Alert archive / Delaware / Flash Flood Warnings in 2016

Flash Flood Warning 36, NWS Philadelphia/Mount Holly

September 29, 2016Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 29, 2016, 2:13 AM EDT for Sussex County, Delaware. It was in force for 9 hr. 18 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: Sep 29, 2016, 2:13 AM EDT (06:13 UTC)
Expired: Sep 29, 2016, 11:15 AM EDT
In force: 9 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 24 km from the middle of the area, began a volume at 06:13 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

Time	Report	Where	Remark
Sep 29, 2:30 AM EDT	FLOOD	Oak Orchard, DE	MINOR STREET FLOODING REPORTED...TIME ESTIMATED FROM RADAR
Sep 29, 3:00 AM EDT	FLOOD	Milton, DE	MINOR STREET FLOODING REPORTED...TIME ESTIMATED FROM RADAR
Sep 29, 6:00 AM EDT	HEAVY RAIN 7.16	4 Sse Milton, DE	6.38 INCHES SINCE MIDNIGHT
Sep 29, 6:50 AM EDT	FLOOD	1 Ese Homestead Mobile, DE	LONG DRAIN ROAD CLOSED BETWEEN ROUTE 20 AND CROSS KEYS ROAD DUE TO FLOODING
Sep 29, 7:24 AM EDT	HEAVY RAIN 4.02	Jones Crossroads, DE
Sep 29, 7:24 AM EDT	HEAVY RAIN 4.1	Seaford, DE
Sep 29, 7:24 AM EDT	HEAVY RAIN 4.23	Gumboro, DE
Sep 29, 7:24 AM EDT	HEAVY RAIN 4.23	Laurel, DE
Sep 29, 7:24 AM EDT	HEAVY RAIN 4.39	Georgetown, DE
Sep 29, 7:24 AM EDT	HEAVY RAIN 5.69	Stockley, DE
Sep 29, 7:24 AM EDT	HEAVY RAIN 8.52	Harbeson, DE
Sep 29, 7:58 AM EDT	HEAVY RAIN 8.53	Harbeson, DE
Sep 29, 10:00 AM EDT	HEAVY RAIN 7.44	4 Sse Milton, DE
Sep 29, 10:20 AM EDT	HEAVY RAIN 5.75	Stockley, DE
Sep 29, 10:20 AM EDT	HEAVY RAIN 8.61	Harbeson, DE
Sep 29, 10:25 AM EDT	HEAVY RAIN 4.24	Gumboro, DE
Sep 29, 10:25 AM EDT	HEAVY RAIN 4.25	Laurel, DE
Sep 29, 10:25 AM EDT	HEAVY RAIN 4.45	Georgetown, 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 00:00Z, 6.2 hours before the alert went out and 76 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: 712 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 516 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.6

Open this sounding in Storm Lab

The text

As transmitted.

517 
WGUS51 KPHI 290613
FFWPHI
DEC005-291115-
/O.NEW.KPHI.FF.W.0036.160929T0613Z-160929T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
213 AM EDT THU SEP 29 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SUSSEX COUNTY IN SOUTHERN DELAWARE...

* UNTIL 715 AM EDT
    
* AT 212 AM EDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. THREE TO FOUR INCHES OF RAIN
  HAVE ALREADY FALLEN FOR THE SOUTHWESTERN PORTION OF THE COUNTY.
  THIS HEAVY RAIN WILL MOVE ACROSS THE SOUTHEASTERN PORTION OF THE
  COUNTY OVER THE NEXT HOUR OR TWO. BECAUSE THIS AMOUNT OF RAIN WILL
  FALL IN A SHORT PERIOD OF TIME...FLASH FLOODING IS LIKELY TO OCCUR.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  GEORGETOWN...SEAFORD...MILLSBORO...LAUREL...LEWES...MILTON...
  SELBYVILLE...DELMAR...DAGSBORO...MILLVILLE...HENLOPEN ACRES...
  SYCAMORE...GUMBORO...CAPE HENLOPEN STATE PARK...LONG NECK...
  OCEAN VIEW...BLADES...FRANKFORD...SOUTH BETHANY AND DEWEY BEACH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

