Alert archive / Delaware / Flash Flood Warnings in 2015

Flash Flood Warning 10, NWS Philadelphia/Mount Holly

June 1, 2015New Castle County, Delaware; Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 1, 2015, 6:29 PM EDT for New Castle County, Delaware; Cecil County, Maryland. It was in force for 3 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: Jun 1, 2015, 6:29 PM EDT (22:29 UTC)
Expired: Jun 1, 2015, 9:30 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties New Castle County, DE, Cecil County, MD

The radar

The Dover AFB radar (KDOX), 83 km from the middle of the area, began a volume at 22:32 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, 10.5 hours before the alert went out and 36 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: 355 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 779 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 102 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.

251 
WGUS51 KPHI 012229
FFWPHI
DEC003-MDC015-020130-
/O.NEW.KPHI.FF.W.0010.150601T2229Z-150602T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
629 PM EDT MON JUN 1 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  NORTHEASTERN CECIL COUNTY IN NORTHEASTERN MARYLAND...

* UNTIL 930 PM EDT
    
* AT 627 PM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING 
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN HAVE 
  ALREADY FALLEN. FLASH FLOODING IS EXPECTED.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  MIDDLETOWN...ELKTON...NORTH EAST...DELAWARE CITY...CHARLESTOWN...
  CAYOTS...MOUNT PLEASANT...BOHEMIAS MILLS...SAINT GEORGES...
  BRANTWOOD...WOODLAWN...PORT PENN...WARWICK...HOLLYWOOD BEACH...
  GLASGOW...BAY VIEW...BEAR...CHESAPEAKE CITY AND ODESSA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE AND 
PROPERTY.

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3965 7579 3962 7578 3960 7561 3958 7559
      3959 7557 3952 7557 3951 7556 3949 7559
      3946 7559 3939 7554 3941 7584 3965 7615

$$

KRUZDLO

1 follow-up statement

566 
WGUS71 KPHI 020124
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
924 PM EDT MON JUN 1 2015

DEC003-MDC015-020132-
/O.EXP.KPHI.FF.W.0010.000000T0000Z-150602T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NEW CASTLE DE-CECIL MD-
924 PM EDT MON JUN 1 2015

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN NEW CASTLE AND
NORTHEASTERN CECIL COUNTIES WILL EXPIRE AT 930 PM EDT...

THE HEAVY RAIN HAS ENDED...AND FLASH FLOODING IS NO LONGER EXPECTED 
TO POSE A THREAT. 

A FLOOD ADVISORY REMAINS IN PLACE FOR MINOR FLOODING. MAINLY LIGHT 
TO MODERATE RAIN WILL CONTINUE THROUGH THE EVENING.

LAT...LON 3965 7579 3962 7578 3960 7561 3958 7559
      3959 7557 3952 7557 3951 7556 3949 7559
      3946 7559 3939 7554 3941 7584 3965 7615

$$

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 1, 2:17 AM EDT	Special Weather Statement	PHI	New Castle	43 min
Jun 1, 3:13 AM EDT	Areal Flood Advisory	PHI	New Castle	3 hr
Jun 1, 4:20 AM EDT	Flash Flood Watch	PHI	Kent, New Castle, Sussex	26 hr
Jun 1, 4:32 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	43 min
Jun 1, 4:35 PM EDT	Flash Flood Warning	PHI	New Castle	3 hr
Jun 1, 5:27 PM EDT	Areal Flood Advisory	PHI	New Castle	3 hr
Jun 1, 6:11 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	6 hr
Jun 1, 6:53 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	37 min
Jun 1, 7:54 PM EDT	Special Weather Statement	PHI	Sussex	111 min
Jun 1, 5:35 PM EDT	Severe Thunderstorm Warning	PHI	Cecil, Kent, Queen Anne's	70 min
Jun 1, 5:56 PM EDT	Areal Flood Advisory	PHI	Cecil, Kent, Queen Anne's	6 hr

Nearby

Flash Flood Warnings in Delaware, 2015 Flash Flood Warnings in Maryland, 2015 Every flash flood warning in 2015

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.