Alert archive / Pennsylvania / Flash Flood Warnings in 2021
Flash Flood Warning 74, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 1, 2021, 7:05 PM EDT for Bucks County, Pennsylvania. It was in force for 8 hr. 19 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
- Sep 1, 2021, 7:05 PM EDT (23:05 UTC)
- Expired
- Sep 2, 2021, 3:00 AM EDT
- In force
- 8 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Emergency
- Flash flood emergency
- Damage threat
- Catastrophic
- Flood severity
- None
County Bucks County, PA
The radar
The Philadelphia radar (KDIX), 62 km from the middle of the area, began a volume at 23:04 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 |
|---|---|---|---|
| Sep 1, 7:10 PM EDT | FLASH FLOOD | 2 Ssw Richboro, PA | FLOODING CLOSED BRSTOL ROAD, OLD BRISTOL ROAD, CHINQUAPIN ROAD, AND GIBSON ROAD. TIME BASED ON DISPATCH REPORT. |
| Sep 1, 7:15 PM EDT | FLASH FLOOD | 1 Sw Wrightstown Twp, PA | THE GAUGE ON NESHAMINY CREEK AT PENNS PARK (PEPP1) REACHED FLOOD STAGE AT 715 PM 9/1. |
| Sep 1, 7:30 PM EDT | FLASH FLOOD | 1 E Souderton, PA | FLOODING CLOSED BETHLEHEM PIKE NORTH OF STATE HIGHWAY 309. TIME BASED ON DISPATCH REPORT. |
| Sep 1, 7:42 PM EDT | FLASH FLOOD | 1 Nw Bensalem, PA | FLOODING CLOSED GALLOWAY ROAD NEAR I-276. TIME BASED ON DISPATCH REPORT. |
| Sep 1, 7:54 PM EDT | FLASH FLOOD | Sellersville, PA | DIAMOND STREET AND MAIN STREET CLOSED FROM FLOODING. TIME BASED ON DISPATCH REPORT. |
| Sep 1, 7:55 PM EDT | FLASH FLOOD | 1 Se Perkasie, PA | STATE HIGHWAY 152 BETWEEN SELLERSVILLE AND PERKASIE CLOSED FROM FLOODING. TIME BASED ON DISPATCH REPORT. |
| Sep 1, 7:57 PM EDT | FLASH FLOOD | 2 E East Rockhill Twp, PA | STATE HIGHWAY 313 CLOSED FROM FLOODING NEAR EAST BRANCH PERKIOMEN CREEK. TIME BASED ON DISPATCH REPORT. |
| Sep 1, 8:00 PM EDT | FLASH FLOOD | 1 Nnw Silverdale, PA | CALLOWHILL ROAD AT SOUTH PERKASIE ROAD IS STARTING TO WASH AWAY. |
| Sep 1, 8:30 PM EDT | FLASH FLOOD | 2 Sse Village Shires, PA | THE GAUGE ON NESHAMINY CREEK NEAR LANGHORNE (LNGP1) REACHED FLOOD STAGE AT 830 PM 9/1, CRESTING AT 20.84 FEET (MAJOR FLOODING) AT 630 AM 9/2. |
| Sep 1, 9:11 PM EDT | FLASH FLOOD | 2 Ene Hilltown Twp, PA | HILLTOWN PIKE WASHED OUT FROM FLOODING. TIME BASED ON DISPATCH REPORT. |
| Sep 1, 9:27 PM EDT | FLASH FLOOD | Chalfont, PA | FLASH FLOODING OF NESHAMINY CREEK FORCED THE CLOSURE OF BUTLER AVENUE. TIME BASED ON DISPATCH REPORT. |
| Sep 1, 10:00 PM EDT | FLASH FLOOD | Milford Twp, PA | *** 1 FATAL *** ONE FATALITY FROM FLASH FLOODING IN MILFORD AFTER A VEHICLE BECAME STUCK IN FLOOD WATERS. |
| Sep 1, 11:31 PM EDT | FLASH FLOOD | 2 Ese East Rockhill Twp, PA | BLUE SCHOOL ROAD CLOSED FROM FLOODING. TIME BASED ON DISPATCH REPORT. |
| Sep 1, 11:32 PM EDT | FLASH FLOOD | 2 Ne Warminster, PA | MEARNS ROAD WASHED OUT FROM FLOODING. TIME BASED ON DISPATCH REPORT. |
| Sep 1, 11:41 PM EDT | FLASH FLOOD | 1 Nne Richboro, PA | WORTHINGTON MILL ROAD CLOSED FROM FLOODING. TIME BASED ON DISPATCH REPORT. |
| Sep 2, 12:45 AM EDT | FLASH FLOOD | 2 Ssw Wrightstown Twp, PA | STATE HIGHWAY 232 CLOSED OVER NESHAMINY CREEK FROM FLASH FLOODING. TIME BASED ON DISPATCH REPORT. |
| Sep 2, 1:00 AM EDT | HEAVY RAIN 6.8 | East Rockhill Twp, PA | |
| Sep 2, 1:37 AM EDT | FLASH FLOOD | 1 N Village Shires, PA | FLASH FLOODING OF NESHAMINY CREEK FORCED THE CLOSURE OF STATE HIGHWAY 332. TIME BASED ON DISPATCH REPORT. |
| Sep 2, 1:40 AM EDT | FLASH FLOOD | 1 Ese Eddington, PA | RADCLIFFE STREET AND STATE ROAD CLOSED FROM FLOODING. TIME BASED ON DISPATCH REPORT. |
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 12:00Z, 11.1 hours before the alert went out and 196 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
- 51 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 1274 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 201 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
971
WGUS51 KPHI 012305
FFWPHI
PAC017-020400-
/O.NEW.KPHI.FF.W.0074.210901T2305Z-210902T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
705 PM EDT Wed Sep 1 2021
...FLASH FLOOD EMERGENCY FOR A LARGE PORTION OF BUCKS COUNTY...
