Alert archive / Pennsylvania / Flash Flood Warnings in 2019
Flash Flood Warning 81, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 14, 2019, 9:12 PM EDT for 4 counties in Pennsylvania. It was in force for 3 hr. 10 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 14, 2019, 9:12 PM EDT (01:12 UTC)
- Expired
- Aug 15, 2019, 12:15 AM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 81 km from the middle of the area, began a volume at 01:15 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 14, 9:17 PM EDT | FLASH FLOOD | 1 Se East Whiteland Twp, PA | LANCASTER AVENUE FLOODED AND CLOSED. NEARLY TWO FEET OF WATER ON PORTIONS OF THE ROAD WITH VEHICLES STUCK. |
| Aug 14, 9:18 PM EDT | FLASH FLOOD | 1 Ne Wayne, PA | WATER RESCUE IN PROGRESS NEAR THE INTERSECTION OF MATSONFORD ROAD AND KING OF PRUSSIA ROAD. |
| Aug 14, 9:19 PM EDT | HEAVY RAIN 1.5 | Wayne, PA | 1.5 INCHES IN 45 MINUTES. |
| Aug 14, 9:21 PM EDT | FLASH FLOOD | 2 N Villanova, PA | WATER RESCUE IN PROGRESS AT MATSONFORD ROAD AND GRISCOM ROAD. |
| Aug 14, 9:23 PM EDT | FLOOD | Broomall, PA | MPING REPORT OF STREET FLOODING IN THIS AREA. |
| Aug 14, 9:33 PM EDT | FLASH FLOOD | Berwyn, PA | U.S. HIGHWAY 30 CLOSED NEAR LAKESIDE AVENUE FROM FLASH FLOODING. |
| Aug 14, 9:41 PM EDT | FLASH FLOOD | 1 Nne Berwyn, PA | DOWNED TREE FROM HEAVY RAIN AND FLASH FLOODING NEAR THE VALLEY FORGE ROAD AND DEVON STATE ROAD INTERSECTION. |
| Aug 14, 9:42 PM EDT | FLOOD | 1 Wnw Villanova, PA | FLOODING ON INTERSTATE 476 NEAR THE U.S. HIGHWAY 30 INTERCHANGE. LANE RESTRICTIONS IN PLACE. |
| Aug 14, 9:43 PM EDT | FLASH FLOOD | 1 Nw Conshohocken, PA | CONSHOHOCKEN ROAD, FAIRFIELD ROAD, AND NEW ELM STREET CLOSED FROM FLASH FLOODING. |
| Aug 14, 10:04 PM EDT | FLASH FLOOD | 1 Nne Lawrence Park, PA | WATER RESCUE IN PROGRESS NEAR THE INTERCHANGE OF INTERSTATE 476 AND WEST CHESTER PIKE. |
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 00:00Z, 1.2 hours before the alert went out and 217 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
- 378 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 1458 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
347
WGUS51 KPHI 150112
FFWPHI
PAC029-045-091-101-150415-
/O.NEW.KPHI.FF.W.0081.190815T0112Z-190815T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
912 PM EDT Wed Aug 14 2019
The National Weather Service in Mount Holly NJ has issued a
* Flash Flood Warning for...
Southern Montgomery County in southeastern Pennsylvania...
Northeastern Chester County in southeastern Pennsylvania...
Northwestern Philadelphia County in southeastern Pennsylvania...
Northeastern Delaware County in southeastern Pennsylvania...
* Until 1215 AM EDT.
* At 912 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to two inches of rain have
already fallen in as little as 30 minutes. Flash flooding is
expected to begin shortly in the areas of heaviest rain.
* Some locations that could experience flooding include...
Philadelphia, West Chester, Norristown, Phoenixville, West
Norriton, East Norriton, Coatesville, Westtown, Downingtown,
Conshohocken, Ambler, Collegeville, Royersford, Jenkintown,
Narberth, Trappe, Rockledge, Abington, Bryn Athyn and Pughtown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4021 7520 4013 7504 4002 7515 3998 7526
3989 7580 4017 7580
$$
CS3 follow-up statements
771
WGUS71 KPHI 150143
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
943 PM EDT Wed Aug 14 2019
PAC029-045-091-101-150415-
/O.CON.KPHI.FF.W.0081.000000T0000Z-190815T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery PA-Chester PA-Philadelphia PA-Delaware PA-
943 PM EDT Wed Aug 14 2019
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 AM EDT FOR
SOUTHERN MONTGOMERY...NORTHEASTERN CHESTER...NORTHWESTERN
PHILADELPHIA AND NORTHEASTERN DELAWARE COUNTIES...
