Alert archive / Pennsylvania / Flash Flood Warnings in 2024
Flash Flood Warning 65, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 18, 2024, 8:28 PM EDT for Berks County, Lehigh County, Pennsylvania. It was in force for 3 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
- Aug 18, 2024, 8:28 PM EDT (00:28 UTC)
- Expired
- Aug 18, 2024, 11:21 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Berks County, PA, Lehigh County, PA
The radar
The Philadelphia radar (KDIX), 135 km from the middle of the area, began a volume at 00:29 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
Washington/Dulle, VA (KIAD), launched 00:00Z, 0.5 hours before the alert went out and 226 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
- 1185 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 1109 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 101 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.7
The text
As transmitted.
572
WGUS51 KPHI 190028
FFWPHI
PAC011-077-190430-
/O.NEW.KPHI.FF.W.0065.240819T0028Z-240819T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
828 PM EDT Sun Aug 18 2024
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northeastern Berks County in eastern Pennsylvania...
Central Lehigh County in eastern Pennsylvania...
* Until 1230 AM EDT.
* At 828 PM EDT, Doppler radar 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.
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...
Kutztown, Hamburg, Shoemakersville, Lenhartsville and Claussville.
This includes the following highways...
Northeast Extension near mile marker 62.
Interstate 78 in Pennsylvania between mile markers 35 and 53.
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.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4044 7590 4048 7594 4054 7601 4058 7592
4061 7584 4064 7575 4066 7561 4066 7559
4065 7559 4058 7558 4054 7564 4046 7586
FLASH FLOOD...RADAR INDICATED
$$
Hoeflich2 follow-up statements
835
WGUS71 KPHI 190047
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
847 PM EDT Sun Aug 18 2024
PAC011-077-190430-
/O.CON.KPHI.FF.W.0065.000000T0000Z-240819T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Lehigh PA-
847 PM EDT Sun Aug 18 2024
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT MONDAY
FOR NORTHEASTERN BERKS AND CENTRAL LEHIGH COUNTIES...
At 847 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 2 and 3 inches of rain have
fallen. Additional rainfall amounts of 1.5 to 2.5 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Life threatening flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets, and underpasses.
Some locations that may experience flash flooding include...
Kutztown, Hamburg, Shoemakersville, Lenhartsville and Claussville.
This includes the following highways...
Northeast Extension near mile marker 62.
Interstate 78 in Pennsylvania between mile markers 35 and 53.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4044 7590 4048 7594 4054 7601 4058 7592
4061 7584 4064 7575 4066 7561 4066 7559
4065 7559 4058 7558 4054 7564 4046 7586
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Hoeflich583
WGUS71 KPHI 190321
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1121 PM EDT Sun Aug 18 2024
PAC011-077-190331-
/O.CAN.KPHI.FF.W.0065.000000T0000Z-240819T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Lehigh PA-
1121 PM EDT Sun Aug 18 2024
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN BERKS AND
CENTRAL LEHIGH COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flood Watch remains in effect until 200 AM EDT for portions of
northern Delaware, New Jersey, and Pennsylvania.
&&
LAT...LON 4044 7590 4048 7594 4054 7601 4058 7592
4061 7584 4064 7575 4066 7561 4066 7559
4065 7559 4058 7558 4054 7564 4046 7586
$$
HoeflichNearby
Flash Flood Warnings in Pennsylvania, 2024Every flash flood warning in 2024
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.