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Bucks County in southeastern Pennsylvania...
* Until midnight EDT.
* At 705 PM EDT, emergency management reported thunderstorms
producing heavy rain across the warned area. Between 3 and 7
inches of rain have fallen. Widespread flash flooding is occurring.
This is a FLASH FLOOD EMERGENCY for a large portion of Bucks
County. This is a PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER
GROUND NOW!
HAZARD...Life threatening flash flooding caused by
thunderstorms.
SOURCE...Emergency management reported.
IMPACT...This is a PARTICULARLY DANGEROUS SITUATION. SEEK
HIGHER GROUND NOW! Life threatening flash flooding of
low water crossings, small creeks and streams, urban
areas, highways, streets, and underpasses.
* Some locations that may experience flash flooding include...
Bensalem, Quakertown, Perkasie, Doylestown, Bedminster, Chalfont,
Tinicum, Newtown, Dublin, Langhorne, and Ivyland.
This includes the following highways...
Pennsylvania Turnpike between mile markers 347 and 355.
Interstate 95 in Pennsylvania between mile markers 36 and 37.
Northeast Extension between mile markers 39 and 44.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to higher ground now! This is an extremely dangerous and
life-threatening situation. Do not attempt to travel unless you are
fleeing an area subject to flooding or under an evacuation order.
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4024 7485 4007 7493 4009 7496 4012 7496
4014 7502 4042 7548 4058 7525
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CATASTROPHIC
$$
CMS3 follow-up statements
419
WGUS71 KPHI 012343
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
743 PM EDT Wed Sep 1 2021
PAC017-020400-
/O.CON.KPHI.FF.W.0074.000000T0000Z-210902T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bucks PA-
743 PM EDT Wed Sep 1 2021
...FLASH FLOOD EMERGENCY FOR A LARGE PORTION OF BUCKS COUNTY...
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT EDT TONIGHT
FOR BUCKS COUNTY...
At 743 PM EDT, emergency management reported flash flooding across
the warned area. Numerous water rescues are being conducted across
the county. Avoid traveling in this area tonight! Between 3 and 7
inches of rain have fallen. Flash flooding is already occurring.
This is a FLASH FLOOD EMERGENCY for a large portion of Bucks County.
This is a PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!
HAZARD...Life threatening flash flooding caused by heavy rain.
SOURCE...Emergency management reported.
IMPACT...This is a PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER
GROUND NOW! Life threatening flash flooding of low water
crossings, small creeks and streams, urban areas,
highways, streets, and underpasses.
Some locations that may experience flash flooding include...
Bensalem, Quakertown, Perkasie, Doylestown, Bedminster, Chalfont,
Tinicum, Newtown, Dublin, Langhorne, and Ivyland.
This includes the following highways...
Pennsylvania Turnpike between mile markers 347 and 355.
Interstate 95 in Pennsylvania between mile markers 36 and 37.
Northeast Extension between mile markers 40 and 44.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to higher ground now! This is an extremely dangerous and
life-threatening situation. Do not attempt to travel unless you are
fleeing an area subject to flooding or under an evacuation order.
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4024 7485 4007 7493 4009 7496 4012 7496
4014 7502 4042 7548 4058 7525
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CATASTROPHIC
$$
CMS358
WGUS51 KPHI 020332
FFWPHI
PAC017-020700-
/O.EXT.KPHI.FF.W.0074.000000T0000Z-210902T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1132 PM EDT Wed Sep 1 2021
The National Weather Service in Mount Holly has extended the
* Flash Flood Warning for...
Bucks County in southeastern Pennsylvania...
* Until 300 AM EDT.
* At 1132 PM EDT, emergency management reported flash flooding
across the warned area. Numerous roads remain closed with some
reported washed out. Several river and stream gauges remain in
flood. Avoid travel in the warned area. Between 4 and 8 inches of
rain have fallen. Flash flooding is already occurring.
HAZARD...Life threatening flash flooding caused by heavy rain.
SOURCE...Emergency management reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets, and underpasses.
* Some locations that may experience flash flooding include...
Philadelphia, Bensalem, Quakertown, Perkasie, Doylestown,
Bedminster, Chalfont, Tinicum, Newtown, Dublin, Langhorne, and
Ivyland.
This includes the following highways...
Pennsylvania Turnpike between mile markers 347 and 355.
