Alert archive / Pennsylvania / Flash Flood Warnings in 2017
Flash Flood Warning 31, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 24, 2017, 7:23 PM EDT for Bucks County, Lehigh County, Montgomery County, Pennsylvania. It was in force for 4 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 24, 2017, 7:23 PM EDT (23:23 UTC)
- Expired
- Jul 24, 2017, 11:30 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Bucks County, PA, Lehigh County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 101 km from the middle of the area, began a volume at 23:26 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 24, 8:00 PM EDT | FLOOD | 1 Wsw Quakertown, PA | 1 FOOT OF WATER ON ROADWAY |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 11.4 hours before the alert went out and 219 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 456 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 230 m²/s²
- 0-3 km storm-relative helicity
- 314 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
754
WGUS51 KPHI 242323
FFWPHI
PAC017-077-091-250330-
/O.NEW.KPHI.FF.W.0031.170724T2323Z-170725T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
723 PM EDT MON JUL 24 2017
The National Weather Service in Mount Holly NJ has issued a
* Flash Flood Warning for...
North central Montgomery County in southeastern Pennsylvania...
Southeastern Lehigh County in eastern Pennsylvania...
Northwestern Bucks County in southeastern Pennsylvania...
* Until 1130 PM EDT
* At 723 PM EDT...Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. One to
three inches of rain have fallen. Flash flooding is expected to
begin shortly in the areas of heaviest rain.
* Some locations that could experience flooding include...
Quakertown, Perkasie, Bedminster, East Greenville, Ottsville,
Zionsville, Geryville, Pennsburg, Coopersburg, Richlandtown and
Trumbauersville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4052 7546 4052 7518 4043 7514 4039 7522
4038 7541 4040 7554 4041 7556 4045 7553
4047 7557
$$
LF1 follow-up statement
147
WGUS71 KPHI 250320
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1120 PM EDT MON JUL 24 2017
PAC017-077-091-250330-
/O.EXP.KPHI.FF.W.0031.000000T0000Z-170725T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery PA-Lehigh PA-Bucks PA-
1120 PM EDT MON JUL 24 2017
...THE FLASH FLOOD WARNING FOR NORTH CENTRAL MONTGOMERY...
SOUTHEASTERN LEHIGH AND NORTHWESTERN BUCKS COUNTIES WILL EXPIRE AT
1130 PM EDT...
The heavy rain has ended. Flood waters have receded. Flooding is no
longer expected to pose a threat. Please continue to heed any
remaining road closures.
LAT...LON 4052 7546 4052 7518 4043 7514 4039 7522
4038 7541 4040 7554 4041 7556 4045 7553
4047 7557
$$
LFThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 1:33 AM EDT | Areal Flood Advisory | PHI | Bucks, Delaware, Montgomery, Philadelphia | 5 hr |
| Jul 24, 2:34 AM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 41 min |
| Jul 24, 3:00 AM EDT | Flash Flood Warning | PHI | Delaware, Montgomery, Philadelphia | 4 hr |
| Jul 24, 3:17 AM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Lehigh, Monroe, Montgomery, Northampton | 118 min |
| Jul 24, 3:21 AM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| Jul 24, 3:36 AM EDT | Areal Flood Advisory | PHI | Monroe, Northampton | 6 hr |
| Jul 24, 3:47 AM EDT | Areal Flood Advisory | PHI | Carbon, Lehigh, Monroe, Northampton | 118 min |
| Jul 24, 5:23 PM EDT | Special Weather Statement | PHI | Berks | 37 min |
| Jul 24, 5:31 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 59 min |
| Jul 24, 6:15 PM EDT | Special Weather Statement | PHI | Berks | 45 min |
| Jul 24, 6:30 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery | 60 min |
| Jul 24, 6:43 PM EDT | Flash Flood Warning | PHI | Berks, Lehigh, Northampton | 4 hr |
| Jul 24, 6:47 PM EDT | Flash Flood Warning | PHI | Berks | 4 hr |
| Jul 24, 7:07 PM EDT | Areal Flood Advisory | PHI | Northampton | 113 min |
| Jul 24, 7:07 PM EDT | Special Weather Statement | PHI | Berks | 23 min |
| Jul 24, 7:12 PM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 2 hr |
| Jul 24, 7:16 PM EDT | Areal Flood Advisory | PHI | Berks, Montgomery | 119 min |
| Jul 24, 7:26 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Montgomery | 49 min |
| Jul 24, 7:42 PM EDT | Areal Flood Advisory | PHI | Bucks, Chester, Montgomery | 2 hr |
| Jul 24, 7:48 PM EDT | Areal Flood Advisory | PHI | Bucks | 117 min |
| Jul 24, 7:50 PM EDT | Severe Thunderstorm Warning | PHI | Montgomery, Philadelphia | 25 min |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.