Alert archive / Pennsylvania / Flash Flood Warnings in 2019
Flash Flood Warning 45, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 11, 2019, 3:45 PM EDT for 5 counties in Pennsylvania. It was in force for 4 hr. 9 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
- Jul 11, 2019, 3:45 PM EDT (19:45 UTC)
- Expired
- Jul 11, 2019, 7:45 PM 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, 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 19:48 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 |
|---|---|---|---|
| Jul 11, 4:25 PM EDT | FLASH FLOOD | 1 Wsw Pennsburg, PA | THE PERKIOMEN CREEK AT EAST GREENVILLE EXCEEDED FLOOD STAGE OF 4 FEET. |
| Jul 11, 4:38 PM EDT | FLASH FLOOD | 2 Sw Upper Hanover Twp, PA | WATER RESCUE ON KUTZTOWN RD AT FOX HOLLOW LN. |
| Jul 11, 5:12 PM EDT | FLASH FLOOD | 1 Wnw Geryville, PA | WATER RESCUE ON WASSER RD AT RIDGE WAY. |
| Jul 11, 5:20 PM EDT | FLASH FLOOD | 1 S Hereford Twp, PA | NUMEROUS HOMES ON FETTERMAN ROAD FLOODED. |
| Jul 11, 5:20 PM EDT | FLASH FLOOD | 1 Ssw Hereford Twp, PA | MPING REPORT OF HOMES OR BUILDINGS TAKING ON WATER. |
| Jul 11, 5:20 PM EDT | FLASH FLOOD | Bally, PA | ROUTE 100 INTO BALLY IS IMPASSIBLE DUE TO FLOODING. |
| Jul 11, 5:35 PM EDT | FLASH FLOOD | 1 Wsw Geryville, PA | WATER RESCUE REPORTED ON QUAKERTOWN AVE. |
| Jul 11, 5:55 PM EDT | FLASH FLOOD | Pennsburg, PA | WATER RESCUE ON QUAKERTOWN AVE AT OTT RD. |
| Jul 11, 6:08 PM EDT | FLASH FLOOD | Pennsburg, PA | WATER RESCUE ON WASHINGTON ST NEAR 3RD ST. |
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, 7.8 hours before the alert went out and 212 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
- 93 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 911 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
529
WGUS51 KPHI 111945
FFWPHI
PAC011-017-077-091-095-112345-
/O.NEW.KPHI.FF.W.0045.190711T1945Z-190711T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
345 PM EDT Thu Jul 11 2019
The National Weather Service in Mount Holly NJ has issued a
* Flash Flood Warning for...
East central Berks County in eastern Pennsylvania...
North central Montgomery County in southeastern Pennsylvania...
Southeastern Lehigh County in eastern Pennsylvania...
Northwestern Bucks County in southeastern Pennsylvania...
Southwestern Northampton County in eastern Pennsylvania...
* Until 745 PM EDT.
* At 344 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Flash flooding is expected in
the areas of heaviest rain.
* Some locations that could experience flooding include...
Allentown, Easton, Bethlehem, Forks, Emmaus, Northampton, Wilson,
Hellertown, Nazareth, East Greenville, Bath, West Easton, Bally,
Steuben, Green Lane, Glendon, Zionsville, Ancient Oaks, Lehigh
University and Geryville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 4070 7520 4069 7520 4033 7547 4042 7567
4081 7540
$$
Kruzdlo2 follow-up statements
259
WGUS71 KPHI 112002
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
402 PM EDT Thu Jul 11 2019
PAC011-017-077-091-095-112345-
/O.CON.KPHI.FF.W.0045.000000T0000Z-190711T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Montgomery PA-Lehigh PA-Bucks PA-Northampton PA-
402 PM EDT Thu Jul 11 2019
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM EDT FOR
EAST CENTRAL BERKS...NORTH CENTRAL MONTGOMERY...SOUTHEASTERN
LEHIGH...NORTHWESTERN BUCKS AND SOUTHWESTERN NORTHAMPTON COUNTIES...
At 400 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across portions of the warned area. Over one inch of rain
fell in eighteen minutes at the Lehigh Valley International
Airport.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 4070 7520 4069 7520 4033 7547 4042 7567
4081 7540
$$
Kruzdlo408
WGUS71 KPHI 112341
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
741 PM EDT Thu Jul 11 2019
PAC011-017-077-091-095-112350-
/O.EXP.KPHI.FF.W.0045.000000T0000Z-190711T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Montgomery PA-Lehigh PA-Bucks PA-Northampton PA-
741 PM EDT Thu Jul 11 2019
...THE FLASH FLOOD WARNING FOR EAST CENTRAL BERKS...NORTH CENTRAL
MONTGOMERY...SOUTHEASTERN LEHIGH...NORTHWESTERN BUCKS AND
SOUTHWESTERN NORTHAMPTON COUNTIES WILL EXPIRE AT 745 PM EDT...
This flash flood warning will expire and be replaced with a smaller
separate flash flood warning.
LAT...LON 4070 7520 4069 7520 4033 7547 4042 7567
4081 7540
$$
KruzdloThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 3:44 AM EDT | Flash Flood Watch | PHI | Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 2 more | 18 hr |
| Jul 11, 12:33 PM EDT | Special Weather Statement | PHI | Chester | 57 min |
| Jul 11, 1:23 PM EDT | Special Weather Statement | PHI | Chester, Delaware | 52 min |
| Jul 11, 1:44 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Montgomery, Philadelphia | 61 min |
| Jul 11, 2:41 PM EDT | Special Weather Statement | PHI | Philadelphia | 64 min |
| Jul 11, 2:44 PM EDT | Special Weather Statement | PHI | Bucks, Montgomery | 61 min |
| Jul 11, 2:50 PM EDT | Areal Flood Advisory | PHI | Berks, Chester, Montgomery | 4 hr |
| Jul 11, 3:00 PM EDT | Flash Flood Warning | PHI | Berks, Chester, Montgomery | 8 hr |
| Jul 11, 3:13 PM EDT | Areal Flood Advisory | PHI | Bucks, Carbon, Lehigh, Monroe, Northampton | 4 hr |
| Jul 11, 3:33 PM EDT | Areal Flood Advisory | PHI | Northampton | 4 hr |
| Jul 11, 4:45 PM EDT | Flash Flood Warning | PHI | Berks, Montgomery | 4 hr |
| Jul 11, 5:12 PM EDT | Flash Flood Warning | PHI | Chester | 4 hr |
| Jul 11, 5:20 PM EDT | Flash Flood Warning | PHI | Bucks, Chester, Montgomery | 4 hr |
| Jul 11, 5:33 PM EDT | Areal Flood Advisory | PHI | Bucks | 4 hr |
| Jul 11, 6:14 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Montgomery, Philadelphia | 61 min |
| Jul 11, 6:15 PM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| Jul 11, 6:17 PM EDT | Areal Flood Advisory | PHI | Bucks | 4 hr |
| Jul 11, 6:28 PM EDT | River Flood Warning | PHI | Montgomery | 22 hr |
| Jul 11, 6:57 PM EDT | River Flood Warning | PHI | Montgomery | 12 hr |
| Jul 11, 7:03 PM EDT | River Flood Warning | PHI | Chester, Montgomery, Philadelphia | 26 hr |
| Jul 11, 7:19 PM EDT | River Flood Warning | PHI | Chester | 7 hr |
| Jul 11, 7:47 PM EDT | Flash Flood Warning | PHI | Berks, Bucks, Lehigh, Montgomery | 3 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.