Alert archive / Delaware / Flash Flood Warnings in 2014

Flash Flood Warning 28, NWS Philadelphia/Mount Holly

July 10, 2014Kent County, Sussex County, Delaware; Caroline County, Maryland

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 10, 2014, 4:02 PM EDT for Kent County, 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: Jul 10, 2014, 4:02 PM EDT (20:02 UTC)
Expired: Jul 10, 2014, 8:00 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Kent County, DE, Sussex County, DE, Caroline County, MD

The radar

The Dover AFB radar (KDOX), 29 km from the middle of the area, began a volume at 20:03 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.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.0 hours before the alert went out and 77 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: 881 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 594 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -32 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: -0.2
Supercell composite: -1.9

Open this sounding in Storm Lab

The text

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

419 
WGUS51 KPHI 102002
FFWPHI
DEC001-005-MDC011-110000-
/O.NEW.KPHI.FF.W.0028.140710T2002Z-140711T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
402 PM EDT THU JUL 10 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN KENT COUNTY IN CENTRAL DELAWARE...
  CENTRAL CAROLINE COUNTY IN EASTERN MARYLAND...
  NORTHWESTERN SUSSEX COUNTY IN SOUTHERN DELAWARE...

* UNTIL 800 PM EDT

* AT 357 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HARRINGTON...RIDGELY...OAKLAND AND GREENSBORO

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.

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. NEVER TRY TO CROSS A FLOWING STREAM...
EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER
GROUND.

&&

LAT...LON 3877 7577 3877 7592 3881 7592 3881 7590
      3883 7592 3900 7592 3901 7544 3875 7543
      3875 7570

$$

HEAVENER

1 follow-up statement

480 
WGUS71 KPHI 102137
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
537 PM EDT THU JUL 10 2014

DEC001-005-MDC011-102148-
/O.CAN.KPHI.FF.W.0028.000000T0000Z-140711T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KENT DE-CAROLINE MD-SUSSEX DE-
537 PM EDT THU JUL 10 2014

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHWESTERN
SUSSEX...CENTRAL CAROLINE AND SOUTHERN KENT COUNTIES...

LAT...LON 3877 7577 3877 7592 3881 7592 3881 7590
      3883 7592 3900 7592 3901 7544 3875 7543
      3875 7570

$$

HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 1:32 PM EDT	Areal Flood Advisory	PHI	Kent	3 hr
Jul 10, 2:28 PM EDT	Areal Flood Advisory	PHI	Kent	3 hr
Jul 10, 3:00 PM EDT	Special Weather Statement	PHI	Kent	60 min
Jul 10, 3:14 PM EDT	Flash Flood Watch	PHI	Kent, New Castle, Sussex	9 hr
Jul 10, 3:39 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	3 hr
Jul 10, 4:36 PM EDT	Special Weather Statement	PHI	Sussex	54 min
Jul 10, 4:59 PM EDT	Areal Flood Advisory	PHI	Sussex	3 hr

Nearby

Flash Flood Warnings in Delaware, 2014 Flash Flood Warnings in Maryland, 2014 Every flash flood warning in 2014

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.