Alert archive / Pennsylvania / Areal Flood Warnings in 2021
Areal Flood Warning 4, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood warning at Mar 24, 2021, 9:42 PM EDT for Bucks 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
- Mar 24, 2021, 9:42 PM EDT (01:42 UTC)
- Expired
- Mar 25, 2021, 1:45 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Bucks County, PA
The radar
The Philadelphia radar (KDIX), 57 km from the middle of the area, began a volume at 01:45 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 195 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
- 4 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 510 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 209 m²/s²
- 0-3 km storm-relative helicity
- 270 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
796
WGUS41 KPHI 250142
FLWPHI
BULLETIN - EAS ACTIVATION REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
942 PM EDT Wed Mar 24 2021
PAC017-250545-
/O.NEW.KPHI.FA.W.0004.210325T0142Z-210325T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bucks PA-
942 PM EDT Wed Mar 24 2021
The National Weather Service in Mount Holly has issued a
* Flood Warning for...
Southeastern Bucks County in southeastern Pennsylvania...
* Until 145 AM EDT.
* At 942 PM EDT, gauge reports indicated minor flooding along the
Neshaminy Creek. Flooding is already occurring in the warned area.
Between 1 and 1.5 inches of rain have fallen.
For Neshaminy Creek at Langhorne:
At 9:15pm the stage was 7.0 feet.
Flood Stage is 9 feet.
...
For Neshaminy Creek at Penns Park:
At 9:30pm the stage was 13.14 feet.
Flood Stage is 13 feet.
This includes the following highways...
Pennsylvania Turnpike between exits 353 and 356.
Interstate 95 in Pennsylvania between mile markers 37 and 40.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4026 7513 4029 7509 4025 7494 4017 7488
4009 7487 4008 7493 4011 7494 4019 7505
$$
SFJ1 follow-up statement
212
WGUS81 KPHI 250538
FLSPHI
Flood Statement
National Weather Service Mount Holly NJ
138 AM EDT Thu Mar 25 2021
PAC017-250548-
/O.EXP.KPHI.FA.W.0004.000000T0000Z-210325T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bucks PA-
138 AM EDT Thu Mar 25 2021
...FLOOD WARNING WILL EXPIRE AT 145 AM EDT EARLY THIS MORNING FOR
SOUTHEASTERN BUCKS COUNTY...
Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 4026 7513 4029 7509 4025 7494 4017 7488
4009 7487 4008 7493 4011 7494 4019 7505
$$
CMSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 24, 8:06 PM EDT | River Flood Warning | PHI | Chester | 3 hr |
| Mar 25, 11:00 AM EDT | Wind Advisory | PHI | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 32 hr |
Nearby
Areal Flood Warnings in Pennsylvania, 2021Every areal flood warning in 2021
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.