Alert archive / Delaware / Flash Flood Warnings in 2013

Flash Flood Warning 14, NWS Philadelphia/Mount Holly

June 18, 2013Sussex County, Delaware; Caroline County, Maryland

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 18, 2013, 4:23 PM EDT for Sussex County, Delaware; Caroline 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
Jun 18, 2013, 4:23 PM EDT (20:23 UTC)
Expired
Jun 18, 2013, 8:15 PM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Sussex County, DE, Caroline County, MD

The radar

The Dover AFB radar (KDOX), 17 km from the middle of the area, began a volume at 20:25 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, 8.4 hours before the alert went out and 90 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-pSkew-T log-p diagram, Phillips Aaf/Abe, MD at 12:00Z on 2013-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 811 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 12:00Z on 2013-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
811 J/kg
Mixed-layer CIN
-63 J/kg
Mixed-layer LCL
833 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
89 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.3

Open this sounding in Storm Lab

The text

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

228 
WGUS51 KPHI 182023
FFWPHI
DEC005-MDC011-190015-
/O.NEW.KPHI.FF.W.0014.130618T2023Z-130619T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
423 PM EDT TUE JUN 18 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN CAROLINE COUNTY...
  SUSSEX COUNTY...

* UNTIL 815 PM EDT...

* AT 413 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN FROM A LINE OF SHOWERS AND THUNDERSTORMS ACROSS    
  THE AREA.  OVER TWO INCHES OF RAIN MAY HAVE FALLEN OVER THIS AREA  
  ALREADY...AND RAIN IS EXPECTED TO CONTINUE FOR THE NEXT HOUR OR    
  TWO. ROADWAY AND POOR DRAINAGE FLOODING CAN BE EXPECTED.


* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO GEORGETOWN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.  
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!

&&

LAT...LON 3846 7569 3864 7572 3870 7583 3867 7594
      3871 7600 3876 7598 3881 7590 3885 7593
      3890 7573 3883 7572 3884 7556 3891 7548
      3892 7541 3896 7539 3895 7533 3881 7518
      3880 7508 3845 7504

$$

FORECASTER:JJM
1 follow-up statement
599 
WGUS71 KPHI 182345
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
745 PM EDT TUE JUN 18 2013

DEC005-MDC011-182355-
/O.CAN.KPHI.FF.W.0014.000000T0000Z-130619T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CAROLINE MD-SUSSEX DE-
745 PM EDT TUE JUN 18 2013

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SUSSEX AND SOUTHERN
CAROLINE 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 3846 7569 3864 7572 3870 7583 3867 7594
      3871 7600 3876 7598 3881 7590 3885 7593
      3890 7573 3883 7572 3884 7556 3891 7548
      3892 7541 3896 7539 3895 7533 3881 7518
      3880 7508 3845 7504

$$

NIERENBERG

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 17, 8:16 PM EDTSpecial Weather StatementPHINew Castle119 min
Jun 17, 8:28 PM EDTAreal Flood AdvisoryPHINew Castle107 min
Jun 17, 9:51 PM EDTSpecial Weather StatementPHINew Castle114 min
Jun 18, 12:14 PM EDTAreal Flood AdvisoryPHINew Castle3 hr
Jun 18, 1:32 PM EDTAreal Flood AdvisoryPHIKent, New Castle3 hr
Jun 18, 2:10 PM EDTFlash Flood WarningPHINew Castle3 hr
Jun 18, 2:29 PM EDTFlash Flood WarningPHIKent, New Castle, Sussex3 hr
Jun 18, 4:08 PM EDTRiver Flood WarningPHINew Castle2 hr
Jun 18, 4:20 PM EDTSpecial Weather StatementPHISussex70 min
Jun 17, 9:37 PM EDTAreal Flood AdvisoryPHIKent, Queen Anne's6 hr
Jun 17, 10:12 PM EDTFlash Flood WarningPHIKent4 hr
Jun 17, 10:40 PM EDTSpecial Weather StatementPHIQueen Anne's50 min

Nearby

Flash Flood Warnings in Delaware, 2013Flash Flood Warnings in Maryland, 2013Every flash flood warning in 2013

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.