Alert archive / Delaware / Areal Flood Advisories in 2021
Areal Flood Advisory 2, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood advisory at Feb 28, 2021, 5:20 PM EST for Kent County, New Castle County, Delaware. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 28, 2021, 5:20 PM EST (22:20 UTC)
- Expired
- Feb 28, 2021, 8:18 PM EST
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Kent County, DE, New Castle County, DE
The radar
The Dover AFB radar (KDOX), 85 km from the middle of the area, began a volume at 22:23 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, 10.3 hours before the alert went out and 173 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
- 801 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- 174 m²/s²
- 0-3 km storm-relative helicity
- 149 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
001
WGUS81 KPHI 282220
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
520 PM EST Sun Feb 28 2021
DEC001-003-010130-
/O.NEW.KPHI.FA.Y.0002.210228T2220Z-210301T0130Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kent DE-New Castle DE-
520 PM EST Sun Feb 28 2021
The National Weather Service in Mount Holly has issued a
* Flood Advisory for...
Kent County in central Delaware...
New Castle County in northern Delaware...
* Until 830 PM EST.
* At 520 PM EST, Doppler radar indicated heavy rain. Minor flooding
is ongoing or expected to begin shortly in the advisory area.
Between 0.5 and 1.5 inches of rain have fallen.
Some locations that may experience flooding include...
Wilmington, Dover, Newark, Middletown, Smyrna, Carneys Point,
Elsmere, New Castle, Penns Grove, Harrington, Camden, and Clayton.
This includes the following highways...
Interstate 95 in Delaware between mile markers 1 and 23.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Flood Advisory means river or stream flows are elevated, or
ponding of water in urban or other areas is occurring or is imminent.
&&
LAT...LON 3974 7577 3982 7566 3983 7548 3979 7542
3979 7541 3977 7545 3974 7547 3961 7559
3957 7551 3954 7553 3950 7552 3947 7555
3927 7536 3903 7538 3886 7572 3972 7579
3972 7577
$$
Davis1 follow-up statement
372
WGUS81 KPHI 010118
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
818 PM EST Sun Feb 28 2021
DEC001-003-010128-
/O.CAN.KPHI.FA.Y.0002.000000T0000Z-210301T0130Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kent DE-New Castle DE-
818 PM EST Sun Feb 28 2021
...FLOOD ADVISORY IS CANCELLED FOR KENT AND NEW CASTLE COUNTIES...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
LAT...LON 3974 7577 3982 7566 3983 7548 3979 7542
3979 7541 3977 7545 3974 7547 3961 7559
3957 7551 3954 7553 3950 7552 3947 7555
3927 7536 3903 7538 3886 7572 3972 7579
3972 7577
$$
DavisThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 28, 3:14 PM EST | Wind Advisory | PHI | New Castle, Sussex | 42 hr |
| Feb 28, 5:20 PM EST | Areal Flood Advisory | PHI | New Castle | 3 hr |
Nearby
Areal 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.