Alert archive / Delaware / Areal Flood Advisories in 2021
Areal Flood Advisory 101, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood advisory at Aug 7, 2021, 9:49 PM EDT for Caroline County, Maryland; Kent County, Sussex County, Delaware. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 7, 2021, 9:49 PM EDT (01:49 UTC)
- Expired
- Aug 8, 2021, 2:20 AM EDT
- In force
- 5 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Kent County, DE, Sussex County, DE, Caroline County, MD
The radar
The Dover AFB radar (KDOX), 14 km from the middle of the area, began a volume at 01:52 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, 1.8 hours before the alert went out and 86 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
- 86 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 512 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 173 m²/s²
- 0-3 km storm-relative helicity
- 241 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
835
WGUS81 KPHI 080149
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
949 PM EDT Sat Aug 7 2021
DEC001-005-MDC011-080645-
/O.NEW.KPHI.FA.Y.0101.210808T0149Z-210808T0645Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kent DE-Sussex DE-Caroline MD-
949 PM EDT Sat Aug 7 2021
The National Weather Service in Mount Holly has issued a
* Urban and Small Stream Flood Advisory for...
South Central Kent County in central Delaware...
Sussex County in southern Delaware...
Eastern Caroline County in eastern Maryland...
* Until 245 AM EDT.
* At 949 PM EDT, Doppler radar indicated heavy rain. This will cause
urban and small stream flooding. Between 1 and 2 inches of rain
have already fallen with reports of street flooding near Dewy
Beach. Another 1 to 2 inches of rain will be possible in spots.
* Some locations that will experience flooding include...
Georgetown, Milford, Seaford, Millsboro, Laurel, Lewes, Milton,
Bridgeville, Dagsboro, Millville, Ellendale, and Henlopen Acres.
LAT...LON 3865 7572 3882 7573 3895 7533 3888 7516
3881 7506 3846 7504 3846 7569 3864 7571
$$
Fitzsimmons1 follow-up statement
441
WGUS81 KPHI 080620
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
220 AM EDT Sun Aug 8 2021
DEC001-005-MDC011-080630-
/O.CAN.KPHI.FA.Y.0101.000000T0000Z-210808T0645Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kent DE-Sussex DE-Caroline MD-
220 AM EDT Sun Aug 8 2021
...THE URBAN AND SMALL STREAM FLOOD ADVISORY IS CANCELLED FOR SOUTH
CENTRAL KENT, SUSSEX, AND EASTERN CAROLINE COUNTIES...
The heavy rain has ended. Urban and small stream flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
LAT...LON 3865 7572 3882 7573 3895 7533 3888 7516
3881 7506 3846 7504 3846 7569 3864 7571
$$
DealNearby
Areal Flood Advisories in Delaware, 2021Areal Flood Advisories in Maryland, 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.