Alert archive / Pennsylvania / Flash Flood Warnings in 2021
Flash Flood Warning 3, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 3, 2021, 7:09 PM EDT for Camden County, Gloucester County, Salem County, New Jersey; New Castle County, Delaware; 4 counties in Pennsylvania. It was in force for 2 hr. 3 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
- Jun 3, 2021, 7:09 PM EDT (23:09 UTC)
- Expired
- Jun 3, 2021, 9:11 PM EDT
- In force
- 2 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties New Castle County, DE, Camden County, NJ, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Dover AFB radar (KDOX), 114 km from the middle of the area, began a volume at 23:11 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 |
|---|---|---|---|
| Jun 3, 7:25 PM EDT | FLOOD | 1 Ene Media, PA | FLOODING REPORTED ALONG 476 IN DELAWARE COUNTY. |
| Jun 3, 8:34 PM EDT | FLOOD | 1 Nne Rittenhouse Squar, PA | FLOODING REPORTED ALONG INTERSTATE 676. |
| Jun 3, 8:34 PM EDT | FLOOD | 1 N Rittenhouse Square, PA | CORRECTS PREVIOUS FLOOD REPORT FROM 1 NNE RITTENHOUSE SQUARE. FLOODING REPORTED ALONG INTERSTATE 676. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.2 hours before the alert went out and 170 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
- 73 J/kg
- Mixed-layer CIN
- -52 J/kg
- Mixed-layer LCL
- 511 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 116 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
884
WGUS51 KPHI 032309
FFWPHI
DEC003-NJC007-015-033-PAC029-045-091-101-040300-
/O.NEW.KPHI.FF.W.0003.210603T2309Z-210604T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
709 PM EDT Thu Jun 3 2021
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northern New Castle County in northern Delaware...
Northwestern Camden County in southern New Jersey...
Northwestern Gloucester County in southern New Jersey...
Northwestern Salem County in southern New Jersey...
Southern Chester County in southeastern Pennsylvania...
Delaware County in southeastern Pennsylvania...
Southeastern Montgomery County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
* Until 1100 PM EDT.
* At 709 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1 inch of rain
has 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.
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, Camden, Wilmington, Newark, West Chester, Chester,
Pennsville, Yeadon, Westtown, Carneys Point, Conshohocken, and
Palmyra.
This includes the following highways...
Pennsylvania Turnpike between mile markers 335 and 338.
Interstate 95 in Pennsylvania between mile markers 0 and 27.
Interstate 95 in Delaware between mile markers 0 and 23.
Interstate 76 in Pennsylvania between mile markers 330 and 351.
Interstate 295 in New Jersey between mile markers 0 and 15.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 676 in New Jersey between mile markers 2 and 4.
Interstate 476 in Pennsylvania between mile markers 0 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.
&&
LAT...LON 3972 7611 3973 7609 3974 7610 3976 7608
3976 7606 3980 7604 3980 7605 3981 7603
3983 7604 3983 7602 3985 7602 3984 7589
4014 7521 4001 7505 3999 7506 4000 7504
3998 7502 3957 7564 3962 7579 3972 7579
FLASH FLOOD...RADAR INDICATED
$$
NC1 follow-up statement
008
WGUS71 KPHI 040111
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
911 PM EDT Thu Jun 3 2021
DEC003-NJC007-015-033-PAC029-045-091-101-040121-
/O.CAN.KPHI.FF.W.0003.000000T0000Z-210604T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Camden NJ-Gloucester NJ-Salem NJ-Chester PA-Delaware
PA-Montgomery PA-Philadelphia PA-
911 PM EDT Thu Jun 3 2021
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHERN NEW CASTLE,
NORTHWESTERN CAMDEN, NORTHWESTERN GLOUCESTER, NORTHWESTERN SALEM,
SOUTHERN CHESTER, DELAWARE, SOUTHEASTERN MONTGOMERY, AND
PHILADELPHIA COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 1000 PM EDT for portions
of northern Delaware...southern New Jersey...and southeast
Pennsylvania.
LAT...LON 3972 7611 3973 7609 3974 7610 3976 7608
3976 7606 3980 7604 3980 7605 3981 7603
3983 7604 3983 7602 3985 7602 3984 7589
4014 7521 4001 7505 3999 7506 4000 7504
3998 7502 3957 7564 3962 7579 3972 7579
$$
NCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 3, 9:37 AM EDT | Flash Flood Watch | PHI | Burlington, Camden, Gloucester, Salem | 12 hr |
| Jun 3, 5:55 PM EDT | Special Marine Warning | PHI | 65 min | |
| Jun 3, 6:33 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Cape May, Cumberland, Salem | 42 min |
| Jun 3, 7:07 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more | 38 min |
| Jun 3, 7:13 PM EDT | Areal Flood Advisory | PHI | Burlington, Hunterdon, Mercer, Middlesex, Somerset | 3 hr |
| Jun 3, 7:52 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 38 min |
| Jun 3, 5:20 PM EDT | Areal Flood Advisory | PHI | New Castle | 3 hr |
| Jun 3, 5:33 PM EDT | Special Weather Statement | PHI | Sussex | 42 min |
| Jun 3, 3:02 PM EDT | Special Weather Statement | PHI | Berks | 43 min |
| Jun 3, 3:54 PM EDT | Special Weather Statement | PHI | Berks | 36 min |
| Jun 3, 5:14 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 27 min |
| Jun 3, 5:59 PM EDT | Flash Flood Warning | PHI | Berks, Chester | 108 min |
| Jun 3, 6:19 PM EDT | Flash Flood Warning | PHI | Berks, Chester, Montgomery | 115 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2021Flash Flood Warnings in New Jersey, 2021Flash Flood Warnings in Delaware, 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.