Interstate 95 in Pennsylvania between mile markers 36 and 37.
Northeast Extension between mile markers 40 and 44.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4024 7485 4007 7493 4009 7496 4012 7496
4014 7502 4042 7548 4058 7525
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CMS888
WGUS71 KPHI 020653
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
253 AM EDT Thu Sep 2 2021
PAC017-020703-
/O.EXP.KPHI.FF.W.0074.000000T0000Z-210902T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bucks PA-
253 AM EDT Thu Sep 2 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 3 AM EDT EARLY THIS MORNING
FOR BUCKS COUNTY...
The flash flood warning has been replaced by a flood warning. Please
continue to heed road closures.
LAT...LON 4024 7485 4007 7493 4009 7496 4012 7496
4014 7502 4042 7548 4058 7525
$$
CMSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 6:19 AM EDT | Areal Flood Advisory | PHI | Chester, Delaware | 116 min |
| Sep 1, 6:49 AM EDT | Flash Flood Warning | PHI | Chester, Delaware, Philadelphia | 86 min |
| Sep 1, 11:24 AM EDT | Areal Flood Advisory | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 3 hr |
| Sep 1, 12:07 PM EDT | Flash Flood Warning | PHI | Carbon, Monroe | 4 hr |
| Sep 1, 1:29 PM EDT | Flash Flood Warning | PHI | Berks, Lehigh | 6 hr |
| Sep 1, 2:53 PM EDT | Flash Flood Warning | PHI | Berks, Chester, Delaware, Montgomery | 9 hr |
| Sep 1, 3:55 PM EDT | River Flood Warning | PHI | Montgomery | 36 hr |
| Sep 1, 3:55 PM EDT | River Flood Warning | PHI | Chester, Montgomery, Philadelphia | 43 hr |
| Sep 1, 3:55 PM EDT | River Flood Warning | PHI | Montgomery, Philadelphia | 41 hr |
| Sep 1, 3:55 PM EDT | River Flood Warning | PHI | Philadelphia | 39 hr |
| Sep 1, 3:55 PM EDT | River Flood Warning | PHI | Berks | 24 hr |
| Sep 1, 4:02 PM EDT | River Flood Warning | PHI | Monroe | 24 hr |
| Sep 1, 4:04 PM EDT | Areal Flood Warning | PHI | Carbon, Monroe, Northampton | 24 hr |
| Sep 1, 4:10 PM EDT | River Flood Warning | PHI | Monroe | 19 hr |
| Sep 1, 4:12 PM EDT | Flash Flood Warning | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 7 hr |
| Sep 1, 4:12 PM EDT | River Flood Warning | PHI | Lehigh, Northampton | 25 hr |
| Sep 1, 4:12 PM EDT | River Flood Warning | PHI | Lehigh, Northampton | 24 hr |
| Sep 1, 4:12 PM EDT | River Flood Warning | PHI | Carbon | 15 hr |
| Sep 1, 4:13 PM EDT | Tornado Warning | PHI | Chester | 32 min |
| Sep 1, 4:20 PM EDT | River Flood Warning | PHI | Montgomery | 22 hr |
| Sep 1, 4:21 PM EDT | River Flood Warning | PHI | Bucks | 29 hr |
| Sep 1, 4:42 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery | 6 hr |
| Sep 1, 5:07 PM EDT | River Flood Warning | PHI | Chester | 17 hr |
| Sep 1, 5:13 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 47 min |
| Sep 1, 5:15 PM EDT | Tornado Warning | PHI | Delaware, Montgomery, Philadelphia | 30 min |
| Sep 1, 5:26 PM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 9 hr |
| Sep 1, 5:34 PM EDT | Tornado Warning | PHI | Bucks, Montgomery, Philadelphia | 26 min |
| Sep 1, 5:42 PM EDT | Flash Flood Warning | PHI | Bucks | 10 hr |
| Sep 1, 5:57 PM EDT | Tornado Warning | PHI | Bucks | 33 min |
| Sep 1, 6:08 PM EDT | Flash Flood Warning | PHI | Monroe, Northampton | 6 hr |
| Sep 1, 6:20 PM EDT | Tornado Warning | PHI | Bucks | 40 min |
| Sep 1, 6:22 PM EDT | Tornado Warning | PHI | Philadelphia | 23 min |
| Sep 1, 6:38 PM EDT | River Flood Warning | PHI | Chester, Delaware | 26 hr |
| Sep 1, 6:42 PM EDT | Tornado Warning | PHI | Bucks, Philadelphia | 33 min |
| Sep 1, 6:59 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 61 min |
| Sep 1, 7:04 PM EDT | Tornado Warning | PHI | Bucks | 26 min |
| Sep 1, 7:22 PM EDT | Tornado Warning | PHI | Bucks | 11 min |
| Sep 1, 7:23 PM EDT | Areal Flood Warning | PHI | Berks, Lehigh | 14 hr |
| Sep 1, 7:31 PM EDT | Flash Flood Warning | PHI | Bucks | 4 hr |
| Sep 1, 7:53 PM EDT | River Flood Warning | PHI | Delaware | 13 hr |
Nearby
Flash 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.