Alert archive / Delaware / Flash Flood Warnings in 2012

Flash Flood Warning 49, NWS Philadelphia/Mount Holly

September 3, 2012Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 3, 2012, 3:14 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: Sep 3, 2012, 3:14 PM EDT (19:14 UTC)
Expired: Sep 3, 2012, 6:45 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), 67 km from the middle of the area, began a volume at 19:16 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 12:00Z, 7.2 hours before the alert went out and 160 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: 383 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 718 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

509 
WGUS51 KPHI 031914
FFWPHI
DEC001-003-032315-
/O.NEW.KPHI.FF.W.0049.120903T1914Z-120903T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
314 PM EDT MON SEP 3 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN NEW CASTLE COUNTY...
  NORTHWESTERN KENT COUNTY...

* UNTIL 715 PM EDT...

* AT 312 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER NORTHWESTERN KENT AND
  SOUTHERN NEW CASTLE COUNTIES.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO RURAL AREAS
  OF NORTHWESTERN KENT AND SOUTHERN NEW CASTLE COUNTIES.

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE WARNED 
AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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. NEVER ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR IN AN
AUTOMOBILE. TURN AROUND DON'T DROWN!

PLEASE REPORT FLOODING...HAIL OR WIND DAMAGE TO THE NATIONAL WEATHER
SERVICE BY CALLING TOLL FREE...1-877-633-6772.

&&

LAT...LON 3950 7558 3946 7558 3942 7553 3937 7551
      3931 7543 3927 7576 3934 7577 3941 7577
      3942 7578 3948 7577

$$

FORECASTER: HEAVENER

2 follow-up statements

438 
WGUS71 KPHI 032102
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
502 PM EDT MON SEP 3 2012

DEC001-003-032315-
/O.CON.KPHI.FF.W.0049.000000T0000Z-120903T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NEW CASTLE DE-KENT DE-
502 PM EDT MON SEP 3 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 PM EDT FOR
NORTHWESTERN KENT AND SOUTHERN NEW CASTLE COUNTIES...

AT 455 PM EDT...THE HEAVIEST RAINS HAVE DEPARTED AND WERE MOVING 
NORTHEAST OF WILMINGTON DELAWARE.  

REPORTS OF FLOODING HAVE BEEN RECEIVED FROM MIDDLETOWN DELAWARE AND 
FLOODING MAY HAVE OCCURRED IN OTHER PORTIONS OF THE WARNING AREA. 

THE WORST OF THE RAIN HAS ENDED FOR THIS AFTERNOON.  HOWEVER...IT 
MAY TAKE A COUPLE OF HOURS FOR FLOOD WATERS TO RECEDE. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO RURAL AREAS
OF NORTHWESTERN KENT AND SOUTHERN NEW CASTLE COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THE RECENT HEAVY RAINFALL PROBABLY CAUSE 
FLOODING OF URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL 
AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

PLEASE REPORT FLOODING...HAIL OR WIND DAMAGE BY CALLING YOUR LOCAL
LAW ENFORCEMENT OFFICIALS OR BY CALLING THE NATIONAL WEATHER SERVICE
TOLL FREE AT...1-877-633-6772.

&&

LAT...LON 3950 7558 3946 7558 3942 7553 3937 7551
      3931 7543 3927 7576 3934 7577 3941 7577
      3942 7578 3948 7577

$$

FORECASTER:  DRAG

959 
WGUS71 KPHI 032245
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
645 PM EDT MON SEP 3 2012

DEC001-003-032242-
/O.CAN.KPHI.FF.W.0049.000000T0000Z-120903T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NEW CASTLE DE-KENT DE-
645 PM EDT MON SEP 3 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHWESTERN KENT
AND SOUTHERN NEW CASTLE COUNTIES...

THE WATERS FROM THE EARLIER HEAVY RAINS ARE RECEDING AND FLOOD WATERS
NO LONGER POSE A THREAT TO LIFE OR PROPERTY. THEREFORE...THE FLASH
FLOOD WARNING HAS BEEN CANCELLED.

LAT...LON 3950 7558 3946 7558 3942 7553 3937 7551
      3931 7543 3927 7576 3934 7577 3941 7577
      3942 7578 3948 7577

$$

FORECASTER: HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 3, 6:05 AM EDT	Areal Flood Advisory	PHI	New Castle	3 hr
Sep 3, 7:31 AM EDT	Flash Flood Warning	PHI	New Castle	2 hr
Sep 3, 8:23 AM EDT	Flash Flood Warning	PHI	New Castle	82 min
Sep 3, 1:42 PM EDT	Special Weather Statement	PHI	Sussex	93 min
Sep 3, 1:48 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	3 hr
Sep 3, 1:53 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	3 hr
Sep 3, 2:19 PM EDT	Areal Flood Advisory	PHI	Sussex	114 min
Sep 3, 2:39 PM EDT	Special Weather Statement	PHI	New Castle	66 min
Sep 3, 2:44 PM EDT	Areal Flood Advisory	PHI	New Castle	119 min
Sep 3, 3:00 PM EDT	Flash Flood Watch	PHI	New Castle	49 hr
Sep 3, 3:25 PM EDT	Tornado Warning	PHI	Kent	20 min
Sep 3, 3:58 PM EDT	Areal Flood Advisory	PHI	New Castle	3 hr

Nearby

Flash Flood Warnings in Delaware, 2012 Every flash flood warning in 2012

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.