Alert archive / Pennsylvania / Flash Flood Warnings in 2026
Flash Flood Warning 2, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 14, 2026, 9:50 PM EDT for Chester 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
- Jun 14, 2026, 9:50 PM EDT (01:50 UTC)
- Expired
- Jun 15, 2026, 12:40 AM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Chester County, PA
The radar
The Dover AFB radar (KDOX), 123 km from the middle of the area, began a volume at 01:50 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, 1.8 hours before the alert went out and 159 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
- 916 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 1620 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 115 m²/s²
- 0-3 km storm-relative helicity
- 225 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 6.4
The text
As transmitted.
185
WGUS51 KPHI 150150
FFWPHI
PAC029-150600-
/O.NEW.KPHI.FF.W.0002.260615T0150Z-260615T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
950 PM EDT Sun Jun 14 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Southwestern Chester County in southeastern Pennsylvania...
* Until 200 AM EDT.
* At 950 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 1.5 inches of
rain have fallen. The expected rainfall rate is 1 to 2 inches in 1
hour. 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...
Coatesville, Downingtown, Kennett Square, Oxford, Parkesburg, West
Grove, Honey Brook, Cochranville, Homeville, Landenberg,
Kemblesville and Marshallton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 3973 7579 3972 7612 3974 7612 3973 7609
3975 7610 3976 7606 3983 7604 3983 7602
3985 7602 3985 7601 3987 7600 3987 7599
3993 7600 3993 7598 3995 7599 4004 7594
4010 7594 4005 7567 3982 7569
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
RCM2 follow-up statements
565
WGUS71 KPHI 150252
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1052 PM EDT Sun Jun 14 2026
PAC029-150600-
/O.CON.KPHI.FF.W.0002.000000T0000Z-260615T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chester PA-
1052 PM EDT Sun Jun 14 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 AM EDT MONDAY FOR
SOUTHWESTERN CHESTER COUNTY...
At 1052 PM EDT, local law enforcement reported thunderstorms
producing heavy rain across the warned area. Between 2 and 3 inches
of rain have fallen. The expected rainfall rate is 1 to 2 inches in
1 hour. Additional rainfall amounts of 1 to 2 inches are possible in
the warned area. Flash flooding is already occurring.
HAZARD...Life threatening flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets, and underpasses.
Some locations that may experience flash flooding include...
Coatesville, Downingtown, Kennett Square, Oxford, Parkesburg, West
Grove, Honey Brook, Cochranville, Homeville, Landenberg,
Kemblesville and Marshallton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 3973 7579 3972 7612 3974 7612 3973 7609
3975 7610 3976 7606 3983 7604 3983 7602
3985 7602 3985 7601 3987 7600 3987 7599
3993 7600 3993 7598 3995 7599 4004 7594
4010 7594 4005 7567 3982 7569
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
RCM307
WGUS71 KPHI 150440
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1240 AM EDT Mon Jun 15 2026
PAC029-150450-
/O.CAN.KPHI.FF.W.0002.000000T0000Z-260615T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chester PA-
1240 AM EDT Mon Jun 15 2026
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN CHESTER
COUNTY...
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.
&&
LAT...LON 3973 7579 3972 7612 3974 7612 3973 7609
3975 7610 3976 7606 3983 7604 3983 7602
3985 7602 3985 7601 3987 7600 3987 7599
3993 7600 3993 7598 3995 7599 4004 7594
4010 7594 4005 7567 3982 7569
$$
HoeflichThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 14, 8:16 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 44 min |
| Jun 14, 9:06 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 54 min |
| Jun 14, 9:54 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 51 min |
| Jun 14, 10:15 PM EDT | Flash Flood Warning | PHI | Chester, Delaware | 3 hr |
| Jun 14, 10:21 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 39 min |
| Jun 14, 10:26 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 3 hr |
| Jun 14, 10:38 PM EDT | Flash Flood Warning | PHI | Delaware | 3 hr |
| Jun 14, 10:44 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 46 min |
| Jun 14, 10:51 PM EDT | Flash Flood Warning | PHI | Bucks, Philadelphia | 3 hr |
| Jun 14, 10:58 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 47 min |
| Jun 14, 11:16 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 29 min |
| Jun 15, 1:37 AM EDT | Areal Flood Warning | PHI | Delaware | 4 hr |
| Jun 15, 2:12 AM EDT | River Flood Warning | PHI | Delaware | 2 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.