Alert archive / Delaware / Areal Flood Advisories in 2023

Areal Flood Advisory 182, NWS Philadelphia/Mount Holly

September 10, 2023Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this areal flood advisory at Sep 10, 2023, 11:29 AM EDT for Sussex County, Delaware. It was in force for 76 min.

The area

The counties it named.

The facts

Issued: Sep 10, 2023, 11:29 AM EDT (15:29 UTC)
Expired: Sep 10, 2023, 12:45 PM EDT
In force: 76 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 18 km from the middle of the area, began a volume at 15:31 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, 3.5 hours before the alert went out and 322 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1034 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 789 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Philadelphia/Mount Holly wrote its last area forecast discussion before this areal flood advisory went out at Sep 10, 10:08 AM EDT, 1 hour 21 minutes earlier.

Area forecast discussion, Sep 10, 10:08 AM EDT, 1 hour 21 minutes before

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Hazardous weather outlook, Sep 10, 10:58 AM EDT, 31 minutes before

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In the hours before

Special weather statement, Sep 10, 9:37 AM EDT, 1 hour 52 minutes before

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Special weather statement, Sep 10, 10:57 AM EDT, 32 minutes before

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The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 10, 9:37 AM EDT	Special Weather Statement	PHI	Atlantic	53 min
Sep 10, 10:14 AM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Somerset	107 min
Sep 10, 11:37 AM EDT	Areal Flood Advisory	PHI	Monmouth	85 min
Sep 10, 5:48 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden	3 hr
Sep 10, 6:03 PM EDT	Flash Flood Warning	PHI	Burlington, Camden	3 hr
Sep 10, 6:07 PM EDT	Special Marine Warning	PHI		23 min
Sep 10, 7:11 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Warren	3 hr
Sep 10, 7:37 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Mercer, Middlesex, Monmouth	3 hr
Sep 10, 7:55 PM EDT	Flash Flood Warning	PHI	Burlington, Mercer	3 hr
Sep 9, 8:09 PM EDT	Areal Flood Advisory	PHI	Berks	20 min
Sep 9, 8:29 PM EDT	Flash Flood Warning	PHI	Berks	2 hr
Sep 9, 9:12 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe	116 min
Sep 10, 10:57 AM EDT	Special Weather Statement	PHI	Sussex	33 min

Nearby

Areal Flood Advisories in Delaware, 2023 Every areal flood advisory in 2023

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.