Alert archive / New Jersey / Flash Flood Warnings in 2009

Flash Flood Warning 46, NWS Philadelphia/Mount Holly

August 22, 2009Caroline County, Queen Anne's County, Maryland; Kent County, New Castle County, Delaware; 4 counties in New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 22, 2009, 1:28 AM EDT for Caroline County, Queen Anne's County, Maryland; Kent County, New Castle County, Delaware; 4 counties in New Jersey. 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: Aug 22, 2009, 1:28 AM EDT (05:28 UTC)
Expired: Aug 22, 2009, 5:30 AM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Kent County, DE, New Castle County, DE, Caroline County, MD, Queen Anne's County, MD, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 51 km from the middle of the area, began a volume at 05:29 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.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 5.5 hours before the alert went out and 150 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: 2017 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 833 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KPHI 220528
FFWPHI
DEC001-003-MDC011-035-NJC007-011-015-033-220930-
/O.NEW.KPHI.FF.W.0046.090822T0528Z-090822T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
128 AM EDT SAT AUG 22 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN KENT COUNTY IN CENTRAL DELAWARE...
  THIS INCLUDES THE CITY OF DOVER...
  NORTHEASTERN CAROLINE COUNTY IN EASTERN MARYLAND...
  EXTREME NORTHEASTERN QUEEN ANNES COUNTY IN NORTHEAST MARYLAND...
  SOUTH CENTRAL NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...
  GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 530 AM EDT

* AT 121 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  SLOW MOVING THUNDERSTORMS WITH TORRENTIAL RAIN ACROSS PORTIONS OF 
  THE WARNED AREA. RAINFALL AMOUNTS OF TWO TO FOUR INCHES ARE 
  POSSIBLE. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO VOORHEES...
  SPRINGDALE...SICKLERVILLE...MONROE TOWNSHIP...GREENWICH...
  GREENTREE...DEPTFORD...ATCO...WOODSTOWN...WOODBURY HEIGHTS...
  WOODBURY...WILLIAMSTOWN...WESTVILLE...TURNERSVILLE...SHILOH...
  SEABROOK FARMS...PITMAN...OLIVET...MULLICA HILL...MAGNOLIA...
  LINDENWOLD...GLOUCESTER CITY...GLASSBORO...ELMER...CLAYTON...
  CHESILHURST...CHERRY HILL...BRIDGETON...BERLIN...BELLMAWR AND
  ALLOWAY

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.

&&

LAT...LON 3879 7589 3928 7573 3946 7557 3934 7547
      3932 7543 3935 7540 3943 7548 3947 7556
      3994 7509 3998 7503 3994 7502 3987 7493
      3979 7491 3978 7482 3931 7533 3935 7539
      3932 7543 3925 7540

$$

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 10:14 PM EDT	Areal Flood Advisory	PHI	Cecil, Kent	3 hr
Aug 21, 11:49 PM EDT	Areal Flood Advisory	PHI	Caroline, Queen Anne's, Talbot	116 min
Aug 22, 12:45 AM EDT	Areal Flood Warning	PHI	Caroline	17 hr
Aug 22, 2:19 AM EDT	Areal Flood Advisory	PHI	Caroline, Queen Anne's, Talbot	6 hr
Aug 22, 4:26 AM EDT	Areal Flood Advisory	PHI	Caroline	6 hr
Aug 22, 5:42 AM EDT	Areal Flood Advisory	PHI	Caroline, Queen Anne's	3 hr
Aug 22, 8:12 AM EDT	Areal Flood Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	3 hr
Aug 22, 3:53 PM EDT	Flash Flood Warning	PHI	Caroline, Talbot	6 hr
Aug 22, 4:46 PM EDT	Flash Flood Warning	PHI	Caroline	5 hr
Aug 22, 5:40 PM EDT	Areal Flood Warning	PHI	Caroline	14 hr
Aug 22, 6:02 PM EDT	Flash Flood Warning	PHI	Cecil, Kent, Queen Anne's	4 hr
Aug 22, 1:40 AM EDT	Areal Flood Advisory	PHI	Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Morris and 1 more	3 hr
Aug 22, 3:36 AM EDT	Flash Flood Warning	PHI	Somerset	4 hr
Aug 22, 9:01 AM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May, Cumberland	3 hr
Aug 22, 6:02 PM EDT	Flash Flood Warning	PHI	Mercer	4 hr
Aug 22, 6:21 PM EDT	Flash Flood Warning	PHI	Hunterdon, Warren	3 hr
Aug 22, 6:32 PM EDT	Flash Flood Warning	PHI	Camden, Gloucester	3 hr
Aug 22, 7:32 PM EDT	River Flood Warning	PHI	Mercer	19 hr

Nearby

Flash Flood Warnings in New Jersey, 2009 Flash Flood Warnings in Maryland, 2009 Flash Flood Warnings in Delaware, 2009 Every flash flood warning in 2009

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.