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 3846 7569 3849 7570 3861 7571 3886 7519
      3881 7514 3881 7507 3876 7505 3845 7504
      3845 7535

$$

ROBERTSON

5 follow-up statements

469 
WGUS71 KPHI 290754
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
354 AM EDT THU SEP 29 2016

DEC005-291115-
/O.CON.KPHI.FF.W.0036.000000T0000Z-160929T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUSSEX DE-
354 AM EDT THU SEP 29 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 AM EDT FOR
SUSSEX COUNTY...

AT 350 AM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
HEAVY RAIN ACROSS THE WARNED AREA. AS MUCH AS THREE TO FOUR INCHES
OF RAIN HAS FALLEN ACROSS MUCH OF THE WARNED AREA DURING THE LAST
COUPLE OF HOURS. ADDITIONAL RAINFALL COULD DEVELOP AND MOVE ACROSS
THE AREA WHICH COULD CONTRIBUTE TO ADDITIONAL FLOODING.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
GEORGETOWN...SEAFORD...MILLSBORO...LAUREL...LEWES...MILTON...
SELBYVILLE...DELMAR...DAGSBORO...MILLVILLE...HENLOPEN ACRES...
SYCAMORE...GUMBORO...CAPE HENLOPEN STATE PARK...LONG NECK...
OCEAN VIEW...BLADES...FRANKFORD...SOUTH BETHANY AND DEWEY BEACH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

&&

LAT...LON 3846 7569 3849 7570 3861 7571 3886 7519
      3881 7514 3881 7507 3876 7505 3845 7504
      3845 7535

$$

ROBERTSON

143 
WGUS51 KPHI 291020
FFWPHI
DEC005-291515-
/O.EXT.KPHI.FF.W.0036.000000T0000Z-160929T1515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
620 AM EDT THU SEP 29 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  SUSSEX COUNTY IN SOUTHERN DELAWARE...

* UNTIL 1115 AM EDT

* AT 616 AM EDT...AS MUCH AS FIVE TO EIGHT INCHES OF RAIN HAS FALLEN
  OVER THE LAST SEVERAL HOURS. LOCAL LAW ENFORCEMENT REPORTED AREAS
  OF FLOODING ACROSS THE WARNED AREA DUE TO THE HEAVY RAINFALL.
  ADDITIONAL PERIODS OF MODERATE TO HEAVY RAINFALL COULD CONTINUE TO
  DEVELOP AND MOVE ACROSS THE AREA AND EXACERBATE THE FLOODING.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  GEORGETOWN...SEAFORD...MILLSBORO...LAUREL...LEWES...MILTON...
  SELBYVILLE...DELMAR...DAGSBORO...MILLVILLE...HENLOPEN ACRES...
  SYCAMORE...GUMBORO...CAPE HENLOPEN STATE PARK...LONG NECK...
  OCEAN VIEW...BLADES...FRANKFORD...SOUTH BETHANY AND DEWEY BEACH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

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 3846 7569 3849 7570 3861 7571 3886 7519
      3881 7514 3881 7507 3876 7505 3845 7504
      3845 7535

$$

ROBERTSON

608 
WGUS71 KPHI 291225
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
825 AM EDT THU SEP 29 2016

DEC005-291515-
/O.CON.KPHI.FF.W.0036.000000T0000Z-160929T1515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUSSEX DE-
825 AM EDT THU SEP 29 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 AM EDT FOR
SUSSEX COUNTY...

