Alert archive / Pennsylvania / Flash Flood Warnings in 2009
Flash Flood Warning 43, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 12, 2009, 11:23 PM EDT for Berks County, Lehigh County, Northampton County, Pennsylvania. It was in force for 7 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 12, 2009, 11:23 PM EDT (03:23 UTC)
- Expired
- Aug 13, 2009, 6:12 AM EDT
- In force
- 7 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), 125 km from the middle of the area, began a volume at 03:26 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, 3.4 hours before the alert went out and 223 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
- 136 J/kg
- Mixed-layer CIN
- -72 J/kg
- Mixed-layer LCL
- 544 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 70 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.4
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS51 KPHI 130323
FFWPHI
PAC011-077-095-130715-
/O.NEW.KPHI.FF.W.0043.090813T0323Z-090813T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1123 PM EDT WED AUG 12 2009
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 315 AM EDT
* AT 1118 PM EDT...NATIONAL WEATHER SERVICE RADAR INDICATED FLASH
FLOODING FROM CONTINUING THUNDERSTORMS OVER THE WARNED AREA. RADAR
ESTIMATED BETWEEN 2 AND 3 INCHES OF RAIN HAD FALLEN DURING THE
PAST HOUR.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
BEERSVILLE...WIND GAP...NORTHAMPTON...NAZARETH AND BATH
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.
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.
IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.
&&
LAT...LON 4068 7551 4079 7558 4084 7535 4088 7522
4064 7535 4038 7565 4064 7590
$$2 follow-up statements
000
WGUS51 KPHI 130705
FFWPHI
PAC011-077-095-131115-
/O.EXT.KPHI.FF.W.0043.000000T0000Z-090813T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
305 AM EDT THU AUG 13 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE
* FLASH FLOOD WARNING FOR...
NORTHEASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
THIS INCLUDES THE CITY OF ALLENTOWN...
WESTERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
* UNTIL 715 AM EDT
* AT 304 AM EDT...RAINS AND AREAS OF FLOODING CONTINUE ACROSS THE
WARNED AREA.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
BEERSVILLE...WIND GAP...NAZARETH AND BATH
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.
&&
LAT...LON 4068 7551 4079 7558 4084 7535 4088 7522
4064 7535 4038 7565 4064 7590
$$
PO000
WGUS71 KPHI 131012
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
612 AM EDT THU AUG 13 2009
PAC011-077-095-131022-
/O.CAN.KPHI.FF.W.0043.000000T0000Z-090813T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BERKS PA-LEHIGH PA-NORTHAMPTON PA-
612 AM EDT THU AUG 13 2009
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WESTERN
NORTHAMPTON...LEHIGH AND NORTHEASTERN BERKS COUNTIES...
THE THREAT OF HEAVY RAINS HAS PASSED. AREAS STREAMS AND CREEKS MAY
CONTINUE TO RUN HIGH THROUGH THE MORNING.
LAT...LON 4068 7551 4079 7558 4084 7535 4088 7522
4064 7535 4038 7565 4064 7590
$$
POThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 8:54 PM EDT | Flash Flood Warning | PHI | Carbon | 4 hr |
| Aug 12, 10:33 PM EDT | Flash Flood Warning | PHI | Carbon, Lehigh, Northampton | 4 hr |
| Aug 12, 10:42 PM EDT | Flash Flood Warning | PHI | Berks | 4 hr |
| Aug 13, 2:58 AM EDT | Areal Flood Advisory | PHI | Chester | 3 hr |
| Aug 13, 3:36 AM EDT | Flood Watch | PHI | Berks, Carbon, Delaware, Lehigh, Monroe, Northampton and 1 more | 36 min |
| Aug 13, 4:12 AM EDT | Flash Flood Watch | PHI | Berks, Carbon, Delaware, Lehigh, Monroe, Northampton and 1 more | 15 hr |
| Aug 13, 6:01 AM EDT | River Flood Warning | PHI | Chester | 5 hr |
| Aug 13, 9:13 AM EDT | River Flood Warning | PHI | Chester, Delaware | 5 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2009Every flash flood warning in 2009
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.