Alert archive / Delaware / Flash Flood Warnings in 2014

Flash Flood Warning 4, NWS Philadelphia/Mount Holly

June 10, 2014New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 10, 2014, 3:38 PM EDT for New Castle County, Delaware. It was in force for 112 min. 1 report 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: Jun 10, 2014, 3:38 PM EDT (19:38 UTC)
Expired: Jun 10, 2014, 5:30 PM EDT
In force: 112 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County New Castle County, DE

The radar

The Dover AFB radar (KDOX), 94 km from the middle of the area, began a volume at 19:40 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
Jun 10, 3:45 PM EDT	FLASH FLOOD	1 W Wilmington Airport, DE	FLOODING AT 1-95 AND CHURCHMANS ROAD. 1.60 INCHES OF RAIN IN LESS THAN AN HOUR.

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, 7.6 hours before the alert went out and 51 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: 566 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 712 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 63 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.

369 
WGUS51 KPHI 101938
FFWPHI
DEC003-102130-
/O.NEW.KPHI.FF.W.0004.140610T1938Z-140610T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
338 PM EDT TUE JUN 10 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  THIS INCLUDES THE CITIES OF...NEWARK...WILMINGTON...

* UNTIL 530 PM EDT

* AT 335 PM EDT...A SLOW MOVING CLUSTER OF SHOWERS AND THUNDERSTORMS 
  IS TRACKING ACROSS THE WARNED AREA. SURFACE OBSERVATIONS           
  INDICATE THAT NEARLY AN INCH OF RAIN HAS FALLEN WITHIN ABOUT 30        
  MINUTES. THIS AMOUNT OF RAINFALL IN A SHORT PERIOD OF TIME WILL    
  LEAD TO AREAS OF FLOODING.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WILMINGTON
  MANOR...NEWPORT...ELSMERE...STANTON AND PIKE CREEK

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.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 3981 7541 3976 7546 3972 7548 3971 7551
      3966 7554 3962 7560 3959 7559 3964 7557
      3963 7556 3958 7556 3957 7557 3956 7578
      3972 7579

$$

GORSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 10, 1:01 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	4 hr
Jun 10, 1:28 PM EDT	Flash Flood Warning	PHI	Kent, New Castle	4 hr
Jun 10, 2:39 PM EDT	Areal Flood Advisory	PHI	New Castle	3 hr
Jun 10, 4:44 PM EDT	Areal Flood Advisory	PHI	Sussex	3 hr
Jun 10, 4:46 PM EDT	River Flood Warning	PHI	New Castle	7 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.