Alert archive / New Jersey / Flash Flood Warnings in 2021
Flash Flood Warning 46, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 19, 2021, 2:13 AM EDT for Bucks County, Philadelphia County, Pennsylvania; Burlington County, Camden County, Mercer County, New Jersey. It was in force for 4 hr. 2 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
- Aug 19, 2021, 2:13 AM EDT (06:13 UTC)
- Expired
- Aug 19, 2021, 6:09 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Burlington County, NJ, Camden County, NJ, Mercer County, NJ, Bucks County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 48 km from the middle of the area, began a volume at 06:13 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 |
|---|---|---|---|
| Aug 19, 2:51 AM EDT | FLASH FLOOD | 1 Nnw Holmesburg, PA | THE PENNYPACK CREEK REACHED MINOR FLOOD STAGE WITH A CREST OF 7.58 FT. |
| Aug 19, 2:51 AM EDT | FLASH FLOOD | 1 Ssw Summerdale, PA | FRANKFORD CREEK CRESTED AT MODERATE FLOOD STAGE OF 9.62 FT. |
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 00:00Z, 6.2 hours before the alert went out and 199 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
- 491 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 580 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
257
WGUS51 KPHI 190613
FFWPHI
NJC005-007-021-PAC017-101-191015-
/O.NEW.KPHI.FF.W.0046.210819T0613Z-210819T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
213 AM EDT Thu Aug 19 2021
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
South Central Mercer County in central New Jersey...
Northwestern Burlington County in southern New Jersey...
Northern Camden County in southern New Jersey...
Southeastern Bucks County in southeastern Pennsylvania...
Northeastern Philadelphia County in southeastern Pennsylvania...
* Until 615 AM EDT.
* At 213 AM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
0.5 and 1 inch of rain has fallen, with heavier rain still to
come. Additional rainfall amounts of 1 to 2 inches are possible in
the warned area. Flash flooding is expected to begin shortly.
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 will experience flash flooding include...
Philadelphia, Trenton, Camden, Bensalem, Willingboro, Florence,
Burlington, Bristol, Riverside, Palmyra, Bordentown, and Beverly.
This includes the following highways...
New Jersey Turnpike between exits 6 and 6A.
Pennsylvania Turnpike between mile markers 352 and 359.
Interstate 95 in Pennsylvania between mile markers 25 and 40.
Interstate 295 in New Jersey between mile markers 38 and 61.
Interstate 195 in New Jersey between mile markers 0 and 1.
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 3997 7509 3999 7514 4025 7485 4017 7465
3993 7494
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
JEO2 follow-up statements
229
WGUS71 KPHI 190653
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
253 AM EDT Thu Aug 19 2021
NJC005-007-190703-
/O.CAN.KPHI.FF.W.0046.000000T0000Z-210819T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-
253 AM EDT Thu Aug 19 2021
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN BURLINGTON AND
NORTHERN CAMDEN COUNTIES...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
LAT...LON 3999 7510 3999 7514 4025 7485 4017 7465
4017 7467 4017 7468 4018 7469 4018 7470
4018 7471 4017 7471 4017 7470 4016 7471
4015 7472 4014 7473 4012 7479 4013 7482
4010 7483 4006 7496
$$
NJC021-PAC017-101-191015-
/O.CON.KPHI.FF.W.0046.000000T0000Z-210819T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mercer NJ-Bucks PA-Philadelphia PA-
253 AM EDT Thu Aug 19 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 AM EDT THIS
MORNING FOR SOUTH CENTRAL MERCER, SOUTHEASTERN BUCKS, AND
NORTHEASTERN PHILADELPHIA COUNTIES...
At 253 AM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between 1
and 3 inches of rain have fallen. Additional rainfall amounts of 0.5
to 1 inch are possible in the warned area. Flash flooding is ongoing
or expected to begin shortly.
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 will experience flash flooding include...
Philadelphia, Trenton, Bensalem, Burlington, Bristol, Beverly,
Yardley, Tullytown, Langhorne, Levittown, Langhorn, and
Florence-Roebling.
This includes the following highways...
Pennsylvania Turnpike between mile markers 351 and 359.
Interstate 95 in Pennsylvania between mile markers 27 and 40.
Interstate 295 in New Jersey between mile markers 58 and 61.
Interstate 195 in New Jersey between mile markers 0 and 1.
