Alert archive / Delaware / Areal Flood Advisories in 2018

Areal Flood Advisory 11, NWS Philadelphia/Mount Holly

February 11, 2018Kent County, New Castle County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this areal flood advisory at Feb 11, 2018, 5:07 AM EST for Kent County, New Castle County, Sussex County, Delaware. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Feb 11, 2018, 5:07 AM EST (10:07 UTC)
Expired: Feb 11, 2018, 9:00 AM EST
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Kent County, DE, New Castle County, DE, Sussex County, DE

The radar

The Dover AFB radar (KDOX), 33 km from the middle of the area, began a volume at 10:09 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, 10.1 hours before the alert went out and 166 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 568 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 161 m²/s²
0-3 km storm-relative helicity: 216 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Feb 11, 4:52 AM EST, 15 minutes earlier.

Area forecast discussion, Feb 11, 4:52 AM EST, 15 minutes before

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Hazardous weather outlook, Feb 11, 3:17 AM EST, 1 hour 50 minutes before

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In the hours before

Local storm report, Feb 11, 12:29 AM EST, 4 hours 38 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
Feb 10, 9:01 PM EST	Marine Dense Fog Advisory	PHI		31 hr
Feb 10, 10:58 PM EST	Areal Flood Advisory	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	4 hr
Feb 10, 11:01 PM EST	Dense Fog Advisory	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 3 more	8 hr
Feb 11, 2:27 AM EST	Areal Flood Advisory	PHI	Atlantic, Cape May, Cumberland	4 hr
Feb 11, 6:01 AM EST	Areal Flood Advisory	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	18 hr
Feb 11, 7:53 AM EST	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Salem	16 hr
Feb 11, 10:00 AM EST	Areal Flood Advisory	PHI	Burlington, Monmouth, Ocean	4 hr
Feb 11, 10:04 AM EST	Special Weather Statement	PHI	Atlantic	26 min
Feb 11, 10:38 AM EST	Areal Flood Advisory	PHI	Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Morris and 2 more	14 hr
Feb 11, 10:57 AM EST	Areal Flood Advisory	PHI	Salem	12 hr
Feb 11, 12:24 PM EST	Areal Flood Warning	PHI	Hunterdon	4 hr
Feb 11, 12:33 PM EST	River Flood Warning	PHI	Somerset	40 hr
Feb 11, 12:37 PM EST	River Flood Warning	PHI	Burlington	67 hr
Feb 11, 2:07 PM EST	Areal Flood Advisory	PHI	Burlington, Monmouth, Ocean	4 hr
Feb 11, 5:57 PM EST	Areal Flood Advisory	PHI	Burlington, Monmouth, Ocean	6 hr
Feb 11, 6:47 PM EST	Dense Fog Advisory	PHI	Sussex, Warren	8 hr
Feb 11, 10:51 AM EST	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	8 hr
Feb 11, 3:15 PM EST	River Flood Warning	PHI	Bucks	17 hr
Feb 11, 6:58 AM EST	Areal Flood Warning	PHI	Kent	18 hr

Nearby

Areal Flood Advisories in Delaware, 2018 Every areal flood advisory in 2018

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.