Alert archive / Pennsylvania / Areal Flood Warnings in 2021
Areal Flood Warning 16, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood warning at Aug 19, 2021, 6:09 AM EDT for Bucks County, Philadelphia County, Pennsylvania; Mercer County, New Jersey. 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 19, 2021, 6:09 AM EDT (10:09 UTC)
- Expired
- Aug 19, 2021, 9:00 AM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Mercer County, NJ, Bucks County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 40 km from the middle of the area, began a volume at 10:10 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
Brookhaven, NY (KOKX), launched 00:00Z, 10.2 hours before the alert went out and 185 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.
593
WGUS41 KPHI 191009
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
609 AM EDT Thu Aug 19 2021
NJC021-PAC017-101-191300-
/O.NEW.KPHI.FA.W.0016.210819T1009Z-210819T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mercer NJ-Bucks PA-Philadelphia PA-
609 AM EDT Thu Aug 19 2021
The National Weather Service in Mount Holly has issued a
* Flood Warning for...
South Central Mercer County in central New Jersey...
Southeastern Bucks County in southeastern Pennsylvania...
Northeastern Philadelphia County in southeastern Pennsylvania...
* Until 900 AM EDT.
* At 609 AM EDT, Doppler radar and automated rain gauges indicated
heavy rain fell across the warned area overnight. The rain has
ended, and conditions will continue to gradually improve. However,
some road closures remain in place and some small streams and
creeks may still be out of their banks. Residual flooding will
continue at least through mid-morning.
* Some locations that will experience 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.
&&
LAT...LON 3999 7510 3999 7514 4025 7485 4017 7465
4017 7468 4018 7470 4018 7471 4017 7471
4017 7470 4016 7471 4014 7474 4013 7476
4012 7479 4013 7482 4010 7484 4009 7486
4006 7496
$$
JEO1 follow-up statement
175
WGUS81 KPHI 191252
FLSPHI
Flood Statement
National Weather Service Mount Holly NJ
852 AM EDT Thu Aug 19 2021
NJC021-PAC017-101-191302-
/O.EXP.KPHI.FA.W.0016.000000T0000Z-210819T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mercer NJ-Bucks PA-Philadelphia PA-
852 AM EDT Thu Aug 19 2021
...FLOOD WARNING WILL EXPIRE AT 9 AM EDT THIS MORNING FOR SOUTH
CENTRAL MERCER, SOUTHEASTERN BUCKS, AND NORTHEASTERN PHILADELPHIA
COUNTIES...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
LAT...LON 3999 7510 3999 7514 4025 7485 4017 7465
4017 7468 4018 7470 4018 7471 4017 7471
4017 7470 4016 7471 4014 7474 4013 7476
4012 7479 4013 7482 4010 7484 4009 7486
4006 7496
$$
BAHThe 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, 2:13 AM EDT | Flash Flood Warning | PHI | Bucks, Philadelphia | 4 hr |
| Aug 19, 4:33 AM EDT | Areal Flood Warning | PHI | Chester, Delaware | 4 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
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.