Alert archive / Pennsylvania / Flash Flood Warnings in 2015
Flash Flood Warning 54, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 12, 2015, 4:55 PM EDT for 4 counties in Pennsylvania. It was in force for 2 hr. 1 report 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
- Sep 12, 2015, 4:55 PM EDT (20:55 UTC)
- Expired
- Sep 12, 2015, 7:00 PM EDT
- In force
- 2 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 131 km from the middle of the area, began a volume at 20:58 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 |
|---|---|---|---|
| Sep 12, 5:33 PM EDT | HEAVY RAIN 3.22 | Shankweilers, PA | 3 INCHES OF RAIN FELL IN AN HOUR FROM 417-518 PM |
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, 8.9 hours before the alert went out and 226 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
- 73 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 683 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
426
WGUS51 KPHI 122055
FFWPHI
PAC025-077-089-095-122300-
/O.NEW.KPHI.FF.W.0054.150912T2055Z-150912T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
455 PM EDT SAT SEP 12 2015
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
WEST CENTRAL NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
SOUTHWESTERN MONROE COUNTY IN NORTHEASTERN PENNSYLVANIA...
SOUTHEASTERN CARBON COUNTY IN NORTHEASTERN PENNSYLVANIA...
* UNTIL 700 PM EDT
* AT 453 PM EDT...DOPPLER RADAR AND AUTOMATED RAIN GAUGES INDICATED
A THUNDERSTORM PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. TWO
INCHES OF RAINFALL IS OCCURRING IN AN HOUR. UP TO THREE INCHES OF
RAIN HAVE ALREADY FALLEN TODAY. FLASH FLOODING IS EXPECTED TO
BEGIN SHORTLY.
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
ALLENTOWN...BETHLEHEM...EMMAUS...NORTHAMPTON...PALMERTON...
SLATINGTON...WIND GAP...BATH...WALNUTPORT...STORMVILLE...NEW
TRIPOLI...BEERSVILLE...DANIELSVILLE...ROSSLAND...CLAUSSVILLE...
BERLINSVILLE...BELTZVILLE STATE PARK...BRODHEADSVILLE...
SCHNECKSVILLE AND MCMICHAEL.
ADDITIONAL RAINFALL AMOUNTS AROUND AN INCH ARE POSSIBLE IN THE
WARNED AREA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.
TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.
&&
LAT...LON 4097 7523 4062 7543 4047 7557 4048 7558
4060 7577 4062 7579 4080 7571 4094 7563
4103 7549
$$
JRK2 follow-up statements
013
WGUS71 KPHI 122200
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
600 PM EDT SAT SEP 12 2015
PAC025-089-095-122206-
/O.CAN.KPHI.FF.W.0054.000000T0000Z-150912T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NORTHAMPTON PA-MONROE PA-CARBON PA-
600 PM EDT SAT SEP 12 2015
...THE FLASH FLOOD WARNING FOR WEST CENTRAL NORTHAMPTON...
SOUTHWESTERN MONROE AND SOUTHEASTERN CARBON COUNTIES IS CANCELLED...
THE HEAVY RAINFALL STAYED SOUTH OF THE AREA IN LEHIGH VALLEY.
THEREFORE...FLOODING IS NOT EXPECTED TO POSE A THREAT.
LAT...LON 4059 7575 4068 7573 4071 7570 4076 7563
4073 7559 4069 7555 4065 7552 4059 7552
4052 7561
$$
PAC077-122300-
/O.CON.KPHI.FF.W.0054.000000T0000Z-150912T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LEHIGH PA-
600 PM EDT SAT SEP 12 2015
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM EDT FOR
CENTRAL LEHIGH COUNTY...
AT 556 PM EDT...DOPPLER RADAR AND AUTOMATED RAIN GAUGES INDICATED
THAT HEAVY RAIN WAS FALLING OVER THE AREA. UP TO THREE INCHES OF
RAIN FELL IN LESS THAN TWO HOURS. SHOWERS HAVE ALREADY TAPERED OFF
BUT EXCESSIVE RUNOFF FROM THE EARLIER HEAVY RAIN MAY PRODUCE FLASH
FLOODING SHORTLY.
SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
ALLENTOWN...SLATINGTON...EMERALD...SCHNECKSVILLE...NEFFS...
COFFEETOWN...CLAUSSVILLE AND ANCIENT OAKS.
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 4059 7575 4068 7573 4071 7570 4076 7563
4073 7559 4069 7555 4065 7552 4059 7552
4052 7561
$$
JRK102
WGUS71 KPHI 122246
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
646 PM EDT SAT SEP 12 2015
PAC077-122256-
/O.CAN.KPHI.FF.W.0054.000000T0000Z-150912T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LEHIGH PA-
646 PM EDT SAT SEP 12 2015
...THE FLASH FLOOD WARNING FOR CENTRAL LEHIGH COUNTY IS CANCELLED...
THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO POSE
A THREAT.
LAT...LON 4059 7575 4068 7573 4071 7570 4076 7563
4073 7559 4069 7555 4065 7552 4059 7552
4052 7561
$$
JRKThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 12, 3:14 PM EDT | Areal Flood Advisory | PHI | Berks, Lehigh | 3 hr |
| Sep 12, 4:48 PM EDT | Special Weather Statement | PHI | Lehigh, Monroe, Northampton | 42 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2015Every flash flood warning in 2015
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.