Alert archive / Pennsylvania / Flash Flood Warnings in 2011
Flash Flood Warning 17, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 7, 2011, 2:29 AM EDT for Berks County, Lehigh County, Northampton County, Pennsylvania. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 7, 2011, 2:29 AM EDT (06:29 UTC)
- Expired
- Aug 7, 2011, 5:22 AM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Berks County, PA, Lehigh County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 131 km from the middle of the area, began a volume at 06:29 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.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 6.5 hours before the alert went out and 236 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
- 5 J/kg
- Mixed-layer CIN
- -208 J/kg
- Mixed-layer LCL
- 889 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 174 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
185
WGUS51 KPHI 070629
FFWPHI
PAC011-077-095-071030-
/O.NEW.KPHI.FF.W.0017.110807T0629Z-110807T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
229 AM EDT SUN AUG 7 2011
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHEASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
THIS INCLUDES THE CITY OF ALLENTOWN...
WESTERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
* UNTIL 630 AM EDT
* AT 224 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA. AS MUCH AS
3 AND ONE-HALF INCHES OF RAIN HAS FALLEN IN THE AREA...AND ANOTHER
INCH OR SO IS POSSIBLE. THE ADDITIONAL RAIN COULD PUSH CREEKS AND
STREAMS OUT OF THEIR BANKS. IN ADDITION...EXPECT STREET FLOODING AND
FLOODING OF LOW LYING AREAS.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
WANAMAKERS...NEW TRIPOLI...NEFFS...JORDAN VALLEY...EMERALD...
COFFEETOWN...BEERSVILLE...WALNUTPORT...SLATINGTON...
SCHNECKSVILLE...NORTHAMPTON...BETHLEHEM AND BATH
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.
&&
LAT...LON 4063 7598 4080 7558 4082 7546 4066 7531
4056 7553 4043 7573
$$
HAYES2 follow-up statements
532
WGUS71 KPHI 070826
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
426 AM EDT SUN AUG 7 2011
PAC011-077-095-071030-
/O.CON.KPHI.FF.W.0017.000000T0000Z-110807T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BERKS PA-LEHIGH PA-NORTHAMPTON PA-
426 AM EDT SUN AUG 7 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 AM EDT FOR
WESTERN NORTHAMPTON...LEHIGH AND NORTHEASTERN BERKS COUNTIES...
AT 424 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THAT THE HEAVIEST RAIN WAS ABOUT TO MOVE OUT OF THE WARNED AREA.
ALMOST 7 INCHES OF RAIN HAS FALLEN IN THE WALNUTPORT AREA...AND
CREEKS AND STREAMS ARE STILL RISING IN THE AREA.
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WANAMAKERS...
NEW TRIPOLI...NEFFS...JORDAN VALLEY...EMERALD...BEERSVILLE...
WALNUTPORT...SLATINGTON...SCHNECKSVILLE...NORTHAMPTON AND BATH
LAT...LON 4063 7598 4080 7558 4082 7546 4066 7531
4056 7553 4043 7573
$$
HAYES578
WGUS71 KPHI 070922
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
522 AM EDT SUN AUG 7 2011
PAC011-077-095-070932-
/O.CAN.KPHI.FF.W.0017.000000T0000Z-110807T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BERKS PA-LEHIGH PA-NORTHAMPTON PA-
522 AM EDT SUN AUG 7 2011
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WESTERN
NORTHAMPTON...LEHIGH AND NORTHEASTERN BERKS COUNTIES...
THE HEAVIEST RAIN HAS MOVED OUT OF THE AREA.
LAT...LON 4063 7598 4080 7558 4082 7546 4066 7531
4056 7553 4043 7573
$$
HAYESThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 8:49 PM EDT | Flood Watch | PHI | Carbon, Monroe | 9 hr |
| Aug 6, 10:06 PM EDT | Special Weather Statement | PHI | Berks | 84 min |
| Aug 6, 10:14 PM EDT | Special Weather Statement | PHI | Pike | 61 min |
| Aug 6, 10:33 PM EDT | Areal Flood Advisory | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 6 hr |
| Aug 7, 12:48 AM EDT | Special Weather Statement | PHI | Montgomery | 57 min |
| Aug 7, 1:32 AM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Chester, Montgomery, Northampton | 3 hr |
| Aug 7, 6:03 AM EDT | Flash Flood Watch | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 14 hr |
| Aug 7, 3:07 PM EDT | Special Weather Statement | PHI | Philadelphia | 23 min |
| Aug 7, 3:48 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 27 min |
| Aug 7, 7:20 PM EDT | Special Weather Statement | PHI | Monroe | 40 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2011Every flash flood warning in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.