Alert archive / Pennsylvania / Areal Flood Warnings in 2021
Areal Flood Warning 9, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood warning at Jul 12, 2021, 8:37 PM EDT for Bucks County, Philadelphia County, Pennsylvania; Burlington County, New Jersey. It was in force for 9 hr. 9 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
- Jul 12, 2021, 8:37 PM EDT (00:37 UTC)
- Expired
- Jul 13, 2021, 5:39 AM EDT
- In force
- 9 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Burlington County, NJ, Bucks County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 45 km from the middle of the area, began a volume at 00:39 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 |
|---|---|---|---|
| Jul 12, 8:41 PM EDT | HEAVY RAIN 5.04 | 1 Nnw Andalusia, PA | PERSONAL WEATHER STATION KPAPHILA284, AN AMBIENT WEATHER SENSOR. |
| Jul 12, 8:44 PM EDT | HEAVY RAIN 3.99 | Northeast Philadelphia, PA | KPNE ASOS MEASUREMENT. |
| Jul 12, 8:45 PM EDT | HEAVY RAIN 2.73 | 1 Wsw Cinnaminson, NJ | CWOP STATION AR824 CINNAMINSON. |
| Jul 12, 8:47 PM EDT | HEAVY RAIN 4.33 | 2 S Fieldsboro, NJ | CWOP STATION CW2398 BORDENTOWN. |
| Jul 12, 8:50 PM EDT | HEAVY RAIN 3.66 | 1 Sse Northeast Philade, PA | MESONET STATION 9068D 1 SE NORTHEAST PHILADELPHIA. |
| Jul 12, 8:54 PM EDT | HEAVY RAIN 2.62 | Delran, NJ | MESONET STATION BLRNG DELRAN. |
| Jul 12, 8:55 PM EDT | HEAVY RAIN 2.27 | 1 Wnw Palmyra, NJ | MESONET STATION PLMCP PALMYRA. |
| Jul 12, 9:54 PM EDT | HEAVY RAIN 7.63 | Florence, NJ | |
| Jul 12, 10:02 PM EDT | HEAVY RAIN 2.65 | Bordentown, NJ |
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, 0.6 hours before the alert went out and 193 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
- 196 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 501 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.2
The text
As transmitted.
500
WGUS41 KPHI 130037
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
837 PM EDT Mon Jul 12 2021
NJC005-PAC017-101-131200-
/O.NEW.KPHI.FA.W.0009.210713T0037Z-210713T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Bucks PA-Philadelphia PA-
837 PM EDT Mon Jul 12 2021
The National Weather Service in Mount Holly has issued a
* Flood Warning for...
Northwestern Burlington County in southern New Jersey...
Southeastern Bucks County in southeastern Pennsylvania...
Northeastern Philadelphia County in southeastern Pennsylvania...
* Until 800 AM EDT Tuesday.
* At 837 PM EDT, Doppler radar, rain gauges and weather spotters
indicated that from 6 to around 10 inches of rain fell in the
warned area today. While no additional heavy rain is expected,
residual flooding will continue overnight.
* Some locations that are experiencing flooding include...
Philadelphia, Bensalem, Willingboro, Florence, Burlington,
Bristol, Riverside, Palmyra, Bordentown, Beverly, and Tullytown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.
&&
LAT...LON 3999 7507 4004 7514 4006 7510 4007 7509
4014 7502 4022 7478 4017 7473 4015 7472
4016 7471 4018 7471 4018 7470 4014 7462
3996 7502 3998 7501 4000 7503
$$
Iovino3 follow-up statements
897
WGUS81 KPHI 130528
FLSPHI
Flood Statement
National Weather Service Mount Holly NJ
128 AM EDT Tue Jul 13 2021
NJC005-PAC017-101-131200-
/O.CON.KPHI.FA.W.0009.000000T0000Z-210713T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Bucks PA-Philadelphia PA-
128 AM EDT Tue Jul 13 2021
...FLOOD WARNING REMAINS IN EFFECT UNTIL 8 AM EDT THIS MORNING FOR
NORTHWESTERN BURLINGTON, SOUTHEASTERN BUCKS, AND NORTHEASTERN
PHILADELPHIA COUNTIES...