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 3999 7510 3999 7514 4025 7485 4017 7465
4017 7467 4017 7468 4018 7469 4018 7470
4018 7471 4017 7471 4017 7470 4016 7471
4015 7472 4014 7473 4012 7479 4013 7482
4010 7483 4006 7496
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
JEO594
WGUS71 KPHI 191009
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
609 AM EDT Thu Aug 19 2021
NJC021-PAC017-101-191019-
/O.CAN.KPHI.FF.W.0046.000000T0000Z-210819T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mercer NJ-Bucks PA-Philadelphia PA-
609 AM EDT Thu Aug 19 2021
...FLASH FLOOD WARNING FOR SOUTH CENTRAL MERCER, SOUTHEASTERN BUCKS,
AND NORTHEASTERN PHILADELPHIA COUNTIES HAS BEEN REPLACED WITH A
FLOOD WARNING...
LAT...LON 3999 7510 3999 7514 4025 7485 4017 7465
4017 7467 4017 7468 4018 7469 4018 7470
4018 7471 4017 7471 4017 7470 4016 7471
4015 7472 4014 7473 4012 7479 4013 7482
4010 7483 4006 7496
$$
JEOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 8:53 PM EDT | Areal Flood Advisory | PHI | Berks | 3 hr |
| Aug 18, 9:10 PM EDT | Areal Flood Advisory | PHI | Lehigh, Monroe, Northampton | 3 hr |
| Aug 18, 9:30 PM EDT | Flash Flood Warning | PHI | Berks | 2 hr |
| Aug 18, 9:35 PM EDT | Areal Flood Advisory | PHI | Berks, Lehigh | 3 hr |
| Aug 18, 9:45 PM EDT | Areal Flood Advisory | PHI | Berks | 3 hr |
| Aug 18, 9:47 PM EDT | Special Weather Statement | PHI | Berks | 58 min |
| Aug 18, 10:16 PM EDT | Flash Flood Warning | PHI | Berks, Lehigh | 3 hr |
| Aug 18, 10:44 PM EDT | Flash Flood Warning | PHI | Lehigh, Monroe, Northampton | 4 hr |
| Aug 18, 10:50 PM EDT | Flash Flood Warning | PHI | Bucks, Chester, Montgomery | 4 hr |
| Aug 18, 11:19 PM EDT | Areal Flood Advisory | PHI | Bucks, Lehigh, Northampton | 3 hr |
| Aug 18, 11:19 PM EDT | Special Weather Statement | PHI | Bucks, Chester, Montgomery | 41 min |
| Aug 18, 11:47 PM EDT | Flash Flood Warning | PHI | Chester | 2 hr |
| Aug 19, 12:04 AM EDT | Special Weather Statement | PHI | Bucks, Delaware, Montgomery | 71 min |
| Aug 19, 12:26 AM EDT | Tornado Warning | PHI | Bucks, Montgomery | 34 min |
| Aug 19, 12:31 AM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery | 4 hr |
| Aug 19, 12:44 AM EDT | River Flood Warning | PHI | Chester | 5 hr |
| Aug 19, 12:47 AM EDT | Tornado Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 28 min |
| Aug 19, 12:48 AM EDT | Tornado Warning | PHI | Bucks | 27 min |
| Aug 19, 1:14 AM EDT | Special Weather Statement | PHI | Bucks, Delaware, Philadelphia | 91 min |
| Aug 19, 1:30 AM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Aug 19, 2:05 AM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| Aug 19, 4:33 AM EDT | Areal Flood Warning | PHI | Chester, Delaware | 4 hr |
| Aug 19, 6:09 AM EDT | Areal Flood Warning | PHI | Bucks, Philadelphia | 3 hr |
| Aug 19, 8:50 AM EDT | Areal Flood Warning | PHI | Montgomery, Philadelphia | 3 hr |
| Aug 19, 10:40 AM EDT | Areal Flood Warning | PHI | Delaware | 3 hr |
| Aug 19, 1:32 AM EDT | Small Craft Advisory | PHI | 5 hr | |
| Aug 19, 2:33 AM EDT | Tornado Warning | PHI | Morris | 27 min |
| Aug 19, 2:40 AM EDT | Tornado Warning | PHI | Morris | 24 min |
| Aug 19, 3:09 AM EDT | Tornado Warning | PHI | Mercer, Middlesex, Monmouth | 36 min |
Nearby
Flash Flood Warnings in New Jersey, 2021Flash Flood Warnings in Pennsylvania, 2021Every flash flood warning in 2021
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.