Alert archive / Pennsylvania / Flash Flood Warnings in 2019
Flash Flood Warning 85, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Oct 31, 2019, 11:08 PM EDT for 6 counties in Pennsylvania. It was in force for 4 hr. 6 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
- Oct 31, 2019, 11:08 PM EDT (03:08 UTC)
- Expired
- Nov 1, 2019, 3:15 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Berks County, PA, Bucks County, PA, Chester County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 109 km from the middle of the area, began a volume at 03:11 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 |
|---|---|---|---|
| Oct 31, 11:30 PM EDT | FLASH FLOOD | 1 S Bethlehem Twp, PA | WILLOW PARK ROAD CLOSED FROM FLASH FLOODING. |
| Oct 31, 11:31 PM EDT | FLASH FLOOD | 1 Ese Allentown, PA | WATER RESCUE IN PROGRESS ON BASIN STREET. |
| Nov 1, 12:00 AM EDT | FLASH FLOOD | 2 Ene Steuben, PA | FLASH FLOODING ON NEWBURG ROAD NEAR ROUTE 191 WITH ROADS CLOSED. |
| Nov 1, 12:15 AM EDT | FLASH FLOOD | 1 Sse Coopersburg, PA | FLASH FLOODING CLOSED PORTIONS OF STATE HIGHWAY 309 IN SPRINGFIELD TWP. |
| Nov 1, 1:15 AM EDT | FLASH FLOOD | Perkiomen Creek At East, PA | THE GAUGE ON PERKIOMEN CREEK AT EAST GREENVILLE REACHED MINOR FLOOD STAGE. |
| Nov 1, 2:01 AM EDT | FLASH FLOOD | 2 Se Honey Brook Twp, PA | THE WEST BRANCH BRANDYWINE CREEK GAUGE AT HONEY BROOK REACHED MINOR FLOOD STAGE. |
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, 3.1 hours before the alert went out and 206 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
- 529 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 827 m above ground
- 0-6 km bulk shear
- 72 kt
- 0-1 km storm-relative helicity
- 623 m²/s²
- 0-3 km storm-relative helicity
- 752 m²/s²
- Significant tornado parameter
- 2.5
- Supercell composite
- 9.8
The text
As transmitted.
607
WGUS51 KPHI 010308
FFWPHI
PAC011-017-029-077-091-095-010715-
/O.NEW.KPHI.FF.W.0085.191101T0308Z-191101T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1108 PM EDT Thu Oct 31 2019
The National Weather Service in Mount Holly NJ has issued a
* Flash Flood Warning for...
Eastern Berks County in eastern Pennsylvania...
Montgomery County in southeastern Pennsylvania...
Lehigh County in eastern Pennsylvania...
Northwestern Bucks County in southeastern Pennsylvania...
Chester County in southeastern Pennsylvania...
Southwestern Northampton County in eastern Pennsylvania...
* Until 315 AM EDT.
* At 1108 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Flash flooding is expected to
begin shortly in the areas of heaviest rain.
* Some locations that could experience flooding include...
Allentown, Reading, Easton, West Chester, Bethlehem, Norristown,
Pottstown, Phoenixville, Lansdale, West Norriton, East Norriton,
Coatesville, Emmaus, Northampton, Quakertown, Perkasie, Doylestown,
Byram, Wilson and Downingtown.
This includes Interstate 78 in Pennsylvania between mile markers 45
and 76.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3976 7606 3987 7599 3995 7600 4004 7593
4011 7594 4014 7588 4023 7601 4057 7575
4083 7541 4066 7519 4057 7519 4058 7512
4054 7507 4045 7507 4040 7504 3972 7582
3972 7613
$$
CMS4 follow-up statements
285
WGUS71 KPHI 010347
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1147 PM EDT Thu Oct 31 2019
PAC011-017-029-077-091-095-010715-
/O.CON.KPHI.FF.W.0085.000000T0000Z-191101T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Montgomery PA-Lehigh PA-Bucks PA-Chester PA-Northampton PA-
1147 PM EDT Thu Oct 31 2019
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 AM EDT FOR
EASTERN BERKS...MONTGOMERY...LEHIGH...NORTHWESTERN BUCKS...CHESTER
AND SOUTHWESTERN NORTHAMPTON COUNTIES...
At 1146 PM EDT, local law enforcement reported flash flooding in the
Allentown area. Several reports of street flooding have also been
received from Pottstown. Flash flooding will continue for the next
few hours.
Some locations that could experience flooding include...
Allentown, Reading, Easton, West Chester, Bethlehem, Norristown,
Pottstown, Phoenixville, Lansdale, West Norriton, East Norriton,
Coatesville, Emmaus, Northampton, Quakertown, Perkasie, Doylestown,
Byram, Wilson and Downingtown.
This includes Interstate 78 in Pennsylvania between mile markers 45
and 76.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3976 7606 3987 7599 3995 7600 4004 7593
4011 7594 4014 7588 4023 7601 4057 7575
4083 7541 4066 7519 4057 7519 4058 7512
4054 7507 4045 7507 4040 7504 3972 7582
3972 7613
$$
CMS434
WGUS71 KPHI 010518
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
118 AM EDT Fri Nov 1 2019
PAC011-017-029-077-091-095-010715-
/O.CON.KPHI.FF.W.0085.000000T0000Z-191101T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Montgomery PA-Lehigh PA-Bucks PA-Chester PA-Northampton PA-
118 AM EDT Fri Nov 1 2019
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 AM EDT FOR
EASTERN BERKS...MONTGOMERY...LEHIGH...NORTHWESTERN BUCKS...CHESTER
AND SOUTHWESTERN NORTHAMPTON COUNTIES...
