Alert archive / Pennsylvania / Flash Flood Watches in 2012
Flash Flood Watch 1, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at May 29, 2012, 12:29 PM EDT for 7 counties in Pennsylvania; New Castle County, Delaware. It took effect at May 29, 2012, 3:00 PM EDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- May 29, 2012, 12:29 PM EDT (16:29 UTC)
- In effect from
- May 29, 2012, 3:00 PM EDT
- Expired
- May 29, 2012, 8:34 PM EDT
- In force
- 6 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
Counties New Castle County, DE, Berks County, PA, Carbon County, PA, Delaware County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 106 km from the middle of the area, began a volume at 16:31 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, 4.5 hours before the alert went out and 116 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
- 667 J/kg
- Mixed-layer CIN
- -217 J/kg
- Mixed-layer LCL
- 1153 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- -39 m²/s²
- 0-3 km storm-relative helicity
- -10 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
024 WGUS61 KPHI 291629 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1229 PM EDT TUE MAY 29 2012 DEZ001-PAZ054-055-060>062-067>071-300030- /O.NEW.KPHI.FF.A.0001.120529T1900Z-120530T0800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON-CHESTER- MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- INCLUDING THE CITIES OF...WILMINGTON...JIM THORPE...STROUDSBURG... READING...ALLENTOWN...BETHLEHEM...EASTON...WEST CHESTER... NORRISTOWN...DOYLESTOWN...MEDIA...PHILADELPHIA 1229 PM EDT TUE MAY 29 2012 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A * FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN DELAWARE AND PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NORTHERN DELAWARE...NEW CASTLE. IN PENNSYLVANIA...BERKS...BUCKS... CARBON...CHESTER...DELAWARE...LEHIGH...MONROE...MONTGOMERY... NORTHAMPTON AND PHILADELPHIA. * THROUGH LATE TONIGHT * SUMMERLIKE CONDITIONS WITH AN APPROACHING COLD FRONT WILL PRODUCE SEVERAL BANDS OF VERY HEAVY RAIN IN EASTERN PENNSYLVANIA AND NORTHERN DELAWARE...MAINLY BETWEEN 5 PM AND MIDNIGHT. * IF 1 TO 2 INCHES OF RAIN OCCURS IN AN HOUR ON URBAN SURFACES FROM WILMINGTON TO PHILADELPHIA AS WELL AS IN PORTIONS OF MONROE...CARBON...BUCKS...LEHIGH AND BERKS COUNTIES THAT RECEIVED 2 TO 6 INCHES OF RAIN THIS PAST WEEKEND...FLASH FLOODING WOULD RESULT. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ DRAG
2 follow-up statements
760 WGUS61 KPHI 292153 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 553 PM EDT TUE MAY 29 2012 DEZ001-PAZ054-055-060>062-067>071-300800- /O.CON.KPHI.FF.A.0001.000000T0000Z-120530T0800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON-CHESTER- MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- INCLUDING THE CITIES OF...WILMINGTON...JIM THORPE...STROUDSBURG... READING...ALLENTOWN...BETHLEHEM...EASTON...WEST CHESTER... NORRISTOWN...DOYLESTOWN...MEDIA...PHILADELPHIA 553 PM EDT TUE MAY 29 2012 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 4 AM EDT WEDNESDAY... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF NORTHERN DELAWARE AND PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NORTHERN DELAWARE...NEW CASTLE. IN PENNSYLVANIA...BERKS...BUCKS...CARBON...CHESTER...DELAWARE... LEHIGH...MONROE...MONTGOMERY...NORTHAMPTON AND PHILADELPHIA. * UNTIL 4 AM EDT WEDNESDAY * SUMMER-LIKE CONDITIONS THIS EVENING UNTIL A COLD FRONT WITH THUNDERSTORMS CROSS THE AREA. THE THUNDERSTORMS WILL PRODUCE BANDS OF HEAVY RAINFALL UNTIL AROUND MIDNIGHT. * FLASH FLOODING WILL RESULT IF 1 TO 2 INCHES OF RAIN FALLS ON URBAN AREAS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$
396 WGUS61 KPHI 300034 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 834 PM EDT TUE MAY 29 2012 DEZ001-PAZ054-055-060>062-067>071-300145- /O.CAN.KPHI.FF.A.0001.000000T0000Z-120530T0800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON-CHESTER- MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- INCLUDING THE CITIES OF...WILMINGTON...JIM THORPE...STROUDSBURG... READING...ALLENTOWN...BETHLEHEM...EASTON...WEST CHESTER... NORRISTOWN...DOYLESTOWN...MEDIA...PHILADELPHIA 834 PM EDT TUE MAY 29 2012 ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN DELAWARE AND PENNSYLVANIA HAS BEEN CANCELLED. THERE WILL STILL BE SHOWERS AND A FEW THUNDERSTORMS ACROSS THE AREA FOR THE NEXT FEW HOURS. THE RAINFALL RATES ARE NO LONGER EXPECTED TO BE GREAT ENOUGH TO CAUSE FLASH FLOODING. $$
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 1:36 PM EDT | Special Weather Statement | PHI | Monroe | 54 min |
| May 29, 1:50 PM EDT | Areal Flood Advisory | PHI | Carbon, Monroe | 115 min |
| May 29, 5:06 PM EDT | Special Weather Statement | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 114 min |
| May 29, 5:25 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh | 95 min |
| May 29, 5:45 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 75 min |
| May 29, 6:14 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Northampton | 91 min |
| May 29, 6:23 PM EDT | Flash Flood Warning | PHI | Carbon, Monroe | 112 min |
| May 29, 6:44 PM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Lehigh, Montgomery | 3 hr |
| May 29, 6:46 PM EDT | Special Weather Statement | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 89 min |
| May 29, 6:52 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Montgomery | 53 min |
| May 29, 7:34 PM EDT | Special Weather Statement | PHI | Delaware, Philadelphia | 56 min |
| May 29, 7:35 PM EDT | Areal Flood Advisory | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 115 min |
| May 29, 7:44 PM EDT | Special Weather Statement | PHI | Bucks | 61 min |
Nearby
Flash Flood Watches in Pennsylvania, 2012Flash Flood Watches in Delaware, 2012Every flash flood watch in 2012
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.