Alert archive / Pennsylvania / Flash Flood Warnings in 2009
Flash Flood Warning 54, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 22, 2009, 6:21 PM EDT for Bucks County, Northampton County, Pennsylvania; Hunterdon County, Warren County, New Jersey. 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 22, 2009, 6:21 PM EDT (22:21 UTC)
- Expired
- Aug 22, 2009, 9:47 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Hunterdon County, NJ, Warren County, NJ, Bucks County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 89 km from the middle of the area, began a volume at 22:24 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 12:00Z, 10.4 hours before the alert went out and 196 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
- 1060 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 620 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS51 KPHI 222221
FFWPHI
NJC019-041-PAC017-095-230215-
/O.NEW.KPHI.FF.W.0054.090822T2221Z-090823T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
621 PM EDT SAT AUG 22 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
THIS INCLUDES THE CITY OF EASTON...
WESTERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
WESTERN WARREN COUNTY IN NORTHWEST NEW JERSEY...
BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 1015 PM EDT
* AT 617 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN IN VARIOUS PORTIONS OF THE WARNED AREA...WITH 1
INCH OF RAIN POSSIBLE IN A VERY SHORT PERIOD OF TIME.
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.
DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...DIPS...OR LOW WATER
CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.
&&
LAT...LON 4105 7496 4034 7488 4034 7493 4032 7493
4030 7488 4018 7486 4016 7500 4040 7541
4050 7541 4054 7535 4058 7541 4061 7539
4065 7542 4078 7543
$$
JJM1 follow-up statement
000
WGUS71 KPHI 230147
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
947 PM EDT SAT AUG 22 2009
NJC019-041-PAC017-095-230155-
/O.CAN.KPHI.FF.W.0054.000000T0000Z-090823T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WARREN NJ-HUNTERDON NJ-NORTHAMPTON PA-BUCKS PA-
947 PM EDT SAT AUG 22 2009
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR BUCKS...
NORTHAMPTON...WESTERN HUNTERDON AND WESTERN WARREN COUNTIES...
WHILE SHOWERS ARE STILL EXPECTED OVERNIGHT...MOST OF THE HEAVY RAIN
IS NOW OVER. THE FLASH FLOOD HAS THEREFORE BEEN CANCELLED.
LAT...LON 4105 7496 4034 7488 4034 7493 4032 7493
4030 7488 4018 7486 4016 7500 4040 7541
4050 7541 4054 7535 4058 7541 4061 7539
4065 7542 4078 7543
$$
JJMThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 10:14 PM EDT | Areal Flood Advisory | PHI | Chester | 3 hr |
| Aug 21, 10:49 PM EDT | Flash Flood Warning | PHI | Chester | 55 min |
| Aug 22, 1:40 AM EDT | Areal Flood Advisory | PHI | Bucks, Montgomery, Philadelphia | 3 hr |
| Aug 22, 1:51 AM EDT | Flash Flood Warning | PHI | Montgomery, Philadelphia | 77 min |
| Aug 22, 6:03 AM EDT | Flash Flood Warning | PHI | Montgomery, Philadelphia | 3 hr |
| Aug 22, 7:00 PM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| Aug 22, 1:28 AM EDT | Flash Flood Warning | PHI | Camden, Cumberland, Gloucester, Salem | 4 hr |
| Aug 22, 3:36 AM EDT | Flash Flood Warning | PHI | Somerset | 4 hr |
| Aug 22, 4:26 AM EDT | Areal Flood Advisory | PHI | Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem | 6 hr |
| Aug 22, 5:42 AM EDT | Areal Flood Advisory | PHI | Camden, Cumberland, Gloucester, Salem | 3 hr |
| Aug 22, 9:01 AM EDT | Areal Flood Advisory | PHI | Atlantic, Cape May, Cumberland | 3 hr |
| Aug 22, 6:02 PM EDT | Flash Flood Warning | PHI | Mercer | 4 hr |
| Aug 22, 6:32 PM EDT | Flash Flood Warning | PHI | Camden, Gloucester | 3 hr |
| Aug 22, 7:32 PM EDT | River Flood Warning | PHI | Mercer | 19 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2009Flash Flood Warnings in New Jersey, 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.