Alert archive / Pennsylvania / Areal Flood Advisories in 2020
Areal Flood Advisory 21, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood advisory at Jun 5, 2020, 3:48 PM EDT for 5 counties in Pennsylvania. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 5, 2020, 3:48 PM EDT (19:48 UTC)
- Expired
- Jun 5, 2020, 7:17 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 74 km from the middle of the area, began a volume at 19:48 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 12:00Z, 7.8 hours before the alert went out and 217 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
- 34 J/kg
- Mixed-layer CIN
- -275 J/kg
- Mixed-layer LCL
- 685 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
958
WGUS81 KPHI 051948
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
348 PM EDT Fri Jun 5 2020
PAC017-029-045-091-101-052345-
/O.NEW.KPHI.FA.Y.0021.200605T1948Z-200605T2345Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery PA-Bucks PA-Chester PA-Philadelphia PA-Delaware PA-
348 PM EDT Fri Jun 5 2020
The National Weather Service in Mount Holly NJ has issued a
* Flood Advisory for Minor Flooding in Poor Drainage Areas for...
Southeastern Montgomery County in southeastern Pennsylvania...
Southeastern Bucks County in southeastern Pennsylvania...
East central Chester County in southeastern Pennsylvania...
Northern Philadelphia County in southeastern Pennsylvania...
Central Delaware County in southeastern Pennsylvania...
* Until 745 PM EDT.
* At 347 PM EDT, Doppler radar indicated heavy rain due to
thunderstorms. This will cause minor flooding. Overflowing poor
drainage areas will result in minor flooding in the advisory area.
Up to one inch of rain has already fallen.
* Some locations that could experience flooding include...
Philadelphia, Norristown, Chester, Lansdale, West Norriton, East
Norriton, Yeadon, Doylestown, Conshohocken, Hatboro, Ambler,
Swarthmore, Jenkintown, Narberth, Chalfont, East Lansdowne,
Rockledge, Newtown, Abington and Langhorne.
This includes the following highways...
Interstate 476 in Pennsylvania between mile markers 1 and 19.
Pennsylvania Turnpike between exits 320 and 353.
Northeast Extension near exit A20.
Interstate 76 in Pennsylvania between mile markers 327 and 342.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
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 4040 7507 4020 7483 3987 7537 3991 7552
4005 7562
$$
Kruzdlo3 follow-up statements
440
WGUS81 KPHI 052123
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
523 PM EDT Fri Jun 5 2020
PAC017-029-045-091-101-052345-
/O.CON.KPHI.FA.Y.0021.000000T0000Z-200605T2345Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery PA-Bucks PA-Chester PA-Philadelphia PA-Delaware PA-
523 PM EDT Fri Jun 5 2020
...THE FLOOD ADVISORY FOR MINOR FLOODING IN POOR DRAINAGE AREAS
REMAINS IN EFFECT UNTIL 745 PM EDT FOR SOUTHEASTERN MONTGOMERY...
SOUTHEASTERN BUCKS...EAST CENTRAL CHESTER...NORTHERN PHILADELPHIA AND
CENTRAL DELAWARE COUNTIES...
At 516 PM EDT, Doppler radar and automated rain gauges indicated
heavy rain due to thunderstorms. This will cause minor flooding.
Overflowing poor drainage areas will result in minor flooding in the
advisory area. Up to one inch of rain has already fallen. Law
enforcement has indicated several roads have flooded including
portions of US Highway 202 in Chester County PA.
Some locations that could experience flooding include...
Philadelphia, Norristown, Chester, Lansdale, West Norriton, East
Norriton, Yeadon, Doylestown, Conshohocken, Hatboro, Ambler,
Swarthmore, Jenkintown, Narberth, Chalfont, East Lansdowne,
Rockledge, Newtown, Abington and Langhorne.
This includes the following highways...
Interstate 476 in Pennsylvania between mile markers 1 and 19.
Pennsylvania Turnpike between exits 320 and 353.
Northeast Extension near exit A20.