AT 820 AM EDT...SUSSEX COUNTY OFFICIALS CONTINUE TO REPORT FLOODING
ACROSS THE HARBESON AND MOUNT JOY AREAS. THESE AREAS RECEIVED HEAVY
RAINFALL OVERNIGHT. WHILE THE RAINFALL WAS LOCALIZED, AMOUNTS WERE
IN THE FIVE TO EIGHT INCH RANGE. IT WILL TAKE SOME TIME FOR THE
WATER TO RECEDE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

LAT...LON 3846 7569 3849 7570 3861 7571 3886 7519
      3881 7514 3881 7507 3876 7505 3845 7504
      3845 7535

$$

KRUZDLO

714 
WGUS71 KPHI 291325
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
925 AM EDT THU SEP 29 2016

DEC005-291515-
/O.CON.KPHI.FF.W.0036.000000T0000Z-160929T1515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUSSEX DE-
925 AM EDT THU SEP 29 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 AM EDT FOR
EASTERN SUSSEX COUNTY...

AT 923 AM EDT...FLOODING WAS REPORTED ACROSS THE HARBESON AND MOUNT
JOY AREAS. THESE AREAS RECEIVED HEAVY RAINFALL OVERNIGHT. WHILE THE
RAINFALL WAS LOCALIZED...AMOUNTS WERE IN THE FIVE TO EIGHT INCH
RANGE. IT WILL TAKE SOME TIME FOR THE WATER TO RECEDE.

THIS FLASH FLOOD WARNING WAS TRIMMED AND NOW ONLY INCLUDES EASTERN
SUSSEX COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

LAT...LON 3878 7535 3886 7520 3881 7514 3881 7507
      3877 7505 3845 7504 3846 7505 3845 7505
      3845 7535

$$

KRUZDLO

296 
WGUS71 KPHI 291507
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1107 AM EDT THU SEP 29 2016

DEC005-291516-
/O.EXP.KPHI.FF.W.0036.000000T0000Z-160929T1515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUSSEX DE-
1107 AM EDT THU SEP 29 2016

...THE FLASH FLOOD WARNING FOR EASTERN SUSSEX COUNTY WILL EXPIRE AT
1115 AM EDT...

FLOOD WATERS HAVE RECEDED FROM THIS MORNING AND ARE NO LONGER
EXPECTED TO POSE A THREAT TO LIFE OR PROPERTY.

BUT PLEASE CONTINUE TO MONITOR TODAY'S RAINFALL. ADDITIONAL RAIN IS
MOVING BACK ACROSS THE REGION. MORE ADVISORIES AND/OR WARNINGS MAY
BE ISSUED THIS AFTERNOON.

LAT...LON 3878 7535 3886 7520 3881 7514 3881 7507
      3877 7505 3845 7504 3846 7505 3845 7505
      3845 7535

$$

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 29, 12:21 AM EDT	Areal Flood Advisory	PHI	Kent, Sussex	8 hr
Sep 29, 1:38 AM EDT	Areal Flood Advisory	PHI	Sussex	4 hr
Sep 29, 2:18 AM EDT	Areal Flood Advisory	PHI	Kent, New Castle	4 hr
Sep 29, 4:28 AM EDT	Flash Flood Warning	PHI	Kent, Sussex	5 hr
Sep 29, 5:08 AM EDT	Coastal Flood Advisory	PHI	Kent, New Castle, Sussex	8 hr
Sep 29, 6:14 AM EDT	Areal Flood Advisory	PHI	Kent, New Castle	3 hr
Sep 29, 10:27 AM EDT	Coastal Flood Warning	PHI	Kent, Sussex	15 hr
Sep 29, 12:59 PM EDT	Areal Flood Advisory	PHI	Sussex	4 hr
Sep 29, 1:22 PM EDT	Coastal Flood Advisory	PHI	New Castle	12 hr
Sep 29, 2:32 PM EDT	Areal Flood Warning	PHI	Sussex	15 hr
Sep 29, 2:45 PM EDT	Wind Advisory	PHI	Sussex	20 hr
Sep 29, 7:27 PM EDT	Areal Flood Advisory	PHI	Kent	9 hr

Nearby

Flash Flood Warnings in Delaware, 2016 Every 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.