Alert archive / Pennsylvania / Flash Flood Watches in 2015
Flash Flood Watch 6, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at Sep 10, 2015, 12:34 PM EDT for 4 states. It took effect at Sep 10, 2015, 1:00 PM EDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Sep 10, 2015, 12:34 PM EDT (16:34 UTC)
- In effect from
- Sep 10, 2015, 1:00 PM EDT
- Expired
- Sep 10, 2015, 7:02 PM EDT
- In force
- 6 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
Counties Kent County, DE, New Castle County, DE, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Mercer County, NJ, Salem County, NJ, Berks County, PA, Bucks County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 87 km from the middle of the area, began a volume at 16:36 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, 4.6 hours before the alert went out and 199 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
- 58 J/kg
- Mixed-layer CIN
- -85 J/kg
- Mixed-layer LCL
- 843 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
139 WGUS61 KPHI 101634 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1234 PM EDT THU SEP 10 2015 DEZ001-002-MDZ008-012-015-NJZ015>019-PAZ060>062-070-071-101>106- 110000- /O.NEW.KPHI.FF.A.0006.150910T1700Z-150911T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-KENT-CECIL-KENT MD-QUEEN ANNES-MERCER-SALEM-GLOUCESTER- CAMDEN-NORTHWESTERN BURLINGTON-BERKS-LEHIGH-NORTHAMPTON-DELAWARE- PHILADELPHIA-WESTERN CHESTER-EASTERN CHESTER-WESTERN MONTGOMERY- EASTERN MONTGOMERY-UPPER BUCKS-LOWER BUCKS- INCLUDING THE CITIES OF...WILMINGTON...DOVER...ELKTON... CHESTERTOWN...CENTREVILLE...TRENTON...PENNSVILLE...GLASSBORO... CAMDEN...CHERRY HILL...MOORESTOWN...MOUNT HOLLY...READING... ALLENTOWN...BETHLEHEM...EASTON...MEDIA...PHILADELPHIA... HONEY BROOK...OXFORD...WEST CHESTER...KENNETT SQUARE... COLLEGEVILLE...POTTSTOWN...NORRISTOWN...LANSDALE...CHALFONT... PERKASIE...MORRISVILLE...DOYLESTOWN 1234 PM EDT THU SEP 10 2015 ...FLASH FLOOD WATCH IN EFFECT UNTIL 8 PM EDT THIS EVENING... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A * FLASH FLOOD WATCH FOR PORTIONS OF DELAWARE...NORTHEAST MARYLAND...NEW JERSEY AND PENNSYLVANIA...INCLUDING THE FOLLOWING IN DELAWARE...KENT ...AND NEW CASTLE. IN NORTHEAST MARYLAND...CECIL...KENT MD AND QUEEN ANNES. IN NEW JERSEY... CAMDEN...GLOUCESTER...MERCER...NORTHWESTERN BURLINGTON AND SALEM. IN PENNSYLVANIA...BERKS...DELAWARE...EASTERN CHESTER... EASTERN MONTGOMERY...LEHIGH...LOWER BUCKS...NORTHAMPTON... PHILADELPHIA...UPPER BUCKS...WESTERN CHESTER AND WESTERN MONTGOMERY. * UNTIL 8 PM EDT THIS EVENING * THUNDERSTORMS ARE EXPECTED TO CONTINUE TO DEVELOP AND MOVE OVER THE SAME AREAS IN SOUTHEASTERN PENNSYLVANIA...NORTHERN DELMARVA...AND PORTIONS OF SOUTHERN AND CENTRAL NEW JERSEY. MANY AREAS COULD SEE BETWEEN 1 TO 3 INCHES. POOR DRAINAGE AREAS WILL BE ESPECIALLY SUSCEPTIBLE TO FLOODING. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO A RAPID RISE OF WATER TO DANGEROUS LEVELS. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$
