Alert archive / New Jersey / Flash Flood Warnings in 2018
Flash Flood Warning 102, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 25, 2018, 5:14 PM EDT for Mercer County, Middlesex County, Somerset County, New Jersey; Bucks County, Pennsylvania. It was in force for 4 hr. 3 reports 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
- Sep 25, 2018, 5:14 PM EDT (21:14 UTC)
- Expired
- Sep 25, 2018, 9:15 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Mercer County, NJ, Middlesex County, NJ, Somerset County, NJ, Bucks County, PA
The radar
The Philadelphia radar (KDIX), 46 km from the middle of the area, began a volume at 21:18 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 |
|---|---|---|---|
| Sep 25, 6:15 PM EDT | FLASH FLOOD | 1 Wsw White Horse, NJ | FLOODING AT UNDERPASSES AT THE INTERSECTION OF I-195 AND I-295. |
| Sep 25, 6:15 PM EDT | FLASH FLOOD | Trenton, NJ | MULTIPLE INTERSECTIONS AND ROADWAYS ARE BEGINNING TO FLOOD. 2.5 INCHES OF RAIN RECEIVED SO FAR TODAY. |
| Sep 25, 6:47 PM EDT | FLOOD | Morrisville, PA | SEVERAL ROADWAYS FLOODED IN THE AREA. |
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, 9.2 hours before the alert went out and 175 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
- 457 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 413 m²/s²
- 0-3 km storm-relative helicity
- 577 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
202
WGUS51 KPHI 252114
FFWPHI
NJC021-023-035-PAC017-260115-
/O.NEW.KPHI.FF.W.0102.180925T2114Z-180926T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
514 PM EDT TUE SEP 25 2018
The National Weather Service in Mount Holly NJ has issued a
* Flash Flood Warning for...
Mercer County in central New Jersey...
South central Somerset County in northern New Jersey...
Southwestern Middlesex County in northern New Jersey...
Southeastern Bucks County in southeastern Pennsylvania...
* Until 915 PM EDT.
* At 513 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Flash flooding is expected to
begin shortly in the areas of heaviest rain.
* Some locations that could experience flooding include...
Trenton, Ewing, Princeton, Bristol, Hightstown, Cranbury,
Pennington, Yardley, Hopewell, Tullytown, Rocky Hill, Washington
Crossing, Skillman, Princeton Meadows, Windsor, Kingston,
Plainsboro Center, Clearbrook Park, Edinburg and White Horse.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.
&&
LAT...LON 4009 7489 4024 7484 4032 7493 4046 7463
4030 7445
$$
Fitzsimmons2 follow-up statements
154
WGUS71 KPHI 252346
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
746 PM EDT TUE SEP 25 2018
NJC021-023-035-PAC017-260115-
/O.CON.KPHI.FF.W.0102.000000T0000Z-180926T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mercer NJ-Somerset NJ-Middlesex NJ-Bucks PA-
746 PM EDT TUE SEP 25 2018
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM EDT FOR
MERCER...SOUTH CENTRAL SOMERSET...SOUTHWESTERN MIDDLESEX AND
SOUTHEASTERN BUCKS COUNTIES...
At 742 PM EDT, the heavy rain that prompted the Flash Flood Warning
has moved out of the area. However there have been reports of
multiple flooded roadways across Mercer County and rises continue on
area creeks, streams, and rivers as the water makes its way through
the river system. Therefore, the Flash Flood Warning remains in
effect.
Some locations that could experience flooding include...
Trenton, Ewing, Princeton, Bristol, Hightstown, Cranbury, Pennington,
Yardley, Hopewell, Tullytown, Rocky Hill, Washington Crossing,
Skillman, Princeton Meadows, Windsor, Kingston, Plainsboro Center,
Clearbrook Park, Edinburg and White Horse.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.
&&
LAT...LON 4009 7489 4024 7484 4032 7493 4046 7463
4030 7445
$$
Fitzsimmons747
WGUS71 KPHI 260113
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
913 PM EDT TUE SEP 25 2018
NJC021-023-035-PAC017-260122-
/O.EXP.KPHI.FF.W.0102.000000T0000Z-180926T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mercer NJ-Somerset NJ-Middlesex NJ-Bucks PA-
913 PM EDT TUE SEP 25 2018
...THE FLASH FLOOD WARNING FOR MERCER...SOUTH CENTRAL SOMERSET...
SOUTHWESTERN MIDDLESEX AND SOUTHEASTERN BUCKS COUNTIES WILL EXPIRE AT
915 PM EDT...
The heavy rain has ended. Flash flooding is no longer expected to
pose a threat. Please continue to heed any remaining road closures.
LAT...LON 4009 7489 4024 7484 4032 7493 4046 7463
4030 7445
$$
FitzsimmonsThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 25, 12:07 PM EDT | Special Weather Statement | PHI | Hunterdon, Morris, Somerset, Sussex, Warren | 23 min |
| Sep 25, 12:33 PM EDT | Rip Current Statement | PHI | Atlantic, Cape May, Monmouth, Ocean | 8 hr |
| Sep 25, 12:47 PM EDT | Special Weather Statement | PHI | Morris, Somerset, Sussex | 43 min |
| Sep 25, 2:30 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Morris, Somerset | 3 hr |
| Sep 25, 4:03 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 1 more | 3 hr |
| Sep 25, 4:19 PM EDT | Flash Flood Warning | PHI | Camden | 4 hr |
| Sep 25, 5:35 PM EDT | Flash Flood Warning | PHI | Burlington, Camden, Gloucester, Mercer | 4 hr |
| Sep 25, 6:03 PM EDT | Flash Flood Warning | PHI | Mercer, Middlesex, Monmouth | 3 hr |
| Sep 25, 6:39 PM EDT | Areal Flood Advisory | PHI | Atlantic, Burlington, Camden, Gloucester, Ocean | 3 hr |
| Sep 25, 6:47 PM EDT | Tornado Warning | PHI | Burlington | 32 min |
| Sep 25, 7:21 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 17 min |
| Sep 25, 2:59 PM EDT | Areal Flood Advisory | PHI | Bucks, Chester, Delaware, Lehigh, Montgomery | 4 hr |
Nearby
Flash Flood Warnings in New Jersey, 2018Flash Flood Warnings in Pennsylvania, 2018Every flash flood warning in 2018
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.