Alert archive / Pennsylvania / Flash Flood Warnings in 2023
Flash Flood Warning 65, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 16, 2023, 9:40 AM EDT for 5 counties in 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
- Jul 16, 2023, 9:40 AM EDT (13:40 UTC)
- Expired
- Jul 16, 2023, 12:29 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 76 km from the middle of the area, began a volume at 13:43 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.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 1.7 hours before the alert went out and 220 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
- 275 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 570 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 97 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
948
WGUS51 KPHI 161340
FFWPHI
PAC017-029-045-091-101-161645-
/O.NEW.KPHI.FF.W.0065.230716T1340Z-230716T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
940 AM EDT Sun Jul 16 2023
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
South Central Bucks County in southeastern Pennsylvania...
Northeastern Chester County in southeastern Pennsylvania...
Northeastern Delaware County in southeastern Pennsylvania...
Southeastern Montgomery County in southeastern Pennsylvania...
Northwestern Philadelphia County in southeastern Pennsylvania...
* Until 1245 PM EDT.
* At 940 AM EDT, Doppler radar indicated heavy rain across the
warned area. Between 0.5 and 1.5 inches of rain have fallen.
Additional rainfall amounts of 1 to 1.5 inches are possible in the
warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by heavy rain.
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...
Philadelphia, Norristown, West Norriton, East Norriton,
Conshohocken, Hatboro, Ambler, Jenkintown, Narberth, Rockledge,
Abington, and Bryn Athyn.
This includes the following highways...
Pennsylvania Turnpike between mile markers 324 and 348.
Interstate 76 in Pennsylvania between mile markers 327 and 342.
Interstate 476 in Pennsylvania between mile markers 7 and 19.
Northeast Extension between mile markers 21 and 22.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4007 7548 4016 7528 4025 7509 4014 7502
4013 7501 4007 7509 3998 7521 3994 7537
3998 7546 3999 7545 4004 7541 4006 7539
FLASH FLOOD...RADAR INDICATED
$$
MJL2 follow-up statements
308
WGUS71 KPHI 161524
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1124 AM EDT Sun Jul 16 2023
PAC029-161534-
/O.CAN.KPHI.FF.W.0065.000000T0000Z-230716T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chester PA-
1124 AM EDT Sun Jul 16 2023
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN CHESTER
COUNTY...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
A Flood Watch remains in effect until 1200 AM EDT Monday for
portions of northern Delaware...New Jersey...and Pennsylvania.
LAT...LON 4007 7536 4012 7534 4016 7528 4025 7509
4018 7505 4013 7507 4007 7509 4005 7512
3998 7521 3998 7527 3998 7528 3998 7533
4003 7538 4006 7536
$$
PAC017-045-091-101-161645-
/O.CON.KPHI.FF.W.0065.000000T0000Z-230716T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bucks PA-Delaware PA-Montgomery PA-Philadelphia PA-
1124 AM EDT Sun Jul 16 2023
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 PM EDT THIS
AFTERNOON FOR SOUTH CENTRAL BUCKS, NORTHEASTERN DELAWARE,
SOUTHEASTERN MONTGOMERY, AND NORTHWESTERN PHILADELPHIA COUNTIES...
At 1124 AM EDT, Doppler radar indicated heavy rain across the warned
area. Between 1 and 2 inches of rain have fallen. Flash flooding is
ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by heavy rain.
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...
Philadelphia, Norristown, East Norriton, Conshohocken, Hatboro,
Ambler, Jenkintown, Narberth, Rockledge, Abington, Bryn Athyn, and
Ivyland.
This includes the following highways...
Pennsylvania Turnpike between mile markers 330 and 346.
Interstate 76 in Pennsylvania between mile markers 330 and 342.
Interstate 476 in Pennsylvania between mile markers 11 and 19.
Northeast Extension between mile markers 21 and 22.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4007 7536 4012 7534 4016 7528 4025 7509
4018 7505 4013 7507 4007 7509 4005 7512
3998 7521 3998 7527 3998 7528 3998 7533
4003 7538 4006 7536
FLASH FLOOD...RADAR INDICATED
$$
MJL943
WGUS71 KPHI 161629
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1229 PM EDT Sun Jul 16 2023
PAC017-045-091-101-161639-
/O.CAN.KPHI.FF.W.0065.000000T0000Z-230716T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bucks PA-Delaware PA-Montgomery PA-Philadelphia PA-
1229 PM EDT Sun Jul 16 2023
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTH CENTRAL BUCKS,
NORTHEASTERN DELAWARE, SOUTHEASTERN MONTGOMERY, AND NORTHWESTERN
PHILADELPHIA COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat.
A Flood Watch remains in effect until 1200 AM EDT Monday for
portions of northern Delaware...New Jersey...and Pennsylvania.
LAT...LON 4007 7536 4012 7534 4016 7528 4025 7509
4018 7505 4013 7507 4007 7509 4005 7512
3998 7521 3998 7527 3998 7528 3998 7533
4003 7538 4006 7536
$$
MJLThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 8:37 PM EDT | Areal Flood Advisory | PHI | Carbon | 19 min |
| Jul 15, 8:44 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 30 min |
| Jul 15, 8:56 PM EDT | Flash Flood Warning | PHI | Carbon | 95 min |
| Jul 16, 12:50 AM EDT | Special Weather Statement | PHI | Berks | 25 min |
| Jul 16, 1:41 AM EDT | Special Weather Statement | PHI | Carbon, Lehigh | 34 min |
| Jul 16, 2:12 AM EDT | Special Weather Statement | PHI | Carbon, Lehigh, Monroe | 33 min |
| Jul 16, 2:43 AM EDT | Flash Flood Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 4 hr |
| Jul 16, 2:47 AM EDT | Special Weather Statement | PHI | Chester, Delaware | 28 min |
| Jul 16, 3:40 AM EDT | Flash Flood Warning | PHI | Monroe, Northampton | 7 hr |
| Jul 16, 4:05 AM EDT | Flash Flood Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 6 hr |
| Jul 16, 4:14 AM EDT | Special Weather Statement | PHI | Bucks | 31 min |
| Jul 16, 4:38 AM EDT | Tornado Warning | PHI | Bucks | 37 min |
| Jul 16, 9:12 AM EDT | Flash Flood Warning | PHI | Chester | 2 hr |
| Jul 16, 9:53 AM EDT | Tornado Warning | PHI | Montgomery, Philadelphia | 37 min |
| Jul 16, 10:54 AM EDT | Areal Flood Warning | PHI | Monroe, Northampton | 5 hr |
| Jul 16, 11:08 AM EDT | Flash Flood Warning | PHI | Delaware, Philadelphia | 3 hr |
| Jul 16, 12:22 PM EDT | Areal Flood Advisory | PHI | Bucks, Philadelphia | 3 hr |
| Jul 16, 12:26 PM EDT | Areal Flood Advisory | PHI | Philadelphia | 3 hr |
| Jul 16, 1:47 PM EDT | Areal Flood Advisory | PHI | Delaware, Philadelphia | 80 min |
| Jul 16, 6:44 PM EDT | Areal Flood Advisory | PHI | Bucks | 90 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2023Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.