Alert archive / Pennsylvania / Areal Flood Advisories in 2021
Areal Flood Advisory 28, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood advisory at Jun 9, 2021, 8:43 PM EDT for Chester County, Pennsylvania. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 9, 2021, 8:43 PM EDT (00:43 UTC)
- Expired
- Jun 9, 2021, 10:55 PM EDT
- In force
- 2 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
County Chester County, PA
The radar
The Dover AFB radar (KDOX), 127 km from the middle of the area, began a volume at 00:45 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
Washington/Dulle, VA (KIAD), launched 00:00Z, 0.7 hours before the alert went out and 165 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
- 186 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 1395 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
367
WGUS81 KPHI 100043
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
843 PM EDT Wed Jun 9 2021
PAC029-100345-
/O.NEW.KPHI.FA.Y.0028.210610T0043Z-210610T0345Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chester PA-
843 PM EDT Wed Jun 9 2021
The National Weather Service in Mount Holly has issued a
* Flood Advisory for...
Central Chester County in southeastern Pennsylvania...
* Until 1145 PM EDT.
* At 843 PM EDT, Doppler radar indicated heavy rain due to
thunderstorms. Minor flooding is ongoing or expected to begin
shortly in the advisory area. Between 1 and 1.5 inches of rain
have fallen in spots.
* Some locations that may experience flooding include...
West Chester, Coatesville, Downingtown, Kennett Square, Oxford,
Parkesburg, West Grove, Honey Brook, Cochranville, Marshallton,
Ladenberg, and Homeville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3997 7558 3985 7566 3976 7580 3981 7604
3981 7603 3983 7604 3982 7603 3983 7602
3985 7602 3985 7601 3987 7600 3987 7599
3991 7600 3993 7600 3993 7598 3995 7599
4004 7593 4011 7594 4014 7586
$$
Iovino1 follow-up statement
155
WGUS81 KPHI 100255
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
1055 PM EDT Wed Jun 9 2021
PAC029-100305-
/O.CAN.KPHI.FA.Y.0028.000000T0000Z-210610T0345Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chester PA-
1055 PM EDT Wed Jun 9 2021
...FLOOD ADVISORY IS CANCELLED FOR CENTRAL CHESTER COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3997 7558 3985 7566 3976 7580 3981 7604
3981 7603 3983 7604 3982 7603 3983 7602
3985 7602 3985 7601 3987 7600 3987 7599
3991 7600 3993 7600 3993 7598 3995 7599
4004 7593 4011 7594 4014 7586
$$
SFJThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 8:21 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 39 min |
Nearby
Areal Flood Advisories in Pennsylvania, 2021Every areal flood advisory 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.