Alert archive / Pennsylvania / Areal Flood Advisories in 2021
Areal Flood Advisory 8, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood advisory at Apr 10, 2021, 3:22 AM EDT for New Castle County, Delaware; 5 counties in Pennsylvania; 4 counties in New Jersey. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 10, 2021, 3:22 AM EDT (07:22 UTC)
- Expired
- Apr 10, 2021, 5:49 AM EDT
- In force
- 2 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Salem County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 98 km from the middle of the area, began a volume at 07:22 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, 7.4 hours before the alert went out and 187 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
- 537 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 161 m²/s²
- 0-3 km storm-relative helicity
- 238 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
335
WGUS81 KPHI 100722
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
322 AM EDT Sat Apr 10 2021
DEC003-NJC005-007-015-033-PAC017-029-045-091-101-101030-
/O.NEW.KPHI.FA.Y.0008.210410T0722Z-210410T1030Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Burlington NJ-Camden NJ-Gloucester NJ-Salem NJ-Bucks
PA-Chester PA-Delaware PA-Montgomery PA-Philadelphia PA-
322 AM EDT Sat Apr 10 2021
The National Weather Service in Mount Holly has issued a
* Flood Advisory for...
Northern New Castle County in northern Delaware...
Northwestern Burlington County in southern New Jersey...
Northwestern Camden County in southern New Jersey...
Northwestern Gloucester County in southern New Jersey...
Northwestern Salem County in southern New Jersey...
South Central Bucks County in southeastern Pennsylvania...
Southeastern Chester County in southeastern Pennsylvania...
Delaware County in southeastern Pennsylvania...
Southeastern Montgomery County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
* Until 630 AM EDT.
* At 322 AM EDT, Doppler radar indicated heavy rain due to showers
and thunderstorms. Minor flooding is ongoing or expected to begin
shortly in the advisory area as these showers and storms are
putting down a quick inch to inch and a half of rain as they move
through.
* Some locations that will experience flooding include...
Philadelphia, Camden, Wilmington, Newark, West Chester, Gloucester
City, Cherry Hill, Bensalem, Mount Laurel, Norristown, Chester,
and Willingboro.
This includes the following highways...
New Jersey Turnpike between exits 1 and 4.
Pennsylvania Turnpike between exits 324 and 346.
Interstate 95 in Pennsylvania between mile markers 0 and 36.
Interstate 95 in Delaware between mile markers 0 and 23.
Interstate 76 in Pennsylvania between mile markers 327 and 351.
Interstate 76 in New Jersey between mile markers 0 and 3.
Interstate 295 in New Jersey between mile markers 0 and 44.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3972 7588 3987 7592 3994 7584 4020 7513
4011 7495 3995 7483 3958 7554 3963 7579
3972 7579
$$
Fitzsimmons1 follow-up statement
686
WGUS81 KPHI 100949
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
549 AM EDT Sat Apr 10 2021
DEC003-NJC005-007-015-033-PAC017-029-045-091-101-100959-
/O.CAN.KPHI.FA.Y.0008.000000T0000Z-210410T1030Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Burlington NJ-Camden NJ-Gloucester NJ-Salem NJ-Bucks
PA-Chester PA-Delaware PA-Montgomery PA-Philadelphia PA-
549 AM EDT Sat Apr 10 2021
...FLOOD ADVISORY IS CANCELLED FOR NORTHERN NEW CASTLE, NORTHWESTERN
BURLINGTON, NORTHWESTERN CAMDEN, NORTHWESTERN GLOUCESTER,
NORTHWESTERN SALEM, SOUTH CENTRAL BUCKS, SOUTHEASTERN CHESTER,
DELAWARE, SOUTHEASTERN MONTGOMERY, AND PHILADELPHIA COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat.
LAT...LON 3972 7588 3987 7592 3994 7584 4020 7513
4011 7495 3995 7483 3958 7554 3963 7579
3972 7579
$$
FitzsimmonsThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 1:19 AM EDT | Special Weather Statement | PHI | New Castle | 56 min |
| Apr 10, 2:34 AM EDT | Special Weather Statement | PHI | Chester | 41 min |
| Apr 10, 2:35 AM EDT | Special Weather Statement | PHI | Delaware | 40 min |
| Apr 10, 3:44 AM EDT | Special Weather Statement | PHI | Gloucester | 46 min |
| Apr 10, 4:42 AM EDT | Special Weather Statement | PHI | Gloucester | 48 min |
| Apr 10, 4:00 PM EDT | Small Craft Advisory | PHI | 3 days |
Nearby
Areal Flood Advisories in Pennsylvania, 2021Areal Flood Advisories in New Jersey, 2021Areal Flood Advisories in Delaware, 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.