Alert archive / Delaware / Flash Flood Warnings in 2015

Flash Flood Warning 29, NWS Philadelphia/Mount Holly

July 6, 2015New Castle County, Delaware; Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 6, 2015, 6:05 PM EDT for New Castle County, Delaware; Cecil County, Maryland. 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: Jul 6, 2015, 6:05 PM EDT (22:05 UTC)
Expired: Jul 6, 2015, 10:00 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

The radar

The Dover AFB radar (KDOX), 89 km from the middle of the area, began a volume at 22:07 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, 10.1 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: 349 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 648 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 99 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

228 
WGUS51 KPHI 062205
FFWPHI
DEC003-MDC015-070200-
/O.NEW.KPHI.FF.W.0029.150706T2205Z-150707T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
605 PM EDT MON JUL 6 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WEST CENTRAL NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  EAST CENTRAL CECIL COUNTY IN NORTHEASTERN MARYLAND...

* UNTIL 1000 PM EDT
    
* AT 603 PM EDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN HAVE 
  ALREADY FALLEN WITH AN ADDITIONAL INCH OR MORE POSSIBLE. 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  BEAR...GLASGOW...BRANTWOOD AND BROOKSIDE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3962 7567 3951 7578 3957 7582 3966 7574

$$

ROBERTSON

1 follow-up statement

376 
WGUS71 KPHI 062326
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
726 PM EDT MON JUL 6 2015

DEC003-MDC015-062335-
/O.CAN.KPHI.FF.W.0029.000000T0000Z-150707T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NEW CASTLE DE-CECIL MD-
726 PM EDT MON JUL 6 2015

...THE FLASH FLOOD WARNING FOR WEST CENTRAL NEW CASTLE AND EAST
CENTRAL CECIL COUNTIES IS CANCELLED...

THE HEAVY RAIN THAT PROMPTED THE FLASH FLOOD WARNING HAS ENDED...AND 
FLOODING IS NO LONGER EXPECTED TO POSE A THREAT. ADDITIONAL SHOWERS 
AND THUNDERSTORMS ARE STILL POSSIBLE INTO THIS EVENING.

LAT...LON 3962 7567 3951 7578 3957 7582 3966 7574

$$

ROBERTSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 4:03 PM EDT	Special Weather Statement	PHI	Sussex	57 min
Jul 6, 4:54 PM EDT	Special Weather Statement	PHI	Sussex	36 min
Jul 6, 5:02 PM EDT	Special Weather Statement	PHI	Kent	28 min
Jul 6, 5:23 PM EDT	Areal Flood Advisory	PHI	New Castle	4 hr
Jul 6, 7:19 PM EDT	Areal Flood Advisory	PHI	New Castle	4 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.