Alert archive / Delaware / Flash Flood Warnings in 2014

Flash Flood Warning 45, NWS Philadelphia/Mount Holly

August 1, 2014Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 1, 2014, 2:20 PM EDT for Kent County, New Castle 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: Aug 1, 2014, 2:20 PM EDT (18:20 UTC)
Expired: Aug 1, 2014, 6:15 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Kent County, DE, New Castle County, DE

The radar

The Dover AFB radar (KDOX), 58 km from the middle of the area, began a volume at 18:19 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.3 hours before the alert went out and 52 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: 696 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 781 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 8 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

095 
WGUS51 KPHI 011820
FFWPHI
DEC001-003-012215-
/O.NEW.KPHI.FF.W.0045.140801T1820Z-140801T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
220 PM EDT FRI AUG 1 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN KENT COUNTY IN CENTRAL DELAWARE...
  SOUTHEASTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...

* UNTIL 615 PM EDT

* AT 213 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  POSSIBLE FLASH FLOODING FROM SLOW MOVING HEAVY THUNDERSTORMS OVER 
  THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO GREEN
  SPRING AND WOODLAND BEACH

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.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 3944 7555 3938 7551 3937 7550 3936 7549
      3922 7538 3921 7538 3921 7565 3943 7569

$$

AMC

1 follow-up statement

067 
WGUS71 KPHI 012019
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
419 PM EDT FRI AUG 1 2014

DEC001-003-012028-
/O.CAN.KPHI.FF.W.0045.000000T0000Z-140801T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NEW CASTLE DE-KENT DE-
419 PM EDT FRI AUG 1 2014

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHEASTERN KENT
AND SOUTHEASTERN NEW CASTLE COUNTIES...

THE HEAVY THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE MOVED AWAY 
AND NO FLOODING HAS BEEN REPORTED TO THE NATIONAL WEATHER SERVICE. 

LAT...LON 3944 7555 3938 7551 3937 7550 3936 7549
      3922 7538 3921 7538 3921 7565 3943 7569

$$

AMC

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 1:32 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	4 hr
Aug 1, 2:45 PM EDT	Special Weather Statement	PHI	New Castle	3 hr

Nearby

Flash Flood Warnings in Delaware, 2014 Every flash flood warning in 2014

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.