Alert archive / Pennsylvania / Flash Flood Warnings in 2006
Flash Flood Warning 67, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 29, 2006, 3:39 PM EDT for Chester 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 29, 2006, 3:39 PM EDT (19:39 UTC)
- Expired
- Aug 29, 2006, 6:30 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Counties, with a storm outline in the text
County Chester County, PA
The radar
The Philadelphia radar (KDIX), 119 km from the middle of the area, began a volume at 19:42 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
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.7 hours before the alert went out and 75 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
- 21 J/kg
- Mixed-layer CIN
- -132 J/kg
- Mixed-layer LCL
- 934 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 185 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS51 KPHI 291939 FFWPHI PAC029-292230- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 339 PM EDT TUE AUG 29 2006 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA * UNTIL 630 PM EDT * AT 337 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED TORRENTIAL RAIN FROM A THUNDERSTORM. DOPPLER RADAR PRECIPITATION ESTIMATES OF 2 TO 3 INCHES PER HOUR IS OCCURRING WITH THE THUNDERSTORM. THIS SAME THUNDERSTORM PRODUCED NEARLY 3 INCHES OF RAIN IN AN HOUR IN SOUTHEASTERN BERKS COUNTY, IN THE TOWN OF SHILLINGTON, WITH SIGNIFICANT STREET FLOODING REPORTED. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PHOENIXVILLE...HONEY BROOK AND ELVERSON A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. LAT...LON 4002 7595 4010 7547 4026 7568 4011 7594 $$ GORSE
2 follow-up statements
000 WGUS71 KPHI 292006 FFSPHI FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 404 PM EDT TUE AUG 29 2006 PAC029-292230- CHESTER PA- 405 PM EDT TUE AUG 29 2006 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM EDT FOR NORTHERN CHESTER COUNTY... AT 400 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO FOLLOW A TORRENTIAL RAIN PRODUCING THUNDERSTORM OVER THE WARNED AREA. SOME STREET, HIGHWAY AND POOR DRAINAGE FLOODING HAS BEEN REPORTED AROUND THE VALLEY FORGE AREA WITH RAINFALL RATES AROUND 2 INCHES PER HOUR. LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PHOENIXVILLE AND LIONVILLE. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. LAT...LON 3993 7554 4006 7539 4022 7563 4009 7585 $$ GORSE
000 WGUS71 KPHI 292125 FFSPHI FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 525 PM EDT TUE AUG 29 2006 PAC029-292230- CHESTER PA- 525 PM EDT TUE AUG 29 2006 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM EDT FOR NORTHERN CHESTER COUNTY... AT 520 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING ANOTHER CLUSTER OF SHOWERS AND THUNDERSTORMS MOVING ACROSS THE COUNTY. TORRENTIAL RAINFALL COUPLED WITH CONTINUED RUNOFF FROM THE EARLIER RAINFALL WILL RESULT IN AREAS OF FLASH FLOODING. THE VALLEY CREEK GAGE AT VALLEY FORGE IS EXPERIENCING A RAPID RISE WITH A STAGE AT 6.48 FEET AND RISING. FLOOD STAGE IS 7 FEET. THIS IS A POTENTIALLY DANGEROUS SITUATION. DO NOT DRIVE THROUGH FLOODED ROADS. IF YOU LIVE NEAR A STREAM OR CREEK, MOVE TO HIGHER GROUND NOW LAT...LON 3993 7554 4006 7539 4022 7563 4009 7585 $$ GORSE
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 29, 2:14 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 61 min |
| Aug 29, 2:42 PM EDT | Flash Flood Warning | PHI | Berks | 3 hr |
| Aug 29, 2:53 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Montgomery | 52 min |
| Aug 29, 3:37 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 68 min |
| Aug 29, 3:50 PM EDT | Flash Flood Warning | PHI | Montgomery | 3 hr |
| Aug 29, 4:15 PM EDT | Flash Flood Warning | PHI | Philadelphia | 3 hr |
| Aug 29, 5:43 PM EDT | Flash Flood Warning | PHI | Berks | 2 hr |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.