Alert archive / Maryland / Areal Flood Advisories in 2021
Areal Flood Advisory 95, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood advisory at Jul 17, 2021, 10:54 PM EDT for Caroline County, Maryland; Kent County, Delaware. It was in force for 48 min.
The area
The outline as issued.
The facts
- Issued
- Jul 17, 2021, 10:54 PM EDT (02:54 UTC)
- Expired
- Jul 17, 2021, 11:42 PM EDT
- In force
- 48 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Kent County, DE, Caroline County, MD
The radar
The Dover AFB radar (KDOX), 26 km from the middle of the area, began a volume at 02:56 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
Wallops Is Stn, VA (KWAL), launched 00:00Z, 2.9 hours before the alert went out and 122 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
- 1997 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 1118 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 74 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
391
WGUS81 KPHI 180254
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
1054 PM EDT Sat Jul 17 2021
DEC001-MDC011-180600-
/O.NEW.KPHI.FA.Y.0095.210718T0254Z-210718T0600Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kent DE-Caroline MD-
1054 PM EDT Sat Jul 17 2021
The National Weather Service in Mount Holly has issued a
* Flood Advisory for...
Kent County in central Delaware...
Central Caroline County in eastern Maryland...
* Until 200 AM EDT.
* At 1054 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 already fallen in spots. An additional inch is possible.
* Some locations that may experience flooding include...
Dover, Smyrna, Milford, Denton, Harrington, Camden, Greensboro,
Oakland, Ridgely, Cheswold, Bowers, and Goldsboro.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3921 7575 3935 7546 3926 7539 3909 7538
3900 7529 3895 7529 3893 7531 3895 7532
3896 7538 3893 7541 3890 7549 3884 7556
3882 7590 3888 7595 3888 7594 3894 7595
3897 7594 3907 7585 3911 7584 3914 7575
$$
Iovino1 follow-up statement
866
WGUS81 KPHI 180342 RRA
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
1142 PM EDT Sat Jul 17 2021
DEC001-MDC011-180352-
/O.CAN.KPHI.FA.Y.0095.000000T0000Z-210718T0600Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kent DE-Caroline MD-
1142 PM EDT Sat Jul 17 2021
...FLOOD ADVISORY IS CANCELLED FOR KENT AND CENTRAL CAROLINE
COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3921 7575 3935 7546 3926 7539 3909 7538
3900 7529 3895 7529 3893 7531 3895 7532
3896 7538 3893 7541 3890 7549 3884 7556
3882 7590 3888 7595 3888 7594 3894 7595
3897 7594 3907 7585 3911 7584 3914 7575
$$
IovinoThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 10:36 PM EDT | Special Weather Statement | PHI | Caroline | 24 min |
| Jul 17, 8:40 PM EDT | Special Weather Statement | PHI | Kent | 35 min |
| Jul 17, 9:25 PM EDT | Areal Flood Advisory | PHI | New Castle | 2 hr |
| Jul 17, 9:27 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 48 min |
| Jul 17, 9:36 PM EDT | Flash Flood Warning | PHI | New Castle | 2 hr |
| Jul 17, 10:55 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 50 min |
Nearby
Areal Flood Advisories in Maryland, 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.