Alert archive / Pennsylvania / Flash Flood Warnings in 2017
Flash Flood Warning 32, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 24, 2017, 9:44 PM EDT for Philadelphia 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 24, 2017, 9:44 PM EDT (01:44 UTC)
- Expired
- Jul 25, 2017, 1:45 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 59 km from the middle of the area, began a volume at 01:48 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
Brookhaven, NY (KOKX), launched 00:00Z, 1.7 hours before the alert went out and 211 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 608 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- -105 m²/s²
- 0-3 km storm-relative helicity
- -14 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
545 WGUS51 KPHI 250144 FFWPHI PAC101-250545- /O.NEW.KPHI.FF.W.0032.170725T0144Z-170725T0545Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Mount Holly NJ 944 PM EDT MON JUL 24 2017 The National Weather Service in Mount Holly NJ has issued a * Flash Flood Warning for... Central Philadelphia County in southeastern Pennsylvania... * Until 145 AM EDT * At 941 PM EDT...Doppler radar and automated rain gauges indicated thunderstorms had produced heavy rain across the warned area. Up to three inches of rain has fallen. Flash flooding is expected to begin shortly in the areas of heaviest rain. * Some locations that could experience flooding include... Philadelphia. Flood waters are moving down Frankford Creek and the flood crest is expected to exceed 7 feet. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. A Flash Flood Warning means that flooding is imminent or occurring. If you are in the warned area move to higher ground immediately. Residents living along streams and creeks should take immediate precautions to protect life and property. && LAT...LON 4003 7510 4001 7507 3999 7509 4001 7512 $$
1 follow-up statement
701 WGUS71 KPHI 250326 FFSPHI Flash Flood Statement National Weather Service Mount Holly NJ 1126 PM EDT MON JUL 24 2017 PAC101-250336- /O.CAN.KPHI.FF.W.0032.000000T0000Z-170725T0545Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Philadelphia PA- 1126 PM EDT MON JUL 24 2017 ...THE FLASH FLOOD WARNING FOR CENTRAL PHILADELPHIA COUNTY IS CANCELLED... Flood waters have receded. Flooding is no longer expected to pose a threat. Please continue to heed any remaining road closures. LAT...LON 4003 7510 4001 7507 3999 7509 4001 7512 $$
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 8:08 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 52 min |
| Jul 24, 8:19 PM EDT | Areal Flood Advisory | PHI | Bucks, Montgomery, Philadelphia | 116 min |
| Jul 24, 8:59 PM EDT | Areal Flood Advisory | PHI | Chester, Delaware, Montgomery, Philadelphia | 2 hr |
| Jul 24, 9:01 PM EDT | Special Weather Statement | PHI | Philadelphia | 59 min |
| Jul 24, 9:06 PM EDT | Areal Flood Advisory | PHI | Philadelphia | 114 min |
| Jul 24, 10:01 PM EDT | Areal Flood Advisory | PHI | Philadelphia | 119 min |
| Jul 24, 11:11 PM EDT | Areal Flood Warning | PHI | Montgomery | 4 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2017Every flash flood warning in 2017
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.