Alert archive / Pennsylvania / Flash Flood Warnings in 2021
Flash Flood Warning 9, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 9, 2021, 4:54 PM EDT for Berks County, Montgomery County, Pennsylvania. It was in force for 112 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jun 9, 2021, 4:54 PM EDT (20:54 UTC)
- Expired
- Jun 9, 2021, 6:46 PM EDT
- In force
- 112 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Berks County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 115 km from the middle of the area, began a volume at 20:57 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, 8.9 hours before the alert went out and 225 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
- 193 J/kg
- Mixed-layer CIN
- -128 J/kg
- Mixed-layer LCL
- 1225 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -75 m²/s²
- 0-3 km storm-relative helicity
- 3 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
504
WGUS51 KPHI 092054
FFWPHI
PAC011-091-092345-
/O.NEW.KPHI.FF.W.0009.210609T2054Z-210609T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
454 PM EDT Wed Jun 9 2021
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
East Central Berks County in eastern Pennsylvania...
Northwestern Montgomery County in southeastern Pennsylvania...
* Until 745 PM EDT.
* At 454 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. Additional rainfall amounts of 0.5 to 1 inch are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
* Some locations that will experience flash flooding include...
Kutztown, Fleetwood, East Greenville, Topton, Bally,
Bechtelsville, Lyons, Gilbertsville, Geryville, Boyertown,
Pennsburg, and Red Hill.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4028 7569 4032 7585 4050 7594 4055 7580
4052 7565 4052 7564 4050 7562 4050 7561
4049 7560 4048 7558 4045 7553 4043 7550
4042 7548 4041 7547 4040 7546 4038 7543
4038 7542
FLASH FLOOD...RADAR INDICATED
$$
NC2 follow-up statements
887
WGUS71 KPHI 092148
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
548 PM EDT Wed Jun 9 2021
PAC091-092158-
/O.CAN.KPHI.FF.W.0009.000000T0000Z-210609T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery PA-
548 PM EDT Wed Jun 9 2021
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN MONTGOMERY
COUNTY...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
LAT...LON 4028 7569 4032 7585 4050 7594 4055 7580
4052 7565 4050 7562 4050 7561 4045 7553
4029 7566
$$
PAC011-092345-
/O.CON.KPHI.FF.W.0009.000000T0000Z-210609T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-
548 PM EDT Wed Jun 9 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM EDT THIS
EVENING FOR EAST CENTRAL BERKS COUNTY...
At 548 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms have produced heavy rain across the warned area.
Between 1.5 and 3 inches of rain have fallen. Flash flooding is
ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that will experience flash flooding include...
Kutztown, Fleetwood, Topton, Bally, Bechtelsville, Lyons, and
Boyertown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4028 7569 4032 7585 4050 7594 4055 7580
4052 7565 4050 7562 4050 7561 4045 7553
4029 7566
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
NC268
WGUS71 KPHI 092246
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
646 PM EDT Wed Jun 9 2021
PAC011-092256-
/O.CAN.KPHI.FF.W.0009.000000T0000Z-210609T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-
646 PM EDT Wed Jun 9 2021
...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL BERKS COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 4028 7569 4032 7585 4050 7594 4055 7580
4052 7565 4050 7562 4050 7561 4045 7553
4029 7566
$$
NCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 3:49 PM EDT | Flash Flood Warning | PHI | Bucks, Philadelphia | 3 hr |
| Jun 9, 5:27 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Northampton | 23 min |
| Jun 9, 5:32 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 28 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2021Every flash 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.