Alert archive / Pennsylvania / Flash Flood Warnings in 2018
Flash Flood Warning 29, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 4, 2018, 3:22 PM EDT for Lehigh County, Northampton County, Pennsylvania. It was in force for 4 hr. 2 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 4, 2018, 3:22 PM EDT (19:22 UTC)
- Expired
- Jul 4, 2018, 7:15 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Lehigh County, PA, Northampton County, PA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 4, 4:03 PM EDT | HEAVY RAIN 3.04 | Orefield, PA | 3.04 INCHES OF RAIN FELL IN 60 MINUTES. |
| Jul 4, 4:14 PM EDT | FLASH FLOOD | Shankweilers, PA | REPORT OF A MUDSLIDE BLOCKING ONE LANE OF I-476 SOUTHBOUND AT MILE MARKER 62 |
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, 7.4 hours before the alert went out and 233 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
- 145 J/kg
- Mixed-layer CIN
- -205 J/kg
- Mixed-layer LCL
- 1091 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
271
WGUS51 KPHI 041922
FFWPHI
PAC077-095-042315-
/O.NEW.KPHI.FF.W.0029.180704T1922Z-180704T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
322 PM EDT WED JUL 4 2018
The National Weather Service in Mount Holly NJ has issued a
* Flash Flood Warning for...
Central Lehigh County in eastern Pennsylvania...
West central Northampton County in eastern Pennsylvania...
* Until 715 PM EDT.
* At 321 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Up to
one and a half inches of rain has already fallen in as little as
twenty minutes. Flash flooding is expected to begin shortly in the
areas of heaviest rain.
* Some locations that could experience flooding include...
Allentown, Bethlehem, Northampton, Slatington, Walnutport, Neffs,
Coffeetown, New Tripoli, Jordan Valley, Beersville, Emerald,
Schnecksville, Claussville, Catasauqua, Coplay, North Catasauqua,
Fullerton and Hokendauqua.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Please report flooding to your local law enforcement agency when you
can do so safely.
&&
LAT...LON 4076 7569 4076 7542 4062 7542 4055 7557
4056 7570 4062 7580
$$
CMS2 follow-up statements
856
WGUS71 KPHI 042100
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
500 PM EDT WED JUL 4 2018
PAC077-095-042315-
/O.CON.KPHI.FF.W.0029.000000T0000Z-180704T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lehigh PA-Northampton PA-
500 PM EDT WED JUL 4 2018
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 PM EDT FOR
CENTRAL LEHIGH AND WEST CENTRAL NORTHAMPTON COUNTIES...
At 459 PM EDT, gauge reports indicated thunderstorms produced up to
three inches of rain in the past couple of hours. A mudslide was
reported on Interstate 476 as a result of the heavy rainfall. Though
the heaviest rainfall is beginning to diminish, runoff will continue
to cause problems for the next couple of hours.
Some locations that could experience flooding include...
Allentown, Bethlehem, Northampton, Slatington, Walnutport, Neffs,
Coffeetown, New Tripoli, Jordan Valley, Beersville, Emerald,
Schnecksville, Claussville, Catasauqua, Coplay, North Catasauqua,
Fullerton and Hokendauqua.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Please report flooding to your local law enforcement agency when you
can do so safely.
&&
LAT...LON 4076 7569 4076 7542 4062 7542 4055 7557
4056 7570 4062 7580
$$
CMS981
WGUS71 KPHI 042309
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
709 PM EDT WED JUL 4 2018
PAC077-095-042318-
/O.EXP.KPHI.FF.W.0029.000000T0000Z-180704T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lehigh PA-Northampton PA-
709 PM EDT WED JUL 4 2018
...THE FLASH FLOOD WARNING FOR CENTRAL LEHIGH AND WEST CENTRAL
NORTHAMPTON COUNTIES WILL EXPIRE AT 715 PM EDT...
The heaviest ran has ended. However, residual runoff issues remain.
A flood advisory will be issued to replace the flash flood warning
shortly. Please continue to heed any remaining road closures.
LAT...LON 4076 7569 4076 7542 4062 7542 4055 7557
4056 7570 4062 7580
$$
CMSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 9:33 AM EDT | Areal Flood Advisory | PHI | Carbon, Monroe | 98 min |
| Jul 4, 2:55 PM EDT | Special Weather Statement | PHI | Lehigh | 35 min |
| Jul 4, 3:09 PM EDT | Areal Flood Advisory | PHI | Lehigh, Northampton | 4 hr |
| Jul 4, 3:32 PM EDT | Special Weather Statement | PHI | Lehigh, Northampton | 28 min |
| Jul 4, 3:40 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Northampton | 50 min |
| Jul 4, 3:56 PM EDT | Special Weather Statement | PHI | Lebanon | 34 min |
| Jul 4, 3:59 PM EDT | Areal Flood Advisory | PHI | Lehigh, Northampton | 4 hr |
| Jul 4, 4:20 PM EDT | Special Weather Statement | PHI | Carbon | 25 min |
| Jul 4, 4:25 PM EDT | Areal Flood Advisory | PHI | Berks, Lehigh | 4 hr |
| Jul 4, 4:28 PM EDT | Areal Flood Advisory | PHI | Carbon, Lehigh, Monroe, Northampton | 4 hr |
| Jul 4, 4:28 PM EDT | Special Weather Statement | PHI | Lehigh, Northampton | 32 min |
| Jul 4, 4:34 PM EDT | Special Weather Statement | PHI | Berks | 56 min |
| Jul 4, 4:56 PM EDT | Special Weather Statement | PHI | Carbon | 49 min |
| Jul 4, 5:46 PM EDT | Special Weather Statement | PHI | Berks | 29 min |
| Jul 4, 6:13 PM EDT | Special Weather Statement | PHI | Bucks, Montgomery | 32 min |
| Jul 4, 6:15 PM EDT | Special Weather Statement | PHI | Berks | 45 min |
| Jul 4, 6:20 PM EDT | Flash Flood Warning | PHI | Berks | 4 hr |
| Jul 4, 6:32 PM EDT | Special Weather Statement | PHI | Chester | 28 min |
| Jul 4, 7:00 PM EDT | Special Weather Statement | PHI | Delaware, Montgomery, Philadelphia | 30 min |
| Jul 4, 7:07 PM EDT | Special Weather Statement | PHI | Lebanon | 23 min |
| Jul 4, 7:13 PM EDT | Areal Flood Advisory | PHI | Lehigh, Northampton | 3 hr |
| Jul 4, 7:18 PM EDT | Areal Flood Advisory | PHI | Berks, Chester, Delaware, Montgomery, Philadelphia | 3 hr |
| Jul 4, 7:32 PM EDT | Special Weather Statement | PHI | Montgomery | 43 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2018Every flash flood warning in 2018
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.