Interstate 76 in Pennsylvania between mile markers 327 and 342.
Additional rainfall of one half to one inch is expected over the
area. This additional rain will result in minor flooding.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
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 4040 7507 4020 7483 3987 7537 3991 7552
4005 7562
$$
Deal660
WGUS81 KPHI 052232
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
632 PM EDT Fri Jun 5 2020
PAC017-029-045-091-101-052345-
/O.CON.KPHI.FA.Y.0021.000000T0000Z-200605T2345Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery PA-Bucks PA-Chester PA-Philadelphia PA-Delaware PA-
632 PM EDT Fri Jun 5 2020
...THE FLOOD ADVISORY FOR MINOR FLOODING IN POOR DRAINAGE AREAS
REMAINS IN EFFECT UNTIL 745 PM EDT FOR SOUTHEASTERN MONTGOMERY...
SOUTHEASTERN BUCKS...EAST CENTRAL CHESTER...NORTHERN PHILADELPHIA AND
CENTRAL DELAWARE COUNTIES...
At 626 PM EDT, Doppler radar and automated rain gauges indicated
heavy rain due to thunderstorms fell earlier this afternoon causing
minor flooding. While there has been a lull in the heavy rainfall
over the last hour, there is another round of showers that will
bring one half to one inch of additional rainfall which will cause
minor flooding over the advisory area in areas of poor drainage
areas.
Some locations that could experience flooding include...
Philadelphia, Norristown, Chester, Lansdale, West Norriton, East
Norriton, Yeadon, Doylestown, Conshohocken, Hatboro, Ambler,
Swarthmore, Jenkintown, Narberth, Chalfont, East Lansdowne,
Rockledge, Newtown, Abington and Langhorne.
This includes the following highways...
Interstate 476 in Pennsylvania between mile markers 1 and 19.
Pennsylvania Turnpike between exits 320 and 353.
Northeast Extension near exit A20.
Interstate 76 in Pennsylvania between mile markers 327 and 342.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
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 4040 7507 4020 7483 3987 7537 3991 7552
4005 7562
$$
Deal417
WGUS81 KPHI 052317
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
717 PM EDT Fri Jun 5 2020
PAC017-029-045-091-101-052324-
/O.CAN.KPHI.FA.Y.0021.000000T0000Z-200605T2345Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery PA-Bucks PA-Chester PA-Philadelphia PA-Delaware PA-
717 PM EDT Fri Jun 5 2020
...THE FLOOD ADVISORY HAS BEEN CANCELLED FOR SOUTHEASTERN
MONTGOMERY...SOUTHEASTERN BUCKS...EAST CENTRAL CHESTER...NORTHERN
PHILADELPHIA AND CENTRAL DELAWARE COUNTIES...
Although some light to moderate rain is expected over the next hour
or two, the threat of heavy rain has ended. As a result, minor
flooding is no longer expected.
LAT...LON 4040 7507 4020 7483 3987 7537 3991 7552
4005 7562
$$
KruzdloThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 4, 10:05 PM EDT | Special Weather Statement | PHI | Chester, Delaware, Montgomery, Philadelphia | 40 min |
| Jun 4, 10:31 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 46 min |
| Jun 4, 10:46 PM EDT | Areal Flood Advisory | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 119 min |
| Jun 5, 9:47 AM EDT | Flash Flood Watch | PHI | Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 2 more | 12 hr |
| Jun 5, 3:15 PM EDT | Special Weather Statement | PHI | Bucks, Montgomery | 30 min |
| Jun 5, 4:14 PM EDT | Special Weather Statement | PHI | Berks | 16 min |
| Jun 5, 5:01 PM EDT | Areal Flood Advisory | PHI | Bucks | 4 hr |
| Jun 5, 5:19 PM EDT | Areal Flood Advisory | PHI | Bucks, Delaware, Philadelphia | 4 hr |
Nearby
Areal Flood Advisories in Pennsylvania, 2020Every areal flood advisory in 2020
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.