PM EDT Mon Jun 26 2023

NJC041-PAC077-095-270000-
/O.CON.KPHI.FF.W.0014.000000T0000Z-230627T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Warren NJ-Lehigh PA-Northampton PA-
647 PM EDT Mon Jun 26 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING 
FOR SOUTHWESTERN WARREN, SOUTHEASTERN LEHIGH, AND SOUTHEASTERN 
NORTHAMPTON COUNTIES...

At 647 PM EDT, the public reported thunderstorms producing heavy 
rain across the warned area. Between 1.5 and 3.5 inches of rain have 
fallen. The expected rainfall rate is 0.25 to 0.5 inches in 1 hour. 
Additional rainfall amounts up to 0.5 inches are possible in the 
warned area. Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Public 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 may experience flash flooding include...
  Allentown, Easton, Bethlehem, Forks, Emmaus, Wilson, Hellertown, 
  Nazareth, Harmony, Belfast, West Easton, and Tatamy.

This includes the following highways...
	Interstate 78 in Pennsylvania between mile markers 59 and 76.
	Interstate 78 in New Jersey near mile marker 0.
	Northeast Extension between mile markers 47 and 51.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4066 7542 4081 7530 4077 7514 4077 7512
      4075 7512 4068 7516 4060 7529 4051 7539
      4046 7546 4049 7553

FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...0.25-0.5 INCHES IN 1 HOUR

$$

Staarmann

284 
WGUS51 KPHI 262332
FFWPHI
NJC041-PAC077-095-270200-
/O.EXT.KPHI.FF.W.0014.000000T0000Z-230627T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
732 PM EDT Mon Jun 26 2023

The National Weather Service in Mount Holly has extended the

* Flash Flood Warning for...
  Southwestern Warren County in northwestern New Jersey...
  Southeastern Lehigh County in eastern Pennsylvania...
  Southeastern Northampton County in eastern Pennsylvania...

* Until 1000 PM EDT.

* At 732 PM EDT, local law enforcement reported thunderstorms 
  producing heavy rain across the warned area. Between 1.5 and 3.5 
  inches of rain have fallen. The expected rainfall rate is 0.5 to 1 
  inch in 1 hour. Additional rainfall amounts of 1.0 to 2.0 inches 
  are possible in the warned area through 10 PM. Flash flooding is 
  already occurring.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Law enforcement 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 may experience flash flooding include...
  Allentown, Easton, Bethlehem, Forks, Emmaus, Wilson, Hellertown, 
  Nazareth, Harmony, Belfast, West Easton, and Tatamy.

This includes the following highways...
	Interstate 78 in Pennsylvania between mile markers 59 and 76.
	Interstate 78 in New Jersey near mile marker 0.
	Northeast Extension between mile markers 47 and 51.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4066 7542 4081 7530 4077 7514 4077 7512
      4075 7512 4068 7516 4060 7529 4051 7539
      4046 7546 4049 7553

FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...0.5-1 INCH IN 1 HOUR

$$

Staarmann

739 
WGUS51 KPHI 270000
FFWPHI
NJC041-PAC077-095-270300-
/O.EXT.KPHI.FF.W.0014.000000T0000Z-230627T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
800 PM EDT Mon Jun 26 2023

The National Weather Service in Mount Holly has extended the

* Flash Flood Warning for...
  Southwestern Warren County in northwestern New Jersey...
  Southeastern Lehigh County in eastern Pennsylvania...
  Southeastern Northampton County in eastern Pennsylvania...

* Until 1100 PM EDT.

* At 800 PM EDT, local law enforcement reported thunderstorms 
  producing heavy rain across the warned area. Between 1.5 and 3.5 
  inches of rain have fallen. The expected rainfall rate is 1 to 1.5 
  inches in 1 hour. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area within the two hours. Flash flooding 
  is already occurring.

  HAZARD...Life threatening flash flooding caused by
           thunderstorms.

  SOURCE...Law enforcement reported.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets, and underpasses.

* Some locations that may experience flash flooding include...
  Allentown, Easton, Bethlehem, Forks, Emmaus, Wilson, Hellertown, 
  Nazareth, Harmony, Belfast, West Easton, and Tatamy.

