Alert archive / Pennsylvania / Flash Flood Warnings in 2006
Flash Flood Warning 51, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 21, 2006, 9:32 PM EDT for 4 counties in Pennsylvania. It was in force for 3 hr. 3 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 21, 2006, 9:32 PM EDT (01:32 UTC)
- Expired
- Jul 22, 2006, 12:30 AM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Counties, with a storm outline in the text
Counties Berks County, PA, Bucks County, PA, Lehigh County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 120 km from the middle of the area, began a volume at 01:32 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 |
|---|---|---|---|
| Jul 21, 10:15 PM EDT | FLASH FLOOD | Kutztown, PA | SAUCONY CREEK OUT OF BANKS. 3.72 INCHES OR RAIN IN 90 MINUTES FROM A SPOTTER IN FLEETWOOD. |
| Jul 21, 10:30 PM EDT | FLASH FLOOD | Doylestown, PA | NUMEROUS ROADS FLOODED CENTRAL PART OF COUNTY. |
| Jul 21, 11:25 PM EDT | HEAVY RAIN 0 | Doylestown, PA | 2.28 INCHES OF RAIN IN 90 MINUTES. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 1.5 hours before the alert went out and 219 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
- 1388 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 999 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS51 KPHI 220134
FFWPHI
PAC011-017-077-095-220430-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
932 PM EDT FRI JUL 21 2006
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
BERKS COUNTY IN EASTERN PENNSYLVANIA
LEHIGH COUNTY IN EASTERN PENNSYLVANIA
THIS INCLUDES THE CITY OF ALLENTOWN
SOUTH CENTRAL NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA
THIS INCLUDES THE CITY OF BETHLEHEM
BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA
* UNTIL 1230 AM EDT
* AT 927 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
FLASH FLOODING FROM NUMEROUS THUNDERSTORMS OVER THE WARNED AREA.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO OLD
ORCHARD...NORTHAMPTON...LENHARTSVILLE...KUTZTOWN...HELLERTOWN...
HAMBURG...EMMAUS AND ANCIENT OAKS
A WEATHER SPOTTER IN CATASAUQUA...NEAR ALLENTOWN...REPORTED 2.8
INCHES OF RAIN IN LESS THAN ONE HOUR. STREET FLOODING WAS ALSO
REPORTED.
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.
LAT...LON 4049 7640 4030 7610 4042 7552 4022 7516
4026 7491 4074 7531
$$
AMC1 follow-up statement
000
WGUS71 KPHI 220317
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1111 PM EDT FRI JUL 21 2006
PAC095-220321-
NORTHAMPTON PA-
1115 PM EDT FRI JUL 21 2006
...THE FLASH FLOOD WARNING FOR NORTHAMPTON COUNTY IS CANCELLED...
LAT...LON 4049 7640 4016 7591 4042 7552 4009 7493
4017 7474 4067 7555
$$
PAC011-017-077-220430-
BERKS PA-LEHIGH PA-BUCKS PA-
1115 PM EDT FRI JUL 21 2006
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT FOR
BUCKS...SOUTHERN LEHIGH AND BERKS COUNTIES...
MORE RAIN IS EXPECTED OVER THE WARNED AREAS DURING THE NEXT HOUR.
AT 1108 PM EDT...TRAINED WEATHER SPOTTERS REPORTED THAT THE SACONY
CREEK IN NORTHERN BERKS COUNTY WAS RISING RAPIDLY. NUMEROUS ROADS IN
THE AREA WERE ALSO REPORTED TO BE FLOODING.
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
STRAUSSTOWN...QUAKERTOWN...LENHARTSVILLE...LEESPORT...KUTZTOWN...
HAMBURG...FLEETWOOD...EMMAUS...BERNVILLE...ANCIENT OAKS AND
ALLENTOWN.
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.
LAT...LON 4049 7640 4016 7591 4042 7552 4009 7493
4017 7474 4067 7555
$$
AMCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 10:14 PM EDT | Flash Flood Warning | PHI | Montgomery | 2 hr |
| Jul 22, 12:11 AM EDT | Flash Flood Warning | PHI | Berks, Bucks, Lehigh | 4 hr |
| Jul 22, 3:25 PM EDT | Flash Flood Warning | PHI | Montgomery | 3 hr |
| Jul 22, 3:37 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 53 min |
| Jul 22, 3:42 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 57 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2006Every flash flood warning in 2006
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.