At 942 PM EDT, local law enforcement reported flash flooding in
Wayne, Malvern, and Radnor. Several water rescues are occurring at
this time in these areas, with several roads inundated. Flash
flooding is expected to continue for the next couple of hours.
Some locations that could experience flooding include...
Philadelphia, West Chester, Norristown, Phoenixville, West Norriton,
East Norriton, Coatesville, Westtown, Downingtown, Conshohocken,
Ambler, Collegeville, Royersford, Jenkintown, Narberth, Trappe,
Rockledge, Abington, Bryn Athyn and Pughtown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4021 7520 4013 7504 4002 7515 3998 7526
3989 7580 4017 7580
$$
CS889
WGUS71 KPHI 150219
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1019 PM EDT Wed Aug 14 2019
PAC029-045-091-101-150415-
/O.CON.KPHI.FF.W.0081.000000T0000Z-190815T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery PA-Chester PA-Philadelphia PA-Delaware PA-
1019 PM EDT Wed Aug 14 2019
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 AM EDT FOR
SOUTHERN MONTGOMERY...NORTHEASTERN CHESTER...NORTHWESTERN
PHILADELPHIA AND NORTHEASTERN DELAWARE COUNTIES...
At 1017 PM EDT, local law enforcement reported flash flooding in
Wayne, Radnor, Conshohocken, Malvern, and Marple Township. Several
water rescues have been reported in these areas, and numerous roads
are inundated and closed at this time. Though the heavy rainfall has
ended, runoff will continue to cause flash flooding for the next
couple of hours.
Some locations that could experience flooding include...
Philadelphia, West Chester, Norristown, Phoenixville, West Norriton,
East Norriton, Westtown, Downingtown, Conshohocken, Ambler,
Collegeville, Royersford, Jenkintown, Narberth, Trappe, Rockledge,
Abington, Bryn Athyn, Bryn Mawr and Marshallton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4021 7520 4013 7504 4002 7515 3998 7526
3989 7580 4018 7564
$$
CS768
WGUS71 KPHI 150407
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1207 AM EDT Thu Aug 15 2019
PAC029-045-091-101-150416-
/O.EXP.KPHI.FF.W.0081.000000T0000Z-190815T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery PA-Chester PA-Philadelphia PA-Delaware PA-
1207 AM EDT Thu Aug 15 2019
...THE FLASH FLOOD WARNING FOR SOUTHERN MONTGOMERY...NORTHEASTERN
CHESTER...NORTHWESTERN PHILADELPHIA AND NORTHEASTERN DELAWARE
COUNTIES WILL EXPIRE AT 1215 AM EDT...
Most waterways in the warned area have already crested or are in the
process of cresting. Flood waters will continue to recede. Please
continue to heed any remaining road closures.
LAT...LON 4021 7520 4013 7504 4002 7515 3998 7526
3989 7580 4018 7564
$$
SFJThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 8:09 PM EDT | Special Weather Statement | PHI | Chester | 36 min |
| Aug 14, 8:16 PM EDT | Areal Flood Advisory | PHI | Bucks, Chester, Montgomery, Philadelphia | 119 min |
| Aug 14, 8:48 PM EDT | Special Weather Statement | PHI | Delaware, Philadelphia | 42 min |
| Aug 14, 8:56 PM EDT | Areal Flood Advisory | PHI | Chester, Delaware, Montgomery, Philadelphia | 2 hr |
| Aug 15, 2:23 AM EDT | Dense Fog Advisory | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 6 hr |
| Aug 15, 3:42 PM EDT | Severe Thunderstorm Warning | PHI | Carbon | 48 min |
| Aug 15, 4:22 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe, Northampton | 53 min |
| Aug 15, 5:18 PM EDT | Special Weather Statement | PHI | Monroe | 27 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2019Every flash flood warning in 2019
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.