1 follow-up statement
741 WGUS61 KPHI 102302 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 702 PM EDT THU SEP 10 2015 DEZ001-002-MDZ008-012-015-NJZ015>019-PAZ060>062-070-071-101>106- 110015- /O.CAN.KPHI.FF.A.0006.000000T0000Z-150911T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-KENT-CECIL-KENT MD-QUEEN ANNES-MERCER-SALEM-GLOUCESTER- CAMDEN-NORTHWESTERN BURLINGTON-BERKS-LEHIGH-NORTHAMPTON-DELAWARE- PHILADELPHIA-WESTERN CHESTER-EASTERN CHESTER-WESTERN MONTGOMERY- EASTERN MONTGOMERY-UPPER BUCKS-LOWER BUCKS- INCLUDING THE CITIES OF...WILMINGTON...DOVER...ELKTON... CHESTERTOWN...CENTREVILLE...TRENTON...PENNSVILLE...GLASSBORO... CAMDEN...CHERRY HILL...MOORESTOWN...MOUNT HOLLY...READING... ALLENTOWN...BETHLEHEM...EASTON...MEDIA...PHILADELPHIA... HONEY BROOK...OXFORD...WEST CHESTER...KENNETT SQUARE... COLLEGEVILLE...POTTSTOWN...NORRISTOWN...LANSDALE...CHALFONT... PERKASIE...MORRISVILLE...DOYLESTOWN 702 PM EDT THU SEP 10 2015 ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR PORTIONS OF DELAWARE...NORTHEAST MARYLAND...NEW JERSEY AND PENNSYLVANIA HAS BEEN CANCELLED. LIGHT TO OCCASIONALLY MODERATE SHOWERS WILL CONTINUE THIS EVENING IN PARTS OF THE AREA. HOWEVER, THE THREAT OF ADDITIONAL HEAVY RAINFALL AND FLASH FLOODING HAS ENDED. $$ JRK
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 10, 4:46 AM EDT | Special Weather Statement | PHI | Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 1 more | 119 min |
| Sep 10, 6:35 AM EDT | Special Marine Warning | PHI | 55 min | |
| Sep 10, 6:40 AM EDT | Special Weather Statement | PHI | Atlantic | 65 min |
| Sep 10, 7:23 AM EDT | Special Marine Warning | PHI | 67 min | |
| Sep 10, 12:02 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Gloucester | 4 hr |
| Sep 10, 3:29 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Mercer, Somerset | 3 hr |
| Sep 10, 4:14 PM EDT | Areal Flood Advisory | PHI | Warren | 3 hr |
| Sep 10, 2:15 PM EDT | Areal Flood Warning | PHI | Philadelphia | 3 hr |
| Sep 10, 3:22 PM EDT | Areal Flood Advisory | PHI | Berks, Lehigh | 3 hr |
| Sep 10, 3:49 PM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Chester, Lehigh, Montgomery | 3 hr |
| Sep 10, 6:19 PM EDT | Flash Flood Warning | PHI | Chester, Montgomery | 116 min |
| Sep 10, 10:42 AM EDT | Special Weather Statement | PHI | Sussex | 63 min |
| Sep 10, 12:14 PM EDT | Special Weather Statement | PHI | Kent | 61 min |
| Sep 10, 12:17 PM EDT | Areal Flood Advisory | PHI | Kent | 4 hr |
| Sep 10, 3:52 PM EDT | Special Weather Statement | PHI | Kent | 38 min |
| Sep 10, 4:40 PM EDT | Areal Flood Advisory | PHI | Kent | 2 hr |
| Sep 9, 11:03 PM EDT | Special Weather Statement | PHI | Caroline | 27 min |
| Sep 10, 3:34 PM EDT | Special Weather Statement | PHI | Queen Anne's, Talbot | 56 min |
Nearby
Flash Flood Watches in Pennsylvania, 2015Flash Flood Watches in New Jersey, 2015Flash Flood Watches in Maryland, 2015Every flash flood watch 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.