This includes the following highways...
	Interstate 78 in Pennsylvania between mile markers 59 and 76.
	Interstate 78 in New Jersey near mile marker 0.
	Northeast Extension between mile markers 47 and 51.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4066 7542 4081 7530 4077 7514 4077 7512
      4075 7512 4068 7516 4060 7529 4051 7539
      4046 7546 4049 7553

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...1-1.5 INCHES IN 1 HOUR

$$

Staarmann

092 
WGUS51 KPHI 270211
FFWPHI
NJC041-PAC077-095-270400-
/O.EXT.KPHI.FF.W.0014.000000T0000Z-230627T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1011 PM EDT Mon Jun 26 2023

The National Weather Service in Mount Holly has extended the

* Flash Flood Warning for...
  Southwestern Warren County in northwestern New Jersey...
  Southeastern Lehigh County in eastern Pennsylvania...
  Southeastern Northampton County in eastern Pennsylvania...

* Until midnight EDT.

* At 1011 PM EDT, local law enforcement reported thunderstorms 
  producing heavy rain across the warned area. Between 2 and 4 
  inches of rain have fallen. Additional rainfall amounts up to 0.5 
  inches are possible in the warned area. Flash flooding is already 
  occurring.

  HAZARD...Life threatening flash flooding caused by
           thunderstorms.

  SOURCE...Law enforcement reported.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets, and underpasses.

* Some locations that may experience flash flooding include...
  Allentown, Easton, Bethlehem, Forks, Emmaus, Wilson, Hellertown, 
  Nazareth, Harmony, Belfast, West Easton, and Tatamy.

This includes the following highways...
	Interstate 78 in Pennsylvania between mile markers 59 and 76.
	Interstate 78 in New Jersey near mile marker 0.
	Northeast Extension between mile markers 47 and 51.

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 4066 7542 4081 7530 4077 7514 4077 7512
      4075 7512 4068 7516 4060 7529 4051 7539
      4046 7546 4049 7553

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

Staarmann

935 
WGUS71 KPHI 270403 RRC
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1203 AM EDT Tue Jun 27 2023

NJC041-PAC077-095-270413-
/O.EXP.KPHI.FF.W.0014.000000T0000Z-230627T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Warren NJ-Lehigh PA-Northampton PA-
1203 AM EDT Tue Jun 27 2023

...FLASH FLOOD WARNING HAS EXPIRED FOR SOUTHWESTERN WARREN, 
SOUTHEASTERN LEHIGH, AND SOUTHEASTERN NORTHAMPTON COUNTIES...

The Flash FLood Warning has been replaced by an Areal Flood Warning, 
which is in effect until 700 AM EDT. Additional rainfall amounts of 
0.5 to 1.5 inches are possible. Areas of flooding of low lying and 
urban areas is possible overnight.

A Flood Watch remains in effect until 300 AM EDT for portions of New 
Jersey...and Pennsylvania.

LAT...LON 4066 7542 4081 7530 4077 7514 4077 7512
      4075 7512 4068 7516 4060 7529 4051 7539
      4046 7546 4049 7553

