Alert archive / Maryland / Flash Flood Warnings in 2013

Flash Flood Warning 13, NWS Philadelphia/Mount Holly

June 18, 20135 counties in Maryland; Kent County, New Castle County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 18, 2013, 2:29 PM EDT for 5 counties in Maryland; Kent County, New Castle County, Sussex County, Delaware. It was in force for 3 hr. 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 18, 2013, 2:29 PM EDT (18:29 UTC)
Expired
Jun 18, 2013, 5:30 PM EDT
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

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

The radar

The Dover AFB radar (KDOX), 57 km from the middle of the area, began a volume at 18:29 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

TimeReportWhereRemark
Jun 18, 4:30 PM EDTFLASH FLOODDover, DENUMEROUS REPORTS OF FLOODING IN KENT COUNTY

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, 6.5 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-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°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.

422 
WGUS51 KPHI 181829
FFWPHI
DEC001-003-005-MDC011-015-029-035-041-182130-
/O.NEW.KPHI.FF.W.0013.130618T1829Z-130618T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN NEW CASTLE COUNTY...
  SOUTHEASTERN CECIL COUNTY...
  KENT COUNTY...
  NORTHERN CAROLINE COUNTY...
  NORTHWESTERN SUSSEX COUNTY...
  QUEEN ANNE'S COUNTY...
  NORTHERN TALBOT COUNTY...

* UNTIL 530 PM EDT...

* AT 221 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN FROM AN AREA THUNDERSTORMS OVER EXTREME            
  NORTHWESTERN   SUSSEX...KENT...NORTHERN CAROLINE...NORTHERN        
  TALBOT...QUEEN   ANNE'S...SOUTHEASTERN CECIL AND SOUTHERN NEW      
  CASTLE COUNTIES.

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

ADDITIONAL RAINFALL AMOUNTS OF 2 TO 3 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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. NEVER ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR IN AN
AUTOMOBILE. TURN AROUND DON'T DROWN!

DRIVING INTO FLOOD WATERS COULD COST YOU YOUR LIFE...OR AT THE VERY
LEAST...THOUSANDS OF DOLLARS OF VEHICLE DAMAGE. NEARLY HALF OF ALL
FLASH FLOOD FATALITIES ARE AUTO RELATED. TURN AROUND...DON'T DROWN.

FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...
DIPS...OR LOW WATER CROSSINGS. TURN AROUND...DON'T DROWN! NEVER TRY
TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE
RISING WATER MOVE UP TO HIGHER GROUND.

&&

LAT...LON 3905 7630 3900 7621 3917 7629 3938 7611
      3940 7552 3926 7539 3906 7539 3893 7530
      3872 7620 3886 7627 3887 7626 3883 7624
      3881 7621 3892 7622 3894 7624 3890 7624
      3901 7634

$$

FORECASTER:PO

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 17, 8:16 PM EDTSpecial Weather StatementPHICecil119 min
Jun 17, 8:28 PM EDTAreal Flood AdvisoryPHICecil107 min
Jun 17, 9:37 PM EDTAreal Flood AdvisoryPHIKent, Queen Anne's6 hr
Jun 17, 9:51 PM EDTSpecial Weather StatementPHIKent114 min
Jun 17, 10:12 PM EDTFlash Flood WarningPHIKent4 hr
Jun 17, 10:40 PM EDTSpecial Weather StatementPHIQueen Anne's50 min
Jun 18, 12:14 PM EDTAreal Flood AdvisoryPHICecil3 hr
Jun 18, 1:32 PM EDTAreal Flood AdvisoryPHIKent3 hr
Jun 18, 4:23 PM EDTFlash Flood WarningPHICaroline4 hr
Jun 18, 2:10 PM EDTFlash Flood WarningPHINew Castle3 hr
Jun 18, 4:08 PM EDTRiver Flood WarningPHINew Castle2 hr
Jun 18, 4:20 PM EDTSpecial Weather StatementPHISussex70 min

Nearby

Flash Flood Warnings in Maryland, 2013Flash Flood Warnings in Delaware, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.