At 116 AM EDT, local law enforcement reported flash flooding in
Allentown and Bethlehem. Additionally, several streams are rising
rapidly in western Bucks and western Montgomery Counties. Even
though the heaviest rainfall has ended, flash flooding will continue
for the next few hours.
Some locations that could experience flooding include...
Allentown, Reading, Easton, West Chester, Bethlehem, Norristown,
Pottstown, Phoenixville, Lansdale, West Norriton, East Norriton,
Coatesville, Emmaus, Northampton, Quakertown, Perkasie, Doylestown,
Byram, Wilson and Downingtown.
This includes Interstate 78 in Pennsylvania between mile markers 45
and 76.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3976 7606 3987 7599 3995 7600 4004 7593
4011 7594 4014 7588 4023 7601 4057 7575
4083 7541 4066 7519 4057 7519 4058 7512
4054 7507 4045 7507 4040 7504 3972 7582
3972 7613
$$
CMS674
WGUS71 KPHI 010622
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
222 AM EDT Fri Nov 1 2019
PAC011-017-029-077-091-095-010715-
/O.CON.KPHI.FF.W.0085.000000T0000Z-191101T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Montgomery PA-Lehigh PA-Bucks PA-Chester PA-Northampton PA-
222 AM EDT Fri Nov 1 2019
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 AM EDT FOR
EASTERN BERKS...MONTGOMERY...LEHIGH...NORTHWESTERN BUCKS...CHESTER
AND SOUTHWESTERN NORTHAMPTON COUNTIES...
At 219 AM EDT, automated gauges on the Perkiomen Creek in East
Greenville and the West Branch Brandywine Creek at Honey Brook
indicate levels have reached flood stage. Flash flooding is expected
to continue across the warned area.
Some locations that could experience flooding include...
Allentown, Reading, Easton, West Chester, Bethlehem, Norristown,
Pottstown, Phoenixville, Lansdale, West Norriton, East Norriton,
Coatesville, Emmaus, Northampton, Quakertown, Perkasie, Doylestown,
Byram, Wilson and Downingtown.
This includes Interstate 78 in Pennsylvania between mile markers 45
and 76.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3976 7606 3987 7599 3995 7600 4004 7593
4011 7594 4014 7588 4023 7601 4057 7575
4083 7541 4066 7519 4057 7519 4058 7512
4054 7507 4045 7507 4040 7504 3972 7582
3972 7613
$$
CMS217
WGUS71 KPHI 010707
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
307 AM EDT Fri Nov 1 2019
PAC011-017-029-077-091-095-010716-
/O.EXP.KPHI.FF.W.0085.000000T0000Z-191101T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Montgomery PA-Lehigh PA-Bucks PA-Chester PA-Northampton PA-
307 AM EDT Fri Nov 1 2019
...THE FLASH FLOOD WARNING FOR EASTERN BERKS...MONTGOMERY...LEHIGH...
NORTHWESTERN BUCKS...CHESTER AND SOUTHWESTERN NORTHAMPTON COUNTIES
WILL EXPIRE AT 315 AM EDT...
An areal flood warning has been issued for this area until 700 am.
Please continue to heed any road closures.
LAT...LON 3976 7606 3987 7599 3995 7600 4004 7593
4011 7594 4014 7588 4023 7601 4057 7575
4083 7541 4066 7519 4057 7519 4058 7512
4054 7507 4045 7507 4040 7504 3972 7582
3972 7613
$$
CMSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 31, 8:11 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh | 64 min |
| Oct 31, 8:58 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 62 min |
| Oct 31, 9:35 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 55 min |
| Oct 31, 9:41 PM EDT | Flash Flood Warning | PHI | Berks | 4 hr |
| Oct 31, 9:56 PM EDT | Areal Flood Advisory | PHI | Carbon, Monroe | 4 hr |
| Oct 31, 9:56 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 64 min |
| Oct 31, 10:23 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Montgomery | 67 min |
| Oct 31, 10:43 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 77 min |
| Oct 31, 10:45 PM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 4 hr |
| Oct 31, 11:14 PM EDT | Flash Flood Warning | PHI | Carbon, Monroe, Northampton | 4 hr |
| Oct 31, 11:15 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 60 min |
| Oct 31, 11:32 PM EDT | Tornado Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 14 min |
| Oct 31, 11:54 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 66 min |
| Oct 31, 11:54 PM EDT | Tornado Warning | PHI | Bucks | 36 min |
| Nov 1, 1:43 AM EDT | Areal Flood Warning | PHI | Berks | 4 hr |
| Nov 1, 2:28 AM EDT | River Flood Warning | PHI | Chester | 4 hr |
| Nov 1, 3:02 AM EDT | Areal Flood Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 5 hr |
| Nov 1, 3:06 AM EDT | Areal Flood Warning | PHI | Carbon, Monroe, Northampton | 4 hr |
| Nov 1, 3:31 AM EDT | Freeze Watch | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 6 hr |
| Nov 1, 9:12 AM EDT | Freeze Warning | PHI | Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 1 more | 25 hr |
| Nov 1, 3:16 PM EDT | Frost Advisory | PHI | Philadelphia | 19 hr |
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.