Alert archive / Maryland / Flash Flood Warnings in 2014

Flash Flood Warning 49, NWS Philadelphia/Mount Holly

August 12, 2014New Castle County, Delaware; Cecil County, Kent County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 12, 2014, 7:02 PM EDT for New Castle County, Delaware; Cecil County, Kent County, Queen Anne's County, Maryland. It was in force for 4 hr. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 12, 2014, 7:02 PM EDT (23:02 UTC)
Expired: Aug 12, 2014, 11:00 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties New Castle County, DE, Cecil County, MD, Kent County, MD, Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 79 km from the middle of the area, began a volume at 23:04 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.

What was reported inside it

Time	Report	Where	Remark
Aug 12, 7:15 PM EDT	HEAVY RAIN 3.17	1 Se Betterton, MD
Aug 12, 7:30 PM EDT	FLASH FLOOD	1 Sse Rock Hall, MD	NUMEROUS ROADS CLOSED DUE TO FLOODING IN ROCK HALL
Aug 12, 7:30 PM EDT	FLASH FLOOD	Chestertown, MD	NUMEROUS ROADS CLOSED IN CHESTERTOWN
Aug 12, 9:30 PM EDT	HEAVY RAIN 2.68	Elkton, MD

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 11.0 hours before the alert went out and 21 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: 109 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 764 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

627 
WGUS51 KPHI 122302
FFWPHI
DEC003-MDC015-029-035-130300-
/O.NEW.KPHI.FF.W.0049.140812T2302Z-140813T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
702 PM EDT TUE AUG 12 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CECIL COUNTY IN NORTHEAST MARYLAND...
  THIS INCLUDES THE CITY OF NORTHEAST...
  KENT COUNTY IN NORTHEAST MARYLAND...
  NORTHEASTERN QUEEN ANNE'S COUNTY IN NORTHEAST MARYLAND...
  NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  THIS INCLUDES THE CITY OF NEWARK...

* UNTIL 1100 PM EDT

* AT 654 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAINFALL OCCURRING IN KENT COUNT MARYLAND.  THIS        
  RAINFALL WILL MOVE INTO CECIL COUNTY AND THEN INTO NEW CASTLE      
  COUNTY DELAWARE.  ADDITIONAL LIGHT TO MODERATE RAINFALL WILL THEN  
  OCCUR.  RADAR ESTIMATES OF AROUND 3 INCHES OF RAINFALL HAS         
  OCCURRED IN QUEEN ANNE'S COUNTY AND SIMILAR VALUES CAN BE EXPECTED 
  IN THOSE LOCATIONS THAT RECEIVE THE HEAVIEST RAINFALL.

THESE AMOUNTS COUPLED WITH RAINFALL FROM EARLIER TODAY WILL INCREASE 
THE THREAT OF FLASH FLOODING.    

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  MILLINGTON...WILMINGTON MANOR...NEWPORT...NEW CASTLE...DELAWARE
  CITY...CECILTON...BETTERTON...ZION...WARWICK...SASSAFRAS...PLEASANT
  HILL...NORTH EAST...MORGNEC...MASSEY...LOMBARD...KENNEDYVILLE...
  HOLLYWOOD BEACH...GLEN WESTOVER...FAIR HILL...ELKTON...CRUMPTON...
  CHERRY HILL...CHARLESTOWN...CAYOTS...BRANTWOOD...BOHEMIAS MILLS...
  BLAKE...BAY VIEW...BARKSDALE...APPLETON...ANDORA...STANTON...SAINT
  GEORGES...PORT PENN...MOUNT PLEASANT...MIDDLETOWN...GLASGOW...
  DELANEY CORNER AND BEAR

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

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 3938 7610 3938 7606 3944 7600 3946 7602
      3952 7599 3953 7601 3972 7597 3972 7551
      3962 7560 3959 7559 3964 7557 3954 7556
      3930 7570 3929 7576 3921 7576 3911 7625

$$

NIERENBERG

2 follow-up statements

341 
WGUS71 KPHI 130133
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
933 PM EDT TUE AUG 12 2014

DEC003-MDC029-035-130143-
/O.CAN.KPHI.FF.W.0049.000000T0000Z-140813T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NEW CASTLE DE-KENT MD-QUEEN ANNE'S MD-
933 PM EDT TUE AUG 12 2014

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHEASTERN QUEEN
ANNE'S...KENT AND NEW CASTLE COUNTIES...

ADDITIONAL WARNINGS REMAIN IN EFFECT FOR KENT AND QUEEN ANNE'S 
COUNTIES UNTIL 2 AM.

LAT...LON 3944 7600 3946 7602 3947 7600 3952 7599
      3953 7601 3972 7597 3972 7579 3938 7577
      3938 7582 3936 7589 3938 7596 3937 7598
      3938 7605

$$

MDC015-130300-
/O.CON.KPHI.FF.W.0049.000000T0000Z-140813T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CECIL MD-
933 PM EDT TUE AUG 12 2014

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT FOR
CECIL COUNTY...

AT 930 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING OVER THE WARNED
AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BOHEMIAS
MILLS...NORTHEAST...ZION...PLEASANT HILL...NORTH EAST...LOMBARD...
HOLLYWOOD BEACH...GLEN WESTOVER...FAIR HILL...ELKTON...CHERRY HILL...
CHARLESTOWN...CAYOTS...BRANTWOOD...BLAKE...BAY VIEW...BARKSDALE...
APPLETON AND ANDORA

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE 
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS 
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

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 3944 7600 3946 7602 3947 7600 3952 7599
      3953 7601 3972 7597 3972 7579 3938 7577
      3938 7582 3936 7589 3938 7596 3937 7598
      3938 7605

$$

388 
WGUS71 KPHI 130259
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1059 PM EDT TUE AUG 12 2014

MDC015-130309-
/O.EXP.KPHI.FF.W.0049.000000T0000Z-140813T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CECIL MD-
1059 PM EDT TUE AUG 12 2014

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1100 PM EDT FOR CECIL
COUNTY...

THE HEAVIEST RAIN HAS ENDED.

LAT...LON 3944 7600 3946 7602 3947 7600 3952 7599
      3953 7601 3972 7597 3972 7579 3938 7577
      3938 7582 3936 7589 3938 7596 3937 7598
      3938 7605

$$

JRK

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 3:32 PM EDT	Coastal Flood Advisory	PHI	Kent, New Castle, Sussex	13 hr
Aug 12, 3:47 PM EDT	Areal Flood Advisory	PHI	New Castle	4 hr
Aug 12, 5:29 PM EDT	Areal Flood Advisory	PHI	Queen Anne's, Talbot	4 hr
Aug 12, 5:59 PM EDT	Flash Flood Warning	PHI	Kent, Queen Anne's, Talbot	7 hr

Nearby

Flash Flood Warnings in Maryland, 2014 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.