Alert archive / Pennsylvania / Flash Flood Warnings in 2026
Flash Flood Warning 71, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 28, 2026, 1:02 PM EDT for Lehigh County, Monroe County, Northampton County, Pennsylvania. It was in force for 4 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 28, 2026, 1:02 PM EDT (17:02 UTC)
- Expired
- Jul 28, 2026, 5:00 PM 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 radar
The Philadelphia radar (KDIX), 118 km from the middle of the area, began a volume at 17:03 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.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 5.0 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.
- Mixed-layer CAPE
- 1266 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 637 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
333
WGUS51 KPHI 281702
FFWPHI
PAC077-089-095-282100-
/O.NEW.KPHI.FF.W.0071.260728T1702Z-260728T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
102 PM EDT Tue Jul 28 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Central Lehigh County in eastern Pennsylvania...
Northampton County in eastern Pennsylvania...
South Central Monroe County in northeastern Pennsylvania...
* Until 500 PM EDT.
* At 102 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across portions of the warned area. Between 0.5 and 1.5
inches of rain have fallen. The expected rainfall rate is 1.5 to
2.5 inches in 1 hour. Additional rainfall amounts of 0.5 to 1.5
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...
Allentown, Bethlehem, Emmaus, Northampton, Nazareth, Bangor, Pen
Argyl, Wind Gap, Bath, Belfast, Tatamy and East Bangor.
This includes the following highways...
Northeast Extension between mile markers 49 and 63.
Interstate 78 in Pennsylvania between mile markers 47 and 66.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4087 7507 4046 7551 4059 7572 4095 7521
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1.5-2.5 INCHES IN 1 HOUR
$$
Kruzdlo2 follow-up statements
568
WGUS71 KPHI 281857
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
257 PM EDT Tue Jul 28 2026
PAC077-281907-
/O.CAN.KPHI.FF.W.0071.000000T0000Z-260728T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lehigh PA-
257 PM EDT Tue Jul 28 2026
...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL LEHIGH COUNTY...
At this time, flooding is no longer expected to pose a threat.
A Flood Watch remains in effect until 800 PM EDT Wednesday for
portions of New Jersey and Pennsylvania.
&&
LAT...LON 4087 7507 4057 7539 4058 7540 4060 7539
4061 7539 4062 7538 4063 7539 4067 7543
4066 7548 4067 7549 4070 7551 4072 7553
4073 7553 4095 7521
$$
PAC089-095-282100-
/O.CON.KPHI.FF.W.0071.000000T0000Z-260728T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe PA-Northampton PA-
257 PM EDT Tue Jul 28 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 PM EDT THIS
AFTERNOON FOR NORTHAMPTON AND SOUTH CENTRAL MONROE COUNTIES...
At 257 PM EDT, Doppler radar indicated thunderstorms produced up to
2.50 inches of rain across portions of the warned area. The rain
fell in short period of time with the heaviest rain falling between
Wind Gap and Pen Argyl.
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...
Bethlehem, Northampton, Nazareth, Bangor, Pen Argyl, Wind Gap,
Bath, Belfast, Tatamy, East Bangor, Steuben and Beersville.
This includes Interstate 78 in Pennsylvania near mile marker 65.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4087 7507 4057 7539 4058 7540 4060 7539
4061 7539 4062 7538 4063 7539 4067 7543
4066 7548 4067 7549 4070 7551 4072 7553
4073 7553 4095 7521
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1.5-2.5 INCHES IN 1 HOUR
$$
Kruzdlo501
WGUS71 KPHI 282053
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
453 PM EDT Tue Jul 28 2026
PAC089-095-282103-
/O.EXP.KPHI.FF.W.0071.000000T0000Z-260728T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe PA-Northampton PA-
453 PM EDT Tue Jul 28 2026
...FLASH FLOOD WARNING WILL EXPIRE AT 5 PM EDT THIS AFTERNOON FOR
NORTHAMPTON AND SOUTH CENTRAL MONROE COUNTIES...
Flood waters have receded. Please continue to heed any remaining
road closures.
A Flood Watch remains in effect until 800 PM EDT Wednesday for
portions of New Jersey and Pennsylvania as additional rainfall is
expected.
&&
LAT...LON 4087 7507 4057 7539 4058 7540 4060 7539
4061 7539 4062 7538 4063 7539 4067 7543
4066 7548 4067 7549 4070 7551 4072 7553
4073 7553 4095 7521
$$
AKLThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 8:01 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 23 min |
| Jul 28, 1:22 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh, Northampton | 38 min |
| Jul 28, 1:31 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 44 min |
| Jul 28, 1:49 PM EDT | Tornado Warning | PHI | Monroe, Northampton | 26 min |
| Jul 28, 2:15 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 45 min |
| Jul 28, 5:08 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh, Northampton | 15 min |
| Jul 28, 5:22 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 34 min |
| Jul 28, 5:29 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 61 min |
| Jul 28, 5:47 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Northampton | 43 min |
| Jul 28, 5:55 PM EDT | Flash Flood Warning | PHI | Berks | 3 hr |
| Jul 28, 6:16 PM EDT | Tornado Warning | PHI | Chester | 29 min |
| Jul 28, 6:17 PM EDT | Flash Flood Warning | PHI | Bucks, Lehigh, Northampton | 6 hr |
| Jul 28, 6:23 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 67 min |
| Jul 28, 6:46 PM EDT | Tornado Warning | PHI | Delaware | 29 min |
| Jul 28, 6:56 PM EDT | Flash Flood Warning | PHI | Bucks, Lehigh, Northampton | 5 hr |
| Jul 28, 7:06 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 54 min |
| Jul 28, 7:08 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 35 min |
| Jul 28, 7:11 PM EDT | Flash Flood Warning | PHI | Delaware, Philadelphia | 3 hr |
| Jul 28, 7:24 PM EDT | Flash Flood Warning | PHI | Chester | 4 hr |
| Jul 28, 7:31 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Northampton | 44 min |
| Jul 28, 7:55 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery | 4 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2026Every flash flood warning in 2026
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.