Alert archive / Delaware / Areal Flood Warnings in 2016

Areal Flood Warning 22, NWS Philadelphia/Mount Holly

September 30, 2016Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this areal flood warning at Sep 30, 2016, 5:29 AM EDT for Sussex County, Delaware. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 30, 2016, 5:29 AM EDT (09:29 UTC)
Expired: Sep 30, 2016, 9:15 AM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 9 km from the middle of the area, began a volume at 09:31 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

Wallops Is Stn, VA (KWAL), launched 00:00Z, 9.5 hours before the alert went out and 91 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: 1819 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 281 m²/s²
0-3 km storm-relative helicity: 302 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

473 
WGUS41 KPHI 300929
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
529 AM EDT FRI SEP 30 2016

DEC005-301315-
/O.NEW.KPHI.FA.W.0022.160930T0929Z-160930T1315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUSSEX DE-
529 AM EDT FRI SEP 30 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLOOD WARNING FOR...
  SUSSEX COUNTY IN SOUTHERN DELAWARE...

* UNTIL 915 AM EDT

* AT 515 AM EDT...WIDESPREAD FLOODING CONTINUED ON MANY LOCAL
  ROADWAYS THIS MORNING. LOCAL CREEKS AND STREAMS CONTINUED TO RISE
  AS WELL. RAINFALL IS PARTS OF EASTERN SUSSEX COUNTY...NEAR
  HARBESON HAVE EXCEEDED 12 INCHES SO FAR OVER THE PAST 36 HOURS.
  NUMEROUS ROADS ACROSS THESE AREAS ARE CLOSED AND IMPASSABLE. DO
  NOT DRIVE IN THESE AREAS. THE NEXT HIGH TIDE ALONG THE COAST AND
  BACK BAYS RUNS FROM ABOUT 730 TO 930 AM. THE HIGHER THAN NORMAL
  TIDE WILL PROHIBIT OR SLOW DOWN DRAINAGE. 
  
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  GEORGETOWN...MILFORD...SEAFORD...MILLSBORO...LAUREL...LEWES...
  MILTON...SELBYVILLE...BRIDGEVILLE...DELMAR...DAGSBORO...
  MILLVILLE...ELLENDALE...HENLOPEN ACRES...SYCAMORE...
  CAPE HENLOPEN STATE PARK...GUMBORO...LONG NECK...
  OCEAN VIEW AND BLADES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

&&

LAT...LON 3846 7569 3882 7572 3884 7567 3883 7562
      3884 7561 3884 7555 3888 7551 3894 7531
      3881 7514 3880 7508 3845 7505

$$

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 30, 1:40 AM EDT	Coastal Flood Advisory	PHI	Kent, New Castle, Sussex	13 hr
Sep 30, 2:40 AM EDT	Areal Flood Warning	PHI	Kent	4 hr
Sep 30, 3:34 AM EDT	Areal Flood Advisory	PHI	Kent, New Castle	4 hr
Sep 30, 4:09 AM EDT	River Flood Warning	PHI	New Castle	13 hr
Sep 30, 6:44 AM EDT	Areal Flood Warning	PHI	Kent	4 hr
Sep 30, 7:24 AM EDT	Areal Flood Advisory	PHI	Kent, New Castle	4 hr
Sep 30, 9:02 AM EDT	Areal Flood Warning	PHI	Sussex	39 hr
Sep 30, 10:30 AM EDT	Areal Flood Warning	PHI	Kent	4 hr
Sep 30, 2:29 PM EDT	Areal Flood Warning	PHI	Kent	19 hr
Sep 30, 3:03 PM EDT	Coastal Flood Advisory	PHI	Kent, Sussex	20 hr
Sep 30, 6:04 PM EDT	Rip Current Statement	PHI	Sussex	3 hr

Nearby

Areal Flood Warnings in Delaware, 2016 Every areal flood warning in 2016

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.