Alert archive / Pennsylvania / Flash Flood Warnings in 2015
Flash Flood Warning 30, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 6, 2015, 7:55 PM EDT for Chester County, Delaware County, Pennsylvania. It was in force for 4 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
- Jul 6, 2015, 7:55 PM EDT (23:55 UTC)
- Expired
- Jul 7, 2015, 12:00 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Chester County, PA, Delaware County, PA
The radar
The Philadelphia radar (KDIX), 87 km from the middle of the area, began a volume at 23:58 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.9 hours before the alert went out and 202 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
- 349 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 648 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
204
WGUS51 KPHI 062355
FFWPHI
PAC029-045-070400-
/O.NEW.KPHI.FF.W.0030.150706T2355Z-150707T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
755 PM EDT MON JUL 6 2015
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL DELAWARE COUNTY IN SOUTHEASTERN PENNSYLVANIA...
EAST CENTRAL CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
* UNTIL MIDNIGHT EDT
* AT 754 PM EDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
HEAVY RAIN ACROSS THE WARNED AREA. UP TO ONE AND A HALF INCHES OF
RAIN HAS ALREADY FALLEN WITH AN ADDITIONAL INCH OR MORE POSSIBLE.
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
LIMA...CONCORDVILLE...CHELSEA...GRADYVILLE...TROUT LAKE...ELAM...
NEWTOWN SQUARE...CHEYNEY...BROOMALL...PAOLI...CHESTER TOWNSHIP...
NETHER PROVIDENCE TOWNSHIP...RADNOR TOWNSHIP...BROOKHAVEN...
MEDIA...CHESTER HEIGHTS...ROSE VALLEY...BOOTHWYN...VILLAGE
GREEN-GREEN RIDGE AND UPPER PROVIDENCE TOWNSHIP.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.
&&
LAT...LON 4000 7534 3982 7543 3986 7557 4004 7549
$$
ROBERTSON2 follow-up statements
043 WGUS71 KPHI 070022 FFSPHI FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 822 PM EDT MON JUL 6 2015 PAC029-045-070400- /O.CON.KPHI.FF.W.0030.000000T0000Z-150707T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ DELAWARE PA-CHESTER PA- 822 PM EDT MON JUL 6 2015 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT EDT FOR CENTRAL DELAWARE AND EAST CENTRAL CHESTER COUNTIES... AT 821 PM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. UP TO THREE INCHES OF RAIN HAVE ALREADY FALLEN IN SOME AREAS WITH ADDITIONAL HEAVY RAINFALL OCCURRING WHICH WILL PRODUCE ANOTHER INCH OR MORE. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... LIMA...CONCORDVILLE...CHELSEA...GRADYVILLE...TROUT LAKE...ELAM... NEWTOWN SQUARE...CHEYNEY...BROOMALL...PAOLI...CHESTER TOWNSHIP... NETHER PROVIDENCE TOWNSHIP...RADNOR TOWNSHIP...BROOKHAVEN...MEDIA... CHESTER HEIGHTS...ROSE VALLEY...BOOTHWYN...VILLAGE GREEN-GREEN RIDGE AND UPPER PROVIDENCE TOWNSHIP. PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT ENTER OR CROSS FLOWING WATER OR WATER OF UNKNOWN DEPTH. TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD DEATHS OCCUR IN VEHICLES. && LAT...LON 4000 7534 3982 7543 3986 7557 4004 7549 $$ ROBERTSON
687 WGUS71 KPHI 070137 FFSPHI FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 937 PM EDT MON JUL 6 2015 PAC029-045-070145- /O.CAN.KPHI.FF.W.0030.000000T0000Z-150707T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ DELAWARE PA-CHESTER PA- 937 PM EDT MON JUL 6 2015 ...THE FLASH FLOOD WARNING FOR CENTRAL DELAWARE AND EAST CENTRAL CHESTER COUNTIES IS CANCELLED... THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO POSE A THREAT. IF THERE IS WATER ON ROADWAYS...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. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. LAT...LON 4000 7534 3982 7543 3986 7557 4004 7549 $$ ROBERTSON
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 6:50 PM EDT | Special Weather Statement | PHI | Berks, Montgomery | 40 min |
| Jul 6, 7:10 PM EDT | Special Weather Statement | PHI | Delaware | 50 min |
| Jul 6, 7:19 PM EDT | Areal Flood Advisory | PHI | Chester, Delaware, Montgomery | 4 hr |
| Jul 6, 7:49 PM EDT | Special Weather Statement | PHI | Lehigh, Northampton | 41 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2015Every flash flood warning in 2015
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.