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 26, 3:33 AM EDT	Flood Watch	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	23 hr
Jun 26, 8:41 AM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	49 min
Jun 26, 9:18 AM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe, Northampton	42 min
Jun 26, 9:47 AM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	43 min
Jun 26, 1:13 PM EDT	Severe Thunderstorm Warning	PHI	Berks	47 min
Jun 26, 1:35 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	40 min
Jun 26, 2:04 PM EDT	Severe Thunderstorm Warning	PHI	Berks	41 min
Jun 26, 2:06 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	39 min
Jun 26, 2:12 PM EDT	Tornado Warning	PHI	Berks, Lehigh	21 min
Jun 26, 2:21 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	54 min
Jun 26, 2:23 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh	107 min
Jun 26, 2:31 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	44 min
Jun 26, 2:32 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh	67 min
Jun 26, 2:40 PM EDT	Special Weather Statement	PHI	Bucks	35 min
Jun 26, 2:58 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	47 min
Jun 26, 3:02 PM EDT	Tornado Warning	PHI	Northampton	28 min
Jun 26, 3:03 PM EDT	Areal Flood Advisory	PHI	Monroe	104 min
Jun 26, 3:25 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	41 min
Jun 26, 3:56 PM EDT	Areal Flood Advisory	PHI	Monroe, Northampton	2 hr
Jun 26, 4:04 PM EDT	Special Weather Statement	PHI	Northampton	41 min
Jun 26, 4:50 PM EDT	Areal Flood Advisory	PHI	Lehigh, Northampton	73 min
Jun 26, 5:47 PM EDT	Special Weather Statement	PHI	Lebanon	28 min
Jun 26, 5:59 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	24 min
Jun 26, 6:00 PM EDT	Areal Flood Advisory	PHI	Monroe, Northampton	4 hr
Jun 26, 6:16 PM EDT	Special Weather Statement	PHI	Delaware	29 min
Jun 26, 6:26 PM EDT	Special Weather Statement	PHI	Chester	34 min
Jun 26, 6:37 PM EDT	Flash Flood Warning	PHI	Chester, Delaware	2 hr
Jun 26, 6:50 PM EDT	Special Weather Statement	PHI	Montgomery	25 min
Jun 26, 6:51 PM EDT	Special Weather Statement	PHI	Northampton	24 min
Jun 26, 7:13 PM EDT	Special Weather Statement	PHI	Bucks	32 min
Jun 26, 7:26 PM EDT	Special Weather Statement	PHI	Montgomery	34 min
Jun 26, 7:44 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery	31 min
Jun 26, 7:59 PM EDT	Special Weather Statement	PHI	Lehigh	31 min
Jun 26, 3:19 AM EDT	Small Craft Advisory	PHI		63 hr
Jun 26, 10:16 AM EDT	Special Weather Statement	PHI	Camden	14 min
Jun 26, 10:43 AM EDT	Special Weather Statement	PHI	Sussex	32 min
Jun 26, 11:18 AM EDT	Special Weather Statement	PHI	Sussex	27 min
Jun 26, 11:53 AM EDT	Special Weather Statement	PHI	Middlesex	22 min
Jun 26, 11:57 AM EDT	Severe Thunderstorm Warning	PHI	Sussex	18 min
Jun 26, 12:22 PM EDT	Special Weather Statement	PHI	Middlesex	38 min
Jun 26, 2:02 PM EDT	Special Weather Statement	PHI	Hunterdon	28 min
Jun 26, 2:32 PM EDT	Special Marine Warning	PHI		43 min
Jun 26, 2:49 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Warren	41 min
Jun 26, 2:54 PM EDT	Areal Flood Advisory	PHI	Hunterdon	95 min
Jun 26, 3:01 PM EDT	Special Weather Statement	PHI	Cumberland	29 min
Jun 26, 3:04 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Somerset	41 min
Jun 26, 3:17 PM EDT	Tornado Warning	PHI	Hunterdon, Somerset	28 min
Jun 26, 3:21 PM EDT	Special Weather Statement	PHI	Camden	24 min
Jun 26, 3:28 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	32 min
Jun 26, 3:40 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex	50 min
Jun 26, 3:45 PM EDT	Special Weather Statement	PHI	Burlington	30 min
Jun 26, 3:48 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	42 min
Jun 26, 3:59 PM EDT	Special Weather Statement	PHI	Sussex, Warren	46 min
Jun 26, 4:14 PM EDT	Special Weather Statement	PHI	Mercer	31 min
Jun 26, 4:16 PM EDT	Areal Flood Advisory	PHI	Morris, Somerset	101 min
Jun 26, 4:24 PM EDT	Special Weather Statement	PHI	Burlington	36 min
Jun 26, 4:50 PM EDT	Special Marine Warning	PHI		40 min
Jun 26, 5:01 PM EDT	Areal Flood Advisory	PHI	Morris	56 min
Jun 26, 5:09 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Salem	25 min
Jun 26, 5:09 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	39 min
Jun 26, 5:22 PM EDT	Special Marine Warning	PHI		23 min
Jun 26, 5:55 PM EDT	Flash Flood Warning	PHI	Hunterdon, Morris, Somerset, Sussex	6 hr
Jun 26, 6:08 PM EDT	Special Weather Statement	PHI	Hunterdon	37 min
Jun 26, 6:15 PM EDT	Special Weather Statement	PHI	Salem	30 min
Jun 26, 6:16 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	51 min
Jun 26, 6:55 PM EDT	Special Weather Statement	PHI	Hunterdon	35 min
Jun 26, 7:07 PM EDT	Flash Flood Warning	PHI	Hunterdon, Morris, Sussex, Warren	5 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2023 Flash Flood Warnings in New Jersey, 2023 Every flash flood warning in 2023

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.