At 128 AM EDT, Doppler radar, rain gauges, and weather spotters
reported that between 6 and 10 inches of rain fell across the warned
area Monday afternoon and Monday night. Residual flooding will
continue through the overnight hours. While additional widespread
heavy rain should west of the warned area, additional pockets of
locally moderate rain may exacerbate flooding already occurring.
Some locations that will experience flooding include...
Philadelphia, Trenton, Bensalem, Willingboro, Florence,
Burlington, Bristol, Riverside, Palmyra, Bordentown, Beverly, and
Tullytown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Be aware of your surroundings and do not drive on flooded roads.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 3999 7507 4004 7514 4006 7510 4007 7509
4014 7502 4022 7478 4017 7473 4015 7472
4016 7471 4018 7471 4018 7470 4014 7462
3996 7502 3998 7501 4000 7503
$$
MPS714
WGUS81 KPHI 130710
FLSPHI
Flood Statement
National Weather Service Mount Holly NJ
310 AM EDT Tue Jul 13 2021
NJC005-130720-
/O.CAN.KPHI.FA.W.0009.000000T0000Z-210713T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-
310 AM EDT Tue Jul 13 2021
...FLOOD WARNING IS CANCELLED FOR NORTHWESTERN BURLINGTON COUNTY...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
A Flash Flood Watch remains in effect until 500 AM EDT for portions
of New Jersey...and Pennsylvania.
LAT...LON 3999 7507 4004 7514 4006 7510 4006 7509
4007 7509 4014 7502 4022 7478 4015 7472
4014 7474 4012 7478 4013 7482 4010 7484
4008 7486 4006 7494 4002 7501 4001 7505
3999 7506
$$
PAC017-101-131200-
/O.CON.KPHI.FA.W.0009.000000T0000Z-210713T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bucks PA-Philadelphia PA-
310 AM EDT Tue Jul 13 2021
...FLOOD WARNING REMAINS IN EFFECT UNTIL 8 AM EDT THIS MORNING FOR
SOUTHEASTERN BUCKS AND NORTHEASTERN PHILADELPHIA COUNTIES...
At 310 AM EDT, Doppler radar, rain gauges, and weather spotters
reported that between 6 and 10 inches of rain fell across the warned
area Monday afternoon and Monday night. Residual flooding will
continue through the morning hours. Roads may still be closed and
even washed out in the hardest hit areas.
Some locations that will experience flooding include...
Philadelphia, Trenton, Bensalem, Burlington, Bristol, Palmyra,
Beverly, Tullytown, Langhorne, Andalusia, Feasterville-Trevose,
and Levittown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3999 7507 4004 7514 4006 7510 4006 7509
4007 7509 4014 7502 4022 7478 4015 7472
4014 7474 4012 7478 4013 7482 4010 7484
4008 7486 4006 7494 4002 7501 4001 7505
3999 7506
$$
MPS745
WGUS81 KPHI 130939
FLSPHI
Flood Statement
National Weather Service Mount Holly NJ
539 AM EDT Tue Jul 13 2021
PAC017-101-130949-
/O.CAN.KPHI.FA.W.0009.000000T0000Z-210713T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bucks PA-Philadelphia PA-
539 AM EDT Tue Jul 13 2021
...FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN BUCKS AND
NORTHEASTERN PHILADELPHIA COUNTIES...
Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3999 7507 4004 7514 4006 7510 4006 7509
4007 7509 4014 7502 4022 7478 4015 7472
4014 7474 4012 7478 4013 7482 4010 7484
4008 7486 4006 7494 4002 7501 4001 7505
3999 7506
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 1:34 AM EDT | Areal Flood Advisory | PHI | Berks, Chester, Montgomery | 117 min |
| Jul 13, 3:44 PM EDT | Dense Fog Advisory | PHI | Bucks, Monroe, Northampton | 14 hr |
| Jul 12, 9:53 PM EDT | Areal Flood Advisory | PHI | Sussex, Warren | 3 hr |
| Jul 12, 10:34 PM EDT | Areal Flood Advisory | PHI | Morris | 3 hr |
| Jul 13, 8:09 AM EDT | Marine Dense Fog Advisory | PHI | 25 hr |
Nearby
Areal Flood Warnings in Pennsylvania, 2021Areal Flood Warnings in New Jersey, 2021Every areal 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.