Alert archive / Maryland / Flash Flood Warnings in 2016

Flash Flood Warning 20, NWS Philadelphia/Mount Holly

July 13, 2016Caroline County, Maryland; Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 13, 2016, 3:02 PM EDT for Caroline County, Maryland; Sussex County, Delaware. It was in force for 4 hr. 6 reports 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
Jul 13, 2016, 3:02 PM EDT (19:02 UTC)
Expired
Jul 13, 2016, 7:00 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), 28 km from the middle of the area, began a volume at 19:03 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
Jul 13, 3:20 PM EDTHEAVY RAIN 1.5Delmar, DEWITHIN THE LAST 90 MINUTES
Jul 13, 3:40 PM EDTFLOODSeaford, DECARS STRANDED IN WATER ON ROADWAYS
Jul 13, 3:40 PM EDTFLASH FLOODSeaford, DEMULTIPLE CARS STRANDED IN WATER ON ROADWAYS
Jul 13, 4:06 PM EDTHEAVY RAIN 2.274 E Delmar, DEWITHIN THE LAST 2 HOURS
Jul 13, 4:48 PM EDTFLASH FLOODSeaford, DERT. 20 CLOSED BETWEEN ATLANTA ROAD AND WOODPECKER ROAD
Jul 13, 4:49 PM EDTHEAVY RAIN 5.49Seaford, DE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 7.0 hours before the alert went out and 82 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, Wallops Is Stn, VA at 12:00Z on 2016-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 361 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, Wallops Is Stn, VA at 12:00Z on 2016-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.1939Sfc1 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
361 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
789 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
63 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

682 
WGUS51 KPHI 131902
FFWPHI
DEC005-MDC011-132300-
/O.NEW.KPHI.FF.W.0020.160713T1902Z-160713T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
302 PM EDT WED JUL 13 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN SUSSEX COUNTY IN SOUTHERN DELAWARE...
  SOUTHEASTERN CAROLINE COUNTY IN EASTERN MARYLAND...

* UNTIL 700 PM EDT
    
* AT 300 PM EDT...DOPPLER RADAR INDICATED A CLUSTER OF THUNDERSTORMS
  PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF
  RAIN HAVE ALREADY FALLEN. UP TO FOUR INCHES IS POSSIBLE. BECAUSE
  THIS AMOUNT OF RAIN WILL FALL IN A SHORT PERIOD OF TIME, FLASH
  FLOODING IS LIKELY. 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  SEAFORD...LAUREL...BRIDGEVILLE...SYCAMORE...AGNER...SMITHVILLE...
  BLADES AND BETHEL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. 

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

DRIVING INTO FLOOD WATERS COULD PUT YOUR LIFE AT RISK AND COST YOU
THOUSANDS OF DOLLARS IN VEHICLE REPAIRS. FLOOD WATERS MAY BE DEEPER
THAT YOU THINK.  TURN AROUND AND FIND AN ALTERNATE ROUTE.

&&

LAT...LON 3864 7571 3869 7577 3880 7583 3880 7556
      3846 7540 3846 7569

$$

KRUZDLO
2 follow-up statements
888 
WGUS71 KPHI 132002
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
402 PM EDT WED JUL 13 2016

DEC005-MDC011-132300-
/O.CON.KPHI.FF.W.0020.000000T0000Z-160713T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUSSEX DE-CAROLINE MD-
402 PM EDT WED JUL 13 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM EDT FOR
SOUTHWESTERN SUSSEX AND SOUTHEASTERN CAROLINE COUNTIES...

AT 400 PM EDT...HEAVY RAIN CONTINUES ACROSS PORTIONS OF THE WARNED
AREA. STRANDED CARS IN HIGH WATER HAVE BEEN REPORTED IN SEAFORD. 

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
SEAFORD...LAUREL...BRIDGEVILLE...SYCAMORE...AGNER...SMITHVILLE...
BLADES AND BETHEL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3864 7571 3869 7577 3880 7583 3880 7556
      3846 7540 3846 7569

$$

KRUZDLO
766 
WGUS71 KPHI 132252
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
652 PM EDT WED JUL 13 2016

DEC005-MDC011-132301-
/O.EXP.KPHI.FF.W.0020.000000T0000Z-160713T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUSSEX DE-CAROLINE MD-
652 PM EDT WED JUL 13 2016

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN SUSSEX AND SOUTHEASTERN
CAROLINE COUNTIES WILL EXPIRE AT 700 PM EDT...

FLOOD WATERS CONTINUE TO RECEDE. NO NEW FLOODING IS EXPECTED. PLEASE
CONTINUE TO HEED ANY ROAD CLOSURES.

LAT...LON 3864 7571 3869 7577 3880 7583 3880 7556
      3846 7540 3846 7569

$$

KRUZDLO

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 1:13 PM EDTAreal Flood AdvisoryPHICaroline, Queen Anne's, Talbot4 hr
Jul 13, 2:16 PM EDTAreal Flood AdvisoryPHICaroline4 hr
Jul 13, 2:34 PM EDTFlash Flood WarningPHICaroline, Talbot4 hr
Jul 13, 2:44 PM EDTHeat AdvisoryPHICaroline, Cecil, Kent, Queen Anne's, Talbot29 hr
Jul 13, 2:44 PM EDTExcessive Heat WarningPHINew Castle52 hr
Jul 13, 4:03 PM EDTSpecial Weather StatementPHISussex27 min
Jul 13, 4:39 PM EDTSpecial Weather StatementPHISussex51 min
Jul 13, 5:02 PM EDTSpecial Weather StatementPHISussex58 min

Nearby

Flash Flood Warnings in Maryland, 2016Flash Flood Warnings in Delaware, 2016Every flash flood warning in 2016

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.