Alert archive / Delaware / Areal Flood Advisories in 2018

Areal Flood Advisory 342, NWS Philadelphia/Mount Holly

November 9, 2018Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this areal flood advisory at Nov 9, 2018, 4:54 PM EST for Sussex County, Delaware. It was in force for 112 min.

The area

The counties it named.

The facts

Issued: Nov 9, 2018, 4:54 PM EST (21:54 UTC)
Expired: Nov 9, 2018, 6:46 PM EST
In force: 112 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 21:54 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 12:00Z, 9.9 hours before the alert went out and 84 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: 1073 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 372 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 Nov 9, 4:18 PM EST, 36 minutes earlier.

Area forecast discussion, Nov 9, 4:18 PM EST, 36 minutes before

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Hazardous weather outlook, Nov 9, 4:28 PM EST, 26 minutes before

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In the hours before

Local storm report, Nov 9, 3:56 PM EST, 58 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
356 PM EST FRI NOV 09 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0330 PM     FLOOD            BROOKLAWN               39.88N  75.12W
11/09/2018                   CAMDEN             NJ   DEPT OF HIGHWAYS

            US-130 BETWEEN CR-551/NEW BROADWAY AND RT-47/BROOKLAWN
            CIRCLE CLOSED DUE TO FLOODING.

&&

EVENT NUMBER PHI1801845

MPS

Local storm report, Nov 9, 4:00 PM EST, 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
400 PM EST FRI NOV 09 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0224 PM     FLOOD            ODESSA                  39.46N  75.66W
11/09/2018                   NEW CASTLE         DE   DEPT OF HIGHWAYS

            OLD STATE ROAD IS CLOSED BETWEEN CORBITT AND MAIN
            STREET DUE TO FLOODING.

&&

EVENT NUMBER PHI1801846

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 9, 1:37 AM EST	Gale Warning	PHI		40 hr
Nov 9, 3:23 AM EST	Coastal Flood Advisory	PHI	Cape May, Cumberland, Salem	11 hr
Nov 9, 3:23 AM EST	Coastal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer	14 hr
Nov 9, 2:03 PM EST	Freeze Warning	PHI	Atlantic, Camden, Cape May, Gloucester, Salem	43 hr
Nov 9, 4:42 PM EST	Areal Flood Advisory	PHI	Burlington, Camden, Cumberland, Gloucester, Hunterdon, Mercer and 1 more	4 hr
Nov 9, 5:52 PM EST	Areal Flood Advisory	PHI	Atlantic, Cape May	4 hr
Nov 9, 5:57 PM EST	Special Marine Warning	PHI		63 min
Nov 9, 6:53 PM EST	Special Marine Warning	PHI		67 min
Nov 9, 6:58 PM EST	Areal Flood Advisory	PHI	Atlantic, Burlington, Ocean	4 hr
Nov 9, 5:46 PM EST	Areal Flood Warning	PHI	Sussex	69 min

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.