Alert archive / Pennsylvania / Flash Flood Warnings in 2020
Flash Flood Warning 38, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 4, 2020, 9:38 AM EDT for Monroe County, Northampton County, Pennsylvania. It was in force for 4 hr. 13 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 4, 2020, 9:38 AM EDT (13:38 UTC)
- Expired
- Aug 4, 2020, 1:30 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Monroe County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 119 km from the middle of the area, began a volume at 13:42 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 4, 12:06 PM EDT | FLASH FLOOD | 2 Sse Tatamy, PA | FLOODING ON ZUCKSVILLE ROAD NEAR BUSHKILL DRIVE. TIME BASED ON DISPATCH REPORT. |
| Aug 4, 12:11 PM EDT | FLASH FLOOD | 1 E Nazareth, PA | FLOODING ON TATAMY ROAD NEAR FRIENDENSTHAL AVENUE. TIME BASED ON DISPATCH REPORT. |
| Aug 4, 12:15 PM EDT | HEAVY RAIN 2.1 | 1 N Pocono Summit, PA | ASOS STATION KMPO MT. POCONO. |
| Aug 4, 12:21 PM EDT | FLASH FLOOD | 2 Ene Bethlehem Twp, PA | FLASH FLOODING CLOSED FARMERSVILLE ROAD NEAR EASTON AVENUE. TIME BASED ON DISPATCH REPORT. |
| Aug 4, 12:30 PM EDT | FLASH FLOOD | Easton, PA | FLOODING AT BLUE RESTAURANT IN EASTON PA, WITH NUMEROUS ROADS IN THE AREA FLOODED. RAIN TOTALS NEAR 6-7INCHES. |
| Aug 4, 12:36 PM EDT | HEAVY RAIN 3.86 | 2 Nne Sciota, PA | MESONET STATION DW4714 SNYDERSVILLE. |
| Aug 4, 12:40 PM EDT | HEAVY RAIN 2.68 | 2 Nne Long Pond, PA | MESONET STATION EW6499 POCONO PINES. |
| Aug 4, 12:40 PM EDT | HEAVY RAIN 5.36 | 1 Ene Saylorsburg, PA | MESONET STATION DW3072 SAYLORSBURG. |
| Aug 4, 12:50 PM EDT | HEAVY RAIN 2.85 | 1 Ssw Skytop, PA | MESONET STATION 7260D SKYTOP. |
| Aug 4, 1:00 PM EDT | FLASH FLOOD | 1 Nne Bossardsville, PA | FLASH FLOODING CLOSED CHERRY VALLEY ROAD NEAR GOODALE ROAD. TIME BASED ON A COMBINATION OF SOCIAL MEDIA AND DISPATCH REPORTS. |
| Aug 4, 1:17 PM EDT | HEAVY RAIN 5.2 | Arlington Heights, PA | 5.2 INCHES OF RAIN SO FAR. |
| Aug 4, 1:30 PM EDT | FLASH FLOOD | 1 Nnw Sciota, PA | FLASH FLOODING ON APPENZELL CREEK DAMAGED A PORT OF PENNSYLVANIA CREEK ROAD. TIME ESTIMATED BASED ON DISPATCH REPORTS. |
| Aug 4, 1:39 PM EDT | FLASH FLOOD | 2 Nw Bath, PA | FLOODING CLOSED GROUSE DRIVE NEAR WHITETAIL DEER DRIVE. 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, 1.6 hours before the alert went out and 202 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
- 1593 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 570 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 150 m²/s²
- 0-3 km storm-relative helicity
- 245 m²/s²
- Significant tornado parameter
- 1.5
- Supercell composite
- 7.4
The text
As transmitted.
585
WGUS51 KPHI 041338
FFWPHI
PAC089-095-041730-
/O.NEW.KPHI.FF.W.0038.200804T1338Z-200804T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
938 AM EDT Tue Aug 4 2020
The National Weather Service in Mount Holly NJ has issued a
* Flash Flood Warning for...
Central Monroe County in northeastern Pennsylvania...
Central Northampton County in eastern Pennsylvania...
* Until 130 PM EDT.
* At 935 AM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to three inches of rain have
already fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
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 could experience flooding include...
Easton, Mount Pocono, Bethlehem, Forks, Tobyhanna, Wilson,
Nazareth, Bangor, Pen Argyl, Wind Gap, Bath, Belfast, West Easton,
Tatamy, East Bangor, Steuben, Glendon, Stormville, Pocono Pines and
Skytop.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.
&&
LAT...LON 4072 7518 4070 7520 4068 7520 4067 7518
4065 7520 4065 7541 4067 7543 4123 7548
4125 7522
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...2-3 INCHES IN 1 HOUR
$$
Kruzdlo1 follow-up statement
528
WGUS71 KPHI 041728
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
128 PM EDT Tue Aug 4 2020
PAC089-095-041734-
/O.EXP.KPHI.FF.W.0038.000000T0000Z-200804T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe PA-Northampton PA-
128 PM EDT Tue Aug 4 2020
...THE FLASH FLOOD WARNING FOR CENTRAL MONROE AND CENTRAL NORTHAMPTON
COUNTIES WILL EXPIRE AT 130 PM EDT...
This Flash Flood Warning will be allowed to expire. Southern
portions of this warning have been replaced by another Flash Flood
Warning. The northern portion has been replaced by a Flood Advisory.
LAT...LON 4072 7518 4070 7520 4068 7520 4067 7518
4065 7520 4065 7541 4067 7543 4123 7548
4125 7522
$$
KruzdloThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 5:17 AM EDT | Areal Flood Advisory | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| Aug 4, 7:23 AM EDT | Tornado Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 20 min |
| Aug 4, 7:28 AM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery | 3 hr |
| Aug 4, 8:11 AM EDT | Flash Flood Warning | PHI | Bucks, Lehigh, Montgomery, Northampton | 4 hr |
| Aug 4, 8:19 AM EDT | River Flood Warning | PHI | Delaware | 15 hr |
| Aug 4, 8:19 AM EDT | Tornado Warning | PHI | Bucks | 26 min |
| Aug 4, 9:23 AM EDT | Tornado Warning | PHI | Chester | 22 min |
| Aug 4, 9:29 AM EDT | Tornado Warning | PHI | Monroe, Northampton | 31 min |
| Aug 4, 9:58 AM EDT | Tornado Warning | PHI | Monroe | 16 min |
| Aug 4, 10:02 AM EDT | Flash Flood Warning | PHI | Chester, Delaware | 4 hr |
| Aug 4, 10:20 AM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| Aug 4, 10:51 AM EDT | Tornado Warning | PHI | Montgomery | 24 min |
| Aug 4, 11:01 AM EDT | Flash Flood Warning | PHI | Bucks | 4 hr |
| Aug 4, 11:13 AM EDT | Areal Flood Advisory | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 4 hr |
| Aug 4, 11:43 AM EDT | Flash Flood Warning | PHI | Berks, Lehigh, Northampton | 4 hr |
| Aug 4, 12:06 PM EDT | River Flood Warning | PHI | Chester | 11 hr |
| Aug 4, 12:37 PM EDT | River Flood Warning | PHI | Montgomery | 14 hr |
| Aug 4, 12:48 PM EDT | River Flood Warning | PHI | Chester, Delaware | 24 hr |
| Aug 4, 1:01 PM EDT | River Flood Warning | PHI | Bucks | 18 hr |
| Aug 4, 1:12 PM EDT | River Flood Warning | PHI | Berks | 10 hr |
| Aug 4, 1:12 PM EDT | River Flood Warning | PHI | Montgomery | 26 hr |
| Aug 4, 1:12 PM EDT | River Flood Warning | PHI | Chester, Montgomery, Philadelphia | 43 hr |
| Aug 4, 1:12 PM EDT | River Flood Warning | PHI | Montgomery, Philadelphia | 35 hr |
| Aug 4, 1:59 PM EDT | Areal Flood Warning | PHI | Chester, Delaware | 9 hr |
| Aug 4, 2:09 PM EDT | Areal Flood Warning | PHI | Berks, Chester, Delaware, Montgomery, Philadelphia | 15 hr |
| Aug 4, 2:23 PM EDT | River Flood Warning | PHI | Lehigh | 16 hr |
| Aug 4, 2:47 PM EDT | Areal Flood Warning | PHI | Bucks | 9 hr |
| Aug 4, 3:42 PM EDT | Areal Flood Warning | PHI | Lehigh, Northampton | 4 hr |
| Aug 4, 4:39 PM EDT | River Flood Warning | PHI | Monroe | 6 hr |
| Aug 4, 7:29 PM EDT | Areal Flood Warning | PHI | Lehigh, Northampton | 12 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2020Every flash flood warning in 2020
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.